7  * Image processing adapter for PHP's libGD
11     /** @var resource libGD image */
12     protected $image;  variable in splitbrain\\slika\\GdAdapter
13     /** @var int width of the current image */
15     /** @var int height of the current image */
25         $this->image = $this->loadImage($imagepath);
33         // destroy the GD image resource (only needed on PHP < 8.0)
34         if (is_resource($this->image)) {
35             imagedestroy($this->image);
90         $transparency = imagecolorallocatealpha($this->image, 0, 0, 0, 127);
94             $image = imagerotate($this->image, 180, $transparency);
97             $image = imagerotate($this->image, -90, $transparency);
100             $image = imagerotate($this->image, 90, $transparency);
103         /** @var resource $image is now defined */
107             imageflip($image, IMG_FLIP_HORIZONTAL);
110         $this->__destruct(); // destroy old image
111         $this->image = $image;
115             imagealphablending($this->image, false);
116             imagesavealpha($this->image, true);
156         $saver = 'image' . $extension;
158             throw new Exception('Can not save image format ' . $extension);
162             imagejpeg($this->image, $path, $this->options['quality']);
164             $saver($this->image, $path);
171      * Initialize libGD on the given image
182             throw new Exception('Failed to read image information');
187         // what type of image is it?
191             throw new Exception('Can not work with image format ' . $this->extension);
195         $image = @$creator($path);
197         if ($image === false) {
198             throw new Exception('Failed to load image wiht libGD');
201         return $image;
205      * Creates a new blank image to which we can copy
236             $this->keepGifTransparency($this->image, $canvas);
247      * @param resource $image Original image
248      * @param resource $canvas New, empty image
251     protected function keepGifTransparency($image, $canvas)  argument
262             $transcolorindex = @imagecolortransparent($image);
263             $transcolor = @imagecolorsforindex($image, $transcolorindex);
345      * from the original image to be then resized to the wanted dimensions.
414                 $this->image,
427                 $this->image,
439         // destroy original GD image ressource and replace with new one
441         $this->image = $newimg;