63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "gd.h"
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#include "gdhelpers.h"
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/*
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Function: gdImageColorMatch
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Bring the palette colors in im2 to be closer to im1.
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*/
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BGD_DECLARE(int) gdImageColorMatch (gdImagePtr im1, gdImagePtr im2)
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{
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unsigned long *buf; /* stores our calculations */
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unsigned long *bp; /* buf ptr */
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int color, rgb;
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int x,y;
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int count;
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if (!im1->trueColor) {
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return -1; /* im1 must be True Color */
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}
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if (im2->trueColor) {
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return -2; /* im2 must be indexed */
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}
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if ((im1->sx != im2->sx) || (im1->sy != im2->sy)) {
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return -3; /* the images are meant to be the same dimensions */
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}
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if (im2->colorsTotal < 1) {
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return -4; /* At least 1 color must be allocated */
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}
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buf = (unsigned long *)gdMalloc(sizeof(unsigned long) * 5 * gdMaxColors);
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memset (buf, 0, sizeof(unsigned long) * 5 * gdMaxColors );
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for (x=0; x < im1->sx; x++) {
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for( y=0; y<im1->sy; y++ ) {
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color = im2->pixels[y][x];
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rgb = im1->tpixels[y][x];
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bp = buf + (color * 5);
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(*(bp++))++;
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*(bp++) += gdTrueColorGetRed(rgb);
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*(bp++) += gdTrueColorGetGreen(rgb);
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*(bp++) += gdTrueColorGetBlue(rgb);
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*(bp++) += gdTrueColorGetAlpha(rgb);
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}
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}
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bp = buf;
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for (color=0; color < im2->colorsTotal; color++) {
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count = *(bp++);
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if( count > 0 ) {
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im2->red[color] = *(bp++) / count;
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im2->green[color] = *(bp++) / count;
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im2->blue[color] = *(bp++) / count;
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im2->alpha[color] = *(bp++) / count;
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} else {
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bp += 4;
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}
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}
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gdFree(buf);
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return 0;
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}
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