78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
/*
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* The Python Imaging Library.
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* $Id: PcdDecode.c 2134 2004-10-06 08:55:20Z fredrik $
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*
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* decoder for uncompressed PCD image data.
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*
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* history:
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* 96-05-10 fl Created
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* 96-05-18 fl New tables
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* 97-01-25 fl Use PhotoYCC unpacker
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*
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* notes:
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* This driver supports uncompressed PCD modes only
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* (resolutions up to 768x512).
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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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*/
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#include "Imaging.h"
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int
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ImagingPcdDecode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
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{
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int x;
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int chunk;
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UINT8* out;
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UINT8* ptr;
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ptr = buf;
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chunk = 3 * state->xsize;
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for (;;) {
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/* We need data for two full lines before we can do anything */
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if (bytes < chunk)
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return ptr - buf;
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/* Unpack first line */
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out = state->buffer;
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for (x = 0; x < state->xsize; x++) {
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out[0] = ptr[x];
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out[1] = ptr[(x+4*state->xsize)/2];
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out[2] = ptr[(x+5*state->xsize)/2];
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out += 4;
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}
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state->shuffle((UINT8*) im->image[state->y],
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state->buffer, state->xsize);
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if (++state->y >= state->ysize)
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return -1; /* This can hardly happen */
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/* Unpack second line */
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out = state->buffer;
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for (x = 0; x < state->xsize; x++) {
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out[0] = ptr[x+state->xsize];
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out[1] = ptr[(x+4*state->xsize)/2];
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out[2] = ptr[(x+5*state->xsize)/2];
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out += 4;
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}
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state->shuffle((UINT8*) im->image[state->y],
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state->buffer, state->xsize);
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if (++state->y >= state->ysize)
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return -1;
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ptr += chunk;
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bytes -= chunk;
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}
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}
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