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rcube_image.php
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rcube_image.php
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<?php
/**
+-----------------------------------------------------------------------+
| This file is part of the Roundcube Webmail client |
| |
| Copyright (C) The Roundcube Dev Team |
| Copyright (C) Kolab Systems AG |
| |
| Licensed under the GNU General Public License version 3 or |
| any later version with exceptions for skins & plugins. |
| See the README file for a full license statement. |
| |
| PURPOSE: |
| Image resizer and converter |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
| Author: Aleksander Machniak <alec@alec.pl> |
+-----------------------------------------------------------------------+
*/
/**
* Image resizer and converter
*
* @package Framework
* @subpackage Utils
*/
class rcube_image
{
private $image_file;
const TYPE_GIF = 1;
const TYPE_JPG = 2;
const TYPE_PNG = 3;
const TYPE_TIF = 4;
public static $extensions = array(
self::TYPE_GIF => 'gif',
self::TYPE_JPG => 'jpg',
self::TYPE_PNG => 'png',
self::TYPE_TIF => 'tif',
);
/**
* Class constructor
*
* @param string $filename Image file name/path
*/
function __construct($filename)
{
$this->image_file = $filename;
}
/**
* Get image properties.
*
* @return mixed Hash array with image props like type, width, height
*/
public function props()
{
// use GD extension
if (function_exists('getimagesize') && ($imsize = @getimagesize($this->image_file))) {
$width = $imsize[0];
$height = $imsize[1];
$gd_type = $imsize[2];
$type = image_type_to_extension($gd_type, false);
$channels = $imsize['channels'];
}
// use ImageMagick
if (!$type && ($data = $this->identify())) {
list($type, $width, $height) = $data;
$channels = null;
}
if ($type) {
return array(
'type' => $type,
'gd_type' => $gd_type,
'width' => $width,
'height' => $height,
'channels' => $channels,
);
}
}
/**
* Resize image to a given size. Use only to shrink an image.
* If an image is smaller than specified size it will be not resized.
*
* @param int $size Max width/height size
* @param string $filename Output filename
* @param boolean $browser_compat Convert to image type displayable by any browser
*
* @return mixed Output type on success, False on failure
*/
public function resize($size, $filename = null, $browser_compat = false)
{
$result = false;
$rcube = rcube::get_instance();
$convert = $rcube->config->get('im_convert_path', false);
$props = $this->props();
if (empty($props)) {
return false;
}
if (!$filename) {
$filename = $this->image_file;
}
// use Imagemagick
if ($convert || class_exists('Imagick', false)) {
$p['out'] = $filename;
$p['in'] = $this->image_file;
$type = $props['type'];
if (!$type && ($data = $this->identify())) {
$type = $data[0];
}
$type = strtr($type, array("jpeg" => "jpg", "tiff" => "tif", "ps" => "eps", "ept" => "eps"));
$p['intype'] = $type;
// convert to an image format every browser can display
if ($browser_compat && !in_array($type, array('jpg','gif','png'))) {
$type = 'jpg';
}
// If only one dimension is greater than the limit convert doesn't
// work as expected, we need to calculate new dimensions
$scale = $size / max($props['width'], $props['height']);
// if file is smaller than the limit, we do nothing
// but copy original file to destination file
if ($scale >= 1 && $p['intype'] == $type) {
$result = ($this->image_file == $filename || copy($this->image_file, $filename)) ? '' : false;
}
else {
$valid_types = "bmp,eps,gif,jp2,jpg,png,svg,tif";
if (in_array($type, explode(',', $valid_types))) { // Valid type?
if ($scale >= 1) {
$width = $props['width'];
$height = $props['height'];
}
else {
$width = intval($props['width'] * $scale);
$height = intval($props['height'] * $scale);
}
// use ImageMagick in command line
if ($convert) {
$p += array(
'type' => $type,
'quality' => 75,
'size' => $width . 'x' . $height,
);
$result = rcube::exec($convert . ' 2>&1 -flatten -auto-orient -colorspace sRGB -strip'
. ' -quality {quality} -resize {size} {intype}:{in} {type}:{out}', $p);
}
// use PHP's Imagick class
else {
try {
$image = new Imagick($this->image_file);
try {
// it throws exception on formats not supporting these features
$image->setImageBackgroundColor('white');
$image->setImageAlphaChannel(11);
$image->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
}
catch (Exception $e) {
// ignore errors
}
$image->setImageColorspace(Imagick::COLORSPACE_SRGB);
$image->setImageCompressionQuality(75);
$image->setImageFormat($type);
$image->stripImage();
$image->scaleImage($width, $height);
if ($image->writeImage($filename)) {
$result = '';
}
}
catch (Exception $e) {
rcube::raise_error($e, true, false);
}
}
}
}
if ($result === '') {
@chmod($filename, 0600);
return $type;
}
}
// do we have enough memory? (#1489937)
if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN' && !$this->mem_check($props)) {
return false;
}
// use GD extension
if ($props['gd_type']) {
if ($props['gd_type'] == IMAGETYPE_JPEG && function_exists('imagecreatefromjpeg')) {
$image = imagecreatefromjpeg($this->image_file);
$type = 'jpg';
}
else if ($props['gd_type'] == IMAGETYPE_GIF && function_exists('imagecreatefromgif')) {
$image = imagecreatefromgif($this->image_file);
$type = 'gif';
}
else if ($props['gd_type'] == IMAGETYPE_PNG && function_exists('imagecreatefrompng')) {
$image = imagecreatefrompng($this->image_file);
$type = 'png';
}
else {
// @TODO: print error to the log?
return false;
}
if ($image === false) {
return false;
}
$scale = $size / max($props['width'], $props['height']);
// Imagemagick resize is implemented in shrinking mode (see -resize argument above)
// we do the same here, if an image is smaller than specified size
// we do nothing but copy original file to destination file
if ($scale >= 1) {
$result = $this->image_file == $filename || copy($this->image_file, $filename);
}
else {
$width = intval($props['width'] * $scale);
$height = intval($props['height'] * $scale);
$new_image = imagecreatetruecolor($width, $height);
if ($new_image === false) {
return false;
}
// Fix transparency of gif/png image
if ($props['gd_type'] != IMAGETYPE_JPEG) {
imagealphablending($new_image, false);
imagesavealpha($new_image, true);
$transparent = imagecolorallocatealpha($new_image, 255, 255, 255, 127);
imagefilledrectangle($new_image, 0, 0, $width, $height, $transparent);
}
imagecopyresampled($new_image, $image, 0, 0, 0, 0, $width, $height, $props['width'], $props['height']);
$image = $new_image;
// fix orientation of image if EXIF data exists and specifies orientation (GD strips the EXIF data)
if ($this->image_file && $type == 'jpg' && function_exists('exif_read_data')) {
$exif = @exif_read_data($this->image_file);
if ($exif && $exif['Orientation']) {
switch ($exif['Orientation']) {
case 3:
$image = imagerotate($image, 180, 0);
break;
case 6:
$image = imagerotate($image, -90, 0);
break;
case 8:
$image = imagerotate($image, 90, 0);
break;
}
}
}
if ($props['gd_type'] == IMAGETYPE_JPEG) {
$result = imagejpeg($image, $filename, 75);
}
elseif($props['gd_type'] == IMAGETYPE_GIF) {
$result = imagegif($image, $filename);
}
elseif($props['gd_type'] == IMAGETYPE_PNG) {
$result = imagepng($image, $filename, 6, PNG_ALL_FILTERS);
}
}
if ($result) {
@chmod($filename, 0600);
return $type;
}
}
// @TODO: print error to the log?
return false;
}
/**
* Convert image to a given type
*
* @param int $type Destination file type (see class constants)
* @param string $filename Output filename (if empty, original file will be used
* and filename extension will be modified)
*
* @return bool True on success, False on failure
*/
public function convert($type, $filename = null)
{
$rcube = rcube::get_instance();
$convert = $rcube->config->get('im_convert_path', false);
if (!$filename) {
$filename = $this->image_file;
// modify extension
if ($extension = self::$extensions[$type]) {
$filename = preg_replace('/\.[^.]+$/', '', $filename) . '.' . $extension;
}
}
// use ImageMagick in command line
if ($convert) {
$p['in'] = $this->image_file;
$p['out'] = $filename;
$p['type'] = self::$extensions[$type];
$result = rcube::exec($convert . ' 2>&1 -colorspace sRGB -strip -quality 75 {in} {type}:{out}', $p);
if ($result === '') {
chmod($filename, 0600);
return true;
}
}
// use PHP's Imagick class
if (class_exists('Imagick', false)) {
try {
$image = new Imagick($this->image_file);
$image->setImageColorspace(Imagick::COLORSPACE_SRGB);
$image->setImageCompressionQuality(75);
$image->setImageFormat(self::$extensions[$type]);
$image->stripImage();
if ($image->writeImage($filename)) {
@chmod($filename, 0600);
return true;
}
}
catch (Exception $e) {
rcube::raise_error($e, true, false);
}
}
// use GD extension (TIFF isn't supported)
$props = $this->props();
// do we have enough memory? (#1489937)
if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN' && !$this->mem_check($props)) {
return false;
}
if ($props['gd_type']) {
if ($props['gd_type'] == IMAGETYPE_JPEG && function_exists('imagecreatefromjpeg')) {
$image = imagecreatefromjpeg($this->image_file);
}
else if ($props['gd_type'] == IMAGETYPE_GIF && function_exists('imagecreatefromgif')) {
$image = imagecreatefromgif($this->image_file);
}
else if ($props['gd_type'] == IMAGETYPE_PNG && function_exists('imagecreatefrompng')) {
$image = imagecreatefrompng($this->image_file);
}
else {
// @TODO: print error to the log?
return false;
}
if ($type == self::TYPE_JPG) {
$result = imagejpeg($image, $filename, 75);
}
else if ($type == self::TYPE_GIF) {
$result = imagegif($image, $filename);
}
else if ($type == self::TYPE_PNG) {
$result = imagepng($image, $filename, 6, PNG_ALL_FILTERS);
}
if ($result) {
@chmod($filename, 0600);
return true;
}
}
// @TODO: print error to the log?
return false;
}
/**
* Checks if image format conversion is supported
*
* @return boolean True if specified format can be converted to another format
*/
public static function is_convertable($mimetype = null)
{
$rcube = rcube::get_instance();
// @TODO: check if specified mimetype is really supported
return class_exists('Imagick', false) || $rcube->config->get('im_convert_path');
}
/**
* ImageMagick based image properties read.
*/
private function identify()
{
$rcube = rcube::get_instance();
// use ImageMagick in command line
if ($cmd = $rcube->config->get('im_identify_path')) {
$args = array('in' => $this->image_file, 'format' => "%m %[fx:w] %[fx:h]");
$id = rcube::exec($cmd. ' 2>/dev/null -format {format} {in}', $args);
if ($id) {
return explode(' ', strtolower($id));
}
}
// use PHP's Imagick class
if (class_exists('Imagick', false)) {
try {
$image = new Imagick($this->image_file);
return array(
strtolower($image->getImageFormat()),
$image->getImageWidth(),
$image->getImageHeight(),
);
}
catch (Exception $e) {}
}
}
/**
* Check if we have enough memory to load specified image
*/
private function mem_check($props)
{
// image size is unknown, we can't calculate required memory
if (!$props['width']) {
return true;
}
// channels: CMYK - 4, RGB - 3
$multip = ($props['channels'] ?: 3) + 1;
// calculate image size in memory (in bytes)
$size = $props['width'] * $props['height'] * $multip;
return rcube_utils::mem_check($size);
}
}

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