lib/private/legacy/image.php
<?php
/**
* @author Andreas Fischer <bantu@owncloud.com>
* @author Bartek Przybylski <bart.p.pl@gmail.com>
* @author Bart Visscher <bartv@thisnet.nl>
* @author Björn Schießle <bjoern@schiessle.org>
* @author Byron Marohn <combustible@live.com>
* @author Christopher Schäpers <kondou@ts.unde.re>
* @author Georg Ehrke <georg@owncloud.com>
* @author j-ed <juergen@eisfair.org>
* @author Joas Schilling <coding@schilljs.com>
* @author Johannes Willnecker <johannes@willnecker.com>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Olivier Paroz <github@oparoz.com>
* @author Robin Appelman <icewind@owncloud.com>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Thomas Tanghus <thomas@tanghus.net>
* @author Victor Dubiniuk <dubiniuk@owncloud.com>
*
* @copyright Copyright (c) 2018, ownCloud GmbH
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
use OC\Image\BmpToResource;
/**
* Class for basic image manipulation
*/
class OC_Image implements \OCP\IImage {
/** @var false|resource */
protected $resource = false; // tmp resource.
/** @var int */
protected $imageType = IMAGETYPE_PNG; // Default to png if file type isn't evident.
/** @var string */
protected $mimeType = 'image/png'; // Default to png
/** @var int */
protected $bitDepth = 24;
/** @var null|string */
protected $filePath = null;
/** @var finfo */
private $fileInfo;
/** @var \OCP\ILogger */
private $logger;
/** @var \OCP\IConfig */
private $config;
/** @var array|false */
private $exifData;
/**
* Get mime type for an image file.
*
* @param string|null $filePath The path to a local image file.
* @return string The mime type if the it could be determined, otherwise an empty string.
*/
public static function getMimeTypeForFile($filePath) {
// exif_imagetype throws "read error!" if file is less than 12 byte
if ($filePath !== null && \filesize($filePath) > 11) {
$imageType = \exif_imagetype($filePath);
} else {
$imageType = false;
}
return $imageType ? \image_type_to_mime_type($imageType) : '';
}
/**
* Constructor.
*
* @param resource|string $imageRef The path to a local file, a base64 encoded string or a resource created by
* an imagecreate* function.
* @param \OCP\ILogger $logger
* @param \OCP\IConfig $config
*/
public function __construct($imageRef = null, $logger = null, $config = null) {
$this->logger = $logger;
if ($logger === null) {
$this->logger = \OC::$server->getLogger();
}
$this->config = $config;
if ($config === null) {
$this->config = \OC::$server->getConfig();
}
if (\OC_Util::fileInfoLoaded()) {
$this->fileInfo = new finfo(FILEINFO_MIME_TYPE);
}
if ($imageRef !== null) {
$this->load($imageRef);
}
}
/**
* Determine whether the object contains an image resource.
*
* @return bool
*/
public function valid() { // apparently you can't name a method 'empty'...
return \is_resource($this->resource);
}
/**
* Returns the MIME type of the image or an empty string if no image is loaded.
*
* @return string
*/
public function mimeType() {
return $this->valid() ? $this->mimeType : '';
}
/**
* Returns the width of the image or -1 if no image is loaded.
*
* @return int
*/
public function width() {
return $this->valid() ? \imagesx($this->resource) : -1;
}
/**
* Returns the height of the image or -1 if no image is loaded.
*
* @return int
*/
public function height() {
return $this->valid() ? \imagesy($this->resource) : -1;
}
/**
* Returns the width when the image orientation is top-left.
*
* @return int
*/
public function widthTopLeft() {
$o = $this->getOrientation();
$this->logger->debug('OC_Image->widthTopLeft() Orientation: ' . $o, ['app' => 'core']);
switch ($o) {
case -1:
case 1:
case 2: // Not tested
case 3:
case 4: // Not tested
return $this->width();
case 5: // Not tested
case 6:
case 7: // Not tested
case 8:
return $this->height();
}
return $this->width();
}
/**
* Returns the height when the image orientation is top-left.
*
* @return int
*/
public function heightTopLeft() {
$o = $this->getOrientation();
$this->logger->debug('OC_Image->heightTopLeft() Orientation: ' . $o, ['app' => 'core']);
switch ($o) {
case -1:
case 1:
case 2: // Not tested
case 3:
case 4: // Not tested
return $this->height();
case 5: // Not tested
case 6:
case 7: // Not tested
case 8:
return $this->width();
}
return $this->height();
}
/**
* Outputs the image.
*
* @param string $mimeType
* @return bool
*/
public function show($mimeType = null) {
if ($mimeType === null) {
$mimeType = $this->mimeType();
}
\header('Content-Type: ' . $mimeType);
return $this->_output(null, $mimeType);
}
/**
* Saves the image.
*
* @param string $filePath
* @param string $mimeType
* @return bool
*/
public function save($filePath = null, $mimeType = null) {
if ($mimeType === null) {
$mimeType = $this->mimeType();
}
if ($filePath === null && $this->filePath === null) {
$this->logger->error(__METHOD__ . '(): called with no path.', ['app' => 'core']);
return false;
} elseif ($filePath === null && $this->filePath !== null) {
$filePath = $this->filePath;
}
return $this->_output($filePath, $mimeType);
}
/**
* Outputs/saves the image.
*
* @param string $filePath
* @param string $mimeType
* @return bool
* @throws Exception
*/
private function _output($filePath = null, $mimeType = null) {
if ($filePath) {
if (!\file_exists(\dirname($filePath))) {
\mkdir(\dirname($filePath), 0777, true);
}
if (!\is_writable(\dirname($filePath))) {
$this->logger->error(__METHOD__ . '(): Directory \'' . \dirname($filePath) . '\' is not writable.', ['app' => 'core']);
return false;
} elseif (\is_writable(\dirname($filePath)) && \file_exists($filePath) && !\is_writable($filePath)) {
$this->logger->error(__METHOD__ . '(): File \'' . $filePath . '\' is not writable.', ['app' => 'core']);
return false;
}
}
if (!$this->valid()) {
return false;
}
$imageType = $this->imageType;
if ($mimeType !== null) {
switch ($mimeType) {
case 'image/gif':
$imageType = IMAGETYPE_GIF;
break;
case 'image/jpeg':
$imageType = IMAGETYPE_JPEG;
break;
case 'image/webp':
$imageType = IMAGETYPE_WEBP;
break;
case 'image/png':
$imageType = IMAGETYPE_PNG;
break;
case 'image/x-xbitmap':
$imageType = IMAGETYPE_XBM;
break;
case 'image/bmp':
case 'image/x-ms-bmp':
$imageType = IMAGETYPE_BMP;
break;
default:
throw new Exception('\OC_Image::_output(): "' . $mimeType . '" is not supported when forcing a specific output format');
}
}
switch ($imageType) {
case IMAGETYPE_GIF:
$retVal = \imagegif($this->resource, $filePath);
break;
case IMAGETYPE_JPEG:
$retVal = \imagejpeg($this->resource, $filePath, (int)$this->config->getSystemValue('previewJPEGImageDisplayQuality', -1));
break;
case IMAGETYPE_WEBP:
$retVal = \imagewebp($this->resource, $filePath);
break;
case IMAGETYPE_PNG:
$retVal = \imagepng($this->resource, $filePath);
break;
case IMAGETYPE_XBM:
if (\function_exists('imagexbm')) {
$retVal = \imagexbm($this->resource, $filePath);
} else {
throw new Exception('\OC_Image::_output(): imagexbm() is not supported.');
}
break;
case IMAGETYPE_WBMP:
$retVal = \imagewbmp($this->resource, $filePath);
break;
case IMAGETYPE_BMP:
$retVal = \imagebmp($this->resource, $filePath, $this->bitDepth);
break;
default:
$retVal = \imagepng($this->resource, $filePath);
}
return $retVal;
}
/**
* Prints the image when called as $image().
*/
public function __invoke() {
return $this->show();
}
/**
* @return resource Returns the image resource in any.
*/
public function resource() {
return $this->resource;
}
/**
* @return null|string Returns the raw image data.
*/
public function data() {
if (!$this->valid()) {
return null;
}
\ob_start();
switch ($this->mimeType) {
case "image/png":
$res = \imagepng($this->resource);
break;
case "image/jpeg":
$res = \imagejpeg($this->resource);
break;
case "image/gif":
$res = \imagegif($this->resource);
break;
default:
$res = \imagepng($this->resource);
$this->logger->info('OC_Image->data. Could not guess mime-type, defaulting to png', ['app' => 'core']);
break;
}
if (!$res) {
$this->logger->error('OC_Image->data. Error getting image data.', ['app' => 'core']);
}
return \ob_get_clean();
}
/**
* @return string - base64 encoded, which is suitable for embedding in a VCard.
*/
public function __toString() {
return \base64_encode($this->data());
}
/**
* (I'm open for suggestions on better method name ;)
* Get the orientation based on EXIF data.
*
* @return int The orientation or -1 if no EXIF orientation data is available.
*/
public function getOrientation() {
return $this->exifData['Orientation'] ?? -1;
}
/**
* Loads EXIF data of a given image.
* Only supported when the image is loaded via path or handle.
*
* @param resource|string $file
*/
private function loadExifData($file) {
if (!\is_callable('exif_read_data')) {
$this->logger->debug('OC_Image->loadExifData() Exif module not enabled.', ['app' => 'core']);
return;
}
if (!\is_resource($file) && !\is_readable($file)) {
$this->logger->debug('OC_Image->loadExifData() No readable file or path set.', ['app' => 'core']);
return;
}
$detectedType = false;
if (\is_resource($file)) {
$detectedType = $this->detectImageTypeFromStream($file);
} else {
// it should be a string pointing to a valid file
$detectedType = \exif_imagetype($file);
}
if (\in_array($detectedType, [IMAGETYPE_JPEG, IMAGETYPE_TIFF_II, IMAGETYPE_TIFF_MM], true)) {
// as of 24/1/2023, "exif_read_data" only supports those image types
$this->exifData = \exif_read_data($file, 'IFD0');
} else {
// other image types aren't supported by the exif_read_data function, so
// the function should return false
$this->exifData = false;
}
}
/**
* Detect the image type from the stream.
* The detection code is copied from the php source code,
* from the exif extension. As such, it only detects jpeg
* and tiff formats.
* This is intended to be used only to check if the stream
* can be used with the "exif_read_data" function or not.
*/
private function detectImageTypeFromStream($stream) {
$detectedType = false;
\rewind($stream);
$bytes = \fread($stream, 2);
switch ($bytes) {
case "\xff\xd8":
$detectedType = IMAGETYPE_JPEG;
break;
case "II":
$nextBytes = \fread($stream, 2);
if ($nextBytes === "\x2a\x00") {
$detectedType = IMAGETYPE_TIFF_II;
}
break;
case "MM":
$nextBytes = \fread($stream, 2);
if ($nextBytes === "\x00\x2a") {
$detectedType = IMAGETYPE_TIFF_MM;
}
break;
}
return $detectedType;
}
/**
* (I'm open for suggestions on better method name ;)
* Fixes orientation based on EXIF data.
*
* @return bool.
*/
public function fixOrientation() {
$o = $this->getOrientation();
$this->logger->debug('OC_Image->fixOrientation() Orientation: ' . $o, ['app' => 'core']);
$rotate = 0;
$flip = false;
switch ($o) {
case -1:
return false; //Nothing to fix
case 1:
$rotate = 0;
break;
case 2:
$rotate = 0;
$flip = true;
break;
case 3:
$rotate = 180;
break;
case 4:
$rotate = 180;
$flip = true;
break;
case 5:
$rotate = 90;
$flip = true;
break;
case 6:
$rotate = 270;
break;
case 7:
$rotate = 270;
$flip = true;
break;
case 8:
$rotate = 90;
break;
}
if ($flip && \function_exists('imageflip')) {
\imageflip($this->resource, IMG_FLIP_HORIZONTAL);
}
if ($rotate) {
$res = \imagerotate($this->resource, $rotate, 0);
if ($res) {
if (\imagealphablending($res, true)) {
if (\imagesavealpha($res, true)) {
\imagedestroy($this->resource);
$this->resource = $res;
return true;
} else {
$this->logger->debug('OC_Image->fixOrientation() Error during alpha-saving', ['app' => 'core']);
return false;
}
} else {
$this->logger->debug('OC_Image->fixOrientation() Error during alpha-blending', ['app' => 'core']);
return false;
}
} else {
$this->logger->debug('OC_Image->fixOrientation() Error during orientation fixing', ['app' => 'core']);
return false;
}
}
return false;
}
/**
* Loads an image from a local file, a base64 encoded string or a resource created by an imagecreate* function.
*
* @param resource|string $imageRef The path to a local file, a base64 encoded string or a resource created by an imagecreate* function or a file resource (file handle ).
* @return resource|false An image resource or false on error
*/
public function load($imageRef) {
if (\is_resource($imageRef)) {
if (\get_resource_type($imageRef) == 'gd') {
$this->resource = $imageRef;
return $this->resource;
} elseif (\in_array(\get_resource_type($imageRef), ['file', 'stream'])) {
return $this->loadFromFileHandle($imageRef);
}
} elseif ($this->loadFromBase64($imageRef) !== false) {
return $this->resource;
} elseif ($this->loadFromFile($imageRef) !== false) {
return $this->resource;
} elseif ($this->loadFromData($imageRef) !== false) {
return $this->resource;
}
$this->logger->debug(__METHOD__ . '(): could not load anything. Giving up!', ['app' => 'core']);
return false;
}
/**
* Loads an image from an open file handle.
* It is the responsibility of the caller to position the pointer at the correct place and to close the handle again.
*
* @param resource $handle
* @return resource|false An image resource or false on error
*/
public function loadFromFileHandle($handle) {
$contents = \stream_get_contents($handle);
if ($this->loadFromData($contents)) {
$this->adjustStreamChunkSize($handle);
$this->loadExifData($handle);
return $this->resource;
}
return false;
}
/**
* Adjust the size of the chunks in the stream. This is required for
* the "exif_read_data" native method to read a whole chunk of metadata
* from the image in one go, otherwise there could be problems with
* the function.
*
* The expected max size of a metadata chunk should be 64 kB, at least for JPEG
* images.
*
* We'll adjust the chunk size only for custom wrappers (the stream_type
* should be "user-space") because those are the ones having this problem.
* Native streams seem to work without this workaround.
*
* This adjustment must be made in all the wrappers. This means that we must
* have access to all the wrapped streams and adjust the chunk size of all
* of them. A "getSource" method must be present in the custom wrapper
* providing access to the underlying stream, otherwise a warning will be
* logged because it could cause problems.
*/
private function adjustStreamChunkSize($handle) {
$stream = $handle;
$metadata = \stream_get_meta_data($stream);
while ($metadata['stream_type'] === 'user-space') {
\stream_set_chunk_size($stream, 64 * 1024);
if (isset($metadata['wrapper_data'])) {
$streamObj = $metadata['wrapper_data'];
if (\method_exists($streamObj, 'getSource')) {
// underlying stream must be adjusted too
$stream = $streamObj->getSource();
if (!$stream) {
// current streamObj doesn't wrap any other stream opened with `fopen`,
// or it's the last one of the chain
break;
}
$metadata = \stream_get_meta_data($stream);
} else {
// can't access to the underlying stream, so we'll stop here
$this->logger->warning(
"Cannot get the underlying stream of class " . \get_class($streamObj) .
" with uri {$metadata['uri']}. The " . \get_class($streamObj) .
" class should have a \"getSource\" method returning the underlying" .
" stream, or false / null if it isn't wrapping any other stream",
['app' => 'core']
);
break;
}
} else {
$this->logger->warning(
"No wrapper data found in the metadata of stream {$metadata['uri']}",
['app' => 'core']
);
break;
}
}
}
/**
* Loads an image from a local file.
*
* @param bool|string $imagePath The path to a local file.
* @return bool|resource An image resource or false on error
*/
public function loadFromFile($imagePath = false) {
// exif_imagetype throws "read error!" if file is less than 12 byte
if (!@\is_file($imagePath) || !\file_exists($imagePath) || \filesize($imagePath) < 12 || !\is_readable($imagePath)) {
return false;
}
$iType = \exif_imagetype($imagePath);
switch ($iType) {
case IMAGETYPE_GIF:
if (\imagetypes() & IMG_GIF) {
$this->resource = \imagecreatefromgif($imagePath);
// Preserve transparency
\imagealphablending($this->resource, true);
\imagesavealpha($this->resource, true);
} else {
$this->logger->debug('OC_Image->loadFromFile, GIF images not supported: ' . $imagePath, ['app' => 'core']);
}
break;
case IMAGETYPE_JPEG:
if (\imagetypes() & IMG_JPG) {
$this->resource = \imagecreatefromjpeg($imagePath);
} else {
$this->logger->debug('OC_Image->loadFromFile, JPG images not supported: ' . $imagePath, ['app' => 'core']);
}
break;
case IMAGETYPE_WEBP:
if (\imagetypes() & IMG_WEBP) {
$this->resource = \imagecreatefromwebp($imagePath);
} else {
$this->logger->debug('OC_Image->loadFromFile, WEBP images not supported: ' . $imagePath, ['app' => 'core']);
}
break;
case IMAGETYPE_PNG:
if (\imagetypes() & IMG_PNG) {
$this->resource = \imagecreatefrompng($imagePath);
// Preserve transparency
\imagealphablending($this->resource, true);
\imagesavealpha($this->resource, true);
} else {
$this->logger->debug('OC_Image->loadFromFile, PNG images not supported: ' . $imagePath, ['app' => 'core']);
}
break;
case IMAGETYPE_XBM:
if (\imagetypes() & IMG_XPM) {
$this->resource = \imagecreatefromxbm($imagePath);
} else {
$this->logger->debug('OC_Image->loadFromFile, XBM/XPM images not supported: ' . $imagePath, ['app' => 'core']);
}
break;
case IMAGETYPE_WBMP:
if (\imagetypes() & IMG_WBMP) {
$this->resource = \imagecreatefromwbmp($imagePath);
} else {
$this->logger->debug('OC_Image->loadFromFile, WBMP images not supported: ' . $imagePath, ['app' => 'core']);
}
break;
case IMAGETYPE_BMP:
$this->resource = $this->imagecreatefrombmp($imagePath);
break;
/*
case IMAGETYPE_TIFF_II: // (intel byte order)
break;
case IMAGETYPE_TIFF_MM: // (motorola byte order)
break;
case IMAGETYPE_JPC:
break;
case IMAGETYPE_JP2:
break;
case IMAGETYPE_JPX:
break;
case IMAGETYPE_JB2:
break;
case IMAGETYPE_SWC:
break;
case IMAGETYPE_IFF:
break;
case IMAGETYPE_ICO:
break;
case IMAGETYPE_SWF:
break;
case IMAGETYPE_PSD:
break;
*/
default:
// this is mostly file created from encrypted file
$this->resource = \imagecreatefromstring(\OC\Files\Filesystem::file_get_contents(\OC\Files\Filesystem::getLocalPath($imagePath)));
$iType = IMAGETYPE_PNG;
$this->logger->debug('OC_Image->loadFromFile, Default', ['app' => 'core']);
break;
}
if ($this->valid()) {
$this->loadExifData($imagePath);
$this->imageType = $iType;
$this->mimeType = \image_type_to_mime_type($iType);
$this->filePath = $imagePath;
}
return $this->resource;
}
/**
* Loads an image from a string of data.
*
* @param string $str A string of image data as read from a file.
* @return bool|resource An image resource or false on error
*/
public function loadFromData($str) {
if (\is_resource($str)) {
return false;
}
$this->resource = @\imagecreatefromstring($str);
if ($this->fileInfo) {
$this->mimeType = $this->fileInfo->buffer($str);
}
if (\is_resource($this->resource)) {
\imagealphablending($this->resource, false);
\imagesavealpha($this->resource, true);
}
if (!$this->resource) {
$this->logger->debug('OC_Image->loadFromFile, could not load', ['app' => 'core']);
return false;
}
return $this->resource;
}
/**
* Loads an image from a base64 encoded string.
*
* @param string $str A string base64 encoded string of image data.
* @return bool|resource An image resource or false on error
*/
public function loadFromBase64($str) {
if (!\is_string($str)) {
return false;
}
$data = \base64_decode($str);
if ($data) { // try to load from string data
$this->resource = @\imagecreatefromstring($data);
if ($this->fileInfo) {
$this->mimeType = $this->fileInfo->buffer($data);
}
if (!$this->resource) {
$this->logger->debug('OC_Image->loadFromBase64, could not load', ['app' => 'core']);
return false;
}
return $this->resource;
} else {
return false;
}
}
/**
* Create a new image from file or URL
* @param string $fileName <p>
* Path to the BMP image.
* @return bool|resource an image resource identifier on success, <b>FALSE</b> on errors.
*/
private function imagecreatefrombmp($fileName) {
try {
$bmp = new BmpToResource($fileName);
$imageHandle = $bmp->toResource();
$imageDetails = $bmp->getHeader();
$this->bitDepth = $imageDetails['bits']; //remember the bit depth for the imagebmp call
} catch (\Exception $e) {
$this->logger->warning($e->getMessage(), ['app' => 'core']);
return false;
}
return $imageHandle;
}
/**
* Resizes the image preserving ratio.
*
* @param integer $maxSize The maximum size of either the width or height.
* @return bool
*/
public function resize($maxSize) {
if (!$this->valid()) {
$this->logger->error(__METHOD__ . '(): No image loaded', ['app' => 'core']);
return false;
}
$widthOrig = \imagesx($this->resource);
$heightOrig = \imagesy($this->resource);
$ratioOrig = $widthOrig / $heightOrig;
if ($ratioOrig > 1) {
$newHeight = \round($maxSize / $ratioOrig);
$newWidth = $maxSize;
} else {
$newWidth = \round($maxSize * $ratioOrig);
$newHeight = $maxSize;
}
$this->preciseResize(\round($newWidth), \round($newHeight));
return true;
}
/**
* @param int $width
* @param int $height
* @return bool
*/
public function preciseResize($width, $height) {
if (!$this->valid()) {
$this->logger->error(__METHOD__ . '(): No image loaded', ['app' => 'core']);
return false;
}
$widthOrig = \imagesx($this->resource);
$heightOrig = \imagesy($this->resource);
$process = \imagecreatetruecolor($width, $height);
if ($process == false) {
$this->logger->error(__METHOD__ . '(): Error creating true color image', ['app' => 'core']);
\imagedestroy($process);
return false;
}
// preserve transparency
if ($this->imageType == IMAGETYPE_GIF or $this->imageType == IMAGETYPE_PNG) {
\imagecolortransparent($process, \imagecolorallocatealpha($process, 0, 0, 0, 127));
\imagealphablending($process, false);
\imagesavealpha($process, true);
}
\imagecopyresampled($process, $this->resource, 0, 0, 0, 0, $width, $height, $widthOrig, $heightOrig);
if ($process == false) {
$this->logger->error(__METHOD__ . '(): Error re-sampling process image', ['app' => 'core']);
\imagedestroy($process);
return false;
}
\imagedestroy($this->resource);
$this->resource = $process;
return true;
}
/**
* Crops the image to the middle square. If the image is already square it just returns.
*
* @param int $size maximum size for the result (optional)
* @return bool for success or failure
*/
public function centerCrop($size = 0) {
if (!$this->valid()) {
$this->logger->error('OC_Image->centerCrop, No image loaded', ['app' => 'core']);
return false;
}
$widthOrig = \imagesx($this->resource);
$heightOrig = \imagesy($this->resource);
if ($widthOrig === $heightOrig and $size == 0) {
return true;
}
$ratioOrig = $widthOrig / $heightOrig;
$width = $height = \min($widthOrig, $heightOrig);
if ($ratioOrig > 1) {
$x = ($widthOrig / 2) - ($width / 2);
$y = 0;
} else {
$y = ($heightOrig / 2) - ($height / 2);
$x = 0;
}
if ($size > 0) {
$targetWidth = $size;
$targetHeight = $size;
} else {
$targetWidth = $width;
$targetHeight = $height;
}
$process = \imagecreatetruecolor($targetWidth, $targetHeight);
if ($process == false) {
$this->logger->error('OC_Image->centerCrop, Error creating true color image', ['app' => 'core']);
\imagedestroy($process);
return false;
}
// preserve transparency
if ($this->imageType == IMAGETYPE_GIF or $this->imageType == IMAGETYPE_PNG) {
\imagecolortransparent($process, \imagecolorallocatealpha($process, 0, 0, 0, 127));
\imagealphablending($process, false);
\imagesavealpha($process, true);
}
\imagecopyresampled($process, $this->resource, 0, 0, $x, $y, $targetWidth, $targetHeight, $width, $height);
if ($process == false) {
$this->logger->error('OC_Image->centerCrop, Error re-sampling process image ' . $width . 'x' . $height, ['app' => 'core']);
\imagedestroy($process);
return false;
}
\imagedestroy($this->resource);
$this->resource = $process;
return true;
}
/**
* Crops the image from point $x$y with dimension $wx$h.
*
* @param int $x Horizontal position
* @param int $y Vertical position
* @param int $w Width
* @param int $h Height
* @return bool for success or failure
*/
public function crop($x, $y, $w, $h) {
if (!$this->valid()) {
$this->logger->error(__METHOD__ . '(): No image loaded', ['app' => 'core']);
return false;
}
$process = \imagecreatetruecolor($w, $h);
if ($process == false) {
$this->logger->error(__METHOD__ . '(): Error creating true color image', ['app' => 'core']);
\imagedestroy($process);
return false;
}
// preserve transparency
if ($this->imageType == IMAGETYPE_GIF or $this->imageType == IMAGETYPE_PNG) {
\imagecolortransparent($process, \imagecolorallocatealpha($process, 0, 0, 0, 127));
\imagealphablending($process, false);
\imagesavealpha($process, true);
}
\imagecopyresampled($process, $this->resource, 0, 0, $x, $y, $w, $h, $w, $h);
if ($process == false) {
$this->logger->error(__METHOD__ . '(): Error re-sampling process image ' . $w . 'x' . $h, ['app' => 'core']);
\imagedestroy($process);
return false;
}
\imagedestroy($this->resource);
$this->resource = $process;
return true;
}
/**
* Resizes the image to fit within a boundary while preserving ratio.
*
* Warning: Images smaller than $maxWidth x $maxHeight will end up being scaled up
*
* @param integer $maxWidth
* @param integer $maxHeight
* @return bool
*/
public function fitIn($maxWidth, $maxHeight) {
if (!$this->valid()) {
$this->logger->error(__METHOD__ . '(): No image loaded', ['app' => 'core']);
return false;
}
$widthOrig = \imagesx($this->resource);
$heightOrig = \imagesy($this->resource);
$ratio = $widthOrig / $heightOrig;
$newWidth = \min($maxWidth, $ratio * $maxHeight);
$newHeight = \min($maxHeight, $maxWidth / $ratio);
$this->preciseResize(\round($newWidth), \round($newHeight));
return true;
}
/**
* Shrinks larger images to fit within specified boundaries while preserving ratio.
*
* @param integer $maxWidth
* @param integer $maxHeight
* @return bool
*/
public function scaleDownToFit($maxWidth, $maxHeight) {
if (!$this->valid()) {
$this->logger->error(__METHOD__ . '(): No image loaded', ['app' => 'core']);
return false;
}
$widthOrig = \imagesx($this->resource);
$heightOrig = \imagesy($this->resource);
if ($widthOrig > $maxWidth || $heightOrig > $maxHeight) {
return $this->fitIn($maxWidth, $maxHeight);
}
return false;
}
/**
* Destroys the current image and resets the object
*/
public function destroy() {
if ($this->valid()) {
\imagedestroy($this->resource);
}
$this->resource = null;
}
public function __destruct() {
$this->destroy();
}
}
if (!\function_exists('imagebmp')) {
/**
* Output a BMP image to either the browser or a file
*
* @link http://www.ugia.cn/wp-data/imagebmp.php
* @author legend <legendsky@hotmail.com>
* @link http://www.programmierer-forum.de/imagebmp-gute-funktion-gefunden-t143716.htm
* @author mgutt <marc@gutt.it>
* @version 1.00
* @param resource $im
* @param string $fileName [optional] <p>The path to save the file to.</p>
* @param int $bit [optional] <p>Bit depth, (default is 24).</p>
* @param int $compression [optional]
* @return bool <b>TRUE</b> on success or <b>FALSE</b> on failure.
*/
function imagebmp($im, $fileName = '', $bit = 24, $compression = 0) {
if (!\in_array($bit, [1, 4, 8, 16, 24, 32])) {
$bit = 24;
} elseif ($bit == 32) {
$bit = 24;
}
$bits = \pow(2, $bit);
\imagetruecolortopalette($im, true, $bits);
$width = \imagesx($im);
$height = \imagesy($im);
$colorsNum = \imagecolorstotal($im);
$rgbQuad = '';
if ($bit <= 8) {
for ($i = 0; $i < $colorsNum; $i++) {
$colors = \imagecolorsforindex($im, $i);
$rgbQuad .= \chr($colors['blue']) . \chr($colors['green']) . \chr($colors['red']) . "\0";
}
$bmpData = '';
if ($compression == 0 || $bit < 8) {
$compression = 0;
$extra = '';
$padding = 4 - \ceil($width / (8 / $bit)) % 4;
if ($padding % 4 != 0) {
$extra = \str_repeat("\0", $padding);
}
for ($j = $height - 1; $j >= 0; $j--) {
$i = 0;
while ($i < $width) {
$bin = 0;
$limit = $width - $i < 8 / $bit ? (8 / $bit - $width + $i) * $bit : 0;
for ($k = 8 - $bit; $k >= $limit; $k -= $bit) {
$index = \imagecolorat($im, $i, $j);
$bin |= $index << $k;
$i++;
}
$bmpData .= \chr($bin);
}
$bmpData .= $extra;
}
} // RLE8
elseif ($compression == 1 && $bit == 8) {
for ($j = $height - 1; $j >= 0; $j--) {
$lastIndex = "\0";
$sameNum = 0;
for ($i = 0; $i <= $width; $i++) {
$index = \imagecolorat($im, $i, $j);
if ($index !== $lastIndex || $sameNum > 255) {
if ($sameNum != 0) {
$bmpData .= \chr($sameNum) . \chr($lastIndex);
}
$lastIndex = $index;
$sameNum = 1;
} else {
$sameNum++;
}
}
$bmpData .= "\0\0";
}
$bmpData .= "\0\1";
}
$sizeQuad = \strlen($rgbQuad);
$sizeData = \strlen($bmpData);
} else {
$extra = '';
$padding = 4 - ($width * ($bit / 8)) % 4;
if ($padding % 4 != 0) {
$extra = \str_repeat("\0", $padding);
}
$bmpData = '';
for ($j = $height - 1; $j >= 0; $j--) {
for ($i = 0; $i < $width; $i++) {
$index = \imagecolorat($im, $i, $j);
$colors = \imagecolorsforindex($im, $index);
if ($bit == 16) {
$bin = 0 << $bit;
$bin |= ($colors['red'] >> 3) << 10;
$bin |= ($colors['green'] >> 3) << 5;
$bin |= $colors['blue'] >> 3;
$bmpData .= \pack("v", $bin);
} else {
$bmpData .= \pack("c*", $colors['blue'], $colors['green'], $colors['red']);
}
}
$bmpData .= $extra;
}
$sizeQuad = 0;
$sizeData = \strlen($bmpData);
$colorsNum = 0;
}
$fileHeader = 'BM' . \pack('V3', 54 + $sizeQuad + $sizeData, 0, 54 + $sizeQuad);
$infoHeader = \pack('V3v2V*', 0x28, $width, $height, 1, $bit, $compression, $sizeData, 0, 0, $colorsNum, 0);
if ($fileName != '') {
$fp = \fopen($fileName, 'wb');
\fwrite($fp, $fileHeader . $infoHeader . $rgbQuad . $bmpData);
\fclose($fp);
return true;
}
echo $fileHeader . $infoHeader . $rgbQuad . $bmpData;
return true;
}
}
if (!\function_exists('exif_imagetype')) {
/**
* Workaround if exif_imagetype does not exist
*
* @link http://www.php.net/manual/en/function.exif-imagetype.php#80383
* @param string $fileName
* @return string|boolean
*/
function exif_imagetype($fileName) {
if (($info = \getimagesize($fileName)) !== false) {
return $info[2];
}
return false;
}
}