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authorFlorian Pritz <bluewind@xinu.at>2015-03-02 12:14:58 +0100
committerFlorian Pritz <bluewind@xinu.at>2015-03-02 12:14:58 +0100
commite9e9e635b337dc46111cdf95ccb16b7d28deb849 (patch)
treec69c6e12c48f71306cf54640b24b8c133f793090 /application/libraries/Image/Drivers/GD.php
parentea8471781ee26f79c3835e68b31353601e78d0a8 (diff)
Add imagemagick support
Adds additional support for imagemagick if GD doesn't support a file type and extends the files displayed as thumbnails to all images and pdf files. Signed-off-by: Florian Pritz <bluewind@xinu.at>
Diffstat (limited to 'application/libraries/Image/Drivers/GD.php')
-rw-r--r--application/libraries/Image/Drivers/GD.php226
1 files changed, 226 insertions, 0 deletions
diff --git a/application/libraries/Image/Drivers/GD.php b/application/libraries/Image/Drivers/GD.php
new file mode 100644
index 000000000..5c6411ced
--- /dev/null
+++ b/application/libraries/Image/Drivers/GD.php
@@ -0,0 +1,226 @@
+<?php
+/*
+ * Copyright 2014-2015 Florian "Bluewind" Pritz <bluewind@server-speed.net>
+ *
+ * Licensed under AGPLv3
+ * (see COPYING for full license text)
+ *
+ */
+
+namespace libraries\Image\Drivers;
+
+class GD implements \libraries\Image\ImageDriver {
+ private $img;
+ private $source_type;
+ private $exif;
+
+ public static function get_priority($mimetype)
+ {
+ switch($mimetype) {
+ case "image/jpeg":
+ case "image/png":
+ case "image/gif":
+ return 1000;
+ break;
+ default:
+ return -1;
+ break;
+ }
+ }
+
+ /**
+ * Create a new object and load the contents of file.
+ * @param file file to read
+ */
+ public function __construct($file)
+ {
+ $this->read($file);
+ }
+
+ public function read($file)
+ {
+ $img = imagecreatefromstring(file_get_contents($file));
+ if ($img === false) {
+ throw new \exceptions\ApiException("libraries/Image/unsupported-image-type", "Unsupported image type");
+ }
+ $this->set_img_object($img);
+ $this->fix_alpha();
+
+ $this->source_type = getimagesize($file)[2];
+ $this->exif = \libraries\Exif::get_exif($file);
+ }
+
+ public function get($target_type = null)
+ {
+ if ($target_type === null) {
+ $target_type = $this->source_type;
+ }
+
+ ob_start();
+ switch ($target_type) {
+ case IMAGETYPE_GIF:
+ $ret = imagegif($this->img);
+ break;
+ case IMAGETYPE_JPEG:
+ $ret = imagejpeg($this->img);
+ break;
+ case IMAGETYPE_PNG:
+ $ret = imagepng($this->img);
+ break;
+ default:
+ assert(0);
+ }
+ $result = ob_get_clean();
+
+ if (!$ret || $result === false) {
+ throw new \exceptions\ApiException("libraries/Image/thumbnail-creation-failed", "Failed to create thumbnail");
+ }
+
+ return $result;
+ }
+
+ public function resize($width, $height)
+ {
+ $temp_gdim = imagecreatetruecolor($width, $height);
+ $this->fix_alpha();
+ imagecopyresampled(
+ $temp_gdim,
+ $this->img,
+ 0, 0,
+ 0, 0,
+ $width, $height,
+ imagesx($this->img), imagesy($this->img)
+ );
+
+ $this->set_img_object($temp_gdim);
+ }
+
+ public function crop($x, $y, $width, $height)
+ {
+ $thumb = imagecreatetruecolor($width, $height);
+ $this->fix_alpha();
+ imagecopy(
+ $thumb,
+ $this->img,
+ 0, 0,
+ $x, $y,
+ $width, $height
+ );
+
+ $this->set_img_object($thumb);
+ }
+
+ // Source: http://salman-w.blogspot.co.at/2009/04/crop-to-fit-image-using-aspphp.html
+ public function makeThumb($target_width, $target_height)
+ {
+ $source_aspect_ratio = imagesx($this->img) / imagesy($this->img);
+ $desired_aspect_ratio = $target_width / $target_height;
+
+ if ($source_aspect_ratio > $desired_aspect_ratio) {
+ // Triggered when source image is wider
+ $temp_height = $target_height;
+ $temp_width = round(($target_height * $source_aspect_ratio));
+ } else {
+ // Triggered otherwise (i.e. source image is similar or taller)
+ $temp_width = $target_width;
+ $temp_height = round(($target_width / $source_aspect_ratio));
+ }
+
+ $this->resize($temp_width, $temp_height);
+
+ $x0 = ($temp_width - $target_width) / 2;
+ $y0 = ($temp_height - $target_height) / 2;
+ $this->crop($x0, $y0, $target_width, $target_height);
+
+ $this->apply_exif_orientation();
+ }
+
+ static public function get_exif_orientation($file)
+ {
+ $exif = \libraries\Exif::get_exif($file);
+ if (isset($exif["Orientation"])) {
+ return $exif["Orientation"];
+ }
+ return 0;
+ }
+
+ public function apply_exif_orientation()
+ {
+ if (isset($this->exif['Orientation'])) {
+ $mirror = false;
+ $deg = 0;
+
+ switch ($this->exif['Orientation']) {
+ case 2:
+ $mirror = true;
+ break;
+ case 3:
+ $deg = 180;
+ break;
+ case 4:
+ $deg = 180;
+ $mirror = true;
+ break;
+ case 5:
+ $deg = 270;
+ $mirror = true;
+ break;
+ case 6:
+ $deg = 270;
+ break;
+ case 7:
+ $deg = 90;
+ $mirror = true;
+ break;
+ case 8:
+ $deg = 90;
+ break;
+ }
+
+ if ($deg) {
+ $this->set_img_object(imagerotate($this->img, $deg, 0));
+ }
+
+ if ($mirror) {
+ $this->mirror();
+ }
+ }
+ }
+
+ public function mirror()
+ {
+ $width = imagesx($this->img);
+ $height = imagesy($this->img);
+
+ $src_x = $width -1;
+ $src_y = 0;
+ $src_width = -$width;
+ $src_height = $height;
+
+ $imgdest = imagecreatetruecolor($width, $height);
+ imagealphablending($imgdest,false);
+ imagesavealpha($imgdest,true);
+
+ imagecopyresampled($imgdest, $this->img, 0, 0, $src_x, $src_y, $width, $height, $src_width, $src_height);
+ $this->set_img_object($imgdest);
+ }
+
+ private function set_img_object($new)
+ {
+ assert($new !== false);
+
+ $old = $this->img;
+ $this->img = $new;
+
+ if ($old != null) {
+ imagedestroy($old);
+ }
+ }
+
+ private function fix_alpha()
+ {
+ imagealphablending($this->img,false);
+ imagesavealpha($this->img,true);
+ }
+
+}