freenetis-github/system/libraries/drivers/Image/GD.php @ 18ac9009
| 8baed187 | Michal Kliment | <?php defined('SYSPATH') or die('No direct script access.');
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class Image_GD_Driver extends Image_Driver {
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// A transparent PNG as a string
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protected static $blank_png;
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protected static $blank_png_width;
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protected static $blank_png_height;
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public function __construct()
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{
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// Make sure that GD2 is available
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if ( ! function_exists('gd_info'))
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throw new Kohana_Exception('image.gd.requires_v2');
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// Get the GD information
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$info = gd_info();
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// Make sure that the GD2 is installed
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if (strpos($info['GD Version'], '2.') === FALSE)
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throw new Kohana_Exception('image.gd.requires_v2');
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}
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public function process($image, $actions, $dir, $file)
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{
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// Set the "create" function
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switch ($image['type'])
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{
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case IMAGETYPE_JPEG:
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$create = 'imagecreatefromjpeg';
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break;
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case IMAGETYPE_GIF:
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$create = 'imagecreatefromgif';
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break;
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case IMAGETYPE_PNG:
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$create = 'imagecreatefrompng';
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break;
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}
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// Set the "save" function
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switch (substr($file, strrpos($file, '.') + 1))
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{
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case 'jpg':
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case 'jpeg':
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$save = 'imagejpeg';
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break;
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case 'gif':
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$save = 'imagegif';
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break;
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case 'png':
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$save = 'imagepng';
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break;
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}
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// Make sure the image type is supported for import
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if (empty($create) OR ! function_exists($create))
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throw new Kohana_Exception('image.type_not_allowed', $image['file']);
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// Make sure the image type is supported for saving
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if (empty($save) OR ! function_exists($save))
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throw new Kohana_Exception('image.type_not_allowed', $dir.$file);
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// Load the image
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$this->image = $image;
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// Create the GD image resource
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$this->tmp_image = $create($image['file']);
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// Get the quality setting from the actions
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$quality = arr::remove('quality', $actions);
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if ($status = $this->execute($actions))
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{
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// Prevent the alpha from being lost
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imagealphablending($this->tmp_image, TRUE);
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imagesavealpha($this->tmp_image, TRUE);
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switch ($save)
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{
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case 'imagejpeg':
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// Default the quality to 95
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($quality === NULL) and $quality = 95;
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break;
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case 'imagegif':
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// Remove the quality setting, GIF doesn't use it
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unset($quality);
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break;
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case 'imagepng':
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// Always use a compression level of 9 for PNGs. This does not
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// affect quality, it only increases the level of compression!
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$quality = 9;
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break;
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}
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// Set the status to the save return value, saving with the quality reques
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$status = isset($quality) ? $save($this->tmp_image, $dir.$file, $quality) : $save($this->tmp_image, $dir.$file);
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// Destroy the temporary image
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imagedestroy($this->tmp_image);
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}
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return $status;
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}
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public function flip($direction)
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{
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// Get the current width and height
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$width = imagesx($this->tmp_image);
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$height = imagesy($this->tmp_image);
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// Create the flipped image
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$flipped = $this->imagecreatetransparent($width, $height);
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if ($direction === Image::HORIZONTAL)
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{
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for ($x = 0; $x < $width; $x++)
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{
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$status = imagecopy($flipped, $this->tmp_image, $x, 0, $width - $x - 1, 0, 1, $height);
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}
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}
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elseif ($direction === Image::VERTICAL)
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{
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for ($y = 0; $y < $height; $y++)
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{
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$status = imagecopy($flipped, $this->tmp_image, 0, $y, 0, $height - $y - 1, $width, 1);
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}
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}
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else
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{
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// Do nothing
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return TRUE;
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}
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if ($status === TRUE)
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{
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// Swap the new image for the old one
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imagedestroy($this->tmp_image);
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$this->tmp_image = $flipped;
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}
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return $status;
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}
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public function crop($properties)
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{
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// Sanitize the cropping settings
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$this->sanitize_geometry($properties);
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// Get the current width and height
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$width = imagesx($this->tmp_image);
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$height = imagesy($this->tmp_image);
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// Create the temporary image to copy to
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$img = $this->imagecreatetransparent($properties['width'], $properties['height']);
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// Execute the crop
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if ($status = imagecopyresampled($img, $this->tmp_image, 0, 0, $properties['left'], $properties['top'], $width, $height, $width, $height))
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{
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// Swap the new image for the old one
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imagedestroy($this->tmp_image);
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$this->tmp_image = $img;
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}
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return $status;
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}
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public function resize($properties)
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{
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// Get the current width and height
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$width = imagesx($this->tmp_image);
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$height = imagesy($this->tmp_image);
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if (substr($properties['width'], -1) === '%')
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{
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// Recalculate the percentage to a pixel size
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$properties['width'] = round($width * (substr($properties['width'], 0, -1) / 100));
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}
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if (substr($properties['height'], -1) === '%')
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{
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// Recalculate the percentage to a pixel size
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$properties['height'] = round($height * (substr($properties['height'], 0, -1) / 100));
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}
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if ($properties['master'] === Image::AUTO)
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{
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// Change an automatic master dim to the correct type
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$properties['master'] = ($width > $height) ? Image::WIDTH : Image::HEIGHT;
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}
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// Recalculate the width and height, if they are missing
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empty($properties['width']) and $properties['width'] = round($width * $properties['height'] / $height);
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empty($properties['height']) and $properties['height'] = round($height * $properties['width'] / $width);
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if (empty($properties['height']) OR $properties['master'] === Image::WIDTH)
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{
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// Recalculate the height based on the width
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$properties['height'] = round($height * $properties['width'] / $width);
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}
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if (empty($properties['width']) OR $properties['master'] === Image::HEIGHT)
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{
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// Recalculate the width based on the height
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$properties['width'] = round($width * $properties['height'] / $height);
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}
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// Create the temporary image to copy to
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$img = $this->imagecreatetransparent($properties['width'], $properties['height']);
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// Execute the resize
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if ($status = imagecopyresampled($img, $this->tmp_image, 0, 0, 0, 0, $properties['width'], $properties['height'], $width, $height))
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{
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// Swap the new image for the old one
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imagedestroy($this->tmp_image);
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$this->tmp_image = $img;
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}
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return $status;
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}
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public function rotate($amount)
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{
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// Use current image to rotate
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$img = $this->tmp_image;
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// White, with an alpha of 0
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$transparent = imagecolorallocatealpha($img, 255, 255, 255, 127);
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// Rotate, setting the transparent color
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$img = imagerotate($img, 360 - $amount, $transparent, -1);
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// Fill the background with the transparent "color"
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imagecolortransparent($img, $transparent);
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// Merge the images
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if ($status = imagecopymerge($this->tmp_image, $img, 0, 0, 0, 0, imagesx($this->tmp_image), imagesy($this->tmp_image), 100))
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{
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// Prevent the alpha from being lost
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imagealphablending($img, TRUE);
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imagesavealpha($img, TRUE);
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// Swap the new image for the old one
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imagedestroy($this->tmp_image);
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$this->tmp_image = $img;
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}
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return $status;
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}
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public function sharpen($amount)
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{
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// Make sure that the sharpening function is available
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if ( ! function_exists('imageconvolution'))
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throw new Kohana_Exception('image.unsupported_method', __FUNCTION__);
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// Amount should be in the range of 18-10
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$amount = round(abs(-18 + ($amount * 0.08)), 2);
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// Gaussian blur matrix
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$matrix = array
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(
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array(-1, -1, -1),
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array(-1, $amount, -1),
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array(-1, -1, -1)
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);
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// Perform the sharpen
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return imageconvolution($this->tmp_image, $matrix, $amount - 8, 0);
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}
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protected function properties()
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{
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return array(imagesx($this->tmp_image), imagesy($this->tmp_image));
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}
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/**
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* Returns an image with a transparent background. Used for rotating to
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* prevent unfilled backgrounds.
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*
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* @param integer image width
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* @param integer image height
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* @return resource
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*/
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protected function imagecreatetransparent($width, $height)
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{
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if (self::$blank_png === NULL)
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{
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// Decode the blank PNG if it has not been done already
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self::$blank_png = imagecreatefromstring(base64_decode
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(
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'iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAYAAACM/rhtAAAABGdBTUEAAK/INwWK6QAAABl0RVh0U29'.
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'mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAADqSURBVHjaYvz//z/DYAYAAcTEMMgBQAANegcCBN'.
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'CgdyBAAA16BwIE0KB3IEAADXoHAgTQoHcgQAANegcCBNCgdyBAAA16BwIE0KB3IEAADXoHAgTQoHcgQ'.
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'AANegcCBNCgdyBAAA16BwIE0KB3IEAADXoHAgTQoHcgQAANegcCBNCgdyBAAA16BwIE0KB3IEAADXoH'.
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'AgTQoHcgQAANegcCBNCgdyBAAA16BwIE0KB3IEAADXoHAgTQoHcgQAANegcCBNCgdyBAAA16BwIE0KB'.
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'3IEAADXoHAgTQoHcgQAANegcCBNCgdyBAgAEAMpcDTTQWJVEAAAAASUVORK5CYII='
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));
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// Set the blank PNG width and height
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self::$blank_png_width = imagesx(self::$blank_png);
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self::$blank_png_height = imagesy(self::$blank_png);
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}
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$img = imagecreatetruecolor($width, $height);
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// Resize the blank image
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imagecopyresized($img, self::$blank_png, 0, 0, 0, 0, $width, $height, self::$blank_png_width, self::$blank_png_height);
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// Prevent the alpha from being lost
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imagealphablending($img, FALSE);
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imagesavealpha($img, TRUE);
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return $img;
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}
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} // End Image GD Driver
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