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PhabricatorImageTransformer.php
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Tue, Apr 22, 13:56

PhabricatorImageTransformer.php
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<?php
final class PhabricatorImageTransformer {
public function executeMemeTransform(
PhabricatorFile $file,
$upper_text,
$lower_text) {
$image = $this->applyMemeTo($file, $upper_text, $lower_text);
return PhabricatorFile::newFromFileData(
$image,
array(
'name' => 'meme-'.$file->getName(),
));
}
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(),
));
}
public function executeConpherenceTransform(
PhabricatorFile $file,
$top,
$left,
$width,
$height
) {
$image = $this->crasslyCropTo(
$file,
$top,
$left,
$width,
$height
);
return PhabricatorFile::newFromFileData(
$image,
array(
'name' => 'conpherence-'.$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());
}
private function crasslyCropTo(PhabricatorFile $file, $top, $left, $w, $h) {
$data = $file->loadFileData();
$src = imagecreatefromstring($data);
$dst = $this->getBlankDestinationFile($w, $h);
$scale = self::getScaleForCrop($file, $w, $h);
$orig_x = $left / $scale;
$orig_y = $top / $scale;
$orig_w = $w / $scale;
$orig_h = $h / $scale;
imagecopyresampled(
$dst,
$src,
0, 0,
$orig_x, $orig_y,
$w, $h,
$orig_w, $orig_h
);
return $this->saveImageDataInAnyFormat($dst, $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, $file->getMimeType());
}
private function getBlankDestinationFile($dx, $dy) {
$dst = imagecreatetruecolor($dx, $dy);
imagesavealpha($dst, true);
imagefill($dst, 0, 0, imagecolorallocatealpha($dst, 255, 255, 255, 127));
return $dst;
}
private function applyScaleTo($src, $dx, $dy) {
$x = imagesx($src);
$y = imagesy($src);
$scale = min(($dx / $x), ($dy / $y), 1);
$dst = $this->getBlankDestinationFile($dx, $dy);
$sdx = $scale * $x;
$sdy = $scale * $y;
imagecopyresampled(
$dst,
$src,
($dx - $sdx) / 2, ($dy - $sdy) / 2,
0, 0,
$sdx, $sdy,
$x, $y);
return $dst;
}
public static function getPreviewDimensions(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);
$sdx = $scale * $x;
$sdy = $scale * $y;
return array(
'x' => $x,
'y' => $y,
'dx' => $dx,
'dy' => $dy,
'sdx' => $sdx,
'sdy' => $sdy
);
}
public static function getScaleForCrop(
PhabricatorFile $file,
$des_width,
$des_height) {
$metadata = $file->getMetadata();
$width = $metadata[PhabricatorFile::METADATA_IMAGE_WIDTH];
$height = $metadata[PhabricatorFile::METADATA_IMAGE_HEIGHT];
if ($height < $des_height) {
$scale = $height / $des_height;
} else if ($width < $des_width) {
$scale = $width / $des_width;
} else {
$scale_x = $des_width / $width;
$scale_y = $des_height / $height;
$scale = max($scale_x, $scale_y);
}
return $scale;
}
private function generatePreview(PhabricatorFile $file, $size) {
$data = $file->loadFileData();
$src = imagecreatefromstring($data);
$dimensions = self::getPreviewDimensions($file, $size);
$x = $dimensions['x'];
$y = $dimensions['y'];
$dx = $dimensions['dx'];
$dy = $dimensions['dy'];
$sdx = $dimensions['sdx'];
$sdy = $dimensions['sdy'];
$dst = $this->getBlankDestinationFile($dx, $dy);
imagecopyresampled(
$dst,
$src,
($dx - $sdx) / 2, ($dy - $sdy) / 2,
0, 0,
$sdx, $sdy,
$x, $y);
return $this->saveImageDataInAnyFormat($dst, $file->getMimeType());
}
private function applyMemeTo(
PhabricatorFile $file,
$upper_text,
$lower_text) {
$data = $file->loadFileData();
$img = imagecreatefromstring($data);
$phabricator_root = dirname(phutil_get_library_root('phabricator'));
$font_root = $phabricator_root.'/resources/font/';
$font_path = $font_root.'tuffy.ttf';
if (Filesystem::pathExists($font_root.'impact.ttf')) {
$font_path = $font_root.'impact.ttf';
}
$text_color = imagecolorallocate($img, 255, 255, 255);
$border_color = imagecolorallocatealpha($img, 0, 0, 0, 110);
$border_width = 4;
$font_max = 200;
$font_min = 5;
for ($i = $font_max; $i > $font_min; $i--) {
$fit = $this->doesTextBoundingBoxFitInImage(
$img,
$upper_text,
$i,
$font_path);
if ($fit['doesfit']) {
$x = ($fit['imgwidth'] - $fit['txtwidth']) / 2;
$y = $fit['txtheight'] + 10;
$this->makeImageWithTextBorder($img,
$i,
$x,
$y,
$text_color,
$border_color,
$border_width,
$font_path,
$upper_text);
break;
}
}
for ($i = $font_max; $i > $font_min; $i--) {
$fit = $this->doesTextBoundingBoxFitInImage($img,
$lower_text, $i, $font_path);
if ($fit['doesfit']) {
$x = ($fit['imgwidth'] - $fit['txtwidth']) / 2;
$y = $fit['imgheight'] - 10;
$this->makeImageWithTextBorder(
$img,
$i,
$x,
$y,
$text_color,
$border_color,
$border_width,
$font_path,
$lower_text);
break;
}
}
return $this->saveImageDataInAnyFormat($img, $file->getMimeType());
}
private function makeImageWithTextBorder($img, $font_size, $x, $y,
$color, $stroke_color, $bw, $font, $text) {
$angle = 0;
$bw = abs($bw);
for ($c1 = $x - $bw; $c1 <= $x + $bw; $c1++) {
for ($c2 = $y - $bw; $c2 <= $y + $bw; $c2++) {
if (!(($c1 == $x - $bw || $x + $bw) &&
$c2 == $y - $bw || $c2 == $y + $bw)) {
$bg = imagettftext($img, $font_size,
$angle, $c1, $c2, $stroke_color, $font, $text);
}
}
}
imagettftext($img, $font_size, $angle,
$x , $y, $color , $font, $text);
}
private function doesTextBoundingBoxFitInImage($img,
$text, $font_size, $font_path) {
// Default Angle = 0
$angle = 0;
$bbox = imagettfbbox($font_size, $angle, $font_path, $text);
$text_height = abs($bbox[3] - $bbox[5]);
$text_width = abs($bbox[0] - $bbox[2]);
return array(
"doesfit" => ($text_height * 1.05 <= imagesy($img) / 2
&& $text_width * 1.05 <= imagesx($img)),
"txtwidth" => $text_width,
"txtheight" => $text_height,
"imgwidth" => imagesx($img),
"imgheight" => imagesy($img),
);
}
private function saveImageDataInAnyFormat($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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