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File: image.php
<?php /** * @package Joomla.Platform * @subpackage Image * * @copyright Copyright (C) 2005 - 2012 Open Source Matters, Inc. All rights reserved. * @license GNU General Public License version 2 or later; see LICENSE */ defined('JPATH_PLATFORM') or die; /** * Class to manipulate an image. * * @package Joomla.Platform * @subpackage Image * @since 11.3 */ class JImage { /** * @const integer * @since 11.3 */ const SCALE_FILL = 1; /** * @const integer * @since 11.3 */ const SCALE_INSIDE = 2; /** * @const integer * @since 11.3 */ const SCALE_OUTSIDE = 3; /** * @var resource The image resource handle. * @since 11.3 */ protected $handle; /** * @var string The source image path. * @since 11.3 */ protected $path = null; /** * @var array Whether or not different image formats are supported. * @since 11.3 */ protected static $formats = array(); /** * Class constructor. * * @param mixed $source Either a file path for a source image or a GD resource handler for an image. * * @since 11.3 * @throws RuntimeException */ public function __construct($source = null) { // Verify that GD support for PHP is available. if (!extension_loaded('gd')) { // @codeCoverageIgnoreStart JLog::add('The GD extension for PHP is not available.', JLog::ERROR); throw new RuntimeException('The GD extension for PHP is not available.'); // @codeCoverageIgnoreEnd } // Determine which image types are supported by GD, but only once. if (!isset(self::$formats[IMAGETYPE_JPEG])) { $info = gd_info(); self::$formats[IMAGETYPE_JPEG] = ($info['JPEG Support']) ? true : false; self::$formats[IMAGETYPE_PNG] = ($info['PNG Support']) ? true : false; self::$formats[IMAGETYPE_GIF] = ($info['GIF Read Support']) ? true : false; } // If the source input is a resource, set it as the image handle. if (is_resource($source) && (get_resource_type($source) == 'gd')) { $this->handle = &$source; } elseif (!empty($source) && is_string($source)) { // If the source input is not empty, assume it is a path and populate the image handle. $this->loadFile($source); } } /** * Method to return a properties object for an image given a filesystem path. The * result object has values for image width, height, type, attributes, mime type, bits, * and channels. * * @param string $path The filesystem path to the image for which to get properties. * * @return object * * @since 11.3 * @throws InvalidArgumentException * @throws RuntimeException */ public static function getImageFileProperties($path) { // Make sure the file exists. if (!file_exists($path)) { throw new InvalidArgumentException('The image file does not exist.'); } // Get the image file information. $info = getimagesize($path); if (!$info) { // @codeCoverageIgnoreStart throw new RuntimeException('Unable to get properties for the image.'); // @codeCoverageIgnoreEnd } // Build the response object. $properties = (object) array( 'width' => $info[0], 'height' => $info[1], 'type' => $info[2], 'attributes' => $info[3], 'bits' => isset($info['bits']) ? $info['bits'] : null, 'channels' => isset($info['channels']) ? $info['channels'] : null, 'mime' => $info['mime'] ); return $properties; } /** * Method to crop the current image. * * @param mixed $width The width of the image section to crop in pixels or a percentage. * @param mixed $height The height of the image section to crop in pixels or a percentage. * @param integer $left The number of pixels from the left to start cropping. * @param integer $top The number of pixels from the top to start cropping. * @param bool $createNew If true the current image will be cloned, cropped and returned; else * the current image will be cropped and returned. * * @return JImage * * @since 11.3 * @throws LogicException */ public function crop($width, $height, $left, $top, $createNew = true) { // Make sure the resource handle is valid. if (!$this->isLoaded()) { throw new LogicException('No valid image was loaded.'); } // Sanitize width. $width = $this->sanitizeWidth($width, $height); // Sanitize height. $height = $this->sanitizeHeight($height, $width); // Sanitize left. $left = $this->sanitizeOffset($left); // Sanitize top. $top = $this->sanitizeOffset($top); // Create the new truecolor image handle. $handle = imagecreatetruecolor($width, $height); // Allow transparency for the new image handle. imagealphablending($handle, false); imagesavealpha($handle, true); if ($this->isTransparent()) { // Get the transparent color values for the current image. $rgba = imageColorsForIndex($this->handle, imagecolortransparent($this->handle)); $color = imageColorAllocate($this->handle, $rgba['red'], $rgba['green'], $rgba['blue']); // Set the transparent color values for the new image. imagecolortransparent($handle, $color); imagefill($handle, 0, 0, $color); imagecopyresized($handle, $this->handle, 0, 0, $left, $top, $width, $height, $width, $height); } else { imagecopyresampled($handle, $this->handle, 0, 0, $left, $top, $width, $height, $width, $height); } // If we are cropping to a new image, create a new JImage object. if ($createNew) { // @codeCoverageIgnoreStart $new = new JImage($handle); return $new; // @codeCoverageIgnoreEnd } // Swap out the current handle for the new image handle. else { $this->handle = $handle; return $this; } } /** * Method to apply a filter to the image by type. Two examples are: grayscale and sketchy. * * @param string $type The name of the image filter to apply. * @param array $options An array of options for the filter. * * @return JImage * * @since 11.3 * @see JImageFilter * @throws LogicException * @throws RuntimeException */ public function filter($type, array $options = array()) { // Make sure the resource handle is valid. if (!$this->isLoaded()) { throw new LogicException('No valid image was loaded.'); } // Get the image filter instance. $filter = $this->getFilterInstance($type); // Execute the image filter. $filter->execute($options); return $this; } /** * Method to get the height of the image in pixels. * * @return integer * * @since 11.3 * @throws LogicException */ public function getHeight() { // Make sure the resource handle is valid. if (!$this->isLoaded()) { throw new LogicException('No valid image was loaded.'); } return imagesy($this->handle); } /** * Method to get the width of the image in pixels. * * @return integer * * @since 11.3 * @throws LogicException */ public function getWidth() { // Make sure the resource handle is valid. if (!$this->isLoaded()) { throw new LogicException('No valid image was loaded.'); } return imagesx($this->handle); } /** * Method to return the path * * @return string * * @since 11.3 */ public function getPath() { return $this->path; } /** * Method to determine whether or not an image has been loaded into the object. * * @return bool * * @since 11.3 */ public function isLoaded() { // Make sure the resource handle is valid. if (!is_resource($this->handle) || (get_resource_type($this->handle) != 'gd')) { return false; } return true; } /** * Method to determine whether or not the image has transparency. * * @return bool * * @since 11.3 * @throws LogicException */ public function isTransparent() { // Make sure the resource handle is valid. if (!$this->isLoaded()) { throw new LogicException('No valid image was loaded.'); } return (imagecolortransparent($this->handle) >= 0); } /** * Method to load a file into the JImage object as the resource. * * @param string $path The filesystem path to load as an image. * * @return void * * @since 11.3 * @throws InvalidArgumentException * @throws RuntimeException */ public function loadFile($path) { // Make sure the file exists. if (!file_exists($path)) { throw new InvalidArgumentException('The image file does not exist.'); } // Get the image properties. $properties = self::getImageFileProperties($path); // Attempt to load the image based on the MIME-Type switch ($properties->mime) { case 'image/gif': // Make sure the image type is supported. if (empty(self::$formats[IMAGETYPE_GIF])) { // @codeCoverageIgnoreStart JLog::add('Attempting to load an image of unsupported type GIF.', JLog::ERROR); throw new RuntimeException('Attempting to load an image of unsupported type GIF.'); // @codeCoverageIgnoreEnd } // Attempt to create the image handle. $handle = imagecreatefromgif($path); if (!is_resource($handle)) { // @codeCoverageIgnoreStart throw new RuntimeException('Unable to process GIF image.'); // @codeCoverageIgnoreEnd } $this->handle = $handle; break; case 'image/jpeg': // Make sure the image type is supported. if (empty(self::$formats[IMAGETYPE_JPEG])) { // @codeCoverageIgnoreStart JLog::add('Attempting to load an image of unsupported type JPG.', JLog::ERROR); throw new RuntimeException('Attempting to load an image of unsupported type JPG.'); // @codeCoverageIgnoreEnd } // Attempt to create the image handle. $handle = imagecreatefromjpeg($path); if (!is_resource($handle)) { // @codeCoverageIgnoreStart throw new RuntimeException('Unable to process JPG image.'); // @codeCoverageIgnoreEnd } $this->handle = $handle; break; case 'image/png': // Make sure the image type is supported. if (empty(self::$formats[IMAGETYPE_PNG])) { // @codeCoverageIgnoreStart JLog::add('Attempting to load an image of unsupported type PNG.', JLog::ERROR); throw new RuntimeException('Attempting to load an image of unsupported type PNG.'); // @codeCoverageIgnoreEnd } // Attempt to create the image handle. $handle = imagecreatefrompng($path); if (!is_resource($handle)) { // @codeCoverageIgnoreStart throw new RuntimeException('Unable to process PNG image.'); // @codeCoverageIgnoreEnd } $this->handle = $handle; break; default: JLog::add('Attempting to load an image of unsupported type: ' . $properties->mime, JLog::ERROR); throw new InvalidArgumentException('Attempting to load an image of unsupported type: ' . $properties->mime); break; } // Set the filesystem path to the source image. $this->path = $path; } /** * Method to resize the current image. * * @param mixed $width The width of the resized image in pixels or a percentage. * @param mixed $height The height of the resized image in pixels or a percentage. * @param bool $createNew If true the current image will be cloned, resized and returned; else * the current image will be resized and returned. * @param integer $scaleMethod Which method to use for scaling * * @return JImage * * @since 11.3 * @throws LogicException */ public function resize($width, $height, $createNew = true, $scaleMethod = JImage::SCALE_INSIDE) { // Make sure the resource handle is valid. if (!$this->isLoaded()) { throw new LogicException('No valid image was loaded.'); } // Sanitize width. $width = $this->sanitizeWidth($width, $height); // Sanitize height. $height = $this->sanitizeHeight($height, $width); // Prepare the dimensions for the resize operation. $dimensions = $this->prepareDimensions($width, $height, $scaleMethod); // Create the new truecolor image handle. $handle = imagecreatetruecolor($dimensions->width, $dimensions->height); // Allow transparency for the new image handle. imagealphablending($handle, false); imagesavealpha($handle, true); if ($this->isTransparent()) { // Get the transparent color values for the current image. $rgba = imageColorsForIndex($this->handle, imagecolortransparent($this->handle)); $color = imageColorAllocate($this->handle, $rgba['red'], $rgba['green'], $rgba['blue']); // Set the transparent color values for the new image. imagecolortransparent($handle, $color); imagefill($handle, 0, 0, $color); imagecopyresized($handle, $this->handle, 0, 0, 0, 0, $dimensions->width, $dimensions->height, $this->getWidth(), $this->getHeight()); } else { imagecopyresampled($handle, $this->handle, 0, 0, 0, 0, $dimensions->width, $dimensions->height, $this->getWidth(), $this->getHeight()); } // If we are resizing to a new image, create a new JImage object. if ($createNew) { // @codeCoverageIgnoreStart $new = new JImage($handle); return $new; // @codeCoverageIgnoreEnd } // Swap out the current handle for the new image handle. else { $this->handle = $handle; return $this; } } /** * Method to rotate the current image. * * @param mixed $angle The angle of rotation for the image * @param integer $background The background color to use when areas are added due to rotation * @param bool $createNew If true the current image will be cloned, rotated and returned; else * the current image will be rotated and returned. * * @return JImage * * @since 11.3 * @throws LogicException */ public function rotate($angle, $background = -1, $createNew = true) { // Make sure the resource handle is valid. if (!$this->isLoaded()) { throw new LogicException('No valid image was loaded.'); } // Sanitize input $angle = floatval($angle); // Create the new truecolor image handle. $handle = imagecreatetruecolor($this->getWidth(), $this->getHeight()); // Allow transparency for the new image handle. imagealphablending($handle, false); imagesavealpha($handle, true); // Copy the image imagecopy($handle, $this->handle, 0, 0, 0, 0, $this->getWidth(), $this->getHeight()); // Rotate the image $handle = imagerotate($handle, $angle, $background); // If we are resizing to a new image, create a new JImage object. if ($createNew) { // @codeCoverageIgnoreStart $new = new JImage($handle); return $new; // @codeCoverageIgnoreEnd } // Swap out the current handle for the new image handle. else { $this->handle = $handle; return $this; } } /** * Method to write the current image out to a file. * * @param string $path The filesystem path to save the image. * @param integer $type The image type to save the file as. * @param array $options The image type options to use in saving the file. * * @return void * * @see http://www.php.net/manual/image.constants.php * @since 11.3 * @throws LogicException */ public function toFile($path, $type = IMAGETYPE_JPEG, array $options = array()) { // Make sure the resource handle is valid. if (!$this->isLoaded()) { throw new LogicException('No valid image was loaded.'); } switch ($type) { case IMAGETYPE_GIF: imagegif($this->handle, $path); break; case IMAGETYPE_PNG: imagepng($this->handle, $path, (array_key_exists('quality', $options)) ? $options['quality'] : 0); break; case IMAGETYPE_JPEG: default: imagejpeg($this->handle, $path, (array_key_exists('quality', $options)) ? $options['quality'] : 100); } } /** * Method to get an image filter instance of a specified type. * * @param string $type The image filter type to get. * * @return JImageFilter * * @since 11.3 * @throws RuntimeException */ protected function getFilterInstance($type) { // Sanitize the filter type. $type = strtolower(preg_replace('#[^A-Z0-9_]#i', '', $type)); // Verify that the filter type exists. $className = 'JImageFilter' . ucfirst($type); if (!class_exists($className)) { JLog::add('The ' . ucfirst($type) . ' image filter is not available.', JLog::ERROR); throw new RuntimeException('The ' . ucfirst($type) . ' image filter is not available.'); } // Instantiate the filter object. $instance = new $className($this->handle); // Verify that the filter type is valid. if (!($instance instanceof JImageFilter)) { // @codeCoverageIgnoreStart JLog::add('The ' . ucfirst($type) . ' image filter is not valid.', JLog::ERROR); throw new RuntimeException('The ' . ucfirst($type) . ' image filter is not valid.'); // @codeCoverageIgnoreEnd } return $instance; } /** * Method to get the new dimensions for a resized image. * * @param integer $width The width of the resized image in pixels. * @param integer $height The height of the resized image in pixels. * @param integer $scaleMethod The method to use for scaling * * @return object * * @since 11.3 * @throws InvalidArgumentException */ protected function prepareDimensions($width, $height, $scaleMethod) { // Instantiate variables. $dimensions = new stdClass; switch ($scaleMethod) { case JImage::SCALE_FILL: $dimensions->width = intval(round($width)); $dimensions->height = intval(round($height)); break; case JImage::SCALE_INSIDE: case JImage::SCALE_OUTSIDE: $rx = $this->getWidth() / $width; $ry = $this->getHeight() / $height; if ($scaleMethod == JImage::SCALE_INSIDE) { $ratio = ($rx > $ry) ? $rx : $ry; } else { $ratio = ($rx < $ry) ? $rx : $ry; } $dimensions->width = intval(round($this->getWidth() / $ratio)); $dimensions->height = intval(round($this->getHeight() / $ratio)); break; default: throw new InvalidArgumentException('Invalid scale method.'); break; } return $dimensions; } /** * Method to sanitize a height value. * * @param mixed $height The input height value to sanitize. * @param mixed $width The input width value for reference. * * @return integer * * @since 11.3 */ protected function sanitizeHeight($height, $width) { // If no height was given we will assume it is a square and use the width. $height = ($height === null) ? $width : $height; // If we were given a percentage, calculate the integer value. if (preg_match('/^[0-9]+(\.[0-9]+)?\%$/', $height)) { $height = intval(round($this->getHeight() * floatval(str_replace('%', '', $height)) / 100)); } // Else do some rounding so we come out with a sane integer value. else { $height = intval(round(floatval($height))); } return $height; } /** * Method to sanitize an offset value like left or top. * * @param mixed $offset An offset value. * * @return integer * * @since 11.3 */ protected function sanitizeOffset($offset) { return intval(round(floatval($offset))); } /** * Method to sanitize a width value. * * @param mixed $width The input width value to sanitize. * @param mixed $height The input height value for reference. * * @return integer * * @since 11.3 */ protected function sanitizeWidth($width, $height) { // If no width was given we will assume it is a square and use the height. $width = ($width === null) ? $height : $width; // If we were given a percentage, calculate the integer value. if (preg_match('/^[0-9]+(\.[0-9]+)?\%$/', $width)) { $width = intval(round($this->getWidth() * floatval(str_replace('%', '', $width)) / 100)); } // Else do some rounding so we come out with a sane integer value. else { $width = intval(round(floatval($width))); } return $width; } }
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