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90 lines
1.5 KiB
C
90 lines
1.5 KiB
C
/*
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* The Python Imaging Library.
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* $Id$
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*
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* decoder for raw (uncompressed) image data
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*
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* history:
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* 96-03-07 fl rewritten
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*
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* Copyright (c) Fredrik Lundh 1996.
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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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*/
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#include "Imaging.h"
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#include "Raw.h"
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int
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ImagingRawDecode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
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{
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enum { LINE = 1, SKIP };
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RAWSTATE* rawstate = state->context;
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UINT8* ptr;
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if (state->state == 0) {
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/* Initialize context variables */
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/* get size of image data and padding */
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state->bytes = (state->xsize * state->bits + 7) / 8;
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rawstate->skip = (rawstate->stride) ?
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rawstate->stride - state->bytes : 0;
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/* check image 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 = LINE;
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}
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ptr = buf;
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for (;;) {
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if (state->state == SKIP) {
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/* Skip padding between lines */
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if (bytes < rawstate->skip)
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return ptr - buf;
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ptr += rawstate->skip;
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bytes -= rawstate->skip;
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state->state = LINE;
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}
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if (bytes < state->bytes)
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return ptr - buf;
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/* Unpack data */
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state->shuffle((UINT8*) im->image[state->y + state->yoff] +
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state->xoff * im->pixelsize, ptr, state->xsize);
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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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/* End of file (errcode = 0) */
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return -1;
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}
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state->state = SKIP;
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}
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}
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