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