fix regression, take #2 (merge issue due to git 1.8 default setting changes)

Author: pierrejoye

ext/gd/gd.c

@@ -2263,7 +2263,7 @@ PHP_FUNCTION(imagerotate)
 
 	ZEND_FETCH_RESOURCE(im_src, gdImagePtr, &SIM, -1, "Image", le_gd);
 
-	im_dst = gdImageRotateGeneric(im_src, (float)degrees, color);
+	im_dst = gdImageRotateInterpolated(im_src, (float)degrees, color);
 
 	if (im_dst != NULL) {
 		ZEND_REGISTER_RESOURCE(return_value, im_dst, le_gd);

ext/gd/libgd/gd.h

@@ -690,6 +690,7 @@ gdImagePtr gdImageRotate180(gdImagePtr src, int ignoretransparent);
 gdImagePtr gdImageRotate270(gdImagePtr src, int ignoretransparent);
 gdImagePtr gdImageRotate45(gdImagePtr src, double dAngle, int clrBack, int ignoretransparent);
 gdImagePtr gdImageRotate (gdImagePtr src, double dAngle, int clrBack, int ignoretransparent);
+gdImagePtr gdImageRotateInterpolated(const gdImagePtr src, const float angle, int bgcolor);
 
 void gdImageSetBrush(gdImagePtr im, gdImagePtr brush);
 void gdImageSetTile(gdImagePtr im, gdImagePtr tile);

ext/gd/libgd/gd_interpolation.c

@@ -2166,6 +2166,10 @@ gdImagePtr gdImageRotateBicubicFixed(gdImagePtr src, const float degrees, const
 gdImagePtr gdImageRotateInterpolated(const gdImagePtr src, const float angle, int bgcolor)
 {
 	const int angle_rounded = (int)floor(angle * 100);
+	
+	if (bgcolor < 0) {
+		return NULL;
+	}
 
 	/* no interpolation needed here */
 	switch (angle_rounded) {