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<?php |
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namespace Elgg; |
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use Exception; |
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use Imagine\Image\Box; |
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use Imagine\Image\ImagineInterface; |
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use Imagine\Image\Point; |
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use Elgg\Filesystem\MimeTypeDetector; |
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/** |
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* Image manipulation service |
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* |
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* @since 2.3 |
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* @access private |
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*/ |
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class ImageService { |
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const JPEG_QUALITY = 75; |
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/** |
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* @var ImagineInterface |
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*/ |
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private $imagine; |
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/** |
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* @var Config |
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*/ |
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private $config; |
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/** |
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* Constructor |
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* |
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* @param ImagineInterface $imagine Imagine interface |
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* @param Config $config Elgg config |
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*/ |
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public function __construct(ImagineInterface $imagine, Config $config) { |
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$this->imagine = $imagine; |
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$this->config = $config; |
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} |
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/** |
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* Crop and resize an image |
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* |
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* @param string $source Path to source image |
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* @param string $destination Path to destination |
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* If not set, will modify the source image |
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* @param array $params An array of cropping/resizing parameters |
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* - INT 'w' represents the width of the new image |
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* With upscaling disabled, this is the maximum width |
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* of the new image (in case the source image is |
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* smaller than the expected width) |
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* - INT 'h' represents the height of the new image |
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* With upscaling disabled, this is the maximum height |
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* - INT 'x1', 'y1', 'x2', 'y2' represent optional cropping |
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* coordinates. The source image will first be cropped |
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* to these coordinates, and then resized to match |
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* width/height parameters |
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* - BOOL 'square' - square images will fill the |
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* bounding box (width x height). In Imagine's terms, |
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* this equates to OUTBOUND mode |
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* - BOOL 'upscale' - if enabled, smaller images |
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* will be upscaled to fit the bounding box. |
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* @return bool |
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*/ |
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public function resize($source, $destination = null, array $params = []) { |
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if (!isset($destination)) { |
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$destination = $source; |
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} |
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try { |
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$image = $this->imagine->open($source); |
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$width = $image->getSize()->getWidth(); |
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$height = $image->getSize()->getHeight(); |
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$resize_params = $this->normalizeResizeParameters($width, $height, $params); |
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$max_width = elgg_extract('w', $resize_params); |
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$max_height = elgg_extract('h', $resize_params); |
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$x1 = (int) elgg_extract('x1', $resize_params, 0); |
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$y1 = (int) elgg_extract('y1', $resize_params, 0); |
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$x2 = (int) elgg_extract('x2', $resize_params, 0); |
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$y2 = (int) elgg_extract('y2', $resize_params, 0); |
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if ($x2 > $x1 && $y2 > $y1) { |
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$crop_start = new Point($x1, $y1); |
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$crop_size = new Box($x2 - $x1, $y2 - $y1); |
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$image->crop($crop_start, $crop_size); |
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} |
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$target_size = new Box($max_width, $max_height); |
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$thumbnail = $image->resize($target_size); |
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$thumbnail->save($destination, [ |
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'jpeg_quality' => elgg_extract('jpeg_quality', $params, self::JPEG_QUALITY), |
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'format' => $this->getFileFormat($source, $params), |
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]); |
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unset($image); |
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unset($thumbnail); |
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} catch (Exception $ex) { |
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_elgg_services()->logger->error($ex->getMessage()); |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Calculate the parameters for resizing an image |
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* |
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* @param int $width Natural width of the image |
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* @param int $height Natural height of the image |
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* @param array $params Resize parameters |
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* - 'w' maximum width of the resized image |
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* - 'h' maximum height of the resized image |
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* - 'upscale' allow upscaling |
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* - 'square' constrain to a square |
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* - 'x1', 'y1', 'x2', 'y2' cropping coordinates |
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* |
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* @return array |
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* @throws \LogicException |
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*/ |
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public function normalizeResizeParameters($width, $height, array $params = []) { |
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$max_width = (int) elgg_extract('w', $params, 100, false); |
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$max_height = (int) elgg_extract('h', $params, 100, false); |
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if (!$max_height || !$max_width) { |
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throw new \LogicException("Resize width and height parameters are required"); |
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} |
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$square = elgg_extract('square', $params, false); |
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$upscale = elgg_extract('upscale', $params, false); |
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$x1 = (int) elgg_extract('x1', $params, 0); |
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$y1 = (int) elgg_extract('y1', $params, 0); |
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$x2 = (int) elgg_extract('x2', $params, 0); |
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$y2 = (int) elgg_extract('y2', $params, 0); |
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$cropping_mode = $x1 || $y1 || $x2 || $y2; |
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if ($cropping_mode) { |
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$crop_width = $x2 - $x1; |
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$crop_height = $y2 - $y1; |
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if ($crop_width <= 0 || $crop_height <= 0 || $crop_width > $width || $crop_height > $height) { |
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throw new \LogicException("Coordinates [$x1, $y1], [$x2, $y2] are invalid for image cropping"); |
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} |
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} else { |
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// everything selected if no crop parameters |
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$crop_width = $width; |
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$crop_height = $height; |
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} |
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// determine cropping offsets |
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if ($square) { |
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// asking for a square image back |
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// detect case where someone is passing crop parameters that are not for a square |
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if ($cropping_mode == true && $crop_width != $crop_height) { |
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throw new \LogicException("Coordinates [$x1, $y1], [$x2, $y2] are invalid for a squared image cropping"); |
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} |
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// size of the new square image |
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$max_width = $max_height = min($max_width, $max_height); |
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// find largest square that fits within the selected region |
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$crop_width = $crop_height = min($crop_width, $crop_height); |
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if (!$cropping_mode) { |
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// place square region in the center |
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$x1 = floor(($width - $crop_width) / 2); |
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$y1 = floor(($height - $crop_height) / 2); |
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} |
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} else { |
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// maintain aspect ratio of original image/crop |
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if ($crop_height / $max_height > $crop_width / $max_width) { |
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$max_width = floor($max_height * $crop_width / $crop_height); |
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} else { |
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$max_height = floor($max_width * $crop_height / $crop_width); |
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} |
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} |
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if (!$upscale && ($crop_height < $max_height || $crop_width < $max_width)) { |
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// we cannot upscale and selected area is too small so we decrease size of returned image |
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$max_height = $crop_height; |
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$max_width = $crop_width; |
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} |
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return [ |
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'w' => $max_width, |
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'h' => $max_height, |
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'x1' => $x1, |
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'y1' => $y1, |
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'x2' => $x1 + $crop_width, |
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'y2' => $y1 + $crop_height, |
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'square' => $square, |
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'upscale' => $upscale, |
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]; |
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} |
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/** |
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* Determine the image file format, this is needed for correct resizing |
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* |
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* @param string $filename path to the file |
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* @param array $params array of resizing params (can contain 'format' to set save format) |
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* |
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* @see https://github.com/Elgg/Elgg/issues/10686 |
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* @return void|string |
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*/ |
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protected function getFileFormat($filename, $params) { |
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$accepted_formats = [ |
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'image/jpeg' => 'jpeg', |
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'image/pjpeg' => 'jpeg', |
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'image/png' => 'png', |
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'image/x-png' => 'png', |
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'image/gif' => 'gif', |
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'image/vnd.wap.wbmp' => 'wbmp', |
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'image/x‑xbitmap' => 'xbm', |
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'image/x‑xbm' => 'xbm', |
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]; |
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// was a valid output format supplied |
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$format = elgg_extract('format', $params); |
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if (in_array($format, $accepted_formats)) { |
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return $format; |
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} |
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$mime_detector = new MimeTypeDetector(); |
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$mime = $mime_detector->getType($filename); |
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return elgg_extract($mime, $accepted_formats); |
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} |
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} |
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Elgg /
Elgg
