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PhabricatorFileThumbnailTransform.php
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Mon, Nov 25, 20:28

PhabricatorFileThumbnailTransform.php
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<?php
final class PhabricatorFileThumbnailTransform
extends PhabricatorFileImageTransform {
const TRANSFORM_PROFILE = 'profile';
const TRANSFORM_PINBOARD = 'pinboard';
const TRANSFORM_THUMBGRID = 'thumbgrid';
const TRANSFORM_PREVIEW = 'preview';
const TRANSFORM_WORKCARD = 'workcard';
private $name;
private $key;
private $dstX;
private $dstY;
private $scaleUp;
public function setName($name) {
$this->name = $name;
return $this;
}
public function setKey($key) {
$this->key = $key;
return $this;
}
public function setDimensions($x, $y) {
$this->dstX = $x;
$this->dstY = $y;
return $this;
}
public function setScaleUp($scale) {
$this->scaleUp = $scale;
return $this;
}
public function getTransformName() {
return $this->name;
}
public function getTransformKey() {
return $this->key;
}
protected function getFileProperties() {
$properties = array();
switch ($this->key) {
case self::TRANSFORM_PROFILE:
$properties['profile'] = true;
$properties['name'] = 'profile';
break;
}
return $properties;
}
public function generateTransforms() {
return array(
id(new PhabricatorFileThumbnailTransform())
->setName(pht("Profile (400px \xC3\x97 400px)"))
->setKey(self::TRANSFORM_PROFILE)
->setDimensions(400, 400)
->setScaleUp(true),
id(new PhabricatorFileThumbnailTransform())
->setName(pht("Pinboard (280px \xC3\x97 210px)"))
->setKey(self::TRANSFORM_PINBOARD)
->setDimensions(280, 210),
id(new PhabricatorFileThumbnailTransform())
->setName(pht('Thumbgrid (100px)'))
->setKey(self::TRANSFORM_THUMBGRID)
->setDimensions(100, null),
id(new PhabricatorFileThumbnailTransform())
->setName(pht('Preview (220px)'))
->setKey(self::TRANSFORM_PREVIEW)
->setDimensions(220, null),
id(new self())
->setName(pht('Workcard (526px)'))
->setKey(self::TRANSFORM_WORKCARD)
->setScaleUp(true)
->setDimensions(526, null),
);
}
public function applyTransform(PhabricatorFile $file) {
$this->willTransformFile($file);
list($src_x, $src_y) = $this->getImageDimensions();
$dst_x = $this->dstX;
$dst_y = $this->dstY;
$dimensions = $this->computeDimensions(
$src_x,
$src_y,
$dst_x,
$dst_y);
$copy_x = $dimensions['copy_x'];
$copy_y = $dimensions['copy_y'];
$use_x = $dimensions['use_x'];
$use_y = $dimensions['use_y'];
$dst_x = $dimensions['dst_x'];
$dst_y = $dimensions['dst_y'];
return $this->applyCropAndScale(
$dst_x,
$dst_y,
($src_x - $copy_x) / 2,
($src_y - $copy_y) / 2,
$copy_x,
$copy_y,
$use_x,
$use_y,
$this->scaleUp);
}
public function getTransformedDimensions(PhabricatorFile $file) {
$dst_x = $this->dstX;
$dst_y = $this->dstY;
// If this is transform has fixed dimensions, we can trivially predict
// the dimensions of the transformed file.
if ($dst_y !== null) {
return array($dst_x, $dst_y);
}
$src_x = $file->getImageWidth();
$src_y = $file->getImageHeight();
if (!$src_x || !$src_y) {
return null;
}
$dimensions = $this->computeDimensions(
$src_x,
$src_y,
$dst_x,
$dst_y);
return array($dimensions['dst_x'], $dimensions['dst_y']);
}
private function computeDimensions($src_x, $src_y, $dst_x, $dst_y) {
if ($dst_y === null) {
// If we only have one dimension, it represents a maximum dimension.
// The other dimension of the transform is scaled appropriately, except
// that we never generate images with crazily extreme aspect ratios.
if ($src_x < $src_y) {
// This is a tall, narrow image. Use the maximum dimension for the
// height and scale the width.
$use_y = $dst_x;
$dst_y = $dst_x;
$use_x = $dst_y * ($src_x / $src_y);
$dst_x = max($dst_y / 4, $use_x);
} else {
// This is a short, wide image. Use the maximum dimension for the width
// and scale the height.
$use_x = $dst_x;
$use_y = $dst_x * ($src_y / $src_x);
$dst_y = max($dst_x / 4, $use_y);
}
// In this mode, we always copy the entire source image. We may generate
// margins in the output.
$copy_x = $src_x;
$copy_y = $src_y;
} else {
$scale_up = $this->scaleUp;
// Otherwise, both dimensions are fixed. Figure out how much we'd have to
// scale the image down along each dimension to get the entire thing to
// fit.
$scale_x = ($dst_x / $src_x);
$scale_y = ($dst_y / $src_y);
if (!$scale_up) {
$scale_x = min($scale_x, 1);
$scale_y = min($scale_y, 1);
}
if ($scale_x > $scale_y) {
// This image is relatively tall and narrow. We're going to crop off the
// top and bottom.
$scale = $scale_x;
} else {
// This image is relatively short and wide. We're going to crop off the
// left and right.
$scale = $scale_y;
}
$copy_x = $dst_x / $scale;
$copy_y = $dst_y / $scale;
if (!$scale_up) {
$copy_x = min($src_x, $copy_x);
$copy_y = min($src_y, $copy_y);
}
// In this mode, we always use the entire destination image. We may
// crop the source input.
$use_x = $dst_x;
$use_y = $dst_y;
}
return array(
'copy_x' => $copy_x,
'copy_y' => $copy_y,
'use_x' => $use_x,
'use_y' => $use_y,
'dst_x' => $dst_x,
'dst_y' => $dst_y,
);
}
public function getDefaultTransform(PhabricatorFile $file) {
$x = (int)$this->dstX;
$y = (int)$this->dstY;
$name = 'image-'.$x.'x'.nonempty($y, $x).'.png';
$root = dirname(phutil_get_library_root('phabricator'));
$data = Filesystem::readFile($root.'/resources/builtin/'.$name);
return $this->newFileFromData($data);
}
}

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