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phorge-phorge/src/applications/files/PhabricatorImageTransformer.php

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<?php
final class PhabricatorImageTransformer {
public function executeThumbTransform(
PhabricatorFile $file,
$x,
$y) {
$image = $this->crudelyScaleTo($file, $x, $y);
return PhabricatorFile::newFromFileData(
$image,
array(
'name' => 'thumb-'.$file->getName(),
));
}
public function executeProfileTransform(
PhabricatorFile $file,
$x,
$min_y,
$max_y) {
$image = $this->crudelyCropTo($file, $x, $min_y, $max_y);
return PhabricatorFile::newFromFileData(
$image,
array(
'name' => 'profile-'.$file->getName(),
));
}
public function executePreviewTransform(
PhabricatorFile $file,
$size) {
$image = $this->generatePreview($file, $size);
return PhabricatorFile::newFromFileData(
$image,
array(
'name' => 'preview-'.$file->getName(),
));
}
private function crudelyCropTo(PhabricatorFile $file, $x, $min_y, $max_y) {
$data = $file->loadFileData();
$img = imagecreatefromstring($data);
$sx = imagesx($img);
$sy = imagesy($img);
$scaled_y = ($x / $sx) * $sy;
if ($scaled_y > $max_y) {
// This image is very tall and thin.
$scaled_y = $max_y;
} else if ($scaled_y < $min_y) {
// This image is very short and wide.
$scaled_y = $min_y;
}
$img = $this->applyScaleTo(
$img,
$x,
$scaled_y);
return $this->saveImageDataInAnyFormat($img, $file->getMimeType());
}
/**
* Very crudely scale an image up or down to an exact size.
*/
private function crudelyScaleTo(PhabricatorFile $file, $dx, $dy) {
$data = $file->loadFileData();
$src = imagecreatefromstring($data);
$dst = $this->applyScaleTo($src, $dx, $dy);
return $this->saveImageDataInAnyFormat($dst, $file->getMimeType());
}
private function applyScaleTo($src, $dx, $dy) {
$x = imagesx($src);
$y = imagesy($src);
$scale = min(($dx / $x), ($dy / $y), 1);
$dst = imagecreatetruecolor($dx, $dy);
imagesavealpha($dst, true);
imagefill($dst, 0, 0, imagecolorallocatealpha($dst, 255, 255, 255, 127));
$sdx = $scale * $x;
$sdy = $scale * $y;
imagecopyresampled(
$dst,
$src,
($dx - $sdx) / 2, ($dy - $sdy) / 2,
0, 0,
$sdx, $sdy,
$x, $y);
return $dst;
}
private function generatePreview(PhabricatorFile $file, $size) {
$data = $file->loadFileData();
$src = imagecreatefromstring($data);
$x = imagesx($src);
$y = imagesy($src);
$scale = min($size / $x, $size / $y, 1);
$dx = max($size / 4, $scale * $x);
$dy = max($size / 4, $scale * $y);
$dst = imagecreatetruecolor($dx, $dy);
imagesavealpha($dst, true);
imagefill($dst, 0, 0, imagecolorallocatealpha($dst, 255, 255, 255, 127));
$sdx = $scale * $x;
$sdy = $scale * $y;
imagecopyresampled(
$dst,
$src,
($dx - $sdx) / 2, ($dy - $sdy) / 2,
0, 0,
$sdx, $sdy,
$x, $y);
return $this->saveImageDataInAnyFormat($dst, $file->getMimeType());
}
private function saveImageDataInAnyFormat($data, $preferred_mime = '') {
switch ($preferred_mime) {
case 'image/gif': // GIF doesn't support true color.
case 'image/png':
if (function_exists('imagepng')) {
ob_start();
imagepng($data);
return ob_get_clean();
}
break;
}
$img = null;
if (function_exists('imagejpeg')) {
ob_start();
imagejpeg($data);
$img = ob_get_clean();
} else if (function_exists('imagepng')) {
ob_start();
imagepng($data);
$img = ob_get_clean();
} else if (function_exists('imagegif')) {
ob_start();
imagegif($data);
$img = ob_get_clean();
} else {
throw new Exception("No image generation functions exist!");
}
return $img;
}
}