/**
* Shame that this was nicked from gdlib.php and that there isn't a function I could have used from there.
* Creates a resized version of image and stores copy in file area
*
* @param context $context
* @param string $component
* @param string filearea
* @param int $itemid
* @param stored_file $originalfile
* @param int $newwidth;
* @param int $newheight;
* @return stored_file
*/
public static function resize(\stored_file $originalfile, $resizefilename = false, $newwidth = false, $newheight = false, $jpgquality = 90)
{
if ($resizefilename === false) {
$resizefilename = $originalfile->get_filename();
}
if (!$newwidth && !$newheight) {
return false;
}
$contextid = $originalfile->get_contextid();
$component = $originalfile->get_component();
$filearea = $originalfile->get_filearea();
$itemid = $originalfile->get_itemid();
$imageinfo = (object) $originalfile->get_imageinfo();
$imagefnc = '';
if (empty($imageinfo)) {
return false;
}
// Create temporary image for processing.
$tmpimage = tempnam(sys_get_temp_dir(), 'tmpimg');
\file_put_contents($tmpimage, $originalfile->get_content());
if (!$newheight) {
$m = $imageinfo->height / $imageinfo->width;
// Multiplier to work out $newheight.
$newheight = $newwidth * $m;
} else {
if (!$newwidth) {
$m = $imageinfo->width / $imageinfo->height;
// Multiplier to work out $newwidth.
$newwidth = $newheight * $m;
}
}
$t = null;
switch ($imageinfo->mimetype) {
case 'image/gif':
if (\function_exists('imagecreatefromgif')) {
$im = \imagecreatefromgif($tmpimage);
} else {
\debugging('GIF not supported on this server');
unlink($tmpimage);
return false;
}
// Guess transparent colour from GIF.
$transparent = \imagecolortransparent($im);
if ($transparent != -1) {
$t = \imagecolorsforindex($im, $transparent);
}
break;
case 'image/jpeg':
if (\function_exists('imagecreatefromjpeg')) {
$im = \imagecreatefromjpeg($tmpimage);
} else {
\debugging('JPEG not supported on this server');
unlink($tmpimage);
return false;
}
// If the user uploads a jpeg them we should process as a jpeg if possible.
if (\function_exists('imagejpeg')) {
$imagefnc = 'imagejpeg';
$filters = null;
// Not used.
$quality = $jpgquality;
} else {
if (\function_exists('imagepng')) {
$imagefnc = 'imagepng';
$filters = PNG_NO_FILTER;
$quality = 1;
} else {
\debugging('Jpeg and png not supported on this server, please fix server configuration');
unlink($tmpimage);
return false;
}
}
break;
case 'image/png':
if (\function_exists('imagecreatefrompng')) {
$im = \imagecreatefrompng($tmpimage);
} else {
\debugging('PNG not supported on this server');
unlink($tmpimage);
return false;
}
break;
default:
unlink($tmpimage);
return false;
}
unlink($tmpimage);
// The default for all images other than jpegs is to try imagepng first.
if (empty($imagefnc)) {
if (\function_exists('imagepng')) {
$imagefnc = 'imagepng';
$filters = PNG_NO_FILTER;
$quality = 1;
} else {
if (\function_exists('imagejpeg')) {
$imagefnc = 'imagejpeg';
$filters = null;
// Not used.
$quality = $jpgquality;
} else {
\debugging('Jpeg and png not supported on this server, please fix server configuration');
return false;
}
}
}
if (\function_exists('imagecreatetruecolor')) {
$newimage = \imagecreatetruecolor($newwidth, $newheight);
if ($imageinfo->mimetype != 'image/jpeg' and $imagefnc === 'imagepng') {
if ($t) {
// Transparent GIF hacking...
$transparentcolour = \imagecolorallocate($newimage, $t['red'], $t['green'], $t['blue']);
\imagecolortransparent($newimage, $transparentcolour);
}
\imagealphablending($newimage, false);
$color = \imagecolorallocatealpha($newimage, 0, 0, 0, 127);
\imagefill($newimage, 0, 0, $color);
\imagesavealpha($newimage, true);
}
} else {
$newimage = \imagecreate($newwidth, $newheight);
}
\imagecopybicubic($newimage, $im, 0, 0, 0, 0, $newwidth, $newheight, $imageinfo->width, $imageinfo->height);
$fs = \get_file_storage();
$newimageparams = array('contextid' => $contextid, 'component' => $component, 'filearea' => $filearea, 'itemid' => $itemid, 'filepath' => '/');
\ob_start();
if (!$imagefnc($newimage, null, $quality, $filters)) {
return false;
}
$data = \ob_get_clean();
\imagedestroy($newimage);
$newimageparams['filename'] = $resizefilename;
if ($resizefilename == $originalfile->get_filename()) {
$originalfile->delete();
}
$file1 = $fs->create_file_from_string($newimageparams, $data);
return $file1;
}
/**
* Resize the image, if required, then generate an img tag and, if required, a link to the full-size image
* @param stored_file $file the image file to process
* @param int $maxwidth the maximum width allowed for the image
* @param int $maxheight the maximum height allowed for the image
* @return string HTML fragment to add to the label
*/
function label_generate_resized_image(stored_file $file, $maxwidth, $maxheight)
{
global $CFG;
$fullurl = moodle_url::make_draftfile_url($file->get_itemid(), $file->get_filepath(), $file->get_filename());
$link = null;
$attrib = array('alt' => $file->get_filename(), 'src' => $fullurl);
if ($imginfo = $file->get_imageinfo()) {
// Work out the new width / height, bounded by maxwidth / maxheight
$width = $imginfo['width'];
$height = $imginfo['height'];
if (!empty($maxwidth) && $width > $maxwidth) {
$height *= (double) $maxwidth / $width;
$width = $maxwidth;
}
if (!empty($maxheight) && $height > $maxheight) {
$width *= (double) $maxheight / $height;
$height = $maxheight;
}
$attrib['width'] = $width;
$attrib['height'] = $height;
// If the size has changed and the image is of a suitable mime type, generate a smaller version
if ($width != $imginfo['width']) {
$mimetype = $file->get_mimetype();
if ($mimetype === 'image/gif' or $mimetype === 'image/jpeg' or $mimetype === 'image/png') {
require_once $CFG->libdir . '/gdlib.php';
$tmproot = make_temp_directory('mod_label');
$tmpfilepath = $tmproot . '/' . $file->get_contenthash();
$file->copy_content_to($tmpfilepath);
$data = generate_image_thumbnail($tmpfilepath, $width, $height);
unlink($tmpfilepath);
if (!empty($data)) {
$fs = get_file_storage();
$record = array('contextid' => $file->get_contextid(), 'component' => $file->get_component(), 'filearea' => $file->get_filearea(), 'itemid' => $file->get_itemid(), 'filepath' => '/', 'filename' => 's_' . $file->get_filename());
$smallfile = $fs->create_file_from_string($record, $data);
// Replace the image 'src' with the resized file and link to the original
$attrib['src'] = moodle_url::make_draftfile_url($smallfile->get_itemid(), $smallfile->get_filepath(), $smallfile->get_filename());
$link = $fullurl;
}
}
}
} else {
// Assume this is an image type that get_imageinfo cannot handle (e.g. SVG)
$attrib['width'] = $maxwidth;
}
$img = html_writer::empty_tag('img', $attrib);
if ($link) {
return html_writer::link($link, $img);
} else {
return $img;
}
}
/**
* Get the image details from a file and return them.
* @param stored_file $file
* @param $pagecount
* @return mixed array|false
*/
protected static function get_image_details($file, $pagecount)
{
if ($imageinfo = $file->get_imageinfo()) {
$imgurl = moodle_url::make_pluginfile_url($file->get_contextid(), $file->get_component(), $file->get_filearea(), $file->get_itemid(), $file->get_filepath(), $file->get_filename());
// Prevent browser from caching image if it has changed.
$imgurl->param('ts', $file->get_timemodified());
return array($imgurl, $imageinfo['width'], $imageinfo['height'], $pagecount);
}
// Something went wrong.
return false;
}
