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132 lines
9.9 KiB
132 lines
9.9 KiB
;* ======================================================================== *;
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;* TEXAS INSTRUMENTS, INC. *;
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;* *;
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;* IMGLIB DSP Image/Video Processing Library *;
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;* *;
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;* Release: Revision 1.04b *;
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;* CVS Revision: 1.4 Sun Sep 29 03:32:18 2002 (UTC) *;
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;* Snapshot date: 23-Oct-2003 *;
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;* *;
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;* This library contains proprietary intellectual property of Texas *;
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;* Instruments, Inc. The library and its source code are protected by *;
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;* various copyrights, and portions may also be protected by patents or *;
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;* other legal protections. *;
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;* *;
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;* This software is licensed for use with Texas Instruments TMS320 *;
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;* family DSPs. This license was provided to you prior to installing *;
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;* the software. You may review this license by consulting the file *;
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;* TI_license.PDF which accompanies the files in this library. *;
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;* ------------------------------------------------------------------------ *;
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;* Copyright (C) 2003 Texas Instruments, Incorporated. *;
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;* All Rights Reserved. *;
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;* ======================================================================== *;
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;* ======================================================================== *;
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;* Assembler compatibility shim for assembling 4.30 and later code on *;
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;* tools prior to 4.30. *;
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;* ======================================================================== *;
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;* ======================================================================== *;
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;* End of assembler compatibility shim. *;
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;* ======================================================================== *;
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* ========================================================================= *
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* *
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* NAME *
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* IMG_boundary -- Returns coordinates of IMG_boundary pixels. *
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* *
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* REVISION DATE *
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* 10-Jul-2001 *
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* *
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* USAGE *
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* This routine is C callable, and is called as follows: *
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* *
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* void IMG_boundary *
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* ( *
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* const unsigned char *restrict i_data, *
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* int rows, int cols, *
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* int *restrict o_coord, *
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* int *restrict o_grey *
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* ); *
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* *
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* The arguments are defined as follows: *
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* *
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* i_data Input images that is cols-by-rows in size. *
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* rows Height of the input image *
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* cols Width of the input image *
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* o_coord Array to write output coordinates to *
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* o_grey Array to write output grey levels to *
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* *
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* DESCRIPTION *
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* This routine scans an image looking for non-zero pixels. *
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* The locations of those pixels are stored out to the o_coord *
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* as packed Y/X pairs, with Y in the upper half, and X in *
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* the lower half. The grey levels encountered are stored *
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* in the o_grey array in parallel. *
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* *
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* The following is a C code description of the kernel without *
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* restrictions. This implementation has restrictions as noted *
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* in the assumptions below. *
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* *
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* void IMG_boundary *
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* ( *
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* const unsigned char *restrict i_data, *
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* int rows, int cols, *
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* int *restrict o_coord, *
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* int *restrict o_grey *
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* ) *
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* { *
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* int x, y, p; *
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* *
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* for (y = 0; y < rows; y++) *
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* for (x = 0; x < cols; x++) *
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* if ((p = i_data[x + y*cols] != 0) *
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* { *
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* *o_coord++ = ((y & 0xFFFF) << 16) | *
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* (x & 0xFFFF); *
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* *o_grey++ = p; *
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* } *
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* } *
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* *
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* ASSUMPTIONS *
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* At least one row is being processed. *
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* *
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* Input is word aligned. *
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* *
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* Input is a multiple of 4 pixels wide. *
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* *
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* Output buffers o_coord and o_grey start in different banks *
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* and are word-aligned. *
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* *
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* No more than 32764 rows or 32764 columns are being processed. *
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* *
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* TECHNIQUES *
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* Outer and inner loops are collapsed together. *
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* Inner loop is unrolled to process four pixels per iteration. *
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* Packed coordinate value is updated directly, rather than *
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* by repacking x, y every time it's needed. *
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* *
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* MEMORY NOTE *
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* No bank conflicts occur as long as o_coord and o_grey start *
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* in different banks. If they start in the same bank, every *
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* access to each array will cause a bank conflict. *
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* *
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* NOTES *
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* This code blocks interrupts for nearly its entire duration. *
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* It is interrupt tolerant, but not interruptible. *
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* *
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* CYCLES *
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* cycles = (5 * rows * cols) / 4 + 12. *
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* *
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* CODESIZE *
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* 132 bytes *
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* ------------------------------------------------------------------------- *
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* Copyright (c) 2003 Texas Instruments, Incorporated. *
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* All Rights Reserved. *
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* ========================================================================= *
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.global _IMG_boundary
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* ========================================================================= *
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* End of file: img_boundary.h64 *
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* ------------------------------------------------------------------------- *
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* Copyright (c) 2003 Texas Instruments, Incorporated. *
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* All Rights Reserved. *
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* ========================================================================= *
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