/**
* Test {@link crop_to_constraint()}
*/
function test_crop_to_constraint()
{
// 50x50 => 20x20
$this->assertEqual(crop_to_constraint(50, 50, 20, 20), array(0, 0, 50, 50));
}
/**
* Generate a thumbnail
*
* @param resource Image resource
* @param string Thumbnail type ('crop'|'fit')
* @param int Thumbnail width
* @param int Thumbnail height
* @param int Thumbnail percent of blur effect (0 - No blur, 1% - Max blur effect, 99% - Min blur effect)
* @return array short error code + dest image handler
*/
function generate_thumb($src_imh, $thumb_type, $thumb_width, $thumb_height, $thumb_percent_blur = 0)
{
$src_width = imagesx($src_imh);
$src_height = imagesy($src_imh);
if ($src_width <= $thumb_width && $src_height <= $thumb_height) {
// There is no need to resample, use original!
return array(NULL, $src_imh);
}
switch ($thumb_type) {
case 'crop':
case 'crop-top':
$align = $thumb_type == 'crop-top' ? 'top' : 'center';
list($src_x, $src_y, $src_width, $src_height) = crop_to_constraint($src_width, $src_height, $thumb_width, $thumb_height, $align);
$dest_width = $thumb_width;
$dest_height = $thumb_height;
break;
case 'fit':
default:
list($dest_width, $dest_height) = scale_to_constraint($src_width, $src_height, $thumb_width, $thumb_height);
$src_x = $src_y = 0;
}
// pre_dump( $src_x, $src_y, $dest_width, $dest_height, $src_width, $src_height );
// Create a transparent image:
$dest_imh = imagecreatetruecolor($dest_width, $dest_height);
imagealphablending($dest_imh, true);
imagefill($dest_imh, 0, 0, imagecolortransparent($dest_imh, imagecolorallocatealpha($dest_imh, 0, 0, 0, 127)));
imagesavealpha($dest_imh, true);
if (!imagecopyresampled($dest_imh, $src_imh, 0, 0, $src_x, $src_y, $dest_width, $dest_height, $src_width, $src_height)) {
return array('!GD-library internal error (resample)', $dest_imh);
}
if ($thumb_percent_blur > 0) {
// Apply blur effect
$dest_imh = pixelblur($dest_imh, $dest_width, $dest_height, $thumb_percent_blur);
}
// TODO: imageinterlace();
return array(NULL, $dest_imh);
}
