photo driver abstraction

1 files changed, 173 insertions, 0 deletions

diff --git a/include/photo/photo_imagick.php b/include/photo/photo_imagick.php
new file mode 100644
index 000000000..7282898b4
--- /dev/null
+++ b/include/photo/photo_imagick.php
@@ -0,0 +1,173 @@
+<?php /** @file */
+
+
+require_once('include/photo/photo_driver.php');
+
+
+class photo_imagick extends photo_driver {
+
+
+	function supportedTypes() {
+		return array(
+			'image/jpeg' => 'jpg',
+			'image/png' => 'png',
+			'image/gif' => 'gif'
+		);
+	}
+
+	public function get_FormatsMap() {
+		return array(
+			'image/jpeg' => 'JPG',
+			'image/png' => 'PNG',
+			'image/gif' => 'GIF'
+		);
+	}
+
+
+	function load($data, $type) {
+		$this->valid = false;
+		$this->image = new Imagick();
+		$this->image->readImageBlob($data);
+
+
+		/**
+		 * Setup the image to the format it will be saved to
+		 */
+
+		$map = $this->get_FormatsMap();
+		$format = $map[$type];
+
+		if($this->image) {
+			$this->image->setFormat($format);
+
+			// Always coalesce, if it is not a multi-frame image it won't hurt anyway
+			$this->image = $this->image->coalesceImages();
+
+
+			$this->valid = true;
+			$this->setDimensions();
+
+			/**
+			 * setup the compression here, so we'll do it only once
+			 */
+			switch($this->getType()) {
+				case "image/png":
+					$quality = get_config('system','png_quality');
+					if((! $quality) || ($quality > 9))
+						$quality = PNG_QUALITY;
+					/**
+					 * From http://www.imagemagick.org/script/command-line-options.php#quality:
+					 *
+					 * 'For the MNG and PNG image formats, the quality value sets
+					 * the zlib compression level (quality / 10) and filter-type (quality % 10).
+					 * The default PNG "quality" is 75, which means compression level 7 with adaptive PNG filtering,
+					 * unless the image has a color map, in which case it means compression level 7 with no PNG filtering'
+					 */
+					$quality = $quality * 10;
+					$this->image->setCompressionQuality($quality);
+					break;
+				case "image/jpeg":
+					$quality = get_config('system','jpeg_quality');
+					if((! $quality) || ($quality > 100))
+						$quality = JPEG_QUALITY;
+					$this->image->setCompressionQuality($quality);
+
+				default:
+					break;
+			}
+		}
+	}
+
+	public function destroy() {
+		if($this->is_valid()) {
+			$this->image->clear();
+			$this->image->destroy();
+		}
+	}
+
+
+	public function setDimensions() {
+		$this->width = $this->image->getImageWidth();
+		$this->height = $this->image->getImageHeight();
+	}
+
+
+	public function getImage() {
+		if(!$this->is_valid())
+			return FALSE;
+
+		$this->image = $this->image->deconstructImages();
+		return $this->image;
+	}
+
+	public function doScaleImage($dest_width,$dest_height) {
+
+		/**
+		 * If it is not animated, there will be only one iteration here,
+		 * so don't bother checking
+		 */
+		// Don't forget to go back to the first frame
+		$this->image->setFirstIterator();
+		do {
+			$this->image->scaleImage($dest_width, $dest_height);
+		} while ($this->image->nextImage());
+
+		$this->setDimensions();
+	}
+
+	public function rotate($degrees) {
+		if(!$this->is_valid())
+			return FALSE;
+
+		$this->image->setFirstIterator();
+		do {
+			// ImageMagick rotates in the opposite direction of imagerotate()
+			$this->image->rotateImage(new ImagickPixel(), -$degrees); 
+		} while ($this->image->nextImage());
+
+		$this->setDimensions();
+	}
+
+	public function flip($horiz = true, $vert = false) {
+		if(!$this->is_valid())
+			return FALSE;
+
+		$this->image->setFirstIterator();
+		do {
+			if($horiz) $this->image->flipImage();
+			if($vert) $this->image->flopImage();
+		} while ($this->image->nextImage());
+
+		$this->setDimensions(); // Shouldn't really be necessary
+	}
+
+	public function cropImage($max,$x,$y,$w,$h) {
+		if(!$this->is_valid())
+			return FALSE;
+
+		$this->image->setFirstIterator();
+		do {
+			$this->image->cropImage($w, $h, $x, $y);
+			/**
+			 * We need to remove the canva,
+			 * or the image is not resized to the crop:
+			 * http://php.net/manual/en/imagick.cropimage.php#97232
+			 */
+			$this->image->setImagePage(0, 0, 0, 0);
+		} while ($this->image->nextImage());
+
+		$this->doScaleImage($max);
+	}
+
+	public function imageString() {
+		if(!$this->is_valid())
+			return FALSE;
+
+		/* Clean it */
+		$this->image = $this->image->deconstructImages();
+		return $this->image->getImagesBlob();
+	}
+
+
+
+}
\ No newline at end of file