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3287 lines
126 KiB
3287 lines
126 KiB
// stb_truetype.h - v1.12 - public domain
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// authored from 2009-2016 by Sean Barrett / RAD Game Tools
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//
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// This library processes TrueType files:
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// parse files
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// extract glyph metrics
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// extract glyph shapes
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// render glyphs to one-channel bitmaps with antialiasing (box filter)
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//
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// Todo:
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// non-MS cmaps
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// crashproof on bad data
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// hinting? (no longer patented)
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// cleartype-style AA?
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// optimize: use simple memory allocator for intermediates
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// optimize: build edge-list directly from curves
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// optimize: rasterize directly from curves?
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//
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// ADDITIONAL CONTRIBUTORS
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//
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// Mikko Mononen: compound shape support, more cmap formats
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// Tor Andersson: kerning, subpixel rendering
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//
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// Misc other:
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// Ryan Gordon
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// Simon Glass
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//
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// Bug/warning reports/fixes:
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// "Zer" on mollyrocket (with fix)
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// Cass Everitt
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// stoiko (Haemimont Games)
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// Brian Hook
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// Walter van Niftrik
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// David Gow
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// David Given
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// Ivan-Assen Ivanov
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// Anthony Pesch
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// Johan Duparc
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// Hou Qiming
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// Fabian "ryg" Giesen
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// Martins Mozeiko
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// Cap Petschulat
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// Omar Cornut
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// github:aloucks
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// Peter LaValle
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// Sergey Popov
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// Giumo X. Clanjor
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// Higor Euripedes
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// Thomas Fields
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// Derek Vinyard
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//
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// VERSION HISTORY
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//
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// 1.12 (2016-10-25) suppress warnings about casting away const with -Wcast-qual
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// 1.11 (2016-04-02) fix unused-variable warning
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// 1.10 (2016-04-02) user-defined fabs(); rare memory leak; remove duplicate typedef
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// 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use allocation userdata properly
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// 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges
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// 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints;
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// variant PackFontRanges to pack and render in separate phases;
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// fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?);
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// fixed an assert() bug in the new rasterizer
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// replace assert() with STBTT_assert() in new rasterizer
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//
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// Full history can be found at the end of this file.
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//
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// LICENSE
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//
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// This software is dual-licensed to the public domain and under the following
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// license: you are granted a perpetual, irrevocable license to copy, modify,
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// publish, and distribute this file as you see fit.
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//
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// USAGE
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//
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// Include this file in whatever places neeed to refer to it. In ONE C/C++
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// file, write:
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// #define STB_TRUETYPE_IMPLEMENTATION
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// before the #include of this file. This expands out the actual
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// implementation into that C/C++ file.
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//
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// To make the implementation private to the file that generates the implementation,
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// #define STBTT_STATIC
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//
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// Simple 3D API (don't ship this, but it's fine for tools and quick start)
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// stbtt_BakeFontBitmap() -- bake a font to a bitmap for use as texture
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// stbtt_GetBakedQuad() -- compute quad to draw for a given char
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//
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// Improved 3D API (more shippable):
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// #include "stb_rect_pack.h" -- optional, but you really want it
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// stbtt_PackBegin()
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// stbtt_PackSetOversample() -- for improved quality on small fonts
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// stbtt_PackFontRanges() -- pack and renders
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// stbtt_PackEnd()
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// stbtt_GetPackedQuad()
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//
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// "Load" a font file from a memory buffer (you have to keep the buffer loaded)
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// stbtt_InitFont()
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// stbtt_GetFontOffsetForIndex() -- use for TTC font collections
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//
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// Render a unicode codepoint to a bitmap
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// stbtt_GetCodepointBitmap() -- allocates and returns a bitmap
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// stbtt_MakeCodepointBitmap() -- renders into bitmap you provide
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// stbtt_GetCodepointBitmapBox() -- how big the bitmap must be
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//
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// Character advance/positioning
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// stbtt_GetCodepointHMetrics()
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// stbtt_GetFontVMetrics()
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// stbtt_GetCodepointKernAdvance()
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//
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// Starting with version 1.06, the rasterizer was replaced with a new,
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// faster and generally-more-precise rasterizer. The new rasterizer more
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// accurately measures pixel coverage for anti-aliasing, except in the case
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// where multiple shapes overlap, in which case it overestimates the AA pixel
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// coverage. Thus, anti-aliasing of intersecting shapes may look wrong. If
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// this turns out to be a problem, you can re-enable the old rasterizer with
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// #define STBTT_RASTERIZER_VERSION 1
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// which will incur about a 15% speed hit.
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//
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// ADDITIONAL DOCUMENTATION
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//
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// Immediately after this block comment are a series of sample programs.
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//
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// After the sample programs is the "header file" section. This section
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// includes documentation for each API function.
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//
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// Some important concepts to understand to use this library:
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//
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// Codepoint
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// Characters are defined by unicode codepoints, e.g. 65 is
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// uppercase A, 231 is lowercase c with a cedilla, 0x7e30 is
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// the hiragana for "ma".
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//
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// Glyph
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// A visual character shape (every codepoint is rendered as
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// some glyph)
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//
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// Glyph index
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// A font-specific integer ID representing a glyph
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//
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// Baseline
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// Glyph shapes are defined relative to a baseline, which is the
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// bottom of uppercase characters. Characters extend both above
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// and below the baseline.
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//
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// Current Point
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// As you draw text to the screen, you keep track of a "current point"
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// which is the origin of each character. The current point's vertical
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// position is the baseline. Even "baked fonts" use this model.
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//
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// Vertical Font Metrics
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// The vertical qualities of the font, used to vertically position
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// and space the characters. See docs for stbtt_GetFontVMetrics.
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//
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// Font Size in Pixels or Points
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// The preferred interface for specifying font sizes in stb_truetype
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// is to specify how tall the font's vertical extent should be in pixels.
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// If that sounds good enough, skip the next paragraph.
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//
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// Most font APIs instead use "points", which are a common typographic
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// measurement for describing font size, defined as 72 points per inch.
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// stb_truetype provides a point API for compatibility. However, true
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// "per inch" conventions don't make much sense on computer displays
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// since they different monitors have different number of pixels per
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// inch. For example, Windows traditionally uses a convention that
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// there are 96 pixels per inch, thus making 'inch' measurements have
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// nothing to do with inches, and thus effectively defining a point to
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// be 1.333 pixels. Additionally, the TrueType font data provides
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// an explicit scale factor to scale a given font's glyphs to points,
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// but the author has observed that this scale factor is often wrong
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// for non-commercial fonts, thus making fonts scaled in points
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// according to the TrueType spec incoherently sized in practice.
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//
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// ADVANCED USAGE
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//
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// Quality:
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//
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// - Use the functions with Subpixel at the end to allow your characters
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// to have subpixel positioning. Since the font is anti-aliased, not
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// hinted, this is very import for quality. (This is not possible with
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// baked fonts.)
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//
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// - Kerning is now supported, and if you're supporting subpixel rendering
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// then kerning is worth using to give your text a polished look.
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//
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// Performance:
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//
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// - Convert Unicode codepoints to glyph indexes and operate on the glyphs;
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// if you don't do this, stb_truetype is forced to do the conversion on
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// every call.
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//
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// - There are a lot of memory allocations. We should modify it to take
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// a temp buffer and allocate from the temp buffer (without freeing),
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// should help performance a lot.
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//
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// NOTES
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//
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// The system uses the raw data found in the .ttf file without changing it
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// and without building auxiliary data structures. This is a bit inefficient
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// on little-endian systems (the data is big-endian), but assuming you're
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// caching the bitmaps or glyph shapes this shouldn't be a big deal.
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//
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// It appears to be very hard to programmatically determine what font a
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// given file is in a general way. I provide an API for this, but I don't
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// recommend it.
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//
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//
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// SOURCE STATISTICS (based on v0.6c, 2050 LOC)
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//
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// Documentation & header file 520 LOC \___ 660 LOC documentation
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// Sample code 140 LOC /
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// Truetype parsing 620 LOC ---- 620 LOC TrueType
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// Software rasterization 240 LOC \ .
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// Curve tesselation 120 LOC \__ 550 LOC Bitmap creation
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// Bitmap management 100 LOC /
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// Baked bitmap interface 70 LOC /
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// Font name matching & access 150 LOC ---- 150
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// C runtime library abstraction 60 LOC ---- 60
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//
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//
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// PERFORMANCE MEASUREMENTS FOR 1.06:
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//
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// 32-bit 64-bit
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// Previous release: 8.83 s 7.68 s
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// Pool allocations: 7.72 s 6.34 s
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// Inline sort : 6.54 s 5.65 s
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// New rasterizer : 5.63 s 5.00 s
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//////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////
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////
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//// SAMPLE PROGRAMS
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////
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//
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// Incomplete text-in-3d-api example, which draws quads properly aligned to be lossless
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//
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#if 0
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#define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation
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#include "stb_truetype.h"
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unsigned char ttf_buffer[1<<20];
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unsigned char temp_bitmap[512*512];
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stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs
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GLuint ftex;
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void my_stbtt_initfont(void)
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{
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fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb"));
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stbtt_BakeFontBitmap(ttf_buffer,0, 32.0, temp_bitmap,512,512, 32,96, cdata); // no guarantee this fits!
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// can free ttf_buffer at this point
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glGenTextures(1, &ftex);
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glBindTexture(GL_TEXTURE_2D, ftex);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512,512, 0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap);
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// can free temp_bitmap at this point
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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}
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void my_stbtt_print(float x, float y, char *text)
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{
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// assume orthographic projection with units = screen pixels, origin at top left
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glEnable(GL_TEXTURE_2D);
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glBindTexture(GL_TEXTURE_2D, ftex);
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glBegin(GL_QUADS);
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while (*text) {
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if (*text >= 32 && *text < 128) {
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stbtt_aligned_quad q;
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stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl & d3d10+,0=d3d9
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glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y0);
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glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y0);
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glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y1);
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glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y1);
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}
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++text;
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}
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glEnd();
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}
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#endif
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//
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//
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//////////////////////////////////////////////////////////////////////////////
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//
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// Complete program (this compiles): get a single bitmap, print as ASCII art
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//
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#if 0
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#include <stdio.h>
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#define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation
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#include "stb_truetype.h"
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char ttf_buffer[1<<25];
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int main(int argc, char **argv)
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{
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stbtt_fontinfo font;
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unsigned char *bitmap;
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int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 'a'), s = (argc > 2 ? atoi(argv[2]) : 20);
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fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/arialbd.ttf", "rb"));
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stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0));
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bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, s), c, &w, &h, 0,0);
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for (j=0; j < h; ++j) {
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for (i=0; i < w; ++i)
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putchar(" .:ioVM@"[bitmap[j*w+i]>>5]);
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putchar('\n');
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}
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return 0;
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}
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#endif
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//
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// Output:
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//
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// .ii.
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// @@@@@@.
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// V@Mio@@o
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// :i. V@V
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// :oM@@M
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// :@@@MM@M
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// @@o o@M
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// :@@. M@M
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// @@@o@@@@
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// :M@@V:@@.
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//
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//////////////////////////////////////////////////////////////////////////////
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//
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// Complete program: print "Hello World!" banner, with bugs
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//
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#if 0
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char buffer[24<<20];
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unsigned char screen[20][79];
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int main(int arg, char **argv)
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{
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stbtt_fontinfo font;
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int i,j,ascent,baseline,ch=0;
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float scale, xpos=2; // leave a little padding in case the character extends left
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char *text = "Heljo World!"; // intentionally misspelled to show 'lj' brokenness
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fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb"));
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stbtt_InitFont(&font, buffer, 0);
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scale = stbtt_ScaleForPixelHeight(&font, 15);
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stbtt_GetFontVMetrics(&font, &ascent,0,0);
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baseline = (int) (ascent*scale);
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while (text[ch]) {
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int advance,lsb,x0,y0,x1,y1;
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float x_shift = xpos - (float) floor(xpos);
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stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb);
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stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1);
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stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]);
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// note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong
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// because this API is really for baking character bitmaps into textures. if you want to render
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// a sequence of characters, you really need to render each bitmap to a temp buffer, then
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// "alpha blend" that into the working buffer
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xpos += (advance * scale);
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if (text[ch+1])
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xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]);
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++ch;
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}
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for (j=0; j < 20; ++j) {
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for (i=0; i < 78; ++i)
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putchar(" .:ioVM@"[screen[j][i]>>5]);
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putchar('\n');
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}
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return 0;
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}
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#endif
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//////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////
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////
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//// INTEGRATION WITH YOUR CODEBASE
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////
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//// The following sections allow you to supply alternate definitions
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//// of C library functions used by stb_truetype.
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#ifdef STB_TRUETYPE_IMPLEMENTATION
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// #define your own (u)stbtt_int8/16/32 before including to override this
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#ifndef stbtt_uint8
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typedef unsigned char stbtt_uint8;
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typedef signed char stbtt_int8;
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typedef unsigned short stbtt_uint16;
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typedef signed short stbtt_int16;
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typedef unsigned int stbtt_uint32;
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typedef signed int stbtt_int32;
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#endif
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typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1];
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typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1];
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// #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
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#ifndef STBTT_ifloor
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#include <math.h>
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#define STBTT_ifloor(x) ((int) floor(x))
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#define STBTT_iceil(x) ((int) ceil(x))
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#endif
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#ifndef STBTT_sqrt
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#include <math.h>
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#define STBTT_sqrt(x) sqrt(x)
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#endif
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#ifndef STBTT_fabs
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#include <math.h>
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#define STBTT_fabs(x) fabs(x)
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#endif
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// #define your own functions "STBTT_malloc" / "STBTT_free" to avoid malloc.h
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#ifndef STBTT_malloc
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#include <stdlib.h>
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#define STBTT_malloc(x,u) ((void)(u),malloc(x))
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#define STBTT_free(x,u) ((void)(u),free(x))
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#endif
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#ifndef STBTT_assert
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#include <assert.h>
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#define STBTT_assert(x) assert(x)
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#endif
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#ifndef STBTT_strlen
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#include <string.h>
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#define STBTT_strlen(x) strlen(x)
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#endif
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#ifndef STBTT_memcpy
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#include <memory.h>
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#define STBTT_memcpy memcpy
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#define STBTT_memset memset
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#endif
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#endif
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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////
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//// INTERFACE
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////
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////
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#ifndef __STB_INCLUDE_STB_TRUETYPE_H__
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#define __STB_INCLUDE_STB_TRUETYPE_H__
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#ifdef STBTT_STATIC
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#define STBTT_DEF static
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#else
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#define STBTT_DEF extern
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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//////////////////////////////////////////////////////////////////////////////
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//
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// TEXTURE BAKING API
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//
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// If you use this API, you only have to call two functions ever.
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//
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typedef struct
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{
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unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
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float xoff,yoff,xadvance;
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} stbtt_bakedchar;
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STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset, // font location (use offset=0 for plain .ttf)
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float pixel_height, // height of font in pixels
|
|
unsigned char *pixels, int pw, int ph, // bitmap to be filled in
|
|
int first_char, int num_chars, // characters to bake
|
|
stbtt_bakedchar *chardata); // you allocate this, it's num_chars long
|
|
// if return is positive, the first unused row of the bitmap
|
|
// if return is negative, returns the negative of the number of characters that fit
|
|
// if return is 0, no characters fit and no rows were used
|
|
// This uses a very crappy packing.
|
|
|
|
typedef struct
|
|
{
|
|
float x0,y0,s0,t0; // top-left
|
|
float x1,y1,s1,t1; // bottom-right
|
|
} stbtt_aligned_quad;
|
|
|
|
STBTT_DEF void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph, // same data as above
|
|
int char_index, // character to display
|
|
float *xpos, float *ypos, // pointers to current position in screen pixel space
|
|
stbtt_aligned_quad *q, // output: quad to draw
|
|
int opengl_fillrule); // true if opengl fill rule; false if DX9 or earlier
|
|
// Call GetBakedQuad with char_index = 'character - first_char', and it
|
|
// creates the quad you need to draw and advances the current position.
|
|
//
|
|
// The coordinate system used assumes y increases downwards.
|
|
//
|
|
// Characters will extend both above and below the current position;
|
|
// see discussion of "BASELINE" above.
|
|
//
|
|
// It's inefficient; you might want to c&p it and optimize it.
|
|
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// NEW TEXTURE BAKING API
|
|
//
|
|
// This provides options for packing multiple fonts into one atlas, not
|
|
// perfectly but better than nothing.
|
|
|
|
typedef struct
|
|
{
|
|
unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
|
|
float xoff,yoff,xadvance;
|
|
float xoff2,yoff2;
|
|
} stbtt_packedchar;
|
|
|
|
typedef struct stbtt_pack_context stbtt_pack_context;
|
|
typedef struct stbtt_fontinfo stbtt_fontinfo;
|
|
#ifndef STB_RECT_PACK_VERSION
|
|
typedef struct stbrp_rect stbrp_rect;
|
|
#endif
|
|
|
|
STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int width, int height, int stride_in_bytes, int padding, void *alloc_context);
|
|
// Initializes a packing context stored in the passed-in stbtt_pack_context.
|
|
// Future calls using this context will pack characters into the bitmap passed
|
|
// in here: a 1-channel bitmap that is weight x height. stride_in_bytes is
|
|
// the distance from one row to the next (or 0 to mean they are packed tightly
|
|
// together). "padding" is the amount of padding to leave between each
|
|
// character (normally you want '1' for bitmaps you'll use as textures with
|
|
// bilinear filtering).
|
|
//
|
|
// Returns 0 on failure, 1 on success.
|
|
|
|
STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc);
|
|
// Cleans up the packing context and frees all memory.
|
|
|
|
#define STBTT_POINT_SIZE(x) (-(x))
|
|
|
|
STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, float font_size,
|
|
int first_unicode_char_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range);
|
|
// Creates character bitmaps from the font_index'th font found in fontdata (use
|
|
// font_index=0 if you don't know what that is). It creates num_chars_in_range
|
|
// bitmaps for characters with unicode values starting at first_unicode_char_in_range
|
|
// and increasing. Data for how to render them is stored in chardata_for_range;
|
|
// pass these to stbtt_GetPackedQuad to get back renderable quads.
|
|
//
|
|
// font_size is the full height of the character from ascender to descender,
|
|
// as computed by stbtt_ScaleForPixelHeight. To use a point size as computed
|
|
// by stbtt_ScaleForMappingEmToPixels, wrap the point size in STBTT_POINT_SIZE()
|
|
// and pass that result as 'font_size':
|
|
// ..., 20 , ... // font max minus min y is 20 pixels tall
|
|
// ..., STBTT_POINT_SIZE(20), ... // 'M' is 20 pixels tall
|
|
|
|
typedef struct
|
|
{
|
|
float font_size;
|
|
int first_unicode_codepoint_in_range; // if non-zero, then the chars are continuous, and this is the first codepoint
|
|
int *array_of_unicode_codepoints; // if non-zero, then this is an array of unicode codepoints
|
|
int num_chars;
|
|
stbtt_packedchar *chardata_for_range; // output
|
|
unsigned char h_oversample, v_oversample; // don't set these, they're used internally
|
|
} stbtt_pack_range;
|
|
|
|
STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges);
|
|
// Creates character bitmaps from multiple ranges of characters stored in
|
|
// ranges. This will usually create a better-packed bitmap than multiple
|
|
// calls to stbtt_PackFontRange. Note that you can call this multiple
|
|
// times within a single PackBegin/PackEnd.
|
|
|
|
STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample);
|
|
// Oversampling a font increases the quality by allowing higher-quality subpixel
|
|
// positioning, and is especially valuable at smaller text sizes.
|
|
//
|
|
// This function sets the amount of oversampling for all following calls to
|
|
// stbtt_PackFontRange(s) or stbtt_PackFontRangesGatherRects for a given
|
|
// pack context. The default (no oversampling) is achieved by h_oversample=1
|
|
// and v_oversample=1. The total number of pixels required is
|
|
// h_oversample*v_oversample larger than the default; for example, 2x2
|
|
// oversampling requires 4x the storage of 1x1. For best results, render
|
|
// oversampled textures with bilinear filtering. Look at the readme in
|
|
// stb/tests/oversample for information about oversampled fonts
|
|
//
|
|
// To use with PackFontRangesGather etc., you must set it before calls
|
|
// call to PackFontRangesGatherRects.
|
|
|
|
STBTT_DEF void stbtt_GetPackedQuad(stbtt_packedchar *chardata, int pw, int ph, // same data as above
|
|
int char_index, // character to display
|
|
float *xpos, float *ypos, // pointers to current position in screen pixel space
|
|
stbtt_aligned_quad *q, // output: quad to draw
|
|
int align_to_integer);
|
|
|
|
STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects);
|
|
STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects);
|
|
STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects);
|
|
// Calling these functions in sequence is roughly equivalent to calling
|
|
// stbtt_PackFontRanges(). If you more control over the packing of multiple
|
|
// fonts, or if you want to pack custom data into a font texture, take a look
|
|
// at the source to of stbtt_PackFontRanges() and create a custom version
|
|
// using these functions, e.g. call GatherRects multiple times,
|
|
// building up a single array of rects, then call PackRects once,
|
|
// then call RenderIntoRects repeatedly. This may result in a
|
|
// better packing than calling PackFontRanges multiple times
|
|
// (or it may not).
|
|
|
|
// this is an opaque structure that you shouldn't mess with which holds
|
|
// all the context needed from PackBegin to PackEnd.
|
|
struct stbtt_pack_context {
|
|
void *user_allocator_context;
|
|
void *pack_info;
|
|
int width;
|
|
int height;
|
|
int stride_in_bytes;
|
|
int padding;
|
|
unsigned int h_oversample, v_oversample;
|
|
unsigned char *pixels;
|
|
void *nodes;
|
|
};
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// FONT LOADING
|
|
//
|
|
//
|
|
|
|
STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index);
|
|
// Each .ttf/.ttc file may have more than one font. Each font has a sequential
|
|
// index number starting from 0. Call this function to get the font offset for
|
|
// a given index; it returns -1 if the index is out of range. A regular .ttf
|
|
// file will only define one font and it always be at offset 0, so it will
|
|
// return '0' for index 0, and -1 for all other indices. You can just skip
|
|
// this step if you know it's that kind of font.
|
|
|
|
|
|
// The following structure is defined publically so you can declare one on
|
|
// the stack or as a global or etc, but you should treat it as opaque.
|
|
struct stbtt_fontinfo
|
|
{
|
|
void * userdata;
|
|
unsigned char * data; // pointer to .ttf file
|
|
int fontstart; // offset of start of font
|
|
|
|
int numGlyphs; // number of glyphs, needed for range checking
|
|
|
|
int loca,head,glyf,hhea,hmtx,kern; // table locations as offset from start of .ttf
|
|
int index_map; // a cmap mapping for our chosen character encoding
|
|
int indexToLocFormat; // format needed to map from glyph index to glyph
|
|
};
|
|
|
|
STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset);
|
|
// Given an offset into the file that defines a font, this function builds
|
|
// the necessary cached info for the rest of the system. You must allocate
|
|
// the stbtt_fontinfo yourself, and stbtt_InitFont will fill it out. You don't
|
|
// need to do anything special to free it, because the contents are pure
|
|
// value data with no additional data structures. Returns 0 on failure.
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// CHARACTER TO GLYPH-INDEX CONVERSIOn
|
|
|
|
STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint);
|
|
// If you're going to perform multiple operations on the same character
|
|
// and you want a speed-up, call this function with the character you're
|
|
// going to process, then use glyph-based functions instead of the
|
|
// codepoint-based functions.
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// CHARACTER PROPERTIES
|
|
//
|
|
|
|
STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float pixels);
|
|
// computes a scale factor to produce a font whose "height" is 'pixels' tall.
|
|
// Height is measured as the distance from the highest ascender to the lowest
|
|
// descender; in other words, it's equivalent to calling stbtt_GetFontVMetrics
|
|
// and computing:
|
|
// scale = pixels / (ascent - descent)
|
|
// so if you prefer to measure height by the ascent only, use a similar calculation.
|
|
|
|
STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels);
|
|
// computes a scale factor to produce a font whose EM size is mapped to
|
|
// 'pixels' tall. This is probably what traditional APIs compute, but
|
|
// I'm not positive.
|
|
|
|
STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap);
|
|
// ascent is the coordinate above the baseline the font extends; descent
|
|
// is the coordinate below the baseline the font extends (i.e. it is typically negative)
|
|
// lineGap is the spacing between one row's descent and the next row's ascent...
|
|
// so you should advance the vertical position by "*ascent - *descent + *lineGap"
|
|
// these are expressed in unscaled coordinates, so you must multiply by
|
|
// the scale factor for a given size
|
|
|
|
STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1);
|
|
// the bounding box around all possible characters
|
|
|
|
STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing);
|
|
// leftSideBearing is the offset from the current horizontal position to the left edge of the character
|
|
// advanceWidth is the offset from the current horizontal position to the next horizontal position
|
|
// these are expressed in unscaled coordinates
|
|
|
|
STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2);
|
|
// an additional amount to add to the 'advance' value between ch1 and ch2
|
|
|
|
STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1);
|
|
// Gets the bounding box of the visible part of the glyph, in unscaled coordinates
|
|
|
|
STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing);
|
|
STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2);
|
|
STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1);
|
|
// as above, but takes one or more glyph indices for greater efficiency
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// GLYPH SHAPES (you probably don't need these, but they have to go before
|
|
// the bitmaps for C declaration-order reasons)
|
|
//
|
|
|
|
#ifndef STBTT_vmove // you can predefine these to use different values (but why?)
|
|
enum {
|
|
STBTT_vmove=1,
|
|
STBTT_vline,
|
|
STBTT_vcurve
|
|
};
|
|
#endif
|
|
|
|
#ifndef stbtt_vertex // you can predefine this to use different values
|
|
// (we share this with other code at RAD)
|
|
#define stbtt_vertex_type short // can't use stbtt_int16 because that's not visible in the header file
|
|
typedef struct
|
|
{
|
|
stbtt_vertex_type x,y,cx,cy;
|
|
unsigned char type,padding;
|
|
} stbtt_vertex;
|
|
#endif
|
|
|
|
STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index);
|
|
// returns non-zero if nothing is drawn for this glyph
|
|
|
|
STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices);
|
|
STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **vertices);
|
|
// returns # of vertices and fills *vertices with the pointer to them
|
|
// these are expressed in "unscaled" coordinates
|
|
//
|
|
// The shape is a series of countours. Each one starts with
|
|
// a STBTT_moveto, then consists of a series of mixed
|
|
// STBTT_lineto and STBTT_curveto segments. A lineto
|
|
// draws a line from previous endpoint to its x,y; a curveto
|
|
// draws a quadratic bezier from previous endpoint to
|
|
// its x,y, using cx,cy as the bezier control point.
|
|
|
|
STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices);
|
|
// frees the data allocated above
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// BITMAP RENDERING
|
|
//
|
|
|
|
STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata);
|
|
// frees the bitmap allocated below
|
|
|
|
STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
|
|
// allocates a large-enough single-channel 8bpp bitmap and renders the
|
|
// specified character/glyph at the specified scale into it, with
|
|
// antialiasing. 0 is no coverage (transparent), 255 is fully covered (opaque).
|
|
// *width & *height are filled out with the width & height of the bitmap,
|
|
// which is stored left-to-right, top-to-bottom.
|
|
//
|
|
// xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap
|
|
|
|
STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
|
|
// the same as stbtt_GetCodepoitnBitmap, but you can specify a subpixel
|
|
// shift for the character
|
|
|
|
STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint);
|
|
// the same as stbtt_GetCodepointBitmap, but you pass in storage for the bitmap
|
|
// in the form of 'output', with row spacing of 'out_stride' bytes. the bitmap
|
|
// is clipped to out_w/out_h bytes. Call stbtt_GetCodepointBitmapBox to get the
|
|
// width and height and positioning info for it first.
|
|
|
|
STBTT_DEF void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint);
|
|
// same as stbtt_MakeCodepointBitmap, but you can specify a subpixel
|
|
// shift for the character
|
|
|
|
STBTT_DEF void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
|
|
// get the bbox of the bitmap centered around the glyph origin; so the
|
|
// bitmap width is ix1-ix0, height is iy1-iy0, and location to place
|
|
// the bitmap top left is (leftSideBearing*scale,iy0).
|
|
// (Note that the bitmap uses y-increases-down, but the shape uses
|
|
// y-increases-up, so CodepointBitmapBox and CodepointBox are inverted.)
|
|
|
|
STBTT_DEF void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);
|
|
// same as stbtt_GetCodepointBitmapBox, but you can specify a subpixel
|
|
// shift for the character
|
|
|
|
// the following functions are equivalent to the above functions, but operate
|
|
// on glyph indices instead of Unicode codepoints (for efficiency)
|
|
STBTT_DEF unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff);
|
|
STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff);
|
|
STBTT_DEF void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph);
|
|
STBTT_DEF void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph);
|
|
STBTT_DEF void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
|
|
STBTT_DEF void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);
|
|
|
|
|
|
// @TODO: don't expose this structure
|
|
typedef struct
|
|
{
|
|
int w,h,stride;
|
|
unsigned char *pixels;
|
|
} stbtt__bitmap;
|
|
|
|
// rasterize a shape with quadratic beziers into a bitmap
|
|
STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, // 1-channel bitmap to draw into
|
|
float flatness_in_pixels, // allowable error of curve in pixels
|
|
stbtt_vertex *vertices, // array of vertices defining shape
|
|
int num_verts, // number of vertices in above array
|
|
float scale_x, float scale_y, // scale applied to input vertices
|
|
float shift_x, float shift_y, // translation applied to input vertices
|
|
int x_off, int y_off, // another translation applied to input
|
|
int invert, // if non-zero, vertically flip shape
|
|
void *userdata); // context for to STBTT_MALLOC
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Finding the right font...
|
|
//
|
|
// You should really just solve this offline, keep your own tables
|
|
// of what font is what, and don't try to get it out of the .ttf file.
|
|
// That's because getting it out of the .ttf file is really hard, because
|
|
// the names in the file can appear in many possible encodings, in many
|
|
// possible languages, and e.g. if you need a case-insensitive comparison,
|
|
// the details of that depend on the encoding & language in a complex way
|
|
// (actually underspecified in truetype, but also gigantic).
|
|
//
|
|
// But you can use the provided functions in two possible ways:
|
|
// stbtt_FindMatchingFont() will use *case-sensitive* comparisons on
|
|
// unicode-encoded names to try to find the font you want;
|
|
// you can run this before calling stbtt_InitFont()
|
|
//
|
|
// stbtt_GetFontNameString() lets you get any of the various strings
|
|
// from the file yourself and do your own comparisons on them.
|
|
// You have to have called stbtt_InitFont() first.
|
|
|
|
|
|
STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags);
|
|
// returns the offset (not index) of the font that matches, or -1 if none
|
|
// if you use STBTT_MACSTYLE_DONTCARE, use a font name like "Arial Bold".
|
|
// if you use any other flag, use a font name like "Arial"; this checks
|
|
// the 'macStyle' header field; i don't know if fonts set this consistently
|
|
#define STBTT_MACSTYLE_DONTCARE 0
|
|
#define STBTT_MACSTYLE_BOLD 1
|
|
#define STBTT_MACSTYLE_ITALIC 2
|
|
#define STBTT_MACSTYLE_UNDERSCORE 4
|
|
#define STBTT_MACSTYLE_NONE 8 // <= not same as 0, this makes us check the bitfield is 0
|
|
|
|
STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2);
|
|
// returns 1/0 whether the first string interpreted as utf8 is identical to
|
|
// the second string interpreted as big-endian utf16... useful for strings from next func
|
|
|
|
STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID);
|
|
// returns the string (which may be big-endian double byte, e.g. for unicode)
|
|
// and puts the length in bytes in *length.
|
|
//
|
|
// some of the values for the IDs are below; for more see the truetype spec:
|
|
// http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html
|
|
// http://www.microsoft.com/typography/otspec/name.htm
|
|
|
|
enum { // platformID
|
|
STBTT_PLATFORM_ID_UNICODE =0,
|
|
STBTT_PLATFORM_ID_MAC =1,
|
|
STBTT_PLATFORM_ID_ISO =2,
|
|
STBTT_PLATFORM_ID_MICROSOFT =3
|
|
};
|
|
|
|
enum { // encodingID for STBTT_PLATFORM_ID_UNICODE
|
|
STBTT_UNICODE_EID_UNICODE_1_0 =0,
|
|
STBTT_UNICODE_EID_UNICODE_1_1 =1,
|
|
STBTT_UNICODE_EID_ISO_10646 =2,
|
|
STBTT_UNICODE_EID_UNICODE_2_0_BMP=3,
|
|
STBTT_UNICODE_EID_UNICODE_2_0_FULL=4
|
|
};
|
|
|
|
enum { // encodingID for STBTT_PLATFORM_ID_MICROSOFT
|
|
STBTT_MS_EID_SYMBOL =0,
|
|
STBTT_MS_EID_UNICODE_BMP =1,
|
|
STBTT_MS_EID_SHIFTJIS =2,
|
|
STBTT_MS_EID_UNICODE_FULL =10
|
|
};
|
|
|
|
enum { // encodingID for STBTT_PLATFORM_ID_MAC; same as Script Manager codes
|
|
STBTT_MAC_EID_ROMAN =0, STBTT_MAC_EID_ARABIC =4,
|
|
STBTT_MAC_EID_JAPANESE =1, STBTT_MAC_EID_HEBREW =5,
|
|
STBTT_MAC_EID_CHINESE_TRAD =2, STBTT_MAC_EID_GREEK =6,
|
|
STBTT_MAC_EID_KOREAN =3, STBTT_MAC_EID_RUSSIAN =7
|
|
};
|
|
|
|
enum { // languageID for STBTT_PLATFORM_ID_MICROSOFT; same as LCID...
|
|
// problematic because there are e.g. 16 english LCIDs and 16 arabic LCIDs
|
|
STBTT_MS_LANG_ENGLISH =0x0409, STBTT_MS_LANG_ITALIAN =0x0410,
|
|
STBTT_MS_LANG_CHINESE =0x0804, STBTT_MS_LANG_JAPANESE =0x0411,
|
|
STBTT_MS_LANG_DUTCH =0x0413, STBTT_MS_LANG_KOREAN =0x0412,
|
|
STBTT_MS_LANG_FRENCH =0x040c, STBTT_MS_LANG_RUSSIAN =0x0419,
|
|
STBTT_MS_LANG_GERMAN =0x0407, STBTT_MS_LANG_SPANISH =0x0409,
|
|
STBTT_MS_LANG_HEBREW =0x040d, STBTT_MS_LANG_SWEDISH =0x041D
|
|
};
|
|
|
|
enum { // languageID for STBTT_PLATFORM_ID_MAC
|
|
STBTT_MAC_LANG_ENGLISH =0 , STBTT_MAC_LANG_JAPANESE =11,
|
|
STBTT_MAC_LANG_ARABIC =12, STBTT_MAC_LANG_KOREAN =23,
|
|
STBTT_MAC_LANG_DUTCH =4 , STBTT_MAC_LANG_RUSSIAN =32,
|
|
STBTT_MAC_LANG_FRENCH =1 , STBTT_MAC_LANG_SPANISH =6 ,
|
|
STBTT_MAC_LANG_GERMAN =2 , STBTT_MAC_LANG_SWEDISH =5 ,
|
|
STBTT_MAC_LANG_HEBREW =10, STBTT_MAC_LANG_CHINESE_SIMPLIFIED =33,
|
|
STBTT_MAC_LANG_ITALIAN =3 , STBTT_MAC_LANG_CHINESE_TRAD =19
|
|
};
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif // __STB_INCLUDE_STB_TRUETYPE_H__
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
////
|
|
//// IMPLEMENTATION
|
|
////
|
|
////
|
|
|
|
#ifdef STB_TRUETYPE_IMPLEMENTATION
|
|
|
|
#ifndef STBTT_MAX_OVERSAMPLE
|
|
#define STBTT_MAX_OVERSAMPLE 8
|
|
#endif
|
|
|
|
#if STBTT_MAX_OVERSAMPLE > 255
|
|
#error "STBTT_MAX_OVERSAMPLE cannot be > 255"
|
|
#endif
|
|
|
|
typedef int stbtt__test_oversample_pow2[(STBTT_MAX_OVERSAMPLE & (STBTT_MAX_OVERSAMPLE-1)) == 0 ? 1 : -1];
|
|
|
|
#ifndef STBTT_RASTERIZER_VERSION
|
|
#define STBTT_RASTERIZER_VERSION 2
|
|
#endif
|
|
|
|
#ifdef _MSC_VER
|
|
#define STBTT__NOTUSED(v) (void)(v)
|
|
#else
|
|
#define STBTT__NOTUSED(v) (void)sizeof(v)
|
|
#endif
|
|
|
|
//////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// accessors to parse data from file
|
|
//
|
|
|
|
// on platforms that don't allow misaligned reads, if we want to allow
|
|
// truetype fonts that aren't padded to alignment, define ALLOW_UNALIGNED_TRUETYPE
|
|
|
|
#define ttBYTE(p) (* (stbtt_uint8 *) (p))
|
|
#define ttCHAR(p) (* (stbtt_int8 *) (p))
|
|
#define ttFixed(p) ttLONG(p)
|
|
|
|
static stbtt_uint16 ttUSHORT(stbtt_uint8 *p) { return p[0]*256 + p[1]; }
|
|
static stbtt_int16 ttSHORT(stbtt_uint8 *p) { return p[0]*256 + p[1]; }
|
|
static stbtt_uint32 ttULONG(stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
|
|
static stbtt_int32 ttLONG(stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
|
|
|
|
#define stbtt_tag4(p,c0,c1,c2,c3) ((p)[0] == (c0) && (p)[1] == (c1) && (p)[2] == (c2) && (p)[3] == (c3))
|
|
#define stbtt_tag(p,str) stbtt_tag4(p,str[0],str[1],str[2],str[3])
|
|
|
|
static int stbtt__isfont(stbtt_uint8 *font)
|
|
{
|
|
// check the version number
|
|
if (stbtt_tag4(font, '1',0,0,0)) return 1; // TrueType 1
|
|
if (stbtt_tag(font, "typ1")) return 1; // TrueType with type 1 font -- we don't support this!
|
|
if (stbtt_tag(font, "OTTO")) return 1; // OpenType with CFF
|
|
if (stbtt_tag4(font, 0,1,0,0)) return 1; // OpenType 1.0
|
|
return 0;
|
|
}
|
|
|
|
// @OPTIMIZE: binary search
|
|
static stbtt_uint32 stbtt__find_table(stbtt_uint8 *data, stbtt_uint32 fontstart, const char *tag)
|
|
{
|
|
stbtt_int32 num_tables = ttUSHORT(data+fontstart+4);
|
|
stbtt_uint32 tabledir = fontstart + 12;
|
|
stbtt_int32 i;
|
|
for (i=0; i < num_tables; ++i) {
|
|
stbtt_uint32 loc = tabledir + 16*i;
|
|
if (stbtt_tag(data+loc+0, tag))
|
|
return ttULONG(data+loc+8);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int stbtt_GetFontOffsetForIndex_internal(unsigned char *font_collection, int index)
|
|
{
|
|
// if it's just a font, there's only one valid index
|
|
if (stbtt__isfont(font_collection))
|
|
return index == 0 ? 0 : -1;
|
|
|
|
// check if it's a TTC
|
|
if (stbtt_tag(font_collection, "ttcf")) {
|
|
// version 1?
|
|
if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) {
|
|
stbtt_int32 n = ttLONG(font_collection+8);
|
|
if (index >= n)
|
|
return -1;
|
|
return ttULONG(font_collection+12+index*4);
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, int fontstart)
|
|
{
|
|
stbtt_uint32 cmap, t;
|
|
stbtt_int32 i,numTables;
|
|
|
|
info->data = data;
|
|
info->fontstart = fontstart;
|
|
|
|
cmap = stbtt__find_table(data, fontstart, "cmap"); // required
|
|
info->loca = stbtt__find_table(data, fontstart, "loca"); // required
|
|
info->head = stbtt__find_table(data, fontstart, "head"); // required
|
|
info->glyf = stbtt__find_table(data, fontstart, "glyf"); // required
|
|
info->hhea = stbtt__find_table(data, fontstart, "hhea"); // required
|
|
info->hmtx = stbtt__find_table(data, fontstart, "hmtx"); // required
|
|
info->kern = stbtt__find_table(data, fontstart, "kern"); // not required
|
|
if (!cmap || !info->loca || !info->head || !info->glyf || !info->hhea || !info->hmtx)
|
|
return 0;
|
|
|
|
t = stbtt__find_table(data, fontstart, "maxp");
|
|
if (t)
|
|
info->numGlyphs = ttUSHORT(data+t+4);
|
|
else
|
|
info->numGlyphs = 0xffff;
|
|
|
|
// find a cmap encoding table we understand *now* to avoid searching
|
|
// later. (todo: could make this installable)
|
|
// the same regardless of glyph.
|
|
numTables = ttUSHORT(data + cmap + 2);
|
|
info->index_map = 0;
|
|
for (i=0; i < numTables; ++i) {
|
|
stbtt_uint32 encoding_record = cmap + 4 + 8 * i;
|
|
// find an encoding we understand:
|
|
switch(ttUSHORT(data+encoding_record)) {
|
|
case STBTT_PLATFORM_ID_MICROSOFT:
|
|
switch (ttUSHORT(data+encoding_record+2)) {
|
|
case STBTT_MS_EID_UNICODE_BMP:
|
|
case STBTT_MS_EID_UNICODE_FULL:
|
|
// MS/Unicode
|
|
info->index_map = cmap + ttULONG(data+encoding_record+4);
|
|
break;
|
|
}
|
|
break;
|
|
case STBTT_PLATFORM_ID_UNICODE:
|
|
// Mac/iOS has these
|
|
// all the encodingIDs are unicode, so we don't bother to check it
|
|
info->index_map = cmap + ttULONG(data+encoding_record+4);
|
|
break;
|
|
}
|
|
}
|
|
if (info->index_map == 0)
|
|
return 0;
|
|
|
|
info->indexToLocFormat = ttUSHORT(data+info->head + 50);
|
|
return 1;
|
|
}
|
|
|
|
STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint)
|
|
{
|
|
stbtt_uint8 *data = info->data;
|
|
stbtt_uint32 index_map = info->index_map;
|
|
|
|
stbtt_uint16 format = ttUSHORT(data + index_map + 0);
|
|
if (format == 0) { // apple byte encoding
|
|
stbtt_int32 bytes = ttUSHORT(data + index_map + 2);
|
|
if (unicode_codepoint < bytes-6)
|
|
return ttBYTE(data + index_map + 6 + unicode_codepoint);
|
|
return 0;
|
|
} else if (format == 6) {
|
|
stbtt_uint32 first = ttUSHORT(data + index_map + 6);
|
|
stbtt_uint32 count = ttUSHORT(data + index_map + 8);
|
|
if ((stbtt_uint32) unicode_codepoint >= first && (stbtt_uint32) unicode_codepoint < first+count)
|
|
return ttUSHORT(data + index_map + 10 + (unicode_codepoint - first)*2);
|
|
return 0;
|
|
} else if (format == 2) {
|
|
STBTT_assert(0); // @TODO: high-byte mapping for japanese/chinese/korean
|
|
return 0;
|
|
} else if (format == 4) { // standard mapping for windows fonts: binary search collection of ranges
|
|
stbtt_uint16 segcount = ttUSHORT(data+index_map+6) >> 1;
|
|
stbtt_uint16 searchRange = ttUSHORT(data+index_map+8) >> 1;
|
|
stbtt_uint16 entrySelector = ttUSHORT(data+index_map+10);
|
|
stbtt_uint16 rangeShift = ttUSHORT(data+index_map+12) >> 1;
|
|
|
|
// do a binary search of the segments
|
|
stbtt_uint32 endCount = index_map + 14;
|
|
stbtt_uint32 search = endCount;
|
|
|
|
if (unicode_codepoint > 0xffff)
|
|
return 0;
|
|
|
|
// they lie from endCount .. endCount + segCount
|
|
// but searchRange is the nearest power of two, so...
|
|
if (unicode_codepoint >= ttUSHORT(data + search + rangeShift*2))
|
|
search += rangeShift*2;
|
|
|
|
// now decrement to bias correctly to find smallest
|
|
search -= 2;
|
|
while (entrySelector) {
|
|
stbtt_uint16 end;
|
|
searchRange >>= 1;
|
|
end = ttUSHORT(data + search + searchRange*2);
|
|
if (unicode_codepoint > end)
|
|
search += searchRange*2;
|
|
--entrySelector;
|
|
}
|
|
search += 2;
|
|
|
|
{
|
|
stbtt_uint16 offset, start;
|
|
stbtt_uint16 item = (stbtt_uint16) ((search - endCount) >> 1);
|
|
|
|
STBTT_assert(unicode_codepoint <= ttUSHORT(data + endCount + 2*item));
|
|
start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item);
|
|
if (unicode_codepoint < start)
|
|
return 0;
|
|
|
|
offset = ttUSHORT(data + index_map + 14 + segcount*6 + 2 + 2*item);
|
|
if (offset == 0)
|
|
return (stbtt_uint16) (unicode_codepoint + ttSHORT(data + index_map + 14 + segcount*4 + 2 + 2*item));
|
|
|
|
return ttUSHORT(data + offset + (unicode_codepoint-start)*2 + index_map + 14 + segcount*6 + 2 + 2*item);
|
|
}
|
|
} else if (format == 12 || format == 13) {
|
|
stbtt_uint32 ngroups = ttULONG(data+index_map+12);
|
|
stbtt_int32 low,high;
|
|
low = 0; high = (stbtt_int32)ngroups;
|
|
// Binary search the right group.
|
|
while (low < high) {
|
|
stbtt_int32 mid = low + ((high-low) >> 1); // rounds down, so low <= mid < high
|
|
stbtt_uint32 start_char = ttULONG(data+index_map+16+mid*12);
|
|
stbtt_uint32 end_char = ttULONG(data+index_map+16+mid*12+4);
|
|
if ((stbtt_uint32) unicode_codepoint < start_char)
|
|
high = mid;
|
|
else if ((stbtt_uint32) unicode_codepoint > end_char)
|
|
low = mid+1;
|
|
else {
|
|
stbtt_uint32 start_glyph = ttULONG(data+index_map+16+mid*12+8);
|
|
if (format == 12)
|
|
return start_glyph + unicode_codepoint-start_char;
|
|
else // format == 13
|
|
return start_glyph;
|
|
}
|
|
}
|
|
return 0; // not found
|
|
}
|
|
// @TODO
|
|
STBTT_assert(0);
|
|
return 0;
|
|
}
|
|
|
|
STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices)
|
|
{
|
|
return stbtt_GetGlyphShape(info, stbtt_FindGlyphIndex(info, unicode_codepoint), vertices);
|
|
}
|
|
|
|
static void stbtt_setvertex(stbtt_vertex *v, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy)
|
|
{
|
|
v->type = type;
|
|
v->x = (stbtt_int16) x;
|
|
v->y = (stbtt_int16) y;
|
|
v->cx = (stbtt_int16) cx;
|
|
v->cy = (stbtt_int16) cy;
|
|
}
|
|
|
|
static int stbtt__GetGlyfOffset(const stbtt_fontinfo *info, int glyph_index)
|
|
{
|
|
int g1,g2;
|
|
|
|
if (glyph_index >= info->numGlyphs) return -1; // glyph index out of range
|
|
if (info->indexToLocFormat >= 2) return -1; // unknown index->glyph map format
|
|
|
|
if (info->indexToLocFormat == 0) {
|
|
g1 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2) * 2;
|
|
g2 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2 + 2) * 2;
|
|
} else {
|
|
g1 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4);
|
|
g2 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4 + 4);
|
|
}
|
|
|
|
return g1==g2 ? -1 : g1; // if length is 0, return -1
|
|
}
|
|
|
|
STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1)
|
|
{
|
|
int g = stbtt__GetGlyfOffset(info, glyph_index);
|
|
if (g < 0) return 0;
|
|
|
|
if (x0) *x0 = ttSHORT(info->data + g + 2);
|
|
if (y0) *y0 = ttSHORT(info->data + g + 4);
|
|
if (x1) *x1 = ttSHORT(info->data + g + 6);
|
|
if (y1) *y1 = ttSHORT(info->data + g + 8);
|
|
return 1;
|
|
}
|
|
|
|
STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1)
|
|
{
|
|
return stbtt_GetGlyphBox(info, stbtt_FindGlyphIndex(info,codepoint), x0,y0,x1,y1);
|
|
}
|
|
|
|
STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index)
|
|
{
|
|
stbtt_int16 numberOfContours;
|
|
int g = stbtt__GetGlyfOffset(info, glyph_index);
|
|
if (g < 0) return 1;
|
|
numberOfContours = ttSHORT(info->data + g);
|
|
return numberOfContours == 0;
|
|
}
|
|
|
|
static int stbtt__close_shape(stbtt_vertex *vertices, int num_vertices, int was_off, int start_off,
|
|
stbtt_int32 sx, stbtt_int32 sy, stbtt_int32 scx, stbtt_int32 scy, stbtt_int32 cx, stbtt_int32 cy)
|
|
{
|
|
if (start_off) {
|
|
if (was_off)
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+scx)>>1, (cy+scy)>>1, cx,cy);
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, sx,sy,scx,scy);
|
|
} else {
|
|
if (was_off)
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve,sx,sy,cx,cy);
|
|
else
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vline,sx,sy,0,0);
|
|
}
|
|
return num_vertices;
|
|
}
|
|
|
|
STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
|
|
{
|
|
stbtt_int16 numberOfContours;
|
|
stbtt_uint8 *endPtsOfContours;
|
|
stbtt_uint8 *data = info->data;
|
|
stbtt_vertex *vertices=0;
|
|
int num_vertices=0;
|
|
int g = stbtt__GetGlyfOffset(info, glyph_index);
|
|
|
|
*pvertices = NULL;
|
|
|
|
if (g < 0) return 0;
|
|
|
|
numberOfContours = ttSHORT(data + g);
|
|
|
|
if (numberOfContours > 0) {
|
|
stbtt_uint8 flags=0,flagcount;
|
|
stbtt_int32 ins, i,j=0,m,n, next_move, was_off=0, off, start_off=0;
|
|
stbtt_int32 x,y,cx,cy,sx,sy, scx,scy;
|
|
stbtt_uint8 *points;
|
|
endPtsOfContours = (data + g + 10);
|
|
ins = ttUSHORT(data + g + 10 + numberOfContours * 2);
|
|
points = data + g + 10 + numberOfContours * 2 + 2 + ins;
|
|
|
|
n = 1+ttUSHORT(endPtsOfContours + numberOfContours*2-2);
|
|
|
|
m = n + 2*numberOfContours; // a loose bound on how many vertices we might need
|
|
vertices = (stbtt_vertex *) STBTT_malloc(m * sizeof(vertices[0]), info->userdata);
|
|
if (vertices == 0)
|
|
return 0;
|
|
|
|
next_move = 0;
|
|
flagcount=0;
|
|
|
|
// in first pass, we load uninterpreted data into the allocated array
|
|
// above, shifted to the end of the array so we won't overwrite it when
|
|
// we create our final data starting from the front
|
|
|
|
off = m - n; // starting offset for uninterpreted data, regardless of how m ends up being calculated
|
|
|
|
// first load flags
|
|
|
|
for (i=0; i < n; ++i) {
|
|
if (flagcount == 0) {
|
|
flags = *points++;
|
|
if (flags & 8)
|
|
flagcount = *points++;
|
|
} else
|
|
--flagcount;
|
|
vertices[off+i].type = flags;
|
|
}
|
|
|
|
// now load x coordinates
|
|
x=0;
|
|
for (i=0; i < n; ++i) {
|
|
flags = vertices[off+i].type;
|
|
if (flags & 2) {
|
|
stbtt_int16 dx = *points++;
|
|
x += (flags & 16) ? dx : -dx; // ???
|
|
} else {
|
|
if (!(flags & 16)) {
|
|
x = x + (stbtt_int16) (points[0]*256 + points[1]);
|
|
points += 2;
|
|
}
|
|
}
|
|
vertices[off+i].x = (stbtt_int16) x;
|
|
}
|
|
|
|
// now load y coordinates
|
|
y=0;
|
|
for (i=0; i < n; ++i) {
|
|
flags = vertices[off+i].type;
|
|
if (flags & 4) {
|
|
stbtt_int16 dy = *points++;
|
|
y += (flags & 32) ? dy : -dy; // ???
|
|
} else {
|
|
if (!(flags & 32)) {
|
|
y = y + (stbtt_int16) (points[0]*256 + points[1]);
|
|
points += 2;
|
|
}
|
|
}
|
|
vertices[off+i].y = (stbtt_int16) y;
|
|
}
|
|
|
|
// now convert them to our format
|
|
num_vertices=0;
|
|
sx = sy = cx = cy = scx = scy = 0;
|
|
for (i=0; i < n; ++i) {
|
|
flags = vertices[off+i].type;
|
|
x = (stbtt_int16) vertices[off+i].x;
|
|
y = (stbtt_int16) vertices[off+i].y;
|
|
|
|
if (next_move == i) {
|
|
if (i != 0)
|
|
num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
|
|
|
|
// now start the new one
|
|
start_off = !(flags & 1);
|
|
if (start_off) {
|
|
// if we start off with an off-curve point, then when we need to find a point on the curve
|
|
// where we can start, and we need to save some state for when we wraparound.
|
|
scx = x;
|
|
scy = y;
|
|
if (!(vertices[off+i+1].type & 1)) {
|
|
// next point is also a curve point, so interpolate an on-point curve
|
|
sx = (x + (stbtt_int32) vertices[off+i+1].x) >> 1;
|
|
sy = (y + (stbtt_int32) vertices[off+i+1].y) >> 1;
|
|
} else {
|
|
// otherwise just use the next point as our start point
|
|
sx = (stbtt_int32) vertices[off+i+1].x;
|
|
sy = (stbtt_int32) vertices[off+i+1].y;
|
|
++i; // we're using point i+1 as the starting point, so skip it
|
|
}
|
|
} else {
|
|
sx = x;
|
|
sy = y;
|
|
}
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vmove,sx,sy,0,0);
|
|
was_off = 0;
|
|
next_move = 1 + ttUSHORT(endPtsOfContours+j*2);
|
|
++j;
|
|
} else {
|
|
if (!(flags & 1)) { // if it's a curve
|
|
if (was_off) // two off-curve control points in a row means interpolate an on-curve midpoint
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+x)>>1, (cy+y)>>1, cx, cy);
|
|
cx = x;
|
|
cy = y;
|
|
was_off = 1;
|
|
} else {
|
|
if (was_off)
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, x,y, cx, cy);
|
|
else
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vline, x,y,0,0);
|
|
was_off = 0;
|
|
}
|
|
}
|
|
}
|
|
num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
|
|
} else if (numberOfContours == -1) {
|
|
// Compound shapes.
|
|
int more = 1;
|
|
stbtt_uint8 *comp = data + g + 10;
|
|
num_vertices = 0;
|
|
vertices = 0;
|
|
while (more) {
|
|
stbtt_uint16 flags, gidx;
|
|
int comp_num_verts = 0, i;
|
|
stbtt_vertex *comp_verts = 0, *tmp = 0;
|
|
float mtx[6] = {1,0,0,1,0,0}, m, n;
|
|
|
|
flags = ttSHORT(comp); comp+=2;
|
|
gidx = ttSHORT(comp); comp+=2;
|
|
|
|
if (flags & 2) { // XY values
|
|
if (flags & 1) { // shorts
|
|
mtx[4] = ttSHORT(comp); comp+=2;
|
|
mtx[5] = ttSHORT(comp); comp+=2;
|
|
} else {
|
|
mtx[4] = ttCHAR(comp); comp+=1;
|
|
mtx[5] = ttCHAR(comp); comp+=1;
|
|
}
|
|
}
|
|
else {
|
|
// @TODO handle matching point
|
|
STBTT_assert(0);
|
|
}
|
|
if (flags & (1<<3)) { // WE_HAVE_A_SCALE
|
|
mtx[0] = mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
|
|
mtx[1] = mtx[2] = 0;
|
|
} else if (flags & (1<<6)) { // WE_HAVE_AN_X_AND_YSCALE
|
|
mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
|
|
mtx[1] = mtx[2] = 0;
|
|
mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
|
|
} else if (flags & (1<<7)) { // WE_HAVE_A_TWO_BY_TWO
|
|
mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
|
|
mtx[1] = ttSHORT(comp)/16384.0f; comp+=2;
|
|
mtx[2] = ttSHORT(comp)/16384.0f; comp+=2;
|
|
mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
|
|
}
|
|
|
|
// Find transformation scales.
|
|
m = (float) STBTT_sqrt(mtx[0]*mtx[0] + mtx[1]*mtx[1]);
|
|
n = (float) STBTT_sqrt(mtx[2]*mtx[2] + mtx[3]*mtx[3]);
|
|
|
|
// Get indexed glyph.
|
|
comp_num_verts = stbtt_GetGlyphShape(info, gidx, &comp_verts);
|
|
if (comp_num_verts > 0) {
|
|
// Transform vertices.
|
|
for (i = 0; i < comp_num_verts; ++i) {
|
|
stbtt_vertex* v = &comp_verts[i];
|
|
stbtt_vertex_type x,y;
|
|
x=v->x; y=v->y;
|
|
v->x = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
|
|
v->y = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
|
|
x=v->cx; y=v->cy;
|
|
v->cx = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
|
|
v->cy = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
|
|
}
|
|
// Append vertices.
|
|
tmp = (stbtt_vertex*)STBTT_malloc((num_vertices+comp_num_verts)*sizeof(stbtt_vertex), info->userdata);
|
|
if (!tmp) {
|
|
if (vertices) STBTT_free(vertices, info->userdata);
|
|
if (comp_verts) STBTT_free(comp_verts, info->userdata);
|
|
return 0;
|
|
}
|
|
if (num_vertices > 0) STBTT_memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex));
|
|
STBTT_memcpy(tmp+num_vertices, comp_verts, comp_num_verts*sizeof(stbtt_vertex));
|
|
if (vertices) STBTT_free(vertices, info->userdata);
|
|
vertices = tmp;
|
|
STBTT_free(comp_verts, info->userdata);
|
|
num_vertices += comp_num_verts;
|
|
}
|
|
// More components ?
|
|
more = flags & (1<<5);
|
|
}
|
|
} else if (numberOfContours < 0) {
|
|
// @TODO other compound variations?
|
|
STBTT_assert(0);
|
|
} else {
|
|
// numberOfCounters == 0, do nothing
|
|
}
|
|
|
|
*pvertices = vertices;
|
|
return num_vertices;
|
|
}
|
|
|
|
STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing)
|
|
{
|
|
stbtt_uint16 numOfLongHorMetrics = ttUSHORT(info->data+info->hhea + 34);
|
|
if (glyph_index < numOfLongHorMetrics) {
|
|
if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*glyph_index);
|
|
if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*glyph_index + 2);
|
|
} else {
|
|
if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*(numOfLongHorMetrics-1));
|
|
if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*numOfLongHorMetrics + 2*(glyph_index - numOfLongHorMetrics));
|
|
}
|
|
}
|
|
|
|
STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
|
|
{
|
|
stbtt_uint8 *data = info->data + info->kern;
|
|
stbtt_uint32 needle, straw;
|
|
int l, r, m;
|
|
|
|
// we only look at the first table. it must be 'horizontal' and format 0.
|
|
if (!info->kern)
|
|
return 0;
|
|
if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
|
|
return 0;
|
|
if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
|
|
return 0;
|
|
|
|
l = 0;
|
|
r = ttUSHORT(data+10) - 1;
|
|
needle = glyph1 << 16 | glyph2;
|
|
while (l <= r) {
|
|
m = (l + r) >> 1;
|
|
straw = ttULONG(data+18+(m*6)); // note: unaligned read
|
|
if (needle < straw)
|
|
r = m - 1;
|
|
else if (needle > straw)
|
|
l = m + 1;
|
|
else
|
|
return ttSHORT(data+22+(m*6));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2)
|
|
{
|
|
if (!info->kern) // if no kerning table, don't waste time looking up both codepoint->glyphs
|
|
return 0;
|
|
return stbtt_GetGlyphKernAdvance(info, stbtt_FindGlyphIndex(info,ch1), stbtt_FindGlyphIndex(info,ch2));
|
|
}
|
|
|
|
STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing)
|
|
{
|
|
stbtt_GetGlyphHMetrics(info, stbtt_FindGlyphIndex(info,codepoint), advanceWidth, leftSideBearing);
|
|
}
|
|
|
|
STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap)
|
|
{
|
|
if (ascent ) *ascent = ttSHORT(info->data+info->hhea + 4);
|
|
if (descent) *descent = ttSHORT(info->data+info->hhea + 6);
|
|
if (lineGap) *lineGap = ttSHORT(info->data+info->hhea + 8);
|
|
}
|
|
|
|
STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1)
|
|
{
|
|
*x0 = ttSHORT(info->data + info->head + 36);
|
|
*y0 = ttSHORT(info->data + info->head + 38);
|
|
*x1 = ttSHORT(info->data + info->head + 40);
|
|
*y1 = ttSHORT(info->data + info->head + 42);
|
|
}
|
|
|
|
STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float height)
|
|
{
|
|
int fheight = ttSHORT(info->data + info->hhea + 4) - ttSHORT(info->data + info->hhea + 6);
|
|
return (float) height / fheight;
|
|
}
|
|
|
|
STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels)
|
|
{
|
|
int unitsPerEm = ttUSHORT(info->data + info->head + 18);
|
|
return pixels / unitsPerEm;
|
|
}
|
|
|
|
STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
|
|
{
|
|
STBTT_free(v, info->userdata);
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// antialiasing software rasterizer
|
|
//
|
|
|
|
STBTT_DEF void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
|
|
{
|
|
int x0=0,y0=0,x1,y1; // =0 suppresses compiler warning
|
|
if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1)) {
|
|
// e.g. space character
|
|
if (ix0) *ix0 = 0;
|
|
if (iy0) *iy0 = 0;
|
|
if (ix1) *ix1 = 0;
|
|
if (iy1) *iy1 = 0;
|
|
} else {
|
|
// move to integral bboxes (treating pixels as little squares, what pixels get touched)?
|
|
if (ix0) *ix0 = STBTT_ifloor( x0 * scale_x + shift_x);
|
|
if (iy0) *iy0 = STBTT_ifloor(-y1 * scale_y + shift_y);
|
|
if (ix1) *ix1 = STBTT_iceil ( x1 * scale_x + shift_x);
|
|
if (iy1) *iy1 = STBTT_iceil (-y0 * scale_y + shift_y);
|
|
}
|
|
}
|
|
|
|
STBTT_DEF void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
|
|
{
|
|
stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y,0.0f,0.0f, ix0, iy0, ix1, iy1);
|
|
}
|
|
|
|
STBTT_DEF void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
|
|
{
|
|
stbtt_GetGlyphBitmapBoxSubpixel(font, stbtt_FindGlyphIndex(font,codepoint), scale_x, scale_y,shift_x,shift_y, ix0,iy0,ix1,iy1);
|
|
}
|
|
|
|
STBTT_DEF void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
|
|
{
|
|
stbtt_GetCodepointBitmapBoxSubpixel(font, codepoint, scale_x, scale_y,0.0f,0.0f, ix0,iy0,ix1,iy1);
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Rasterizer
|
|
|
|
typedef struct stbtt__hheap_chunk
|
|
{
|
|
struct stbtt__hheap_chunk *next;
|
|
} stbtt__hheap_chunk;
|
|
|
|
typedef struct stbtt__hheap
|
|
{
|
|
struct stbtt__hheap_chunk *head;
|
|
void *first_free;
|
|
int num_remaining_in_head_chunk;
|
|
} stbtt__hheap;
|
|
|
|
static void *stbtt__hheap_alloc(stbtt__hheap *hh, size_t size, void *userdata)
|
|
{
|
|
if (hh->first_free) {
|
|
void *p = hh->first_free;
|
|
hh->first_free = * (void **) p;
|
|
return p;
|
|
} else {
|
|
if (hh->num_remaining_in_head_chunk == 0) {
|
|
int count = (size < 32 ? 2000 : size < 128 ? 800 : 100);
|
|
stbtt__hheap_chunk *c = (stbtt__hheap_chunk *) STBTT_malloc(sizeof(stbtt__hheap_chunk) + size * count, userdata);
|
|
if (c == NULL)
|
|
return NULL;
|
|
c->next = hh->head;
|
|
hh->head = c;
|
|
hh->num_remaining_in_head_chunk = count;
|
|
}
|
|
--hh->num_remaining_in_head_chunk;
|
|
return (char *) (hh->head) + size * hh->num_remaining_in_head_chunk;
|
|
}
|
|
}
|
|
|
|
static void stbtt__hheap_free(stbtt__hheap *hh, void *p)
|
|
{
|
|
*(void **) p = hh->first_free;
|
|
hh->first_free = p;
|
|
}
|
|
|
|
static void stbtt__hheap_cleanup(stbtt__hheap *hh, void *userdata)
|
|
{
|
|
stbtt__hheap_chunk *c = hh->head;
|
|
while (c) {
|
|
stbtt__hheap_chunk *n = c->next;
|
|
STBTT_free(c, userdata);
|
|
c = n;
|
|
}
|
|
}
|
|
|
|
typedef struct stbtt__edge {
|
|
float x0,y0, x1,y1;
|
|
int invert;
|
|
} stbtt__edge;
|
|
|
|
|
|
typedef struct stbtt__active_edge
|
|
{
|
|
struct stbtt__active_edge *next;
|
|
#if STBTT_RASTERIZER_VERSION==1
|
|
int x,dx;
|
|
float ey;
|
|
int direction;
|
|
#elif STBTT_RASTERIZER_VERSION==2
|
|
float fx,fdx,fdy;
|
|
float direction;
|
|
float sy;
|
|
float ey;
|
|
#else
|
|
#error "Unrecognized value of STBTT_RASTERIZER_VERSION"
|
|
#endif
|
|
} stbtt__active_edge;
|
|
|
|
#if STBTT_RASTERIZER_VERSION == 1
|
|
#define STBTT_FIXSHIFT 10
|
|
#define STBTT_FIX (1 << STBTT_FIXSHIFT)
|
|
#define STBTT_FIXMASK (STBTT_FIX-1)
|
|
|
|
static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata)
|
|
{
|
|
stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata);
|
|
float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
|
|
STBTT_assert(z != NULL);
|
|
if (!z) return z;
|
|
|
|
// round dx down to avoid overshooting
|
|
if (dxdy < 0)
|
|
z->dx = -STBTT_ifloor(STBTT_FIX * -dxdy);
|
|
else
|
|
z->dx = STBTT_ifloor(STBTT_FIX * dxdy);
|
|
|
|
z->x = STBTT_ifloor(STBTT_FIX * e->x0 + z->dx * (start_point - e->y0)); // use z->dx so when we offset later it's by the same amount
|
|
z->x -= off_x * STBTT_FIX;
|
|
|
|
z->ey = e->y1;
|
|
z->next = 0;
|
|
z->direction = e->invert ? 1 : -1;
|
|
return z;
|
|
}
|
|
#elif STBTT_RASTERIZER_VERSION == 2
|
|
static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata)
|
|
{
|
|
stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata);
|
|
float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
|
|
STBTT_assert(z != NULL);
|
|
//STBTT_assert(e->y0 <= start_point);
|
|
if (!z) return z;
|
|
z->fdx = dxdy;
|
|
z->fdy = dxdy != 0.0f ? (1.0f/dxdy) : 0.0f;
|
|
z->fx = e->x0 + dxdy * (start_point - e->y0);
|
|
z->fx -= off_x;
|
|
z->direction = e->invert ? 1.0f : -1.0f;
|
|
z->sy = e->y0;
|
|
z->ey = e->y1;
|
|
z->next = 0;
|
|
return z;
|
|
}
|
|
#else
|
|
#error "Unrecognized value of STBTT_RASTERIZER_VERSION"
|
|
#endif
|
|
|
|
#if STBTT_RASTERIZER_VERSION == 1
|
|
// note: this routine clips fills that extend off the edges... ideally this
|
|
// wouldn't happen, but it could happen if the truetype glyph bounding boxes
|
|
// are wrong, or if the user supplies a too-small bitmap
|
|
static void stbtt__fill_active_edges(unsigned char *scanline, int len, stbtt__active_edge *e, int max_weight)
|
|
{
|
|
// non-zero winding fill
|
|
int x0=0, w=0;
|
|
|
|
while (e) {
|
|
if (w == 0) {
|
|
// if we're currently at zero, we need to record the edge start point
|
|
x0 = e->x; w += e->direction;
|
|
} else {
|
|
int x1 = e->x; w += e->direction;
|
|
// if we went to zero, we need to draw
|
|
if (w == 0) {
|
|
int i = x0 >> STBTT_FIXSHIFT;
|
|
int j = x1 >> STBTT_FIXSHIFT;
|
|
|
|
if (i < len && j >= 0) {
|
|
if (i == j) {
|
|
// x0,x1 are the same pixel, so compute combined coverage
|
|
scanline[i] = scanline[i] + (stbtt_uint8) ((x1 - x0) * max_weight >> STBTT_FIXSHIFT);
|
|
} else {
|
|
if (i >= 0) // add antialiasing for x0
|
|
scanline[i] = scanline[i] + (stbtt_uint8) (((STBTT_FIX - (x0 & STBTT_FIXMASK)) * max_weight) >> STBTT_FIXSHIFT);
|
|
else
|
|
i = -1; // clip
|
|
|
|
if (j < len) // add antialiasing for x1
|
|
scanline[j] = scanline[j] + (stbtt_uint8) (((x1 & STBTT_FIXMASK) * max_weight) >> STBTT_FIXSHIFT);
|
|
else
|
|
j = len; // clip
|
|
|
|
for (++i; i < j; ++i) // fill pixels between x0 and x1
|
|
scanline[i] = scanline[i] + (stbtt_uint8) max_weight;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
e = e->next;
|
|
}
|
|
}
|
|
|
|
static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
|
|
{
|
|
stbtt__hheap hh = { 0, 0, 0 };
|
|
stbtt__active_edge *active = NULL;
|
|
int y,j=0;
|
|
int max_weight = (255 / vsubsample); // weight per vertical scanline
|
|
int s; // vertical subsample index
|
|
unsigned char scanline_data[512], *scanline;
|
|
|
|
if (result->w > 512)
|
|
scanline = (unsigned char *) STBTT_malloc(result->w, userdata);
|
|
else
|
|
scanline = scanline_data;
|
|
|
|
y = off_y * vsubsample;
|
|
e[n].y0 = (off_y + result->h) * (float) vsubsample + 1;
|
|
|
|
while (j < result->h) {
|
|
STBTT_memset(scanline, 0, result->w);
|
|
for (s=0; s < vsubsample; ++s) {
|
|
// find center of pixel for this scanline
|
|
float scan_y = y + 0.5f;
|
|
stbtt__active_edge **step = &active;
|
|
|
|
// update all active edges;
|
|
// remove all active edges that terminate before the center of this scanline
|
|
while (*step) {
|
|
stbtt__active_edge * z = *step;
|
|
if (z->ey <= scan_y) {
|
|
*step = z->next; // delete from list
|
|
STBTT_assert(z->direction);
|
|
z->direction = 0;
|
|
stbtt__hheap_free(&hh, z);
|
|
} else {
|
|
z->x += z->dx; // advance to position for current scanline
|
|
step = &((*step)->next); // advance through list
|
|
}
|
|
}
|
|
|
|
// resort the list if needed
|
|
for(;;) {
|
|
int changed=0;
|
|
step = &active;
|
|
while (*step && (*step)->next) {
|
|
if ((*step)->x > (*step)->next->x) {
|
|
stbtt__active_edge *t = *step;
|
|
stbtt__active_edge *q = t->next;
|
|
|
|
t->next = q->next;
|
|
q->next = t;
|
|
*step = q;
|
|
changed = 1;
|
|
}
|
|
step = &(*step)->next;
|
|
}
|
|
if (!changed) break;
|
|
}
|
|
|
|
// insert all edges that start before the center of this scanline -- omit ones that also end on this scanline
|
|
while (e->y0 <= scan_y) {
|
|
if (e->y1 > scan_y) {
|
|
stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y, userdata);
|
|
if (z != NULL) {
|
|
// find insertion point
|
|
if (active == NULL)
|
|
active = z;
|
|
else if (z->x < active->x) {
|
|
// insert at front
|
|
z->next = active;
|
|
active = z;
|
|
} else {
|
|
// find thing to insert AFTER
|
|
stbtt__active_edge *p = active;
|
|
while (p->next && p->next->x < z->x)
|
|
p = p->next;
|
|
// at this point, p->next->x is NOT < z->x
|
|
z->next = p->next;
|
|
p->next = z;
|
|
}
|
|
}
|
|
}
|
|
++e;
|
|
}
|
|
|
|
// now process all active edges in XOR fashion
|
|
if (active)
|
|
stbtt__fill_active_edges(scanline, result->w, active, max_weight);
|
|
|
|
++y;
|
|
}
|
|
STBTT_memcpy(result->pixels + j * result->stride, scanline, result->w);
|
|
++j;
|
|
}
|
|
|
|
stbtt__hheap_cleanup(&hh, userdata);
|
|
|
|
if (scanline != scanline_data)
|
|
STBTT_free(scanline, userdata);
|
|
}
|
|
|
|
#elif STBTT_RASTERIZER_VERSION == 2
|
|
|
|
// the edge passed in here does not cross the vertical line at x or the vertical line at x+1
|
|
// (i.e. it has already been clipped to those)
|
|
static void stbtt__handle_clipped_edge(float *scanline, int x, stbtt__active_edge *e, float x0, float y0, float x1, float y1)
|
|
{
|
|
if (y0 == y1) return;
|
|
STBTT_assert(y0 < y1);
|
|
STBTT_assert(e->sy <= e->ey);
|
|
if (y0 > e->ey) return;
|
|
if (y1 < e->sy) return;
|
|
if (y0 < e->sy) {
|
|
x0 += (x1-x0) * (e->sy - y0) / (y1-y0);
|
|
y0 = e->sy;
|
|
}
|
|
if (y1 > e->ey) {
|
|
x1 += (x1-x0) * (e->ey - y1) / (y1-y0);
|
|
y1 = e->ey;
|
|
}
|
|
|
|
if (x0 == x)
|
|
STBTT_assert(x1 <= x+1);
|
|
else if (x0 == x+1)
|
|
STBTT_assert(x1 >= x);
|
|
else if (x0 <= x)
|
|
STBTT_assert(x1 <= x);
|
|
else if (x0 >= x+1)
|
|
STBTT_assert(x1 >= x+1);
|
|
else
|
|
STBTT_assert(x1 >= x && x1 <= x+1);
|
|
|
|
if (x0 <= x && x1 <= x)
|
|
scanline[x] += e->direction * (y1-y0);
|
|
else if (x0 >= x+1 && x1 >= x+1)
|
|
;
|
|
else {
|
|
STBTT_assert(x0 >= x && x0 <= x+1 && x1 >= x && x1 <= x+1);
|
|
scanline[x] += e->direction * (y1-y0) * (1-((x0-x)+(x1-x))/2); // coverage = 1 - average x position
|
|
}
|
|
}
|
|
|
|
static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill, int len, stbtt__active_edge *e, float y_top)
|
|
{
|
|
float y_bottom = y_top+1;
|
|
|
|
while (e) {
|
|
// brute force every pixel
|
|
|
|
// compute intersection points with top & bottom
|
|
STBTT_assert(e->ey >= y_top);
|
|
|
|
if (e->fdx == 0) {
|
|
float x0 = e->fx;
|
|
if (x0 < len) {
|
|
if (x0 >= 0) {
|
|
stbtt__handle_clipped_edge(scanline,(int) x0,e, x0,y_top, x0,y_bottom);
|
|
stbtt__handle_clipped_edge(scanline_fill-1,(int) x0+1,e, x0,y_top, x0,y_bottom);
|
|
} else {
|
|
stbtt__handle_clipped_edge(scanline_fill-1,0,e, x0,y_top, x0,y_bottom);
|
|
}
|
|
}
|
|
} else {
|
|
float x0 = e->fx;
|
|
float dx = e->fdx;
|
|
float xb = x0 + dx;
|
|
float x_top, x_bottom;
|
|
float sy0,sy1;
|
|
float dy = e->fdy;
|
|
STBTT_assert(e->sy <= y_bottom && e->ey >= y_top);
|
|
|
|
// compute endpoints of line segment clipped to this scanline (if the
|
|
// line segment starts on this scanline. x0 is the intersection of the
|
|
// line with y_top, but that may be off the line segment.
|
|
if (e->sy > y_top) {
|
|
x_top = x0 + dx * (e->sy - y_top);
|
|
sy0 = e->sy;
|
|
} else {
|
|
x_top = x0;
|
|
sy0 = y_top;
|
|
}
|
|
if (e->ey < y_bottom) {
|
|
x_bottom = x0 + dx * (e->ey - y_top);
|
|
sy1 = e->ey;
|
|
} else {
|
|
x_bottom = xb;
|
|
sy1 = y_bottom;
|
|
}
|
|
|
|
if (x_top >= 0 && x_bottom >= 0 && x_top < len && x_bottom < len) {
|
|
// from here on, we don't have to range check x values
|
|
|
|
if ((int) x_top == (int) x_bottom) {
|
|
float height;
|
|
// simple case, only spans one pixel
|
|
int x = (int) x_top;
|
|
height = sy1 - sy0;
|
|
STBTT_assert(x >= 0 && x < len);
|
|
scanline[x] += e->direction * (1-((x_top - x) + (x_bottom-x))/2) * height;
|
|
scanline_fill[x] += e->direction * height; // everything right of this pixel is filled
|
|
} else {
|
|
int x,x1,x2;
|
|
float y_crossing, step, sign, area;
|
|
// covers 2+ pixels
|
|
if (x_top > x_bottom) {
|
|
// flip scanline vertically; signed area is the same
|
|
float t;
|
|
sy0 = y_bottom - (sy0 - y_top);
|
|
sy1 = y_bottom - (sy1 - y_top);
|
|
t = sy0, sy0 = sy1, sy1 = t;
|
|
t = x_bottom, x_bottom = x_top, x_top = t;
|
|
dx = -dx;
|
|
dy = -dy;
|
|
t = x0, x0 = xb, xb = t;
|
|
}
|
|
|
|
x1 = (int) x_top;
|
|
x2 = (int) x_bottom;
|
|
// compute intersection with y axis at x1+1
|
|
y_crossing = (x1+1 - x0) * dy + y_top;
|
|
|
|
sign = e->direction;
|
|
// area of the rectangle covered from y0..y_crossing
|
|
area = sign * (y_crossing-sy0);
|
|
// area of the triangle (x_top,y0), (x+1,y0), (x+1,y_crossing)
|
|
scanline[x1] += area * (1-((x_top - x1)+(x1+1-x1))/2);
|
|
|
|
step = sign * dy;
|
|
for (x = x1+1; x < x2; ++x) {
|
|
scanline[x] += area + step/2;
|
|
area += step;
|
|
}
|
|
y_crossing += dy * (x2 - (x1+1));
|
|
|
|
STBTT_assert(STBTT_fabs(area) <= 1.01f);
|
|
|
|
scanline[x2] += area + sign * (1-((x2-x2)+(x_bottom-x2))/2) * (sy1-y_crossing);
|
|
|
|
scanline_fill[x2] += sign * (sy1-sy0);
|
|
}
|
|
} else {
|
|
// if edge goes outside of box we're drawing, we require
|
|
// clipping logic. since this does not match the intended use
|
|
// of this library, we use a different, very slow brute
|
|
// force implementation
|
|
int x;
|
|
for (x=0; x < len; ++x) {
|
|
// cases:
|
|
//
|
|
// there can be up to two intersections with the pixel. any intersection
|
|
// with left or right edges can be handled by splitting into two (or three)
|
|
// regions. intersections with top & bottom do not necessitate case-wise logic.
|
|
//
|
|
// the old way of doing this found the intersections with the left & right edges,
|
|
// then used some simple logic to produce up to three segments in sorted order
|
|
// from top-to-bottom. however, this had a problem: if an x edge was epsilon
|
|
// across the x border, then the corresponding y position might not be distinct
|
|
// from the other y segment, and it might ignored as an empty segment. to avoid
|
|
// that, we need to explicitly produce segments based on x positions.
|
|
|
|
// rename variables to clear pairs
|
|
float y0 = y_top;
|
|
float x1 = (float) (x);
|
|
float x2 = (float) (x+1);
|
|
float x3 = xb;
|
|
float y3 = y_bottom;
|
|
float y1,y2;
|
|
|
|
// x = e->x + e->dx * (y-y_top)
|
|
// (y-y_top) = (x - e->x) / e->dx
|
|
// y = (x - e->x) / e->dx + y_top
|
|
y1 = (x - x0) / dx + y_top;
|
|
y2 = (x+1 - x0) / dx + y_top;
|
|
|
|
if (x0 < x1 && x3 > x2) { // three segments descending down-right
|
|
stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
|
|
stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x2,y2);
|
|
stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
|
|
} else if (x3 < x1 && x0 > x2) { // three segments descending down-left
|
|
stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
|
|
stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x1,y1);
|
|
stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
|
|
} else if (x0 < x1 && x3 > x1) { // two segments across x, down-right
|
|
stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
|
|
stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
|
|
} else if (x3 < x1 && x0 > x1) { // two segments across x, down-left
|
|
stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
|
|
stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
|
|
} else if (x0 < x2 && x3 > x2) { // two segments across x+1, down-right
|
|
stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
|
|
stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
|
|
} else if (x3 < x2 && x0 > x2) { // two segments across x+1, down-left
|
|
stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
|
|
stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
|
|
} else { // one segment
|
|
stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x3,y3);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
e = e->next;
|
|
}
|
|
}
|
|
|
|
// directly AA rasterize edges w/o supersampling
|
|
static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
|
|
{
|
|
stbtt__hheap hh = { 0, 0, 0 };
|
|
stbtt__active_edge *active = NULL;
|
|
int y,j=0, i;
|
|
float scanline_data[129], *scanline, *scanline2;
|
|
|
|
STBTT__NOTUSED(vsubsample);
|
|
|
|
if (result->w > 64)
|
|
scanline = (float *) STBTT_malloc((result->w*2+1) * sizeof(float), userdata);
|
|
else
|
|
scanline = scanline_data;
|
|
|
|
scanline2 = scanline + result->w;
|
|
|
|
y = off_y;
|
|
e[n].y0 = (float) (off_y + result->h) + 1;
|
|
|
|
while (j < result->h) {
|
|
// find center of pixel for this scanline
|
|
float scan_y_top = y + 0.0f;
|
|
float scan_y_bottom = y + 1.0f;
|
|
stbtt__active_edge **step = &active;
|
|
|
|
STBTT_memset(scanline , 0, result->w*sizeof(scanline[0]));
|
|
STBTT_memset(scanline2, 0, (result->w+1)*sizeof(scanline[0]));
|
|
|
|
// update all active edges;
|
|
// remove all active edges that terminate before the top of this scanline
|
|
while (*step) {
|
|
stbtt__active_edge * z = *step;
|
|
if (z->ey <= scan_y_top) {
|
|
*step = z->next; // delete from list
|
|
STBTT_assert(z->direction);
|
|
z->direction = 0;
|
|
stbtt__hheap_free(&hh, z);
|
|
} else {
|
|
step = &((*step)->next); // advance through list
|
|
}
|
|
}
|
|
|
|
// insert all edges that start before the bottom of this scanline
|
|
while (e->y0 <= scan_y_bottom) {
|
|
if (e->y0 != e->y1) {
|
|
stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y_top, userdata);
|
|
if (z != NULL) {
|
|
STBTT_assert(z->ey >= scan_y_top);
|
|
// insert at front
|
|
z->next = active;
|
|
active = z;
|
|
}
|
|
}
|
|
++e;
|
|
}
|
|
|
|
// now process all active edges
|
|
if (active)
|
|
stbtt__fill_active_edges_new(scanline, scanline2+1, result->w, active, scan_y_top);
|
|
|
|
{
|
|
float sum = 0;
|
|
for (i=0; i < result->w; ++i) {
|
|
float k;
|
|
int m;
|
|
sum += scanline2[i];
|
|
k = scanline[i] + sum;
|
|
k = (float) STBTT_fabs(k)*255 + 0.5f;
|
|
m = (int) k;
|
|
if (m > 255) m = 255;
|
|
result->pixels[j*result->stride + i] = (unsigned char) m;
|
|
}
|
|
}
|
|
// advance all the edges
|
|
step = &active;
|
|
while (*step) {
|
|
stbtt__active_edge *z = *step;
|
|
z->fx += z->fdx; // advance to position for current scanline
|
|
step = &((*step)->next); // advance through list
|
|
}
|
|
|
|
++y;
|
|
++j;
|
|
}
|
|
|
|
stbtt__hheap_cleanup(&hh, userdata);
|
|
|
|
if (scanline != scanline_data)
|
|
STBTT_free(scanline, userdata);
|
|
}
|
|
#else
|
|
#error "Unrecognized value of STBTT_RASTERIZER_VERSION"
|
|
#endif
|
|
|
|
#define STBTT__COMPARE(a,b) ((a)->y0 < (b)->y0)
|
|
|
|
static void stbtt__sort_edges_ins_sort(stbtt__edge *p, int n)
|
|
{
|
|
int i,j;
|
|
for (i=1; i < n; ++i) {
|
|
stbtt__edge t = p[i], *a = &t;
|
|
j = i;
|
|
while (j > 0) {
|
|
stbtt__edge *b = &p[j-1];
|
|
int c = STBTT__COMPARE(a,b);
|
|
if (!c) break;
|
|
p[j] = p[j-1];
|
|
--j;
|
|
}
|
|
if (i != j)
|
|
p[j] = t;
|
|
}
|
|
}
|
|
|
|
static void stbtt__sort_edges_quicksort(stbtt__edge *p, int n)
|
|
{
|
|
/* threshhold for transitioning to insertion sort */
|
|
while (n > 12) {
|
|
stbtt__edge t;
|
|
int c01,c12,c,m,i,j;
|
|
|
|
/* compute median of three */
|
|
m = n >> 1;
|
|
c01 = STBTT__COMPARE(&p[0],&p[m]);
|
|
c12 = STBTT__COMPARE(&p[m],&p[n-1]);
|
|
/* if 0 >= mid >= end, or 0 < mid < end, then use mid */
|
|
if (c01 != c12) {
|
|
/* otherwise, we'll need to swap something else to middle */
|
|
int z;
|
|
c = STBTT__COMPARE(&p[0],&p[n-1]);
|
|
/* 0>mid && mid<n: 0>n => n; 0<n => 0 */
|
|
/* 0<mid && mid>n: 0>n => 0; 0<n => n */
|
|
z = (c == c12) ? 0 : n-1;
|
|
t = p[z];
|
|
p[z] = p[m];
|
|
p[m] = t;
|
|
}
|
|
/* now p[m] is the median-of-three */
|
|
/* swap it to the beginning so it won't move around */
|
|
t = p[0];
|
|
p[0] = p[m];
|
|
p[m] = t;
|
|
|
|
/* partition loop */
|
|
i=1;
|
|
j=n-1;
|
|
for(;;) {
|
|
/* handling of equality is crucial here */
|
|
/* for sentinels & efficiency with duplicates */
|
|
for (;;++i) {
|
|
if (!STBTT__COMPARE(&p[i], &p[0])) break;
|
|
}
|
|
for (;;--j) {
|
|
if (!STBTT__COMPARE(&p[0], &p[j])) break;
|
|
}
|
|
/* make sure we haven't crossed */
|
|
if (i >= j) break;
|
|
t = p[i];
|
|
p[i] = p[j];
|
|
p[j] = t;
|
|
|
|
++i;
|
|
--j;
|
|
}
|
|
/* recurse on smaller side, iterate on larger */
|
|
if (j < (n-i)) {
|
|
stbtt__sort_edges_quicksort(p,j);
|
|
p = p+i;
|
|
n = n-i;
|
|
} else {
|
|
stbtt__sort_edges_quicksort(p+i, n-i);
|
|
n = j;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void stbtt__sort_edges(stbtt__edge *p, int n)
|
|
{
|
|
stbtt__sort_edges_quicksort(p, n);
|
|
stbtt__sort_edges_ins_sort(p, n);
|
|
}
|
|
|
|
typedef struct
|
|
{
|
|
float x,y;
|
|
} stbtt__point;
|
|
|
|
static void stbtt__rasterize(stbtt__bitmap *result, stbtt__point *pts, int *wcount, int windings, float scale_x, float scale_y, float shift_x, float shift_y, int off_x, int off_y, int invert, void *userdata)
|
|
{
|
|
float y_scale_inv = invert ? -scale_y : scale_y;
|
|
stbtt__edge *e;
|
|
int n,i,j,k,m;
|
|
#if STBTT_RASTERIZER_VERSION == 1
|
|
int vsubsample = result->h < 8 ? 15 : 5;
|
|
#elif STBTT_RASTERIZER_VERSION == 2
|
|
int vsubsample = 1;
|
|
#else
|
|
#error "Unrecognized value of STBTT_RASTERIZER_VERSION"
|
|
#endif
|
|
// vsubsample should divide 255 evenly; otherwise we won't reach full opacity
|
|
|
|
// now we have to blow out the windings into explicit edge lists
|
|
n = 0;
|
|
for (i=0; i < windings; ++i)
|
|
n += wcount[i];
|
|
|
|
e = (stbtt__edge *) STBTT_malloc(sizeof(*e) * (n+1), userdata); // add an extra one as a sentinel
|
|
if (e == 0) return;
|
|
n = 0;
|
|
|
|
m=0;
|
|
for (i=0; i < windings; ++i) {
|
|
stbtt__point *p = pts + m;
|
|
m += wcount[i];
|
|
j = wcount[i]-1;
|
|
for (k=0; k < wcount[i]; j=k++) {
|
|
int a=k,b=j;
|
|
// skip the edge if horizontal
|
|
if (p[j].y == p[k].y)
|
|
continue;
|
|
// add edge from j to k to the list
|
|
e[n].invert = 0;
|
|
if (invert ? p[j].y > p[k].y : p[j].y < p[k].y) {
|
|
e[n].invert = 1;
|
|
a=j,b=k;
|
|
}
|
|
e[n].x0 = p[a].x * scale_x + shift_x;
|
|
e[n].y0 = (p[a].y * y_scale_inv + shift_y) * vsubsample;
|
|
e[n].x1 = p[b].x * scale_x + shift_x;
|
|
e[n].y1 = (p[b].y * y_scale_inv + shift_y) * vsubsample;
|
|
++n;
|
|
}
|
|
}
|
|
|
|
// now sort the edges by their highest point (should snap to integer, and then by x)
|
|
//STBTT_sort(e, n, sizeof(e[0]), stbtt__edge_compare);
|
|
stbtt__sort_edges(e, n);
|
|
|
|
// now, traverse the scanlines and find the intersections on each scanline, use xor winding rule
|
|
stbtt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y, userdata);
|
|
|
|
STBTT_free(e, userdata);
|
|
}
|
|
|
|
static void stbtt__add_point(stbtt__point *points, int n, float x, float y)
|
|
{
|
|
if (!points) return; // during first pass, it's unallocated
|
|
points[n].x = x;
|
|
points[n].y = y;
|
|
}
|
|
|
|
// tesselate until threshhold p is happy... @TODO warped to compensate for non-linear stretching
|
|
static int stbtt__tesselate_curve(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float objspace_flatness_squared, int n)
|
|
{
|
|
// midpoint
|
|
float mx = (x0 + 2*x1 + x2)/4;
|
|
float my = (y0 + 2*y1 + y2)/4;
|
|
// versus directly drawn line
|
|
float dx = (x0+x2)/2 - mx;
|
|
float dy = (y0+y2)/2 - my;
|
|
if (n > 16) // 65536 segments on one curve better be enough!
|
|
return 1;
|
|
if (dx*dx+dy*dy > objspace_flatness_squared) { // half-pixel error allowed... need to be smaller if AA
|
|
stbtt__tesselate_curve(points, num_points, x0,y0, (x0+x1)/2.0f,(y0+y1)/2.0f, mx,my, objspace_flatness_squared,n+1);
|
|
stbtt__tesselate_curve(points, num_points, mx,my, (x1+x2)/2.0f,(y1+y2)/2.0f, x2,y2, objspace_flatness_squared,n+1);
|
|
} else {
|
|
stbtt__add_point(points, *num_points,x2,y2);
|
|
*num_points = *num_points+1;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
// returns number of contours
|
|
static stbtt__point *stbtt_FlattenCurves(stbtt_vertex *vertices, int num_verts, float objspace_flatness, int **contour_lengths, int *num_contours, void *userdata)
|
|
{
|
|
stbtt__point *points=0;
|
|
int num_points=0;
|
|
|
|
float objspace_flatness_squared = objspace_flatness * objspace_flatness;
|
|
int i,n=0,start=0, pass;
|
|
|
|
// count how many "moves" there are to get the contour count
|
|
for (i=0; i < num_verts; ++i)
|
|
if (vertices[i].type == STBTT_vmove)
|
|
++n;
|
|
|
|
*num_contours = n;
|
|
if (n == 0) return 0;
|
|
|
|
*contour_lengths = (int *) STBTT_malloc(sizeof(**contour_lengths) * n, userdata);
|
|
|
|
if (*contour_lengths == 0) {
|
|
*num_contours = 0;
|
|
return 0;
|
|
}
|
|
|
|
// make two passes through the points so we don't need to realloc
|
|
for (pass=0; pass < 2; ++pass) {
|
|
float x=0,y=0;
|
|
if (pass == 1) {
|
|
points = (stbtt__point *) STBTT_malloc(num_points * sizeof(points[0]), userdata);
|
|
if (points == NULL) goto error;
|
|
}
|
|
num_points = 0;
|
|
n= -1;
|
|
for (i=0; i < num_verts; ++i) {
|
|
switch (vertices[i].type) {
|
|
case STBTT_vmove:
|
|
// start the next contour
|
|
if (n >= 0)
|
|
(*contour_lengths)[n] = num_points - start;
|
|
++n;
|
|
start = num_points;
|
|
|
|
x = vertices[i].x, y = vertices[i].y;
|
|
stbtt__add_point(points, num_points++, x,y);
|
|
break;
|
|
case STBTT_vline:
|
|
x = vertices[i].x, y = vertices[i].y;
|
|
stbtt__add_point(points, num_points++, x, y);
|
|
break;
|
|
case STBTT_vcurve:
|
|
stbtt__tesselate_curve(points, &num_points, x,y,
|
|
vertices[i].cx, vertices[i].cy,
|
|
vertices[i].x, vertices[i].y,
|
|
objspace_flatness_squared, 0);
|
|
x = vertices[i].x, y = vertices[i].y;
|
|
break;
|
|
}
|
|
}
|
|
(*contour_lengths)[n] = num_points - start;
|
|
}
|
|
|
|
return points;
|
|
error:
|
|
STBTT_free(points, userdata);
|
|
STBTT_free(*contour_lengths, userdata);
|
|
*contour_lengths = 0;
|
|
*num_contours = 0;
|
|
return NULL;
|
|
}
|
|
|
|
STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels, stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata)
|
|
{
|
|
float scale = scale_x > scale_y ? scale_y : scale_x;
|
|
int winding_count, *winding_lengths;
|
|
stbtt__point *windings = stbtt_FlattenCurves(vertices, num_verts, flatness_in_pixels / scale, &winding_lengths, &winding_count, userdata);
|
|
if (windings) {
|
|
stbtt__rasterize(result, windings, winding_lengths, winding_count, scale_x, scale_y, shift_x, shift_y, x_off, y_off, invert, userdata);
|
|
STBTT_free(winding_lengths, userdata);
|
|
STBTT_free(windings, userdata);
|
|
}
|
|
}
|
|
|
|
STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata)
|
|
{
|
|
STBTT_free(bitmap, userdata);
|
|
}
|
|
|
|
STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff)
|
|
{
|
|
int ix0,iy0,ix1,iy1;
|
|
stbtt__bitmap gbm;
|
|
stbtt_vertex *vertices;
|
|
int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
|
|
|
|
if (scale_x == 0) scale_x = scale_y;
|
|
if (scale_y == 0) {
|
|
if (scale_x == 0) {
|
|
STBTT_free(vertices, info->userdata);
|
|
return NULL;
|
|
}
|
|
scale_y = scale_x;
|
|
}
|
|
|
|
stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,&ix1,&iy1);
|
|
|
|
// now we get the size
|
|
gbm.w = (ix1 - ix0);
|
|
gbm.h = (iy1 - iy0);
|
|
gbm.pixels = NULL; // in case we error
|
|
|
|
if (width ) *width = gbm.w;
|
|
if (height) *height = gbm.h;
|
|
if (xoff ) *xoff = ix0;
|
|
if (yoff ) *yoff = iy0;
|
|
|
|
if (gbm.w && gbm.h) {
|
|
gbm.pixels = (unsigned char *) STBTT_malloc(gbm.w * gbm.h, info->userdata);
|
|
if (gbm.pixels) {
|
|
gbm.stride = gbm.w;
|
|
|
|
stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0, iy0, 1, info->userdata);
|
|
}
|
|
}
|
|
STBTT_free(vertices, info->userdata);
|
|
return gbm.pixels;
|
|
}
|
|
|
|
STBTT_DEF unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff)
|
|
{
|
|
return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y, 0.0f, 0.0f, glyph, width, height, xoff, yoff);
|
|
}
|
|
|
|
STBTT_DEF void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph)
|
|
{
|
|
int ix0,iy0;
|
|
stbtt_vertex *vertices;
|
|
int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
|
|
stbtt__bitmap gbm;
|
|
|
|
stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,0,0);
|
|
gbm.pixels = output;
|
|
gbm.w = out_w;
|
|
gbm.h = out_h;
|
|
gbm.stride = out_stride;
|
|
|
|
if (gbm.w && gbm.h)
|
|
stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0,iy0, 1, info->userdata);
|
|
|
|
STBTT_free(vertices, info->userdata);
|
|
}
|
|
|
|
STBTT_DEF void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph)
|
|
{
|
|
stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, glyph);
|
|
}
|
|
|
|
STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff)
|
|
{
|
|
return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y,shift_x,shift_y, stbtt_FindGlyphIndex(info,codepoint), width,height,xoff,yoff);
|
|
}
|
|
|
|
STBTT_DEF void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint)
|
|
{
|
|
stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, stbtt_FindGlyphIndex(info,codepoint));
|
|
}
|
|
|
|
STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff)
|
|
{
|
|
return stbtt_GetCodepointBitmapSubpixel(info, scale_x, scale_y, 0.0f,0.0f, codepoint, width,height,xoff,yoff);
|
|
}
|
|
|
|
STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint)
|
|
{
|
|
stbtt_MakeCodepointBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, codepoint);
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// bitmap baking
|
|
//
|
|
// This is SUPER-CRAPPY packing to keep source code small
|
|
|
|
static int stbtt_BakeFontBitmap_internal(unsigned char *data, int offset, // font location (use offset=0 for plain .ttf)
|
|
float pixel_height, // height of font in pixels
|
|
unsigned char *pixels, int pw, int ph, // bitmap to be filled in
|
|
int first_char, int num_chars, // characters to bake
|
|
stbtt_bakedchar *chardata)
|
|
{
|
|
float scale;
|
|
int x,y,bottom_y, i;
|
|
stbtt_fontinfo f;
|
|
f.userdata = NULL;
|
|
if (!stbtt_InitFont(&f, data, offset))
|
|
return -1;
|
|
STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
|
|
x=y=1;
|
|
bottom_y = 1;
|
|
|
|
scale = stbtt_ScaleForPixelHeight(&f, pixel_height);
|
|
|
|
for (i=0; i < num_chars; ++i) {
|
|
int advance, lsb, x0,y0,x1,y1,gw,gh;
|
|
int g = stbtt_FindGlyphIndex(&f, first_char + i);
|
|
stbtt_GetGlyphHMetrics(&f, g, &advance, &lsb);
|
|
stbtt_GetGlyphBitmapBox(&f, g, scale,scale, &x0,&y0,&x1,&y1);
|
|
gw = x1-x0;
|
|
gh = y1-y0;
|
|
if (x + gw + 1 >= pw)
|
|
y = bottom_y, x = 1; // advance to next row
|
|
if (y + gh + 1 >= ph) // check if it fits vertically AFTER potentially moving to next row
|
|
return -i;
|
|
STBTT_assert(x+gw < pw);
|
|
STBTT_assert(y+gh < ph);
|
|
stbtt_MakeGlyphBitmap(&f, pixels+x+y*pw, gw,gh,pw, scale,scale, g);
|
|
chardata[i].x0 = (stbtt_int16) x;
|
|
chardata[i].y0 = (stbtt_int16) y;
|
|
chardata[i].x1 = (stbtt_int16) (x + gw);
|
|
chardata[i].y1 = (stbtt_int16) (y + gh);
|
|
chardata[i].xadvance = scale * advance;
|
|
chardata[i].xoff = (float) x0;
|
|
chardata[i].yoff = (float) y0;
|
|
x = x + gw + 1;
|
|
if (y+gh+1 > bottom_y)
|
|
bottom_y = y+gh+1;
|
|
}
|
|
return bottom_y;
|
|
}
|
|
|
|
STBTT_DEF void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int opengl_fillrule)
|
|
{
|
|
float d3d_bias = opengl_fillrule ? 0 : -0.5f;
|
|
float ipw = 1.0f / pw, iph = 1.0f / ph;
|
|
stbtt_bakedchar *b = chardata + char_index;
|
|
int round_x = STBTT_ifloor((*xpos + b->xoff) + 0.5f);
|
|
int round_y = STBTT_ifloor((*ypos + b->yoff) + 0.5f);
|
|
|
|
q->x0 = round_x + d3d_bias;
|
|
q->y0 = round_y + d3d_bias;
|
|
q->x1 = round_x + b->x1 - b->x0 + d3d_bias;
|
|
q->y1 = round_y + b->y1 - b->y0 + d3d_bias;
|
|
|
|
q->s0 = b->x0 * ipw;
|
|
q->t0 = b->y0 * iph;
|
|
q->s1 = b->x1 * ipw;
|
|
q->t1 = b->y1 * iph;
|
|
|
|
*xpos += b->xadvance;
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// rectangle packing replacement routines if you don't have stb_rect_pack.h
|
|
//
|
|
|
|
#ifndef STB_RECT_PACK_VERSION
|
|
|
|
typedef int stbrp_coord;
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////
|
|
// //
|
|
// //
|
|
// COMPILER WARNING ?!?!? //
|
|
// //
|
|
// //
|
|
// if you get a compile warning due to these symbols being defined more than //
|
|
// once, move #include "stb_rect_pack.h" before #include "stb_truetype.h" //
|
|
// //
|
|
////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
typedef struct
|
|
{
|
|
int width,height;
|
|
int x,y,bottom_y;
|
|
} stbrp_context;
|
|
|
|
typedef struct
|
|
{
|
|
unsigned char x;
|
|
} stbrp_node;
|
|
|
|
struct stbrp_rect
|
|
{
|
|
stbrp_coord x,y;
|
|
int id,w,h,was_packed;
|
|
};
|
|
|
|
static void stbrp_init_target(stbrp_context *con, int pw, int ph, stbrp_node *nodes, int num_nodes)
|
|
{
|
|
con->width = pw;
|
|
con->height = ph;
|
|
con->x = 0;
|
|
con->y = 0;
|
|
con->bottom_y = 0;
|
|
STBTT__NOTUSED(nodes);
|
|
STBTT__NOTUSED(num_nodes);
|
|
}
|
|
|
|
static void stbrp_pack_rects(stbrp_context *con, stbrp_rect *rects, int num_rects)
|
|
{
|
|
int i;
|
|
for (i=0; i < num_rects; ++i) {
|
|
if (con->x + rects[i].w > con->width) {
|
|
con->x = 0;
|
|
con->y = con->bottom_y;
|
|
}
|
|
if (con->y + rects[i].h > con->height)
|
|
break;
|
|
rects[i].x = con->x;
|
|
rects[i].y = con->y;
|
|
rects[i].was_packed = 1;
|
|
con->x += rects[i].w;
|
|
if (con->y + rects[i].h > con->bottom_y)
|
|
con->bottom_y = con->y + rects[i].h;
|
|
}
|
|
for ( ; i < num_rects; ++i)
|
|
rects[i].was_packed = 0;
|
|
}
|
|
#endif
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// bitmap baking
|
|
//
|
|
// This is SUPER-AWESOME (tm Ryan Gordon) packing using stb_rect_pack.h. If
|
|
// stb_rect_pack.h isn't available, it uses the BakeFontBitmap strategy.
|
|
|
|
STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int pw, int ph, int stride_in_bytes, int padding, void *alloc_context)
|
|
{
|
|
stbrp_context *context = (stbrp_context *) STBTT_malloc(sizeof(*context) ,alloc_context);
|
|
int num_nodes = pw - padding;
|
|
stbrp_node *nodes = (stbrp_node *) STBTT_malloc(sizeof(*nodes ) * num_nodes,alloc_context);
|
|
|
|
if (context == NULL || nodes == NULL) {
|
|
if (context != NULL) STBTT_free(context, alloc_context);
|
|
if (nodes != NULL) STBTT_free(nodes , alloc_context);
|
|
return 0;
|
|
}
|
|
|
|
spc->user_allocator_context = alloc_context;
|
|
spc->width = pw;
|
|
spc->height = ph;
|
|
spc->pixels = pixels;
|
|
spc->pack_info = context;
|
|
spc->nodes = nodes;
|
|
spc->padding = padding;
|
|
spc->stride_in_bytes = stride_in_bytes != 0 ? stride_in_bytes : pw;
|
|
spc->h_oversample = 1;
|
|
spc->v_oversample = 1;
|
|
|
|
stbrp_init_target(context, pw-padding, ph-padding, nodes, num_nodes);
|
|
|
|
if (pixels)
|
|
STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
|
|
|
|
return 1;
|
|
}
|
|
|
|
STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc)
|
|
{
|
|
STBTT_free(spc->nodes , spc->user_allocator_context);
|
|
STBTT_free(spc->pack_info, spc->user_allocator_context);
|
|
}
|
|
|
|
STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample)
|
|
{
|
|
STBTT_assert(h_oversample <= STBTT_MAX_OVERSAMPLE);
|
|
STBTT_assert(v_oversample <= STBTT_MAX_OVERSAMPLE);
|
|
if (h_oversample <= STBTT_MAX_OVERSAMPLE)
|
|
spc->h_oversample = h_oversample;
|
|
if (v_oversample <= STBTT_MAX_OVERSAMPLE)
|
|
spc->v_oversample = v_oversample;
|
|
}
|
|
|
|
#define STBTT__OVER_MASK (STBTT_MAX_OVERSAMPLE-1)
|
|
|
|
static void stbtt__h_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width)
|
|
{
|
|
unsigned char buffer[STBTT_MAX_OVERSAMPLE];
|
|
int safe_w = w - kernel_width;
|
|
int j;
|
|
STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze
|
|
for (j=0; j < h; ++j) {
|
|
int i;
|
|
unsigned int total;
|
|
STBTT_memset(buffer, 0, kernel_width);
|
|
|
|
total = 0;
|
|
|
|
// make kernel_width a constant in common cases so compiler can optimize out the divide
|
|
switch (kernel_width) {
|
|
case 2:
|
|
for (i=0; i <= safe_w; ++i) {
|
|
total += pixels[i] - buffer[i & STBTT__OVER_MASK];
|
|
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
|
|
pixels[i] = (unsigned char) (total / 2);
|
|
}
|
|
break;
|
|
case 3:
|
|
for (i=0; i <= safe_w; ++i) {
|
|
total += pixels[i] - buffer[i & STBTT__OVER_MASK];
|
|
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
|
|
pixels[i] = (unsigned char) (total / 3);
|
|
}
|
|
break;
|
|
case 4:
|
|
for (i=0; i <= safe_w; ++i) {
|
|
total += pixels[i] - buffer[i & STBTT__OVER_MASK];
|
|
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
|
|
pixels[i] = (unsigned char) (total / 4);
|
|
}
|
|
break;
|
|
case 5:
|
|
for (i=0; i <= safe_w; ++i) {
|
|
total += pixels[i] - buffer[i & STBTT__OVER_MASK];
|
|
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
|
|
pixels[i] = (unsigned char) (total / 5);
|
|
}
|
|
break;
|
|
default:
|
|
for (i=0; i <= safe_w; ++i) {
|
|
total += pixels[i] - buffer[i & STBTT__OVER_MASK];
|
|
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
|
|
pixels[i] = (unsigned char) (total / kernel_width);
|
|
}
|
|
break;
|
|
}
|
|
|
|
for (; i < w; ++i) {
|
|
STBTT_assert(pixels[i] == 0);
|
|
total -= buffer[i & STBTT__OVER_MASK];
|
|
pixels[i] = (unsigned char) (total / kernel_width);
|
|
}
|
|
|
|
pixels += stride_in_bytes;
|
|
}
|
|
}
|
|
|
|
static void stbtt__v_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width)
|
|
{
|
|
unsigned char buffer[STBTT_MAX_OVERSAMPLE];
|
|
int safe_h = h - kernel_width;
|
|
int j;
|
|
STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze
|
|
for (j=0; j < w; ++j) {
|
|
int i;
|
|
unsigned int total;
|
|
STBTT_memset(buffer, 0, kernel_width);
|
|
|
|
total = 0;
|
|
|
|
// make kernel_width a constant in common cases so compiler can optimize out the divide
|
|
switch (kernel_width) {
|
|
case 2:
|
|
for (i=0; i <= safe_h; ++i) {
|
|
total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
|
|
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
|
|
pixels[i*stride_in_bytes] = (unsigned char) (total / 2);
|
|
}
|
|
break;
|
|
case 3:
|
|
for (i=0; i <= safe_h; ++i) {
|
|
total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
|
|
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
|
|
pixels[i*stride_in_bytes] = (unsigned char) (total / 3);
|
|
}
|
|
break;
|
|
case 4:
|
|
for (i=0; i <= safe_h; ++i) {
|
|
total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
|
|
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
|
|
pixels[i*stride_in_bytes] = (unsigned char) (total / 4);
|
|
}
|
|
break;
|
|
case 5:
|
|
for (i=0; i <= safe_h; ++i) {
|
|
total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
|
|
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
|
|
pixels[i*stride_in_bytes] = (unsigned char) (total / 5);
|
|
}
|
|
break;
|
|
default:
|
|
for (i=0; i <= safe_h; ++i) {
|
|
total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
|
|
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
|
|
pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width);
|
|
}
|
|
break;
|
|
}
|
|
|
|
for (; i < h; ++i) {
|
|
STBTT_assert(pixels[i*stride_in_bytes] == 0);
|
|
total -= buffer[i & STBTT__OVER_MASK];
|
|
pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width);
|
|
}
|
|
|
|
pixels += 1;
|
|
}
|
|
}
|
|
|
|
static float stbtt__oversample_shift(int oversample)
|
|
{
|
|
if (!oversample)
|
|
return 0.0f;
|
|
|
|
// The prefilter is a box filter of width "oversample",
|
|
// which shifts phase by (oversample - 1)/2 pixels in
|
|
// oversampled space. We want to shift in the opposite
|
|
// direction to counter this.
|
|
return (float)-(oversample - 1) / (2.0f * (float)oversample);
|
|
}
|
|
|
|
// rects array must be big enough to accommodate all characters in the given ranges
|
|
STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
|
|
{
|
|
int i,j,k;
|
|
|
|
k=0;
|
|
for (i=0; i < num_ranges; ++i) {
|
|
float fh = ranges[i].font_size;
|
|
float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh);
|
|
ranges[i].h_oversample = (unsigned char) spc->h_oversample;
|
|
ranges[i].v_oversample = (unsigned char) spc->v_oversample;
|
|
for (j=0; j < ranges[i].num_chars; ++j) {
|
|
int x0,y0,x1,y1;
|
|
int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
|
|
int glyph = stbtt_FindGlyphIndex(info, codepoint);
|
|
stbtt_GetGlyphBitmapBoxSubpixel(info,glyph,
|
|
scale * spc->h_oversample,
|
|
scale * spc->v_oversample,
|
|
0,0,
|
|
&x0,&y0,&x1,&y1);
|
|
rects[k].w = (stbrp_coord) (x1-x0 + spc->padding + spc->h_oversample-1);
|
|
rects[k].h = (stbrp_coord) (y1-y0 + spc->padding + spc->v_oversample-1);
|
|
++k;
|
|
}
|
|
}
|
|
|
|
return k;
|
|
}
|
|
|
|
// rects array must be big enough to accommodate all characters in the given ranges
|
|
STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
|
|
{
|
|
int i,j,k, return_value = 1;
|
|
|
|
// save current values
|
|
int old_h_over = spc->h_oversample;
|
|
int old_v_over = spc->v_oversample;
|
|
|
|
k = 0;
|
|
for (i=0; i < num_ranges; ++i) {
|
|
float fh = ranges[i].font_size;
|
|
float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh);
|
|
float recip_h,recip_v,sub_x,sub_y;
|
|
spc->h_oversample = ranges[i].h_oversample;
|
|
spc->v_oversample = ranges[i].v_oversample;
|
|
recip_h = 1.0f / spc->h_oversample;
|
|
recip_v = 1.0f / spc->v_oversample;
|
|
sub_x = stbtt__oversample_shift(spc->h_oversample);
|
|
sub_y = stbtt__oversample_shift(spc->v_oversample);
|
|
for (j=0; j < ranges[i].num_chars; ++j) {
|
|
stbrp_rect *r = &rects[k];
|
|
if (r->was_packed) {
|
|
stbtt_packedchar *bc = &ranges[i].chardata_for_range[j];
|
|
int advance, lsb, x0,y0,x1,y1;
|
|
int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
|
|
int glyph = stbtt_FindGlyphIndex(info, codepoint);
|
|
stbrp_coord pad = (stbrp_coord) spc->padding;
|
|
|
|
// pad on left and top
|
|
r->x += pad;
|
|
r->y += pad;
|
|
r->w -= pad;
|
|
r->h -= pad;
|
|
stbtt_GetGlyphHMetrics(info, glyph, &advance, &lsb);
|
|
stbtt_GetGlyphBitmapBox(info, glyph,
|
|
scale * spc->h_oversample,
|
|
scale * spc->v_oversample,
|
|
&x0,&y0,&x1,&y1);
|
|
stbtt_MakeGlyphBitmapSubpixel(info,
|
|
spc->pixels + r->x + r->y*spc->stride_in_bytes,
|
|
r->w - spc->h_oversample+1,
|
|
r->h - spc->v_oversample+1,
|
|
spc->stride_in_bytes,
|
|
scale * spc->h_oversample,
|
|
scale * spc->v_oversample,
|
|
0,0,
|
|
glyph);
|
|
|
|
if (spc->h_oversample > 1)
|
|
stbtt__h_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes,
|
|
r->w, r->h, spc->stride_in_bytes,
|
|
spc->h_oversample);
|
|
|
|
if (spc->v_oversample > 1)
|
|
stbtt__v_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes,
|
|
r->w, r->h, spc->stride_in_bytes,
|
|
spc->v_oversample);
|
|
|
|
bc->x0 = (stbtt_int16) r->x;
|
|
bc->y0 = (stbtt_int16) r->y;
|
|
bc->x1 = (stbtt_int16) (r->x + r->w);
|
|
bc->y1 = (stbtt_int16) (r->y + r->h);
|
|
bc->xadvance = scale * advance;
|
|
bc->xoff = (float) x0 * recip_h + sub_x;
|
|
bc->yoff = (float) y0 * recip_v + sub_y;
|
|
bc->xoff2 = (x0 + r->w) * recip_h + sub_x;
|
|
bc->yoff2 = (y0 + r->h) * recip_v + sub_y;
|
|
} else {
|
|
return_value = 0; // if any fail, report failure
|
|
}
|
|
|
|
++k;
|
|
}
|
|
}
|
|
|
|
// restore original values
|
|
spc->h_oversample = old_h_over;
|
|
spc->v_oversample = old_v_over;
|
|
|
|
return return_value;
|
|
}
|
|
|
|
STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects)
|
|
{
|
|
stbrp_pack_rects((stbrp_context *) spc->pack_info, rects, num_rects);
|
|
}
|
|
|
|
STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges)
|
|
{
|
|
stbtt_fontinfo info;
|
|
int i,j,n, return_value = 1;
|
|
//stbrp_context *context = (stbrp_context *) spc->pack_info;
|
|
stbrp_rect *rects;
|
|
|
|
// flag all characters as NOT packed
|
|
for (i=0; i < num_ranges; ++i)
|
|
for (j=0; j < ranges[i].num_chars; ++j)
|
|
ranges[i].chardata_for_range[j].x0 =
|
|
ranges[i].chardata_for_range[j].y0 =
|
|
ranges[i].chardata_for_range[j].x1 =
|
|
ranges[i].chardata_for_range[j].y1 = 0;
|
|
|
|
n = 0;
|
|
for (i=0; i < num_ranges; ++i)
|
|
n += ranges[i].num_chars;
|
|
|
|
rects = (stbrp_rect *) STBTT_malloc(sizeof(*rects) * n, spc->user_allocator_context);
|
|
if (rects == NULL)
|
|
return 0;
|
|
|
|
info.userdata = spc->user_allocator_context;
|
|
stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata,font_index));
|
|
|
|
n = stbtt_PackFontRangesGatherRects(spc, &info, ranges, num_ranges, rects);
|
|
|
|
stbtt_PackFontRangesPackRects(spc, rects, n);
|
|
|
|
return_value = stbtt_PackFontRangesRenderIntoRects(spc, &info, ranges, num_ranges, rects);
|
|
|
|
STBTT_free(rects, spc->user_allocator_context);
|
|
return return_value;
|
|
}
|
|
|
|
STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, float font_size,
|
|
int first_unicode_codepoint_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range)
|
|
{
|
|
stbtt_pack_range range;
|
|
range.first_unicode_codepoint_in_range = first_unicode_codepoint_in_range;
|
|
range.array_of_unicode_codepoints = NULL;
|
|
range.num_chars = num_chars_in_range;
|
|
range.chardata_for_range = chardata_for_range;
|
|
range.font_size = font_size;
|
|
return stbtt_PackFontRanges(spc, fontdata, font_index, &range, 1);
|
|
}
|
|
|
|
STBTT_DEF void stbtt_GetPackedQuad(stbtt_packedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int align_to_integer)
|
|
{
|
|
float ipw = 1.0f / pw, iph = 1.0f / ph;
|
|
stbtt_packedchar *b = chardata + char_index;
|
|
|
|
if (align_to_integer) {
|
|
float x = (float) STBTT_ifloor((*xpos + b->xoff) + 0.5f);
|
|
float y = (float) STBTT_ifloor((*ypos + b->yoff) + 0.5f);
|
|
q->x0 = x;
|
|
q->y0 = y;
|
|
q->x1 = x + b->xoff2 - b->xoff;
|
|
q->y1 = y + b->yoff2 - b->yoff;
|
|
} else {
|
|
q->x0 = *xpos + b->xoff;
|
|
q->y0 = *ypos + b->yoff;
|
|
q->x1 = *xpos + b->xoff2;
|
|
q->y1 = *ypos + b->yoff2;
|
|
}
|
|
|
|
q->s0 = b->x0 * ipw;
|
|
q->t0 = b->y0 * iph;
|
|
q->s1 = b->x1 * ipw;
|
|
q->t1 = b->y1 * iph;
|
|
|
|
*xpos += b->xadvance;
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// font name matching -- recommended not to use this
|
|
//
|
|
|
|
// check if a utf8 string contains a prefix which is the utf16 string; if so return length of matching utf8 string
|
|
static stbtt_int32 stbtt__CompareUTF8toUTF16_bigendian_prefix(stbtt_uint8 *s1, stbtt_int32 len1, stbtt_uint8 *s2, stbtt_int32 len2)
|
|
{
|
|
stbtt_int32 i=0;
|
|
|
|
// convert utf16 to utf8 and compare the results while converting
|
|
while (len2) {
|
|
stbtt_uint16 ch = s2[0]*256 + s2[1];
|
|
if (ch < 0x80) {
|
|
if (i >= len1) return -1;
|
|
if (s1[i++] != ch) return -1;
|
|
} else if (ch < 0x800) {
|
|
if (i+1 >= len1) return -1;
|
|
if (s1[i++] != 0xc0 + (ch >> 6)) return -1;
|
|
if (s1[i++] != 0x80 + (ch & 0x3f)) return -1;
|
|
} else if (ch >= 0xd800 && ch < 0xdc00) {
|
|
stbtt_uint32 c;
|
|
stbtt_uint16 ch2 = s2[2]*256 + s2[3];
|
|
if (i+3 >= len1) return -1;
|
|
c = ((ch - 0xd800) << 10) + (ch2 - 0xdc00) + 0x10000;
|
|
if (s1[i++] != 0xf0 + (c >> 18)) return -1;
|
|
if (s1[i++] != 0x80 + ((c >> 12) & 0x3f)) return -1;
|
|
if (s1[i++] != 0x80 + ((c >> 6) & 0x3f)) return -1;
|
|
if (s1[i++] != 0x80 + ((c ) & 0x3f)) return -1;
|
|
s2 += 2; // plus another 2 below
|
|
len2 -= 2;
|
|
} else if (ch >= 0xdc00 && ch < 0xe000) {
|
|
return -1;
|
|
} else {
|
|
if (i+2 >= len1) return -1;
|
|
if (s1[i++] != 0xe0 + (ch >> 12)) return -1;
|
|
if (s1[i++] != 0x80 + ((ch >> 6) & 0x3f)) return -1;
|
|
if (s1[i++] != 0x80 + ((ch ) & 0x3f)) return -1;
|
|
}
|
|
s2 += 2;
|
|
len2 -= 2;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
static int stbtt_CompareUTF8toUTF16_bigendian_internal(char *s1, int len1, char *s2, int len2)
|
|
{
|
|
return len1 == stbtt__CompareUTF8toUTF16_bigendian_prefix((stbtt_uint8*) s1, len1, (stbtt_uint8*) s2, len2);
|
|
}
|
|
|
|
// returns results in whatever encoding you request... but note that 2-byte encodings
|
|
// will be BIG-ENDIAN... use stbtt_CompareUTF8toUTF16_bigendian() to compare
|
|
STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID)
|
|
{
|
|
stbtt_int32 i,count,stringOffset;
|
|
stbtt_uint8 *fc = font->data;
|
|
stbtt_uint32 offset = font->fontstart;
|
|
stbtt_uint32 nm = stbtt__find_table(fc, offset, "name");
|
|
if (!nm) return NULL;
|
|
|
|
count = ttUSHORT(fc+nm+2);
|
|
stringOffset = nm + ttUSHORT(fc+nm+4);
|
|
for (i=0; i < count; ++i) {
|
|
stbtt_uint32 loc = nm + 6 + 12 * i;
|
|
if (platformID == ttUSHORT(fc+loc+0) && encodingID == ttUSHORT(fc+loc+2)
|
|
&& languageID == ttUSHORT(fc+loc+4) && nameID == ttUSHORT(fc+loc+6)) {
|
|
*length = ttUSHORT(fc+loc+8);
|
|
return (const char *) (fc+stringOffset+ttUSHORT(fc+loc+10));
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int stbtt__matchpair(stbtt_uint8 *fc, stbtt_uint32 nm, stbtt_uint8 *name, stbtt_int32 nlen, stbtt_int32 target_id, stbtt_int32 next_id)
|
|
{
|
|
stbtt_int32 i;
|
|
stbtt_int32 count = ttUSHORT(fc+nm+2);
|
|
stbtt_int32 stringOffset = nm + ttUSHORT(fc+nm+4);
|
|
|
|
for (i=0; i < count; ++i) {
|
|
stbtt_uint32 loc = nm + 6 + 12 * i;
|
|
stbtt_int32 id = ttUSHORT(fc+loc+6);
|
|
if (id == target_id) {
|
|
// find the encoding
|
|
stbtt_int32 platform = ttUSHORT(fc+loc+0), encoding = ttUSHORT(fc+loc+2), language = ttUSHORT(fc+loc+4);
|
|
|
|
// is this a Unicode encoding?
|
|
if (platform == 0 || (platform == 3 && encoding == 1) || (platform == 3 && encoding == 10)) {
|
|
stbtt_int32 slen = ttUSHORT(fc+loc+8);
|
|
stbtt_int32 off = ttUSHORT(fc+loc+10);
|
|
|
|
// check if there's a prefix match
|
|
stbtt_int32 matchlen = stbtt__CompareUTF8toUTF16_bigendian_prefix(name, nlen, fc+stringOffset+off,slen);
|
|
if (matchlen >= 0) {
|
|
// check for target_id+1 immediately following, with same encoding & language
|
|
if (i+1 < count && ttUSHORT(fc+loc+12+6) == next_id && ttUSHORT(fc+loc+12) == platform && ttUSHORT(fc+loc+12+2) == encoding && ttUSHORT(fc+loc+12+4) == language) {
|
|
slen = ttUSHORT(fc+loc+12+8);
|
|
off = ttUSHORT(fc+loc+12+10);
|
|
if (slen == 0) {
|
|
if (matchlen == nlen)
|
|
return 1;
|
|
} else if (matchlen < nlen && name[matchlen] == ' ') {
|
|
++matchlen;
|
|
if (stbtt_CompareUTF8toUTF16_bigendian_internal((char*) (name+matchlen), nlen-matchlen, (char*)(fc+stringOffset+off),slen))
|
|
return 1;
|
|
}
|
|
} else {
|
|
// if nothing immediately following
|
|
if (matchlen == nlen)
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
// @TODO handle other encodings
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int stbtt__matches(stbtt_uint8 *fc, stbtt_uint32 offset, stbtt_uint8 *name, stbtt_int32 flags)
|
|
{
|
|
stbtt_int32 nlen = (stbtt_int32) STBTT_strlen((char *) name);
|
|
stbtt_uint32 nm,hd;
|
|
if (!stbtt__isfont(fc+offset)) return 0;
|
|
|
|
// check italics/bold/underline flags in macStyle...
|
|
if (flags) {
|
|
hd = stbtt__find_table(fc, offset, "head");
|
|
if ((ttUSHORT(fc+hd+44) & 7) != (flags & 7)) return 0;
|
|
}
|
|
|
|
nm = stbtt__find_table(fc, offset, "name");
|
|
if (!nm) return 0;
|
|
|
|
if (flags) {
|
|
// if we checked the macStyle flags, then just check the family and ignore the subfamily
|
|
if (stbtt__matchpair(fc, nm, name, nlen, 16, -1)) return 1;
|
|
if (stbtt__matchpair(fc, nm, name, nlen, 1, -1)) return 1;
|
|
if (stbtt__matchpair(fc, nm, name, nlen, 3, -1)) return 1;
|
|
} else {
|
|
if (stbtt__matchpair(fc, nm, name, nlen, 16, 17)) return 1;
|
|
if (stbtt__matchpair(fc, nm, name, nlen, 1, 2)) return 1;
|
|
if (stbtt__matchpair(fc, nm, name, nlen, 3, -1)) return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stbtt_FindMatchingFont_internal(unsigned char *font_collection, char *name_utf8, stbtt_int32 flags)
|
|
{
|
|
stbtt_int32 i;
|
|
for (i=0;;++i) {
|
|
stbtt_int32 off = stbtt_GetFontOffsetForIndex(font_collection, i);
|
|
if (off < 0) return off;
|
|
if (stbtt__matches((stbtt_uint8 *) font_collection, off, (stbtt_uint8*) name_utf8, flags))
|
|
return off;
|
|
}
|
|
}
|
|
|
|
#if defined(__GNUC__) || defined(__clang__)
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wcast-qual"
|
|
#endif
|
|
|
|
STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset,
|
|
float pixel_height, unsigned char *pixels, int pw, int ph,
|
|
int first_char, int num_chars, stbtt_bakedchar *chardata)
|
|
{
|
|
return stbtt_BakeFontBitmap_internal((unsigned char *) data, offset, pixel_height, pixels, pw, ph, first_char, num_chars, chardata);
|
|
}
|
|
|
|
STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index)
|
|
{
|
|
return stbtt_GetFontOffsetForIndex_internal((unsigned char *) data, index);
|
|
}
|
|
|
|
STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset)
|
|
{
|
|
return stbtt_InitFont_internal(info, (unsigned char *) data, offset);
|
|
}
|
|
|
|
STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags)
|
|
{
|
|
return stbtt_FindMatchingFont_internal((unsigned char *) fontdata, (char *) name, flags);
|
|
}
|
|
|
|
STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2)
|
|
{
|
|
return stbtt_CompareUTF8toUTF16_bigendian_internal((char *) s1, len1, (char *) s2, len2);
|
|
}
|
|
|
|
#if defined(__GNUC__) || defined(__clang__)
|
|
#pragma GCC diagnostic pop
|
|
#endif
|
|
|
|
#endif // STB_TRUETYPE_IMPLEMENTATION
|
|
|
|
|
|
// FULL VERSION HISTORY
|
|
//
|
|
// 1.12 (2016-10-25) suppress warnings about casting away const with -Wcast-qual
|
|
// 1.11 (2016-04-02) fix unused-variable warning
|
|
// 1.10 (2016-04-02) allow user-defined fabs() replacement
|
|
// fix memory leak if fontsize=0.0
|
|
// fix warning from duplicate typedef
|
|
// 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use alloc userdata for PackFontRanges
|
|
// 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges
|
|
// 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints;
|
|
// allow PackFontRanges to pack and render in separate phases;
|
|
// fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?);
|
|
// fixed an assert() bug in the new rasterizer
|
|
// replace assert() with STBTT_assert() in new rasterizer
|
|
// 1.06 (2015-07-14) performance improvements (~35% faster on x86 and x64 on test machine)
|
|
// also more precise AA rasterizer, except if shapes overlap
|
|
// remove need for STBTT_sort
|
|
// 1.05 (2015-04-15) fix misplaced definitions for STBTT_STATIC
|
|
// 1.04 (2015-04-15) typo in example
|
|
// 1.03 (2015-04-12) STBTT_STATIC, fix memory leak in new packing, various fixes
|
|
// 1.02 (2014-12-10) fix various warnings & compile issues w/ stb_rect_pack, C++
|
|
// 1.01 (2014-12-08) fix subpixel position when oversampling to exactly match
|
|
// non-oversampled; STBTT_POINT_SIZE for packed case only
|
|
// 1.00 (2014-12-06) add new PackBegin etc. API, w/ support for oversampling
|
|
// 0.99 (2014-09-18) fix multiple bugs with subpixel rendering (ryg)
|
|
// 0.9 (2014-08-07) support certain mac/iOS fonts without an MS platformID
|
|
// 0.8b (2014-07-07) fix a warning
|
|
// 0.8 (2014-05-25) fix a few more warnings
|
|
// 0.7 (2013-09-25) bugfix: subpixel glyph bug fixed in 0.5 had come back
|
|
// 0.6c (2012-07-24) improve documentation
|
|
// 0.6b (2012-07-20) fix a few more warnings
|
|
// 0.6 (2012-07-17) fix warnings; added stbtt_ScaleForMappingEmToPixels,
|
|
// stbtt_GetFontBoundingBox, stbtt_IsGlyphEmpty
|
|
// 0.5 (2011-12-09) bugfixes:
|
|
// subpixel glyph renderer computed wrong bounding box
|
|
// first vertex of shape can be off-curve (FreeSans)
|
|
// 0.4b (2011-12-03) fixed an error in the font baking example
|
|
// 0.4 (2011-12-01) kerning, subpixel rendering (tor)
|
|
// bugfixes for:
|
|
// codepoint-to-glyph conversion using table fmt=12
|
|
// codepoint-to-glyph conversion using table fmt=4
|
|
// stbtt_GetBakedQuad with non-square texture (Zer)
|
|
// updated Hello World! sample to use kerning and subpixel
|
|
// fixed some warnings
|
|
// 0.3 (2009-06-24) cmap fmt=12, compound shapes (MM)
|
|
// userdata, malloc-from-userdata, non-zero fill (stb)
|
|
// 0.2 (2009-03-11) Fix unsigned/signed char warnings
|
|
// 0.1 (2009-03-09) First public release
|
|
//
|
|
|