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