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<?php
namespace Studip\StockImages;
final class Scaler
{
/**
* @param \StockImage $stockImage
*/
public function __invoke(\StockImage $stockImage): void
{
foreach (\StockImage::sizes() as $name => $width) {
if ($name !== \StockImage::SIZE_ORIGINAL) {
$this->scaleToWidth($stockImage, $name, $width);
}
}
}
private function scaleToWidth(\StockImage $stockImage, string $sizeName, int $targetWidth): bool
{
$image = $this->createImage($stockImage);
$width = imagesx($image);
if ($width < $targetWidth) {
return false;
}
$scaledImage = imagescale($image, $targetWidth);
imagedestroy($image);
return $this->storeImage($stockImage, $scaledImage, $sizeName);
}
/**
* @return resource the \GDImage created from the original image file
*/
private function createImage(\StockImage $stockImage)
{
$type = $stockImage->mime_type;
$lookup = [
'image/gif' => 'imagecreatefromgif',
'image/jpeg' => 'imagecreatefromjpeg',
'image/png' => 'imagecreatefrompng',
'image/webp' => 'imagecreatefromwebp',
];
if (!isset($lookup[$type])) {
throw new \RuntimeException(_('Unsupported image type.'));
}
return $lookup[$type]($stockImage->getPath());
}
/**
* @param resource $image the scaled image
*/
private function storeImage(\StockImage $stockImage, $image, string $sizeName): bool
{
$type = $stockImage->mime_type;
$lookup = [
'image/gif' => 'imagegif',
'image/jpeg' => 'imagejpeg',
'image/png' => 'imagepng',
'image/webp' => 'imagewebp',
];
if (!isset($lookup[$type])) {
throw new \RuntimeException(_('Unsupported image type.'));
}
return $lookup[$type]($image, $stockImage->getPath($sizeName));
}
}
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