/**
* Test {@link scale_to_constraint()}
*/
function test_scale_to_constraint()
{
$this->assertEqual(scale_to_constraint(50, 50, 20, 20), array(20, 20));
$this->assertEqual(scale_to_constraint(50, 100, 100, 10), array(5, 10));
// Tests with NULL
$this->assertEqual(scale_to_constraint(50, 70, 50, NULL), array(50, 70));
$this->assertEqual(scale_to_constraint(50, 70, 25, NULL), array(25, 35));
$this->assertEqual(scale_to_constraint(50, 70, NULL, 35), array(25, 35));
$this->assertEqual(scale_to_constraint(50, 70, NULL, NULL), array(50, 70));
}
/**
* Generate a thumbnail
*
* @return array short error code + dest image handler
*/
function generate_thumb($src_imh, $thumb_width, $thumb_height)
{
$src_width = imagesx($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, $src_imh);
}
list($dest_width, $dest_height) = scale_to_constraint($src_width, $src_height, $thumb_width, $thumb_height);
// pre_dump( $src_width, $src_height, $dest_width, $dest_height );
$dest_imh = imagecreatetruecolor($dest_width, $dest_height);
// Create a black image
if (!imagecopyresampled($dest_imh, $src_imh, 0, 0, 0, 0, $dest_width, $dest_height, $src_width, $src_height)) {
return array('!GD-library internal error (resample)', $dest_imh);
}
// TODO: imageinterlace();
return array(NULL, $dest_imh);
}
/**
* Generate a thumbnail
*
* @param resource Image resource
* @param string Thumbnail type ('crop'|'fit')
* @param int Thumbnail width
* @param int Thumbnail height
* @param int Thumbnail percent of blur effect (0 - No blur, 1% - Max blur effect, 99% - Min blur effect)
* @return array short error code + dest image handler
*/
function generate_thumb($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, $dest_imh);
}
/**
* Calculate what sizes are used for thumbnail really
*
* @param string Thumbnail size name
* @return boolean|array FALSE on wrong size name OR Array with keys: 0 - width, 1 - height
*/
function get_thumb_size($size_name = 'fit-80x80')
{
global $thumbnail_sizes;
if (!isset($thumbnail_sizes[$size_name])) {
// Wrong thumbnail size name
return false;
}
$thumb_type = $thumbnail_sizes[$size_name][0];
$thumb_width = $thumbnail_sizes[$size_name][1];
$thumb_height = $thumbnail_sizes[$size_name][2];
load_funcs('files/model/_image.funcs.php');
list($orig_width, $orig_height) = $this->get_image_size('widthheight');
if (check_thumbnail_sizes($thumb_type, $thumb_width, $thumb_height, $orig_width, $orig_height)) {
// Use the sizes of the original image
$width = $orig_width;
$height = $orig_height;
} else {
// Calculate the sizes depending on thumbnail type
if ($thumb_type == 'fit') {
list($width, $height) = scale_to_constraint($orig_width, $orig_height, $thumb_width, $thumb_height);
} else {
// crop & crop-top
$width = $thumb_width;
$height = $thumb_height;
}
}
return array($width, $height);
}
