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Bug #24155 imagerotate fail to copy entire source image
Submitted: 2003-06-12 12:23 UTC Modified: 2003-06-12 14:33 UTC
From: tom at gksystems dot com Assigned: iliaa (profile)
Status: Closed Package: GD related
PHP Version: 4.3.2 OS: all
Private report: No CVE-ID: None
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From: tom at gksystems dot com
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 [2003-06-12 12:23 UTC] tom at gksystems dot com
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:
<script language="PHP">
// June 12, 2003  Tom Robinson
// Display a 30x50 yellow rectangle, rotated 270 degrees CCW.
$im = ImageCreateTrueColor(30,50);
$im = imagerotate($im,270,255);
header("Content-type: image/png");

Expected result:
See a yellow rectangle.

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


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 [2003-06-12 14:33 UTC]
This bug has been fixed in CVS.

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