public function normalizeResizeParameters($width, $height, array $params = [])
{
$max_width = (int) elgg_extract('w', $params, 100, false);
$max_height = (int) elgg_extract('h', $params, 100, false);
if (!$max_height || !$max_width) {
throw new \LogicException("Resize width and height parameters are required");
}
$square = elgg_extract('square', $params, false);
$upscale = elgg_extract('upscale', $params, false);
$x1 = (int) elgg_extract('x1', $params, 0);
$y1 = (int) elgg_extract('y1', $params, 0);
$x2 = (int) elgg_extract('x2', $params, 0);
$y2 = (int) elgg_extract('y2', $params, 0);
$cropping_mode = $x1 || $y1 || $x2 || $y2;
if ($cropping_mode) {
$crop_width = $x2 - $x1;
$crop_height = $y2 - $y1;
if ($crop_width <= 0 || $crop_height <= 0 || $crop_width > $width || $crop_height > $height) {
throw new \LogicException("Coordinates [{$x1}, {$y1}], [{$x2}, {$y2}] are invalid for image cropping");
}
} else {
// everything selected if no crop parameters
$crop_width = $width;
$crop_height = $height;
}
// determine cropping offsets
if ($square) {
// asking for a square image back
// detect case where someone is passing crop parameters that are not for a square
if ($cropping_mode == true && $crop_width != $crop_height) {
throw new \LogicException("Coordinates [{$x1}, {$y1}], [{$x2}, {$y2}] are invalid for a squared image cropping");
}
// size of the new square image
$max_width = $max_height = min($max_width, $max_height);
// find largest square that fits within the selected region
$crop_width = $crop_height = min($crop_width, $crop_height);
if (!$cropping_mode) {
// place square region in the center
$x1 = floor(($width - $crop_width) / 2);
$y1 = floor(($height - $crop_height) / 2);
}
} else {
// maintain aspect ratio of original image/crop
if ($crop_height / $max_height > $crop_width / $max_width) {
$max_width = floor($max_height * $crop_width / $crop_height);
} else {
$max_height = floor($max_width * $crop_height / $crop_width);
}
}
if (!$upscale && ($crop_height < $max_height || $crop_width < $max_width)) {
// we cannot upscale and selected area is too small so we decrease size of returned image
$max_height = $crop_height;
$max_width = $crop_width;
}
return ['w' => $max_width, 'h' => $max_height, 'x1' => $x1, 'y1' => $y1, 'x2' => $x1 + $crop_width, 'y2' => $y1 + $crop_height, 'square' => $square, 'upscale' => $upscale];
}
