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#include "gd.h"
int gdImagePixelate(gdImagePtr im, int block_size, const unsigned int mode)
{
int x, y;
if (block_size <= 0) {
return 0;
} else if (block_size == 1) {
return 1;
}
switch (mode) {
case GD_PIXELATE_UPPERLEFT:
for (y = 0; y < im->sy; y += block_size) {
for (x = 0; x < im->sx; x += block_size) {
if (gdImageBoundsSafe(im, x, y)) {
int c = gdImageGetPixel(im, x, y);
gdImageFilledRectangle(im, x, y, x + block_size - 1, y + block_size - 1, c);
}
}
}
break;
case GD_PIXELATE_AVERAGE:
for (y = 0; y < im->sy; y += block_size) {
for (x = 0; x < im->sx; x += block_size) {
int a, r, g, b, c;
int total;
int cx, cy;
a = r = g = b = c = total = 0;
/* sampling */
for (cy = 0; cy < block_size; cy++) {
for (cx = 0; cx < block_size; cx++) {
if (!gdImageBoundsSafe(im, x + cx, y + cy)) {
continue;
}
c = gdImageGetPixel(im, x + cx, y + cy);
a += gdImageAlpha(im, c);
r += gdImageRed(im, c);
g += gdImageGreen(im, c);
b += gdImageBlue(im, c);
total++;
}
}
/* drawing */
if (total > 0) {
c = gdImageColorResolveAlpha(im, r / total, g / total, b / total, a / total);
gdImageFilledRectangle(im, x, y, x + block_size - 1, y + block_size - 1, c);
}
}
}
break;
default:
return 0;
}
return 1;
}