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-rw-r--r--application/libraries/Image.php274
1 files changed, 105 insertions, 169 deletions
diff --git a/application/libraries/Image.php b/application/libraries/Image.php
index 0f920358a..9c624eec1 100644
--- a/application/libraries/Image.php
+++ b/application/libraries/Image.php
@@ -1,12 +1,76 @@
<?php
/*
- * Copyright 2014 Florian "Bluewind" Pritz <bluewind@server-speed.net>
+ * Copyright 2014-2015 Florian "Bluewind" Pritz <bluewind@server-speed.net>
*
* Licensed under AGPLv3
* (see COPYING for full license text)
*
*/
+namespace libraries\Image;
+
+interface ImageDriver {
+ /**
+ * Replace the current image by reading in a file
+ * @param file file to read
+ */
+ public function read($file);
+
+ /**
+ * Return the current image rendered to a specific format. Passing null as
+ * the target_type returns the image in the format of the source image
+ * (loaded with read()).
+ *
+ * @param target_type one of IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG or null
+ * @return binary image data
+ */
+ public function get($target_type);
+
+ /**
+ * Resize the image.
+ * @param width
+ * @param height
+ */
+ public function resize($width, $height);
+
+ /**
+ * Crop the image to the area defined by x, y, width and height.
+ *
+ * @param x starting coordinate
+ * @param y starting coordinate
+ * @param width width of the area
+ * @param height height of the area
+ */
+ public function crop($x, $y, $width, $height);
+
+ /**
+ * Crop/resize the image to fit into the desired size. This also rotates
+ * the image if the source image had an EXIF orientation tag.
+ *
+ * @param width width of the resulting image
+ * @param height height of the resulting image
+ */
+ public function makeThumb($target_width, $target_height);
+
+ /**
+ * Rotate the image according to the sources EXIF orientation tag if any.
+ */
+ public function apply_exif_orientation();
+
+ /**
+ * Mirror the image along the x axis.
+ */
+ public function mirror();
+
+ /**
+ * Return priority for this driver. Higher number means a higher priority.
+ *
+ * @param mimetype mimetype of the file
+ * @return > 0 if supported, < 0 if the mimetype can't be handled
+ */
+ public static function get_priority($mimetype);
+}
+
namespace libraries;
/**
@@ -14,9 +78,12 @@ namespace libraries;
* operate on this image.
*/
class Image {
- private $img;
- private $source_type;
- private $exif;
+ private $driver;
+
+ private $image_drivers = array(
+ "libraries\Image\Drivers\GD",
+ "libraries\Image\Drivers\imagemagick",
+ );
/**
* Create a new object and load the contents of file.
@@ -28,39 +95,42 @@ class Image {
}
/**
- * Replace the current image by reading in a file
- * @param file file to read
+ * Get the best driver supporting $mimetype.
+ *
+ * @param drivers list of driver classes
+ * @param mimetype mimetype the driver should support
+ * @return driver from $drivers or NULL if no driver supports the type
*/
- public function read($file)
+ private function best_driver($drivers, $mimetype)
{
- $img = imagecreatefromstring(file_get_contents($file));
- if ($img === false) {
- throw new \exceptions\ApiException("libraries/Image/unsupported-image-type", "Unsupported image type");
+ $best = 0;
+ $best_driver = null;
+ foreach ($drivers as $driver) {
+ $current = $driver::get_priority($mimetype);
+ if ($best == 0 || ($current > $best && $current > 0)) {
+ $best_driver = $driver;
+ $best = $current;
+ }
}
- $this->set_img_object($img);
- $this->fix_alpha();
- $this->source_type = getimagesize($file)[2];
- $this->exif = self::get_exif($file);
+ return $best_driver;
}
- static private function get_exif($file)
+ /**
+ * Replace the current image by reading in a file
+ * @param file file to read
+ */
+ public function read($file)
{
- $type = getimagesize($file)[2];
- switch ($type) {
- case IMAGETYPE_JPEG:
- getimagesize($file, $info);
- if (isset($info["APP1"]) && strpos($info["APP1"], "http://ns.adobe.com/xap/1.0/") === 0) {
- // ignore XMP data which makes exif_read_data throw a warning
- // http://stackoverflow.com/a/8864064
- return false;
- }
- return @exif_read_data($file);
- break;
- default:
+ $mimetype = mimetype($file);
+
+ $driver = $this->best_driver($this->image_drivers, $mimetype);
+
+ if ($driver === NULL) {
+ throw new \exceptions\ApiException("libraries/Image/unsupported-image-type", "Unsupported image type");
}
- return false;
+ $this->driver = new $driver($file);
}
/**
@@ -73,31 +143,7 @@ class Image {
*/
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;
+ return $this->driver->get($target_type);
}
/**
@@ -107,18 +153,7 @@ class Image {
*/
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);
+ return $this->driver->resize($width, $height);
}
/**
@@ -131,17 +166,7 @@ class Image {
*/
public function crop($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);
+ return $this->driver->crop($x, $y, $width, $height);
}
/**
@@ -151,34 +176,14 @@ class Image {
* @param width width of the resulting image
* @param height height of the resulting image
*/
- // Source: http://salman-w.blogspot.co.at/2009/04/crop-to-fit-image-using-aspphp.html
public function makeThumb($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();
+ return $this->driver->makeThumb($target_width, $target_height);
}
static public function get_exif_orientation($file)
{
- $exif = self::get_exif($file);
+ $exif = \libraries\Exif::get_exif($file);
if (isset($exif["Orientation"])) {
return $exif["Orientation"];
}
@@ -190,45 +195,7 @@ class Image {
*/
public function apply_exif_orientation()
{
- if (isset($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();
- }
- }
+ return $this->driver->apply_exif_orientation();
}
/**
@@ -236,38 +203,7 @@ class Image {
*/
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);
+ return $this->driver->mirror();
}
}
generated by cgit v1.2.3-24-g4f1b (git 2.32.0) at 2024-11-05 08:33:30 +0100