Description:
------------
When rotating an image which is taller-than-wide through an angle > 225 and <= 315 degrees, only a square portion of the image is copied. The remainder is black.

ext/libgd/gd.c has a bug in gdImageRotate270:

  for (uY = 0; uY<src->sx; uY++) {
    for (uX = 0; uX<src->sx; uX++) {

uY and uX both have a range of src->sx, so only a square region is copied. The first line should be:

  for (uY = 0; uY<src->sy; uY++) {


Reproduce code:
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<script language="PHP">
// June 12, 2003  Tom Robinson
// Display a 30x50 yellow rectangle, rotated 270 degrees CCW.
$im = ImageCreateTrueColor(30,50);
imagefill($im,0,0,16777215-255); 
$im = imagerotate($im,270,255);
header("Content-type: image/png");
imagepng($im);
</script>


Expected result:
----------------
See a yellow rectangle.

Actual result:
--------------
See a rectangle with a yellow square and the rest is black.