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<?php
/*
+-----------------------------------------------------------------------+
| This file is part of the Roundcube Webmail client |
| Copyright (C) 2005-2012, The Roundcube Dev Team |
| Copyright (C) 2011-2012, 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 $extensions = array(
self::TYPE_GIF => 'gif',
self::TYPE_JPG => 'jpg',
self::TYPE_PNG => 'png',
self::TYPE_TIF => 'tif',
);
function __construct($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'];
$type = image_type_to_extension($imsize['2'], false);
}
// use ImageMagick
if (!$type && ($data = $this->identify())) {
list($type, $width, $height) = $data;
}
if ($type) {
return array(
'type' => $type,
'gd_type' => $gd_type,
'width' => $width,
'height' => $height,
);
}
}
/**
* 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) {
$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, $filename)) ? '' : false;
}
else {
if ($scale >= 1) {
$width = $props['width'];
$height = $props['height'];
}
else {
$width = intval($props['width'] * $scale);
$height = intval($props['height'] * $scale);
}
$valid_types = "bmp,eps,gif,jp2,jpg,png,svg,tif";
$p += array(
'type' => $type,
'quality' => 75,
'size' => $width . 'x' . $height,
);
if (in_array($type, explode(',', $valid_types))) { // Valid type?
$result = rcube::exec($convert . ' 2>&1 -flatten -auto-orient -colorspace sRGB -strip'
. ' -quality {quality} -resize {size} {intype}:{in} {type}:{out}', $p);
}
}
if ($result === '') {
@chmod($filename, 0600);
return $type;
}
}
// use GD extension
if ($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);
$type = 'gid';
}
else if($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, $height);
// Fix transparency of gif/png image
if ($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 = $new_image;
if ($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) . '.' . $extension;
}
}
// use ImageMagick
if ($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 GD extension (TIFF isn't supported)
$props = $this->props();
if ($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;
}
/**
* Identify command handler.
*/
private function identify()
{
$rcube = rcube::get_instance();
if ($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));
}
}
}
}
