silverstripe-framework/filesystem/GDBackend.php

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<?php
use SilverStripe\Filesystem\Storage\AssetContainer;
use SilverStripe\Filesystem\Storage\AssetStore;
/**
* A wrapper class for GD-based images, with lots of manipulation functions.
* @package framework
* @subpackage filesystem
*/
class GDBackend extends Object implements Image_Backend, Flushable {
/**
* GD Resource
*
* @var resource
*/
protected $gd;
/**
* @var Zend_Cache_Core
*/
protected $cache;
/**
* @var int
*/
protected $width;
/**
* @var height
*/
protected $height;
/**
* @var int
*/
protected $quality;
/**
*
* @var int
*/
protected $interlace;
/**
* @config
* @var integer
*/
private static $default_quality = 75;
/**
* @config
* @var integer
*/
private static $image_interlace = 0;
public function __construct(AssetContainer $assetContainer = null) {
parent::__construct();
$this->cache = SS_Cache::factory('GDBackend_Manipulations');
if($assetContainer) {
$this->loadFromContainer($assetContainer);
}
}
public function loadFrom($path) {
// If we're working with image resampling, things could take a while. Bump up the time-limit
increase_time_limit_to(300);
$this->resetResource();
// Skip if path is unavailable
if(!file_exists($path)) {
return;
}
$mtime = filemtime($path);
// Skip if load failed before
if($this->failedResample($path, $mtime)) {
return;
}
// We use getimagesize instead of extension checking, because sometimes extensions are wrong.
$meta = getimagesize($path);
if($meta === false) {
$this->markFailed($path, $mtime);
return;
}
$gd = null;
switch($meta[2]) {
case 1:
if(function_exists('imagecreatefromgif')) {
$gd = imagecreatefromgif($path);
}
break;
case 2:
if(function_exists('imagecreatefromjpeg')) {
$gd = imagecreatefromjpeg($path);
}
break;
case 3:
if(function_exists('imagecreatefrompng')) {
$gd = imagecreatefrompng($path);
if($gd) {
imagesavealpha($gd, true); // save alphablending setting (important)
}
}
break;
}
// image failed
if($gd === false) {
$this->markFailed($path, $mtime);
return;
}
// Save
$this->setImageResource($gd);
}
public function loadFromContainer(AssetContainer $assetContainer) {
// If we're working with image resampling, things could take a while. Bump up the time-limit
increase_time_limit_to(300);
$this->resetResource();
// Skip non-existant files
if(!$assetContainer->exists()) {
return;
}
// Skip if failed before
$filename = $assetContainer->getFilename();
$hash = $assetContainer->getHash();
$variant = $assetContainer->getVariant();
if($this->failedResample($filename, $hash, $variant)) {
return;
}
// Mark as potentially failed prior to creation, resetting this on success
$content = $assetContainer->getString();
$image = imagecreatefromstring($content);
if($image === false) {
$this->markFailed($filename, $hash, $variant);
return;
}
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imagealphablending($image, false);
imagesavealpha($image, true); // save alphablending setting (important)
$this->setImageResource($image);
}
/**
* Clear GD resource
*/
protected function resetResource(){
// Set defaults and clear resource
$this->setImageResource(null);
$this->quality = $this->config()->default_quality;
$this->interlace = $this->config()->image_interlace;
}
/**
* Assign or clear GD resource
*
* @param resource|null $resource
*/
public function setImageResource($resource) {
$this->gd = $resource;
$this->width = $resource ? imagesx($resource) : 0;
$this->height = $resource ? imagesy($resource) : 0;
}
/**
* Get the currently assigned GD resource
*
* @return resource
*/
public function getImageResource() {
return $this->gd;
}
/**
* Check if this image has previously crashed GD when attempting to open it - if it's opened
* successfully, the manipulation's cache key is removed.
*
* @param string $args,... Any number of args that identify this image
* @return bool True if failed
*/
public function failedResample() {
$key = sha1(implode('|', func_get_args()));
return (bool)$this->cache->load($key);
}
/**
* Mark a file as failed
*
* @param string $args,... Any number of args that identify this image
*/
protected function markFailed() {
$key = sha1(implode('|', func_get_args()));
$this->cache->save('1', $key);
}
/**
* Mark a file as succeeded
*
* @param string $args,... Any number of args that identify this image
*/
protected function markSucceeded() {
$key = sha1(implode('|', func_get_args()));
$this->cache->save('0', $key);
}
public function setQuality($quality) {
$this->quality = $quality;
}
public function croppedResize($width, $height) {
if(!$this->gd) {
return null;
}
$width = round($width);
$height = round($height);
// Check that a resize is actually necessary.
if ($width == $this->width && $height == $this->height) {
return $this;
}
$newGD = imagecreatetruecolor($width, $height);
// Preserves transparency between images
imagealphablending($newGD, false);
imagesavealpha($newGD, true);
$destAR = $width / $height;
if ($this->width > 0 && $this->height > 0 ){
// We can't divide by zero theres something wrong.
$srcAR = $this->width / $this->height;
// Destination narrower than the source
if($destAR < $srcAR) {
$srcY = 0;
$srcHeight = $this->height;
$srcWidth = round( $this->height * $destAR );
$srcX = round( ($this->width - $srcWidth) / 2 );
// Destination shorter than the source
} else {
$srcX = 0;
$srcWidth = $this->width;
$srcHeight = round( $this->width / $destAR );
$srcY = round( ($this->height - $srcHeight) / 2 );
}
imagecopyresampled($newGD, $this->gd, 0,0, $srcX, $srcY, $width, $height, $srcWidth, $srcHeight);
}
$output = clone $this;
$output->setImageResource($newGD);
return $output;
}
/**
* Resizes the image to fit within the given region.
* Behaves similarly to paddedResize but without the padding.
* @todo This method isn't very efficent
*/
public function fittedResize($width, $height) {
$gd = $this->resizeByHeight($height);
if($gd->width > $width) {
$gd = $gd->resizeByWidth($width);
}
return $gd;
}
public function resize($width, $height) {
if(!$this->gd) {
return null;
}
if($width < 0 || $height < 0) {
throw new InvalidArgumentException("Image resizing dimensions cannot be negative");
}
if(!$width && !$height) {
throw new InvalidArgumentException("No dimensions given when resizing image");
}
if(!$width) {
throw new InvalidArgumentException("Width not given when resizing image");
}
if(!$height) {
throw new InvalidArgumentException("Height not given when resizing image");
}
//use whole numbers, ensuring that size is at least 1x1
$width = max(1, round($width));
$height = max(1, round($height));
// Check that a resize is actually necessary.
if ($width == $this->width && $height == $this->height) {
return $this;
}
$newGD = imagecreatetruecolor($width, $height);
// Preserves transparency between images
imagealphablending($newGD, false);
imagesavealpha($newGD, true);
imagecopyresampled($newGD, $this->gd, 0,0, 0, 0, $width, $height, $this->width, $this->height);
$output = clone $this;
$output->setImageResource($newGD);
return $output;
}
/**
* Rotates image by given angle.
*
* @param float angle Angle in degrees
* @return static
*/
public function rotate($angle) {
if(!$this->gd) {
return null;
}
if(function_exists("imagerotate")) {
$newGD = imagerotate($this->gd, $angle, 0);
} else {
//imagerotate is not included in PHP included in Ubuntu
$newGD = $this->rotatePixelByPixel($angle);
}
$output = clone $this;
$output->setImageResource($newGD);
return $output;
}
/**
* Rotates image by given angle. It's slow because makes it pixel by pixel rather than
* using built-in function. Used when imagerotate function is not available(i.e. Ubuntu)
*
* @param float $angle Angle in degrees
* @return static
*/
public function rotatePixelByPixel($angle) {
if(!$this->gd) {
return null;
}
$sourceWidth = imagesx($this->gd);
$sourceHeight = imagesy($this->gd);
if ($angle == 180) {
$destWidth = $sourceWidth;
$destHeight = $sourceHeight;
} else {
$destWidth = $sourceHeight;
$destHeight = $sourceWidth;
}
$rotate=imagecreatetruecolor($destWidth,$destHeight);
imagealphablending($rotate, false);
for ($x = 0; $x < ($sourceWidth); $x++) {
for ($y = 0; $y < ($sourceHeight); $y++) {
$color = imagecolorat($this->gd, $x, $y);
switch ($angle) {
case 90:
imagesetpixel($rotate, $y, $destHeight - $x - 1, $color);
break;
case 180:
imagesetpixel($rotate, $destWidth - $x - 1, $destHeight - $y - 1, $color);
break;
case 270:
imagesetpixel($rotate, $destWidth - $y - 1, $x, $color);
break;
default: $rotate = $this->gd;
};
}
}
return $rotate;
}
/**
* Crop's part of image.
*
* @param int $top y position of left upper corner of crop rectangle
* @param int $left x position of left upper corner of crop rectangle
* @param int $width rectangle width
* @param int $height rectangle height
* @return static
*/
public function crop($top, $left, $width, $height) {
if(!$this->gd) {
return null;
}
$newGD = imagecreatetruecolor($width, $height);
// Preserve alpha channel between images
imagealphablending($newGD, false);
imagesavealpha($newGD, true);
imagecopyresampled($newGD, $this->gd, 0, 0, $left, $top, $width, $height, $width, $height);
$output = clone $this;
$output->setImageResource($newGD);
return $output;
}
/**
* Width of image.
*
* @return int
*/
public function getWidth() {
return $this->width;
}
/**
* Height of image.
*
* @return int
*/
public function getHeight() {
return $this->height;
}
public function resizeByWidth($width) {
$heightScale = $width / $this->width;
return $this->resize($width, $heightScale * $this->height );
}
public function resizeByHeight($height) {
$scale = $height / $this->height;
return $this->resize($scale * $this->width, $height );
}
public function resizeRatio($maxWidth, $maxHeight, $useAsMinimum = false) {
$widthRatio = $maxWidth / $this->width;
$heightRatio = $maxHeight / $this->height;
if( $widthRatio < $heightRatio ) {
return $useAsMinimum
? $this->resizeByHeight( $maxHeight )
: $this->resizeByWidth( $maxWidth );
} else {
return $useAsMinimum
? $this->resizeByWidth( $maxWidth )
: $this->resizeByHeight( $maxHeight );
}
}
public function paddedResize($width, $height, $backgroundColor = "FFFFFF") {
if(!$this->gd) {
return null;
}
$width = round($width);
$height = round($height);
// Check that a resize is actually necessary.
if ($width == $this->width && $height == $this->height) {
return $this;
}
$newGD = imagecreatetruecolor($width, $height);
// Preserves transparency between images
imagealphablending($newGD, false);
imagesavealpha($newGD, true);
$bg = $this->colourWeb2GD($newGD, $backgroundColor);
imagefilledrectangle($newGD, 0, 0, $width, $height, $bg);
$destAR = $width / $height;
if ($this->width > 0 && $this->height > 0) {
// We can't divide by zero theres something wrong.
$srcAR = $this->width / $this->height;
// Destination narrower than the source
if($destAR > $srcAR) {
$destY = 0;
$destHeight = $height;
$destWidth = round( $height * $srcAR );
$destX = round( ($width - $destWidth) / 2 );
// Destination shorter than the source
} else {
$destX = 0;
$destWidth = $width;
$destHeight = round( $width / $srcAR );
$destY = round( ($height - $destHeight) / 2 );
}
imagecopyresampled($newGD, $this->gd,
$destX, $destY, 0, 0,
$destWidth, $destHeight, $this->width, $this->height);
}
$output = clone $this;
$output->setImageResource($newGD);
return $output;
}
/**
* Make the image greyscale
* $rv = red value, defaults to 38
* $gv = green value, defaults to 36
* $bv = blue value, defaults to 26
* Based (more or less entirely, with changes for readability) on code from
* http://www.teckis.com/scriptix/thumbnails/teck.html
*/
public function greyscale($rv=38, $gv=36, $bv=26) {
if(!$this->gd) {
return null;
}
$width = $this->width;
$height = $this->height;
$newGD = imagecreatetruecolor($this->width, $this->height);
// Preserves transparency between images
imagealphablending($newGD, false);
imagesavealpha($newGD, true);
$rt = $rv + $bv + $gv;
$rr = ($rv == 0) ? 0 : 1/($rt/$rv);
$br = ($bv == 0) ? 0 : 1/($rt/$bv);
$gr = ($gv == 0) ? 0 : 1/($rt/$gv);
for($dy = 0; $dy < $height; $dy++) {
for($dx = 0; $dx < $width; $dx++) {
$pxrgb = imagecolorat($this->gd, $dx, $dy);
$heightgb = ImageColorsforIndex($this->gd, $pxrgb);
$newcol = ($rr*$heightgb['red']) + ($br*$heightgb['blue']) + ($gr*$heightgb['green']);
$setcol = ImageColorAllocateAlpha($newGD, $newcol, $newcol, $newcol, $heightgb['alpha']);
imagesetpixel($newGD, $dx, $dy, $setcol);
}
}
$output = clone $this;
$output->setImageResource($newGD);
return $output;
}
public function writeToStore(AssetStore $assetStore, $filename, $hash = null, $variant = null, $config = array()) {
// Write to temporary file, taking care to maintain the extension
$path = tempnam(sys_get_temp_dir(), 'gd');
if($extension = pathinfo($filename, PATHINFO_EXTENSION)) {
$path .= "." . $extension;
}
$this->writeTo($path);
$result = $assetStore->setFromLocalFile($path, $filename, $hash, $variant, $config);
unlink($path);
return $result;
}
public function writeTo($filename) {
if(!$filename) {
return;
}
// Get current image data
if(file_exists($filename)) {
list($width, $height, $type, $attr) = getimagesize($filename);
unlink($filename);
} else {
Filesystem::makeFolder(dirname($filename));
}
// If image type isn't known, guess from extension
$ext = strtolower(substr($filename, strrpos($filename,'.')+1));
if(empty($type)) {
switch($ext) {
case "gif":
$type = IMAGETYPE_GIF;
break;
case "jpeg":
case "jpg":
case "jpe":
$type = IMAGETYPE_JPEG;
break;
default:
$type = IMAGETYPE_PNG;
break;
}
}
// if $this->interlace != 0, the output image will be interlaced
imageinterlace ($this->gd, $this->interlace);
// if the extension does not exist, the file will not be created!
switch($type) {
case IMAGETYPE_GIF:
imagegif($this->gd, $filename);
break;
case IMAGETYPE_JPEG:
imagejpeg($this->gd, $filename, $this->quality);
break;
// case 3, and everything else
default:
// Save them as 8-bit images
// imagetruecolortopalette($this->gd, false, 256);
imagepng($this->gd, $filename);
break;
}
if(file_exists($filename)) {
@chmod($filename, 0664);
}
}
/**
* Helper function to allocate a colour to an image
*
* @param resource $image
* @param string $webColor
* @return int
*/
protected function colourWeb2GD($image, $webColor) {
if(substr($webColor,0,1) == "#") {
$webColor = substr($webColor, 1);
}
$r = hexdec(substr($webColor,0,2));
$g = hexdec(substr($webColor,2,2));
$b = hexdec(substr($webColor,4,2));
return imagecolorallocate($image, $r, $g, $b);
}
public static function flush() {
// Clear factory
$cache = SS_Cache::factory('GDBackend_Manipulations');
$cache->clean(Zend_Cache::CLEANING_MODE_ALL);
}
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}