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phab/src/applications/files/transform/PhabricatorImageTransformer.php
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PhabricatorImageTransformer.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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(),
));
}
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);
$scale = min($x / $dx, $y / $dy);
$dst = imagecreatetruecolor($dx, $dy);
// If we need to chop off some pixels, chop them off from the sides instead
// of scaling in on <0, 0>.
$sdx = $scale * $dx;
$sdy = $scale * $dy;
imagecopyresampled(
$dst,
$src,
0, 0,
($x - $sdx) / 2, ($y - $sdy) / 2,
$dx, $dy,
$sdx, $sdy);
return $dst;
}
private function saveImageDataInAnyFormat($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;
}
}
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