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/*
* The Python Imaging Library.
* $Id$
*
* encoder for Xbm data
*
* history:
* 96-11-01 fl created
*
* Copyright (c) Fredrik Lundh 1996.
* Copyright (c) Secret Labs AB 1997.
*
* See the README file for information on usage and redistribution.
*/
#include "Imaging.h"
int
ImagingXbmEncode(Imaging im, ImagingCodecState state, UINT8 *buf, int bytes) {
const char *hex = "0123456789abcdef";
UINT8 *ptr = buf;
int i, n;
if (!state->state) {
/* 8 pixels are stored in no more than 6 bytes */
state->bytes = 6 * (state->xsize + 7) / 8;
state->state = 1;
}
if (bytes < state->bytes) {
state->errcode = IMAGING_CODEC_MEMORY;
return 0;
}
ptr = buf;
while (bytes >= state->bytes) {
state->shuffle(
state->buffer,
(UINT8 *)im->image[state->y + state->yoff] + state->xoff * im->pixelsize,
state->xsize);
if (state->y < state->ysize - 1) {
/* any line but the last */
for (n = 0; n < state->xsize; n += 8) {
i = state->buffer[n / 8];
*ptr++ = '0';
*ptr++ = 'x';
*ptr++ = hex[(i >> 4) & 15];
*ptr++ = hex[i & 15];
*ptr++ = ',';
bytes -= 5;
if (++state->count >= 79 / 5) {
*ptr++ = '\n';
bytes--;
state->count = 0;
}
}
state->y++;
} else {
/* last line */
for (n = 0; n < state->xsize; n += 8) {
i = state->buffer[n / 8];
*ptr++ = '0';
*ptr++ = 'x';
*ptr++ = hex[(i >> 4) & 15];
*ptr++ = hex[i & 15];
if (n < state->xsize - 8) {
*ptr++ = ',';
if (++state->count >= 79 / 5) {
*ptr++ = '\n';
bytes--;
state->count = 0;
}
} else {
*ptr++ = '\n';
}
bytes -= 5;
}
state->errcode = IMAGING_CODEC_END;
break;
}
}
return ptr - buf;
}
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