note 82261 deleted from function.imagerotate by danbrown
| From: | danbrown@php.net | Date: | Tue, 02 Dec 2008 14:57:45 +0000 |
| Subject: | note 82261 deleted from function.imagerotate by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-147530@lists.php.net to get a copy of this message | ||
Note Submitter: Dominik Scholz - info at HAM&SPAM dot go4u dot de
----
I took the previous mentioned code and optimized it a little bit. It does some speed improvements
for me, but I did no exact measurements. Instead of decrementing by 1 in each cycle of the
for-loops, I did the decrementing once before the loops. Maybe further improvements can be made...
<?php
if(!function_exists("imagerotate"))
{
function imagerotate($src_img, $angle)
{
$src_x = imagesx($src_img);
$src_y = imagesy($src_img);
if ($angle == 180)
{
$dest_x = $src_x;
$dest_y = $src_y;
}
elseif (($angle == 90) || ($angle == 270))
{
$dest_x = $src_y;
$dest_y = $src_x;
}
else
{
return $src_img;
}
$rotate=imagecreatetruecolor($dest_x,$dest_y);
imagealphablending($rotate, false);
switch ($angle)
{
case 270:
$dest_x--;
for ($y = 0; $y < $src_y; $y++)
for ($x = 0; $x < $src_x; $x++)
imagesetpixel($rotate, $dest_x - $y, $x, imagecolorat($src_img, $x, $y));
break;
case 90:
$dest_y--;
for ($y = 0; $y < $src_y; $y++)
for ($x = 0; $x < $src_x; $x++)
imagesetpixel($rotate, $y, $dest_y - $x, imagecolorat($src_img, $x, $y));
break;
case 180:
$dest_x--;
$dest_y--;
for ($y = 0; $y < $src_y; $y++)
for ($x = 0; $x < $src_x; $x++)
imagesetpixel($rotate, $dest_x - $x, $dest_y - $y, imagecolorat($src_img,
$x, $y));
break;
}
return $rotate;
}
}
?>