1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
|
<?php
/**
* ownCloud
*
* @author Thomas Tanghus
* @copyright 2011 Thomas Tanghus <thomas@tanghus.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library 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 along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
//From user comments at http://dk2.php.net/manual/en/function.exif-imagetype.php
if ( ! function_exists( 'exif_imagetype' ) ) {
function exif_imagetype ( $filename ) {
if ( ( list($width, $height, $type, $attr) = getimagesize( $filename ) ) !== false ) {
return $type;
}
return false;
}
}
function ellipsis($str, $maxlen) {
if (strlen($str) > $maxlen) {
$characters = floor($maxlen / 2);
return substr($str, 0, $characters) . '...' . substr($str, -1 * $characters);
}
return $str;
}
/**
* Class for basic image manipulation
*
*/
class OC_Image {
protected $resource = false; // tmp resource.
protected $imagetype = IMAGETYPE_PNG; // Default to png if file type isn't evident.
protected $filepath = null;
/**
* @brief Get mime type for an image file.
* @param $filepath The path to a local image file.
* @returns string The mime type if the it could be determined, otherwise an empty string.
*/
static public function getMimeTypeForFile($filepath) {
$imagetype = exif_imagetype($filepath);
return $imagetype ? image_type_to_mime_type($imagetype) : '';
}
/**
* @brief Constructor.
* @param $imageref The path to a local file, a base64 encoded string or a resource created by an imagecreate* function.
* @returns bool False on error
*/
public function __construct($imageref = null) {
//OC_Log::write('core',__METHOD__.'(): start', OC_Log::DEBUG);
if(!extension_loaded('gd') || !function_exists('gd_info')) {
//if(!function_exists('imagecreatefromjpeg')) {
OC_Log::write('core',__METHOD__.'(): GD module not installed', OC_Log::ERROR);
return false;
}
if(!is_null($imageref)) {
$this->load($imageref);
}
}
/**
* @brief Determine whether the object contains an image resource.
* @returns bool
*/
public function valid() { // apparently you can't name a method 'empty'...
return is_resource($this->resource);
}
/**
* @brief Returns the MIME type of the image or an empty string if no image is loaded.
* @returns int
*/
public function mimeType() {
return $this->valid() ? image_type_to_mime_type($this->imagetype) : '';
}
/**
* @brief Returns the width of the image or -1 if no image is loaded.
* @returns int
*/
public function width() {
return $this->valid() ? imagesx($this->resource) : -1;
}
/**
* @brief Returns the height of the image or -1 if no image is loaded.
* @returns int
*/
public function height() {
return $this->valid() ? imagesy($this->resource) : -1;
}
/**
* @brief Outputs the image.
* @returns bool
*/
public function show() {
header('Content-Type: '.$this->mimeType());
return $this->_output();
}
/**
* @brief Saves the image.
* @returns bool
*/
public function save($filepath=null) {
if($filepath === null && $this->filepath === null) {
OC_Log::write('core',__METHOD__.'(): called with no path.', OC_Log::ERROR);
return false;
} elseif($filepath === null && $this->filepath !== null) {
$filepath = $this->filepath;
}
return $this->_output($filepath);
}
/**
* @brief Outputs/saves the image.
*/
private function _output($filepath=null) {
if($filepath) {
if (!file_exists(dirname($filepath)))
mkdir(dirname($filepath), 0777, true);
if(!is_writable(dirname($filepath))) {
OC_Log::write('core',__METHOD__.'(): Directory \''.dirname($filepath).'\' is not writable.', OC_Log::ERROR);
return false;
} elseif(is_writable(dirname($filepath)) && file_exists($filepath) && !is_writable($filepath)) {
OC_Log::write('core',__METHOD__.'(): File \''.$filepath.'\' is not writable.', OC_Log::ERROR);
return false;
}
}
if (!$this->valid()) {
return false;
}
$retval = false;
switch($this->imagetype) {
case IMAGETYPE_GIF:
$retval = imagegif($this->resource, $filepath);
break;
case IMAGETYPE_JPEG:
$retval = imagejpeg($this->resource, $filepath);
break;
case IMAGETYPE_PNG:
$retval = imagepng($this->resource, $filepath);
break;
case IMAGETYPE_XBM:
$retval = imagexbm($this->resource, $filepath);
break;
case IMAGETYPE_WBMP:
case IMAGETYPE_BMP:
$retval = imagewbmp($this->resource, $filepath);
break;
default:
$retval = imagepng($this->resource, $filepath);
}
return $retval;
}
/**
* @brief Prints the image when called as $image().
*/
public function __invoke() {
return $this->show();
}
/**
* @returns Returns the image resource in any.
*/
public function resource() {
return $this->resource;
}
/**
* @returns Returns a base64 encoded string suitable for embedding in a VCard.
*/
function __toString() {
ob_start();
$res = imagepng($this->resource);
if (!$res) {
OC_Log::write('core','OC_Image->__toString. Error writing image',OC_Log::ERROR);
}
return base64_encode(ob_get_clean());
}
/**
* (I'm open for suggestions on better method name ;)
* @brief Fixes orientation based on EXIF data.
* @returns bool.
*/
public function fixOrientation() {
if(!is_callable('exif_read_data')){
OC_Log::write('core','OC_Image->fixOrientation() Exif module not enabled.', OC_Log::DEBUG);
return false;
}
if(!$this->valid()) {
OC_Log::write('core','OC_Image->fixOrientation() No image loaded.', OC_Log::DEBUG);
return false;
}
if(is_null($this->filepath) || !is_readable($this->filepath)) {
OC_Log::write('core','OC_Image->fixOrientation() No readable file path set.', OC_Log::DEBUG);
return false;
}
$exif = @exif_read_data($this->filepath, 'IFD0');
if(!$exif) {
return false;
}
if(!isset($exif['Orientation'])) {
return true; // Nothing to fix
}
$o = $exif['Orientation'];
OC_Log::write('core','OC_Image->fixOrientation() Orientation: '.$o, OC_Log::DEBUG);
$rotate = 0;
$flip = false;
switch($o) {
case 1:
$rotate = 0;
$flip = false;
break;
case 2: // Not tested
$rotate = 0;
$flip = true;
break;
case 3:
$rotate = 180;
$flip = false;
break;
case 4: // Not tested
$rotate = 180;
$flip = true;
break;
case 5: // Not tested
$rotate = 90;
$flip = true;
break;
case 6:
//$rotate = 90;
$rotate = 270;
$flip = false;
break;
case 7: // Not tested
$rotate = 270;
$flip = true;
break;
case 8:
$rotate = 90;
$flip = false;
break;
}
if($rotate) {
$res = imagerotate($this->resource, $rotate, -1);
if($res) {
if(imagealphablending($res, true)) {
if(imagesavealpha($res, true)) {
imagedestroy($this->resource);
$this->resource = $res;
return true;
} else {
OC_Log::write('core','OC_Image->fixOrientation() Error during alphasaving.', OC_Log::DEBUG);
return false;
}
} else {
OC_Log::write('core','OC_Image->fixOrientation() Error during alphablending.', OC_Log::DEBUG);
return false;
}
} else {
OC_Log::write('core','OC_Image->fixOrientation() Error during oriention fixing.', OC_Log::DEBUG);
return false;
}
}
}
/**
* @brief Loads an image from a local file, a base64 encoded string or a resource created by an imagecreate* function.
* @param $imageref The path to a local file, a base64 encoded string or a resource created by an imagecreate* function or a file resource (file handle ).
* @returns An image resource or false on error
*/
public function load($imageref) {
if(is_resource($imageref)) {
if(get_resource_type($imageref) == 'gd') {
$this->resource = $res;
return $this->resource;
} elseif(in_array(get_resource_type($imageref), array('file','stream'))) {
return $this->loadFromFileHandle($imageref);
}
} elseif($this->loadFromFile($imageref) !== false) {
return $this->resource;
} elseif($this->loadFromBase64($imageref) !== false) {
return $this->resource;
} elseif($this->loadFromData($imageref) !== false) {
return $this->resource;
} else {
OC_Log::write('core',__METHOD__.'(): couldn\'t load anything. Giving up!', OC_Log::DEBUG);
return false;
}
}
/**
* @brief 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 $handle
* @returns An image resource or false on error
*/
public function loadFromFileHandle($handle) {
OC_Log::write('core',__METHOD__.'(): Trying', OC_Log::DEBUG);
$contents = stream_get_contents($handle);
if($this->loadFromData($contents)) {
return $this->resource;
}
}
/**
* @brief Loads an image from a local file.
* @param $imageref The path to a local file.
* @returns An image resource or false on error
*/
public function loadFromFile($imagepath=false) {
if(!is_file($imagepath) || !file_exists($imagepath) || !is_readable($imagepath)) {
// Debug output disabled because this method is tried before loadFromBase64?
OC_Log::write('core','OC_Image->loadFromFile, couldn\'t load: '.ellipsis($imagepath, 50), OC_Log::DEBUG);
return false;
}
$itype = exif_imagetype($imagepath);
switch($itype) {
case IMAGETYPE_GIF:
if (imagetypes() & IMG_GIF) {
$this->resource = imagecreatefromgif($imagepath);
} else {
OC_Log::write('core','OC_Image->loadFromFile, GIF images not supported: '.$imagepath, OC_Log::DEBUG);
}
break;
case IMAGETYPE_JPEG:
if (imagetypes() & IMG_JPG) {
$this->resource = imagecreatefromjpeg($imagepath);
} else {
OC_Log::write('core','OC_Image->loadFromFile, JPG images not supported: '.$imagepath, OC_Log::DEBUG);
}
break;
case IMAGETYPE_PNG:
if (imagetypes() & IMG_PNG) {
$this->resource = imagecreatefrompng($imagepath);
} else {
OC_Log::write('core','OC_Image->loadFromFile, PNG images not supported: '.$imagepath, OC_Log::DEBUG);
}
break;
case IMAGETYPE_XBM:
if (imagetypes() & IMG_XPM) {
$this->resource = imagecreatefromxbm($imagepath);
} else {
OC_Log::write('core','OC_Image->loadFromFile, XBM/XPM images not supported: '.$imagepath, OC_Log::DEBUG);
}
break;
case IMAGETYPE_WBMP:
case IMAGETYPE_BMP:
if (imagetypes() & IMG_WBMP) {
$this->resource = imagecreatefromwbmp($imagepath);
} else {
OC_Log::write('core','OC_Image->loadFromFile, (W)BMP images not supported: '.$imagepath, OC_Log::DEBUG);
}
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
$this->resource = imagecreatefromstring(\OC_Filesystem::file_get_contents(\OC_Filesystem::getLocalPath($imagepath)));
$itype = IMAGETYPE_PNG;
OC_Log::write('core','OC_Image->loadFromFile, Default', OC_Log::DEBUG);
break;
}
if($this->valid()) {
$this->imagetype = $itype;
$this->filepath = $imagepath;
}
return $this->resource;
}
/**
* @brief Loads an image from a string of data.
* @param $str A string of image data as read from a file.
* @returns An image resource or false on error
*/
public function loadFromData($str) {
if(is_resource($str)) {
return false;
}
$this->resource = @imagecreatefromstring($str);
if(!$this->resource) {
OC_Log::write('core','OC_Image->loadFromData, couldn\'t load', OC_Log::DEBUG);
return false;
}
return $this->resource;
}
/**
* @brief Loads an image from a base64 encoded string.
* @param $str A string base64 encoded string of image data.
* @returns An image resource or false on error
*/
public function loadFromBase64($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->resource) {
OC_Log::write('core','OC_Image->loadFromBase64, couldn\'t load', OC_Log::DEBUG);
return false;
}
return $this->resource;
} else {
return false;
}
}
/**
* @brief Resizes the image preserving ratio.
* @param $maxsize The maximum size of either the width or height.
* @returns bool
*/
public function resize($maxsize) {
if(!$this->valid()) {
OC_Log::write('core',__METHOD__.'(): No image loaded', OC_Log::ERROR);
return false;
}
$width_orig=imageSX($this->resource);
$height_orig=imageSY($this->resource);
$ratio_orig = $width_orig/$height_orig;
if ($ratio_orig > 1) {
$new_height = round($maxsize/$ratio_orig);
$new_width = $maxsize;
} else {
$new_width = round($maxsize*$ratio_orig);
$new_height = $maxsize;
}
$process = imagecreatetruecolor(round($new_width), round($new_height));
if ($process == false) {
OC_Log::write('core',__METHOD__.'(): Error creating true color image',OC_Log::ERROR);
imagedestroy($process);
return false;
}
imagecopyresampled($process, $this->resource, 0, 0, 0, 0, $new_width, $new_height, $width_orig, $height_orig);
if ($process == false) {
OC_Log::write('core',__METHOD__.'(): Error resampling process image '.$new_width.'x'.$new_height,OC_Log::ERROR);
imagedestroy($process);
return false;
}
imagedestroy($this->resource);
$this->resource = $process;
return true;
}
public function preciseResize($width, $height) {
if (!$this->valid()) {
OC_Log::write('core',__METHOD__.'(): No image loaded', OC_Log::ERROR);
return false;
}
$width_orig=imageSX($this->resource);
$height_orig=imageSY($this->resource);
$process = imagecreatetruecolor($width, $height);
if ($process == false) {
OC_Log::write('core',__METHOD__.'(): Error creating true color image',OC_Log::ERROR);
imagedestroy($process);
return false;
}
imagecopyresampled($process, $this->resource, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
if ($process == false) {
OC_Log::write('core',__METHOD__.'(): Error resampling process image '.$width.'x'.$height,OC_Log::ERROR);
imagedestroy($process);
return false;
}
imagedestroy($this->resource);
$this->resource = $process;
return true;
}
/**
* @brief Crops the image to the middle square. If the image is already square it just returns.
* @param int maximum size for the result (optional)
* @returns bool for success or failure
*/
public function centerCrop($size=0) {
if(!$this->valid()) {
OC_Log::write('core','OC_Image->centerCrop, No image loaded', OC_Log::ERROR);
return false;
}
$width_orig=imageSX($this->resource);
$height_orig=imageSY($this->resource);
if($width_orig === $height_orig and $size==0) {
return true;
}
$ratio_orig = $width_orig/$height_orig;
$width = $height = min($width_orig, $height_orig);
if ($ratio_orig > 1) {
$x = ($width_orig/2) - ($width/2);
$y = 0;
} else {
$y = ($height_orig/2) - ($height/2);
$x = 0;
}
if($size>0){
$targetWidth=$size;
$targetHeight=$size;
}else{
$targetWidth=$width;
$targetHeight=$height;
}
$process = imagecreatetruecolor($targetWidth, $targetHeight);
if ($process == false) {
OC_Log::write('core','OC_Image->centerCrop. Error creating true color image',OC_Log::ERROR);
imagedestroy($process);
return false;
}
imagecopyresampled($process, $this->resource, 0, 0, $x, $y, $targetWidth, $targetHeight, $width, $height);
if ($process == false) {
OC_Log::write('core','OC_Image->centerCrop. Error resampling process image '.$width.'x'.$height,OC_Log::ERROR);
imagedestroy($process);
return false;
}
imagedestroy($this->resource);
$this->resource = $process;
return true;
}
/**
* @brief Crops the image from point $x$y with dimension $wx$h.
* @param $x Horizontal position
* @param $y Vertical position
* @param $w Width
* @param $h Hight
* @returns bool for success or failure
*/
public function crop($x, $y, $w, $h) {
if(!$this->valid()) {
OC_Log::write('core',__METHOD__.'(): No image loaded', OC_Log::ERROR);
return false;
}
$width_orig=imageSX($this->resource);
$height_orig=imageSY($this->resource);
//OC_Log::write('core',__METHOD__.'(): Original size: '.$width_orig.'x'.$height_orig, OC_Log::DEBUG);
$process = imagecreatetruecolor($w, $h);
if ($process == false) {
OC_Log::write('core',__METHOD__.'(): Error creating true color image',OC_Log::ERROR);
imagedestroy($process);
return false;
}
imagecopyresampled($process, $this->resource, 0, 0, $x, $y, $w, $h, $w, $h);
if ($process == false) {
OC_Log::write('core',__METHOD__.'(): Error resampling process image '.$w.'x'.$h,OC_Log::ERROR);
imagedestroy($process);
return false;
}
imagedestroy($this->resource);
$this->resource = $process;
return true;
}
public function destroy(){
if($this->valid()){
imagedestroy($this->resource);
}
$this->resource=null;
}
public function __destruct(){
$this->destroy();
}
}
|