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Differential D19201 Diff 45988 src/applications/macro/engine/PhabricatorMemeEngine.php

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src/applications/macro/engine/PhabricatorMemeEngine.php

<?php <?php
final class PhabricatorMemeEngine extends Phobject { final class PhabricatorMemeEngine extends Phobject {
private $viewer; private $viewer;
private $template; private $template;
private $aboveText; private $aboveText;
private $belowText; private $belowText;
private $templateFile; private $templateFile;
private $metrics;
public function setViewer(PhabricatorUser $viewer) { public function setViewer(PhabricatorUser $viewer) {
$this->viewer = $viewer; $this->viewer = $viewer;
return $this; return $this;
} }
public function getViewer() { public function getViewer() {
return $this->viewer; return $this->viewer;
▲ Show 20 Lines • Show All 44 Lines • ▼ Show 20 Lines if (!$template) {
throw new Exception( throw new Exception(
pht( pht(
'Template "%s" is not a valid template.', 'Template "%s" is not a valid template.',
$template)); $template));
} }
$hash = $this->newTransformHash(); $hash = $this->newTransformHash();
$transformer = new PhabricatorImageTransformer(); $asset = $this->newAssetFile($template);
$asset = $transformer->executeMemeTransform(
$template,
$this->getAboveText(),
$this->getBelowText());
$xfile = id(new PhabricatorTransformedFile()) $xfile = id(new PhabricatorTransformedFile())
->setOriginalPHID($template->getPHID()) ->setOriginalPHID($template->getPHID())
->setTransformedPHID($asset->getPHID()) ->setTransformedPHID($asset->getPHID())
->setTransform($hash); ->setTransform($hash);
try { try {
$caught = null; $caught = null;
▲ Show 20 Lines • Show All 71 Lines • ▼ Show 20 Lines if ($this->templateFile === null) {
} }
$this->templateFile = $macro->getFile(); $this->templateFile = $macro->getFile();
} }
return $this->templateFile; return $this->templateFile;
} }
private function newAssetFile(PhabricatorFile $template) {
$data = $this->newAssetData($template);
return PhabricatorFile::newFromFileData(
$data,
array(
'name' => 'meme-'.$template->getName(),
'ttl.relative' => phutil_units('24 hours in seconds'),
'canCDN' => true,
));
}
private function newAssetData(PhabricatorFile $template) {
$template_data = $template->loadFileData();
$result = $this->newImagemagickAsset($template, $template_data);
if ($result) {
return $result;
}
return $this->newGDAsset($template, $template_data);
}
private function newImagemagickAsset(
PhabricatorFile $template,
$template_data) {
// We're only going to use Imagemagick on GIFs.
$mime_type = $template->getMimeType();
if ($mime_type != 'image/gif') {
return null;
}
// We're only going to use Imagemagick if it is actually available.
$available = PhabricatorEnv::getEnvConfig('files.enable-imagemagick');
if (!$available) {
return null;
}
// Test of the GIF is an animated GIF. If it's a flat GIF, we'll fall
// back to GD.
$input = new TempFile();
Filesystem::writeFile($input, $template_data);
list($err, $out) = exec_manual('convert %s info:', $input);
if ($err) {
return null;
}
$split = phutil_split_lines($out);
$frames = count($split);
if ($frames <= 1) {
return null;
}
// Split the frames apart, transform each frame, then merge them back
// together.
$output = new TempFile();
$future = new ExecFuture(
'convert %s -coalesce +adjoin %s_%s',
$input,
$input,
'%09d');
$future->setTimeout(10)->resolvex();
$output_files = array();
for ($ii = 0; $ii < $frames; $ii++) {
$frame_name = sprintf('%s_%09d', $input, $ii);
$output_name = sprintf('%s_%09d', $output, $ii);
$output_files[] = $output_name;
$frame_data = Filesystem::readFile($frame_name);
$memed_frame_data = $this->newGDAsset($template, $frame_data);
Filesystem::writeFile($output_name, $memed_frame_data);
}
$future = new ExecFuture('convert -loop 0 %Ls %s', $output_files, $output);
$future->setTimeout(10)->resolvex();
return Filesystem::readFile($output);
}
private function newGDAsset(PhabricatorFile $template, $data) {
$img = imagecreatefromstring($data);
if (!$img) {
throw new Exception(
pht('Failed to imagecreatefromstring() image template data.'));
}
$dx = imagesx($img);
$dy = imagesy($img);
$metrics = $this->getMetrics($dx, $dy);
$font = $this->getFont();
$size = $metrics['size'];
$above = $this->getAboveText();
if (strlen($above)) {
$x = (int)floor(($dx - $metrics['text']['above']['width']) / 2);
$y = $metrics['text']['above']['height'] + 12;
$this->drawText($img, $font, $metrics['size'], $x, $y, $above);
}
$below = $this->getBelowText();
if (strlen($below)) {
$x = (int)floor(($dx - $metrics['text']['below']['width']) / 2);
$y = $dy - 12 - $metrics['text']['below']['descend'];
$this->drawText($img, $font, $metrics['size'], $x, $y, $below);
}
return PhabricatorImageTransformer::saveImageDataInAnyFormat(
$img,
$template->getMimeType());
}
private function getFont() {
$phabricator_root = dirname(phutil_get_library_root('phabricator'));
$font_root = $phabricator_root.'/resources/font/';
if (Filesystem::pathExists($font_root.'impact.ttf')) {
$font_path = $font_root.'impact.ttf';
} else {
$font_path = $font_root.'tuffy.ttf';
}
return $font_path;
}
private function getMetrics($dim_x, $dim_y) {
if ($this->metrics === null) {
$font = $this->getFont();
$font_max = 72;
$font_min = 5;
$last = null;
$cursor = floor(($font_max + $font_min) / 2);
$min = $font_min;
$max = $font_max;
$texts = array(
'above' => $this->getAboveText(),
'below' => $this->getBelowText(),
);
$metrics = null;
$best = null;
while (true) {
$all_fit = true;
$text_metrics = array();
foreach ($texts as $key => $text) {
$box = imagettfbbox($cursor, 0, $font, $text);
$height = abs($box[3] - $box[5]);
$width = abs($box[0] - $box[2]);
// This is the number of pixels below the baseline that the
// text extends, for example if it has a "y".
$descend = $box[3];
if ($height > $dim_y) {
$all_fit = false;
break;
}
if ($width > $dim_x) {
$all_fit = false;
break;
}
$text_metrics[$key]['width'] = $width;
$text_metrics[$key]['height'] = $height;
$text_metrics[$key]['descend'] = $descend;
}
if ($all_fit || $best === null) {
$best = $cursor;
$metrics = $text_metrics;
}
if ($all_fit) {
$min = $cursor;
} else {
$max = $cursor;
}
$last = $cursor;
$cursor = floor(($max + $min) / 2);
if ($cursor === $last) {
break;
}
}
$this->metrics = array(
'size' => $best,
'text' => $metrics,
);
}
return $this->metrics;
}
private function drawText($img, $font, $size, $x, $y, $text) {
$text_color = imagecolorallocate($img, 255, 255, 255);
$border_color = imagecolorallocate($img, 0, 0, 0);
$border = 2;
for ($xx = ($x - $border); $xx <= ($x + $border); $xx += $border) {
for ($yy = ($y - $border); $yy <= ($y + $border); $yy += $border) {
if (($xx === $x) && ($yy === $y)) {
continue;
}
imagettftext($img, $size, 0, $xx, $yy, $border_color, $font, $text);
}
}
imagettftext($img, $size, 0, $x, $y, $text_color, $font, $text);
}
} }
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