1 files changed, 57 insertions, 0 deletions
diff --git a/ext/gd/libgd/gd_pixelate.c b/ext/gd/libgd/gd_pixelate.c
new file mode 100644
index 0000000..3808a6e
--- /dev/null
+++ b/ext/gd/libgd/gd_pixelate.c
@@ -0,0 +1,57 @@
+#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;
+}