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90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
/*
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* The Python Imaging Library.
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* $Id$
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*
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* coder for raw data
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*
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* FIXME: This encoder will fail if the buffer is not large enough to
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* hold one full line of data. There's a workaround for this problem
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* in ImageFile.py, but it should be solved here instead.
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*
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* history:
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* 96-04-30 fl created
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* 97-01-03 fl fixed padding
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*
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* Copyright (c) Fredrik Lundh 1996-97.
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* Copyright (c) Secret Labs AB 1997.
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*
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* See the README file for information on usage and redistribution. */
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#include "Imaging.h"
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int
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ImagingRawEncode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
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{
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UINT8* ptr;
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if (!state->state) {
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/* The "count" field holds the stride, if specified. Fix
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things up so "bytes" is the full size, and "count" the
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packed size */
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if (state->count > 0) {
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int bytes = state->count;
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/* stride must not be less than real size */
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if (state->count < state->bytes) {
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state->errcode = IMAGING_CODEC_CONFIG;
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return -1;
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}
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state->count = state->bytes;
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state->bytes = bytes;
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} else
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state->count = state->bytes;
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/* The "ystep" field specifies the orientation */
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if (state->ystep < 0) {
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state->y = state->ysize-1;
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state->ystep = -1;
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} else
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state->ystep = 1;
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state->state = 1;
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}
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if (bytes < state->bytes) {
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state->errcode = IMAGING_CODEC_CONFIG;
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return 0;
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}
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ptr = buf;
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while (bytes >= state->bytes) {
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state->shuffle(ptr, (UINT8*) im->image[state->y + state->yoff] +
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state->xoff * im->pixelsize, state->xsize);
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if (state->bytes > state->count)
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/* zero-pad the buffer, if necessary */
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memset(ptr + state->count, 0, state->bytes - state->count);
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ptr += state->bytes;
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bytes -= state->bytes;
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state->y += state->ystep;
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if (state->y < 0 || state->y >= state->ysize) {
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state->errcode = IMAGING_CODEC_END;
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break;
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}
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}
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return ptr - buf;
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}
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