photo driver abstraction

1 files changed, 137 insertions, 0 deletions

diff --git a/include/photo/photo_gd.php b/include/photo/photo_gd.php
new file mode 100644
index 000000000..a32bd2816
--- /dev/null
+++ b/include/photo/photo_gd.php
@@ -0,0 +1,137 @@
+<?php /** @file */
+
+
+require_once('include/photo/photo_driver.php');
+
+
+class photo_gd extends photo_driver {
+
+	function supportedTypes() {
+		$t = array();
+		$t['image/jpeg'] ='jpg';
+		if (imagetypes() & IMG_PNG) $t['image/png'] = 'png';
+
+		return $t;
+
+	}
+
+	function load($data, $type) {
+		$this->valid = false;
+		$this->image = @imagecreatefromstring($data);
+		if($this->image !== FALSE) {
+			$this->valid  = true;
+			$this->setDimensions();
+			imagealphablending($this->image, false);
+			imagesavealpha($this->image, true);
+		}
+	}
+
+	function setDimensions() {
+		$this->width  = imagesx($this->image);
+		$this->height = imagesy($this->image);
+	}
+
+
+	public function destroy() {
+		if($this->is_valid()) {
+			imagedestroy($this->image);
+		}
+	}
+
+	public function getImage() {
+		if(!$this->is_valid())
+			return FALSE;
+
+		return $this->image;
+	}
+
+	public function doScaleImage($dest_width,$dest_height) {
+
+		$dest = imagecreatetruecolor( $dest_width, $dest_height );
+		$width = imagesx($this->image);
+		$height = imagesy($this->image);
+
+		imagealphablending($dest, false);
+		imagesavealpha($dest, true);
+		if ($this->type=='image/png') imagefill($dest, 0, 0, imagecolorallocatealpha($dest, 0, 0, 0, 127)); // fill with alpha
+		imagecopyresampled($dest, $this->image, 0, 0, 0, 0, $dest_width, $dest_height, $width, $height);
+		if($this->image)
+			imagedestroy($this->image);
+		$this->image = $dest;
+		$this->setDimensions();
+	}
+
+	public function rotate($degrees) {
+		if(!$this->is_valid())
+			return FALSE;
+
+		$this->image  = imagerotate($this->image,$degrees,0);
+		$this->setDimensions();
+	}
+
+	public function flip($horiz = true, $vert = false) {
+		if(!$this->is_valid())
+			return FALSE;
+
+		$w = imagesx($this->image);
+		$h = imagesy($this->image);
+		$flipped = imagecreate($w, $h);
+		if($horiz) {
+			for ($x = 0; $x < $w; $x++) {
+				imagecopy($flipped, $this->image, $x, 0, $w - $x - 1, 0, 1, $h);
+			}
+		}
+		if($vert) {
+			for ($y = 0; $y < $h; $y++) {
+				imagecopy($flipped, $this->image, 0, $y, 0, $h - $y - 1, $w, 1);
+			}
+		}
+		$this->image = $flipped;
+		$this->setDimensions(); // Shouldn't really be necessary
+	}
+
+	public function cropImage($max,$x,$y,$w,$h) {
+		if(!$this->is_valid())
+			return FALSE;
+
+		$dest = imagecreatetruecolor( $max, $max );
+		imagealphablending($dest, false);
+		imagesavealpha($dest, true);
+		if ($this->type=='image/png') imagefill($dest, 0, 0, imagecolorallocatealpha($dest, 0, 0, 0, 127)); // fill with alpha
+		imagecopyresampled($dest, $this->image, 0, 0, $x, $y, $max, $max, $w, $h);
+		if($this->image)
+			imagedestroy($this->image);
+		$this->image = $dest;
+		$this->setDimensions();
+	}
+
+	public function imageString() {
+		if(!$this->is_valid())
+			return FALSE;
+
+		$quality = FALSE;
+
+		ob_start();
+
+		switch($this->getType()){
+			case "image/png":
+				$quality = get_config('system','png_quality');
+				if((! $quality) || ($quality > 9))
+					$quality = PNG_QUALITY;
+				imagepng($this->image,NULL, $quality);
+				break;
+			case "image/jpeg":
+			default:
+				$quality = get_config('system','jpeg_quality');
+				if((! $quality) || ($quality > 100))
+					$quality = JPEG_QUALITY;
+				imagejpeg($this->image,NULL,$quality);
+				break;
+		}
+		$string = ob_get_contents();
+		ob_end_clean();
+
+		return $string;
+	}
+
+}
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