<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* gdlib.php - Collection of routines in Moodle related to
* processing images using GD
*
* @package core
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
*
* long description
* @global object
* @param object $dst_img
* @param object $src_img
* @param int $dst_x
* @param int $dst_y
* @param int $src_x
* @param int $src_y
* @param int $dst_w
* @param int $dst_h
* @param int $src_w
* @param int $src_h
* @return bool
* @todo Finish documenting this function
*/
function ImageCopyBicubic($dst_img, $src_img, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) {
global $CFG;
if (function_exists('ImageCopyResampled') and $CFG->gdversion >= 2) {
return ImageCopyResampled($dst_img, $src_img, $dst_x, $dst_y, $src_x, $src_y,
$dst_w, $dst_h, $src_w, $src_h);
}
$totalcolors = imagecolorstotal($src_img);
for ($i=0; $i<$totalcolors; $i++) {
if ($colors = ImageColorsForIndex($src_img, $i)) {
ImageColorAllocate($dst_img, $colors['red'], $colors['green'], $colors['blue']);
}
}
$scaleX = ($src_w - 1) / $dst_w;
$scaleY = ($src_h - 1) / $dst_h;
$scaleX2 = $scaleX / 2.0;
$scaleY2 = $scaleY / 2.0;
for ($j = 0; $j < $dst_h; $j++) {
$sY = $j * $scaleY;
for ($i = 0; $i < $dst_w; $i++) {
$sX = $i * $scaleX;
$c1 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX,(int)$sY+$scaleY2));
$c2 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX,(int)$sY));
$c3 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX+$scaleX2,(int)$sY+$scaleY2));
$c4 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX+$scaleX2,(int)$sY));
$red = (int) (($c1['red'] + $c2['red'] + $c3['red'] + $c4['red']) / 4);
$green = (int) (($c1['green'] + $c2['green'] + $c3['green'] + $c4['green']) / 4);
$blue = (int) (($c1['blue'] + $c2['blue'] + $c3['blue'] + $c4['blue']) / 4);
$color = ImageColorClosest ($dst_img, $red, $green, $blue);
ImageSetPixel ($dst_img, $i + $dst_x, $j + $dst_y, $color);
}
}
}
/**
* Stores optimised icon images in icon file area
*
* @param $context
* @param component
* @param $itemid
* @param $originalfile
* @return success
*/
function process_new_icon($context, $component, $filearea, $itemid, $originalfile) {
global $CFG;
if (empty($CFG->gdversion)) {
return false;
}
if (!is_file($originalfile)) {
return false;
}
$imageinfo = GetImageSize($originalfile);
if (empty($imageinfo)) {
return false;
}
$image = new stdClass();
$image->width = $imageinfo[0];
$image->height = $imageinfo[1];
$image->type = $imageinfo[2];
switch ($image->type) {
case IMAGETYPE_GIF:
if (function_exists('ImageCreateFromGIF')) {
$im = ImageCreateFromGIF($originalfile);
} else {
debugging('GIF not supported on this server');
return false;
}
break;
case IMAGETYPE_JPEG:
if (function_exists('ImageCreateFromJPEG')) {
$im = ImageCreateFromJPEG($originalfile);
} else {
debugging('JPEG not supported on this server');
return false;
}
break;
case IMAGETYPE_PNG:
if (function_exists('ImageCreateFromPNG')) {
$im = ImageCreateFromPNG($originalfile);
} else {
debugging('PNG not supported on this server');
return false;
}
break;
default:
return false;
}
if (function_exists('ImagePng')) {
$imagefnc = 'ImagePng';
$imageext = '.png';
$filters = PNG_NO_FILTER;
$quality = 1;
} else if (function_exists('ImageJpeg')) {
$imagefnc = 'ImageJpeg';
$imageext = '.jpg';
$filters = null; // not used
$quality = 90;
} else {
debugging('Jpeg and png not supported on this server, please fix server configuration');
return false;
}
if (function_exists('ImageCreateTrueColor') and $CFG->gdversion >= 2) {
$im1 = ImageCreateTrueColor(100,100);
$im2 = ImageCreateTrueColor(35,35);
if ($image->type == IMAGETYPE_PNG and $imagefnc === 'ImagePng') {
imagealphablending($im1, false);
$color = imagecolorallocatealpha($im1, 0, 0, 0, 127);
imagefill($im1, 0, 0, $color);
imagesavealpha($im1, true);
imagealphablending($im2, false);
$color = imagecolorallocatealpha($im2, 0, 0, 0, 127);
imagefill($im2, 0, 0, $color);
imagesavealpha($im2, true);
}
} else {
$im1 = ImageCreate(100,100);
$im2 = ImageCreate(35,35);
}
$cx = $image->width / 2;
$cy = $image->height / 2;
if ($image->width < $image->height) {
$half = floor($image->width / 2.0);
} else {
$half = floor($image->height / 2.0);
}
ImageCopyBicubic($im1, $im, 0, 0, $cx-$half, $cy-$half, 100, 100, $half*2, $half*2);
ImageCopyBicubic($im2, $im, 0, 0, $cx-$half, $cy-$half, 35, 35, $half*2, $half*2);
$fs = get_file_storage();
$icon = array('contextid'=>$context->id, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid, 'filepath'=>'/');
ob_start();
if (!$imagefnc($im1, NULL, $quality, $filters)) {
// keep old icons
ob_end_clean();
return false;
}
$data = ob_get_clean();
ImageDestroy($im1);
$icon['filename'] = 'f1'.$imageext;
$fs->delete_area_files($context->id, $component, $filearea, $itemid);
$fs->create_file_from_string($icon, $data);
ob_start();
if (!$imagefnc($im2, NULL, $quality, $filters)) {
ob_end_clean();
$fs->delete_area_files($context->id, $component, $filearea, $itemid);
return false;
}
$data = ob_get_clean();
ImageDestroy($im2);
$icon['filename'] = 'f2'.$imageext;
$fs->create_file_from_string($icon, $data);
return true;
}