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107 lines
1.7 KiB
C
107 lines
1.7 KiB
C
/*
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* The Python Imaging Library.
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* $Id$
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*
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* encoder for Xbm data
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*
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* history:
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* 96-11-01 fl created
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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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int
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ImagingXbmEncode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
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{
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const char *hex = "0123456789abcdef";
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UINT8* ptr = buf;
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int i, n;
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if (!state->state) {
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/* 8 pixels are stored in no more than 6 bytes */
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state->bytes = 6*(state->xsize+7)/8;
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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_MEMORY;
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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(state->buffer,
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(UINT8*) im->image[state->y + state->yoff] +
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state->xoff * im->pixelsize, state->xsize);
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if (state->y < state->ysize-1) {
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/* any line but the last */
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for (n = 0; n < state->xsize; n += 8) {
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i = state->buffer[n/8];
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*ptr++ = '0';
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*ptr++ = 'x';
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*ptr++ = hex[(i>>4)&15];
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*ptr++ = hex[i&15];
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*ptr++ = ',';
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bytes -= 5;
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if (++state->count >= 79/5) {
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*ptr++ = '\n';
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bytes--;
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state->count = 0;
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}
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}
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state->y++;
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} else {
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/* last line */
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for (n = 0; n < state->xsize; n += 8) {
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i = state->buffer[n/8];
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*ptr++ = '0';
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*ptr++ = 'x';
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*ptr++ = hex[(i>>4)&15];
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*ptr++ = hex[i&15];
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if (n < state->xsize-8) {
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*ptr++ = ',';
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if (++state->count >= 79/5) {
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*ptr++ = '\n';
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bytes--;
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state->count = 0;
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}
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} else
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*ptr++ = '\n';
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bytes -= 5;
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}
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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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