1 #include "gd.h" 2 #include "gdhelpers.h" 3 4 #include "gd_intern.h" 5 #include "php.h" 6 7 /* bring the palette colors in im2 to be closer to im1 8 * 9 */ gdImageColorMatch(gdImagePtr im1,gdImagePtr im2)10int gdImageColorMatch (gdImagePtr im1, gdImagePtr im2) 11 { 12 unsigned long *buf; /* stores our calculations */ 13 unsigned long *bp; /* buf ptr */ 14 int color, rgb; 15 int x,y; 16 int count; 17 18 if( !im1->trueColor ) { 19 return -1; /* im1 must be True Color */ 20 } 21 if( im2->trueColor ) { 22 return -2; /* im2 must be indexed */ 23 } 24 if( (im1->sx != im2->sx) || (im1->sy != im2->sy) ) { 25 return -3; /* the images are meant to be the same dimensions */ 26 } 27 if (im2->colorsTotal<1) { 28 return -4; /* At least 1 color must be allocated */ 29 } 30 31 buf = (unsigned long *)safe_emalloc(sizeof(unsigned long), 5 * gdMaxColors, 0); 32 memset( buf, 0, sizeof(unsigned long) * 5 * gdMaxColors ); 33 34 for (x=0; x<im1->sx; x++) { 35 for( y=0; y<im1->sy; y++ ) { 36 color = im2->pixels[y][x]; 37 rgb = im1->tpixels[y][x]; 38 bp = buf + (color * 5); 39 (*(bp++))++; 40 *(bp++) += gdTrueColorGetRed(rgb); 41 *(bp++) += gdTrueColorGetGreen(rgb); 42 *(bp++) += gdTrueColorGetBlue(rgb); 43 *(bp++) += gdTrueColorGetAlpha(rgb); 44 } 45 } 46 bp = buf; 47 for (color=0; color<im2->colorsTotal; color++) { 48 count = *(bp++); 49 if( count > 0 ) { 50 im2->red[color] = *(bp++) / count; 51 im2->green[color] = *(bp++) / count; 52 im2->blue[color] = *(bp++) / count; 53 im2->alpha[color] = *(bp++) / count; 54 } else { 55 bp += 4; 56 } 57 } 58 gdFree(buf); 59 return 0; 60 } 61 62 63
