ext/gd: porting gdImageClone to the bundled libgd version.

ext/gd/libgd/gd.c

@@ -968,6 +968,90 @@ void gdImageAABlend (gdImagePtr im)
 
 static void _gdImageFilledHRectangle (gdImagePtr im, int x1, int y1, int x2, int y2, int color);
 
+gdImagePtr gdImageClone (gdImagePtr src) {
+	gdImagePtr dst;
+	register int i, x;
+
+	if (src->trueColor) {
+		dst = gdImageCreateTrueColor(src->sx , src->sy);
+	} else {
+		dst = gdImageCreate(src->sx , src->sy);
+	}
+
+	if (dst == NULL) {
+		return NULL;
+	}
+
+	if (src->trueColor == 0) {
+		dst->colorsTotal = src->colorsTotal;
+		for (i = 0; i < gdMaxColors; i++) {
+			dst->red[i]   = src->red[i];
+			dst->green[i] = src->green[i];
+			dst->blue[i]  = src->blue[i];
+			dst->alpha[i] = src->alpha[i];
+			dst->open[i]  = src->open[i];
+		}
+		for (i = 0; i < src->sy; i++) {
+			for (x = 0; x < src->sx; x++) {
+				dst->pixels[i][x] = src->pixels[i][x];
+			}
+		}
+	} else {
+		for (i = 0; i < src->sy; i++) {
+			for (x = 0; x < src->sx; x++) {
+				dst->tpixels[i][x] = src->tpixels[i][x];
+			}
+		}
+	}
+
+	dst->interlace   = src->interlace;
+
+	dst->alphaBlendingFlag = src->alphaBlendingFlag;
+	dst->saveAlphaFlag     = src->saveAlphaFlag;
+	dst->AA                = src->AA;
+	dst->AA_color          = src->AA_color;
+	dst->AA_dont_blend     = src->AA_dont_blend;
+
+	dst->cx1 = src->cx1;
+	dst->cy1 = src->cy1;
+	dst->cx2 = src->cx2;
+	dst->cy2 = src->cy2;
+
+	dst->res_x = src->res_x;
+	dst->res_y = src->res_y;
+
+	dst->interpolation_id = src->interpolation_id;
+	dst->interpolation    = src->interpolation;
+
+	if (src->brush) {
+		dst->brush = gdImageClone(src->brush);
+	}
+
+	if (src->tile) {
+		dst->tile = gdImageClone(src->tile);
+	}
+
+	if (src->style) {
+		gdImageSetStyle(dst, src->style, src->styleLength);
+		dst->stylePos = src->stylePos;
+	}
+
+	for (i = 0; i < gdMaxColors; i++) {
+		dst->brushColorMap[i] = src->brushColorMap[i];
+		dst->tileColorMap[i] = src->tileColorMap[i];
+	}
+
+	if (src->polyAllocated > 0 && overflow2(sizeof(int), src->polyAllocated) == 0) {
+		dst->polyInts = gdMalloc (sizeof (int) * src->polyAllocated);
+		dst->polyAllocated = src->polyAllocated;
+		for (i = 0; i < src->polyAllocated; i++) {
+			dst->polyInts[i] = src->polyInts[i];
+		}
+	}
+
+	return dst;
+}
+
 static void gdImageHLine(gdImagePtr im, int y, int x1, int x2, int col)
 {
 	if (im->thick > 1) {

ext/gd/libgd/gd.h

@@ -723,6 +723,8 @@ gdImagePtr gdImageRotate180(gdImagePtr src, int ignoretransparent);
 gdImagePtr gdImageRotate270(gdImagePtr src, int ignoretransparent);
 gdImagePtr gdImageRotateInterpolated(const gdImagePtr src, const float angle, int bgcolor);
 
+gdImagePtr gdImageClone(gdImagePtr src);
+
 void gdImageSetBrush(gdImagePtr im, gdImagePtr brush);
 void gdImageSetTile(gdImagePtr im, gdImagePtr tile);
 void gdImageSetAntiAliased(gdImagePtr im, int c);