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gdlib.php
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gdlib.php
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<?php
/**
* gdlib.php - Collection of routines in Moodle related to
* processing images using GD
*
* @author Martin Dougiamas etc
* @version $Id$
* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
* @package moodlecore
*/
/**
* short description (optional)
*
* long description
* @uses $CFG
* @param type? $dst_img description?
* @param type? $src_img description?
* @param type? $dst_x description?
* @param type? $dst_y description?
* @param type? $src_x description?
* @param type? $src_y description?
* @param type? $dst_w description?
* @param type? $dst_h description?
* @param type? $src_w description?
* @param type? $src_h description?
* @return ?
* @todo Finish documenting this function
*/
function ImageCopyBicubic ($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);
}
}
}
/**
* Delete profile images associated with user or group
* @param int $id user or group id
* @param string $dir type of entity - 'groups' or 'users'
* @return boolean success
*/
function delete_profile_image($id, $dir='users') {
global $CFG;
require_once $CFG->libdir.'/filelib.php';
$location = $CFG->dataroot .'/'. $dir .'/'. $id;
if (file_exists($location)) {
return fulldelete($location);
}
return true;
}
/**
* Given an upload manager with the right settings, this function performs a virus scan, and then scales and crops
* it and saves it in the right place to be a "user" or "group" image.
*
* @param int $id user or group id
* @param string $dir type of entity - groups, user, ...
* @return string $destination (profile image destination path) or false on error
*/
function create_profile_image_destination($id, $dir='user') {
global $CFG;
umask(0000);
if (!file_exists($CFG->dataroot .'/'. $dir)) {
if (!mkdir($CFG->dataroot .'/'. $dir, $CFG->directorypermissions)) {
return false;
}
}
if ($dir == 'user') {
$destination = make_user_directory($id, true);
} else {
$destination = "$CFG->dataroot/$dir/$id";
}
if (!file_exists($destination)) {
if (!make_upload_directory(str_replace($CFG->dataroot . '/', '', $destination))) {
return false;
}
}
return $destination;
}
/**
* Given an upload manager with the right settings, this function performs a virus scan, and then scales and crops
* it and saves it in the right place to be a "user" or "group" image.
*
* @param int $id user or group id
* @param object $uploadmanager object referencing the image
* @param string $dir type of entity - groups, user, ...
* @return boolean success
*/
function save_profile_image($id, $uploadmanager, $dir='user') {
if (!$uploadmanager) {
return false;
}
$destination = create_profile_image_destination($id, $dir);
if ($destination === false) {
return false;
}
if (!$uploadmanager->save_files($destination)) {
return false;
}
return process_profile_image($uploadmanager->get_new_filepath(), $destination);
}
/**
* Given a path to an image file this function scales and crops it and saves it in
* the right place to be a "user" or "group" image.
*
* @uses $CFG
* @param string $originalfile the path of the original image file
* @param string $destination the final destination directory of the profile image
* @return boolean
*/
function process_profile_image($originalfile, $destination) {
global $CFG;
if(!(is_file($originalfile) && is_dir($destination))) {
return false;
}
if (empty($CFG->gdversion)) {
return false;
}
$imageinfo = GetImageSize($originalfile);
if (empty($imageinfo)) {
if (file_exists($originalfile)) {
unlink($originalfile);
}
return false;
}
$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 {
notice('GIF not supported on this server');
unlink($originalfile);
return false;
}
break;
case IMAGETYPE_JPEG:
if (function_exists('ImageCreateFromJPEG')) {
$im = ImageCreateFromJPEG($originalfile);
} else {
notice('JPEG not supported on this server');
unlink($originalfile);
return false;
}
break;
case IMAGETYPE_PNG:
if (function_exists('ImageCreateFromPNG')) {
$im = ImageCreateFromPNG($originalfile);
} else {
notice('PNG not supported on this server');
unlink($originalfile);
return false;
}
break;
default:
unlink($originalfile);
return false;
}
unlink($originalfile);
if (function_exists('ImageCreateTrueColor') and $CFG->gdversion >= 2) {
$im1 = ImageCreateTrueColor(100,100);
$im2 = ImageCreateTrueColor(35,35);
} 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, $half*2);
if (function_exists('ImageJpeg')) {
@touch($destination .'/f1.jpg'); // Helps in Safe mode
@touch($destination .'/f2.jpg'); // Helps in Safe mode
if (ImageJpeg($im1, $destination .'/f1.jpg', 90) and
ImageJpeg($im2, $destination .'/f2.jpg', 95) ) {
@chmod($destination .'/f1.jpg', 0666);
@chmod($destination .'/f2.jpg', 0666);
return 1;
}
} else {
notify('PHP has not been configured to support JPEG images. Please correct this.');
}
return 0;
}
/**
* Given a user id this function scales and crops the user images to remove
* the one pixel black border.
*
* @uses $CFG
* @param int $id description?
* @return boolean
*/
function upgrade_profile_image($id, $dir='users') {
global $CFG;
$im = ImageCreateFromJPEG($CFG->dataroot .'/'. $dir .'/'. $id .'/f1.jpg');
if (function_exists('ImageCreateTrueColor') and $CFG->gdversion >= 2) {
$im1 = ImageCreateTrueColor(100,100);
$im2 = ImageCreateTrueColor(35,35);
} else {
$im1 = ImageCreate(100,100);
$im2 = ImageCreate(35,35);
}
if (function_exists('ImageCopyResampled') and $CFG->gdversion >= 2) {
ImageCopyBicubic($im1, $im, 0, 0, 2, 2, 100, 100, 96, 96);
} else {
imagecopy($im1, $im, 0, 0, 0, 0, 100, 100);
$c = ImageColorsForIndex($im1,ImageColorAt($im1,2,2));
$color = ImageColorClosest ($im1, $c['red'], $c['green'], $c['blue']);
ImageSetPixel ($im1, 0, 0, $color);
$c = ImageColorsForIndex($im1,ImageColorAt($im1,2,97));
$color = ImageColorClosest ($im1, $c['red'], $c['green'], $c['blue']);
ImageSetPixel ($im1, 0, 99, $color);
$c = ImageColorsForIndex($im1,ImageColorAt($im1,97,2));
$color = ImageColorClosest ($im1, $c['red'], $c['green'], $c['blue']);
ImageSetPixel ($im1, 99, 0, $color);
$c = ImageColorsForIndex($im1,ImageColorAt($im1,97,97));
$color = ImageColorClosest ($im1, $c['red'], $c['green'], $c['blue']);
ImageSetPixel ($im1, 99, 99, $color);
for ($x = 1; $x < 99; $x++) {
$c1 = ImageColorsForIndex($im1,ImageColorAt($im,$x,1));
$color = ImageColorClosest ($im, $c1['red'], $c1['green'], $c1['blue']);
ImageSetPixel ($im1, $x, 0, $color);
$c2 = ImageColorsForIndex($im1,ImageColorAt($im1,$x,98));
$color = ImageColorClosest ($im, $c2['red'], $c2['green'], $c2['blue']);
ImageSetPixel ($im1, $x, 99, $color);
}
for ($y = 1; $y < 99; $y++) {
$c3 = ImageColorsForIndex($im1,ImageColorAt($im, 1, $y));
$color = ImageColorClosest ($im, $c3['red'], $c3['green'], $c3['blue']);
ImageSetPixel ($im1, 0, $y, $color);
$c4 = ImageColorsForIndex($im1,ImageColorAt($im1, 98, $y));
$color = ImageColorClosest ($im, $c4['red'], $c4['green'], $c4['blue']);
ImageSetPixel ($im1, 99, $y, $color);
}
}
ImageCopyBicubic($im2, $im, 0, 0, 2, 2, 35, 35, 96, 96);
if (function_exists('ImageJpeg')) {
if (ImageJpeg($im1, $CFG->dataroot .'/'. $dir .'/'. $id .'/f1.jpg', 90) and
ImageJpeg($im2, $CFG->dataroot .'/'. $dir .'/'. $id .'/f2.jpg', 95) ) {
@chmod($CFG->dataroot .'/'. $dir .'/'. $id .'/f1.jpg', 0666);
@chmod($CFG->dataroot .'/'. $dir .'/'. $id .'/f2.jpg', 0666);
return 1;
}
} else {
notify('PHP has not been configured to support JPEG images. Please correct this.');
}
return 0;
}
?>