summaryrefslogtreecommitdiffstats
path: root/common/turbojpeg.c
blob: 09df17322bbde0dcf63253184a495629e79e6290 (plain)
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
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
/*
 * Copyright (C)2009-2012 D. R. Commander.  All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name of the libjpeg-turbo Project nor the names of its
 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/* TurboJPEG/OSS:  this implements the TurboJPEG API using libjpeg-turbo */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef JCS_EXTENSIONS
#define JPEG_INTERNAL_OPTIONS
#endif
#include <jpeglib.h>
#include <jerror.h>
#include <setjmp.h>
#include "./turbojpeg.h"

#define PAD(v, p) ((v+(p)-1)&(~((p)-1)))

#define CSTATE_START 100
#define DSTATE_START 200
#define MEMZERO(ptr, size) memset(ptr, 0, size)

#ifndef min
 #define min(a,b) ((a)<(b)?(a):(b))
#endif

#ifndef max
 #define max(a,b) ((a)>(b)?(a):(b))
#endif


/* Error handling (based on example in example.c) */

static char errStr[JMSG_LENGTH_MAX]="No error";

struct my_error_mgr
{
	struct jpeg_error_mgr pub;
	jmp_buf setjmp_buffer;
};
typedef struct my_error_mgr *my_error_ptr;

static void my_error_exit(j_common_ptr cinfo)
{
	my_error_ptr myerr=(my_error_ptr)cinfo->err;
	(*cinfo->err->output_message)(cinfo);
	longjmp(myerr->setjmp_buffer, 1);
}

/* Based on output_message() in jerror.c */

static void my_output_message(j_common_ptr cinfo)
{
	(*cinfo->err->format_message)(cinfo, errStr);
}


/* Global structures, macros, etc. */

enum {COMPRESS=1, DECOMPRESS=2};

typedef struct _tjinstance
{
	struct jpeg_compress_struct cinfo;
	struct jpeg_decompress_struct dinfo;
	struct jpeg_destination_mgr jdst;
	struct jpeg_source_mgr jsrc;
	struct my_error_mgr jerr;
	int init;
} tjinstance;

static const int pixelsize[TJ_NUMSAMP]={3, 3, 3, 1, 3};

#define NUMSF 4
static const tjscalingfactor sf[NUMSF]={
	{1, 1},
	{1, 2},
	{1, 4},
	{1, 8}
};

#define _throw(m) {snprintf(errStr, JMSG_LENGTH_MAX, "%s", m);  \
	retval=-1;  goto bailout;}
#define getinstance(handle) tjinstance *this=(tjinstance *)handle;  \
	j_compress_ptr cinfo=NULL;  j_decompress_ptr dinfo=NULL;  \
	(void) cinfo; (void) dinfo; /* silence warnings */ \
	if(!this) {snprintf(errStr, JMSG_LENGTH_MAX, "Invalid handle");  \
		return -1;}  \
	cinfo=&this->cinfo;  dinfo=&this->dinfo;

static int getPixelFormat(int pixelSize, int flags)
{
	if(pixelSize==1) return TJPF_GRAY;
	if(pixelSize==3)
	{
		if(flags&TJ_BGR) return TJPF_BGR;
		else return TJPF_RGB;
	}
	if(pixelSize==4)
	{
		if(flags&TJ_ALPHAFIRST)
		{
			if(flags&TJ_BGR) return TJPF_XBGR;
			else return TJPF_XRGB;
		}
		else
		{
			if(flags&TJ_BGR) return TJPF_BGRX;
			else return TJPF_RGBX;
		}
	}
	return -1;
}

static int setCompDefaults(struct jpeg_compress_struct *cinfo,
	int pixelFormat, int subsamp, int jpegQual)
{
	int retval=0;

	switch(pixelFormat)
	{
		case TJPF_GRAY:
			cinfo->in_color_space=JCS_GRAYSCALE;  break;
		#if JCS_EXTENSIONS==1
		case TJPF_RGB:
			cinfo->in_color_space=JCS_EXT_RGB;  break;
		case TJPF_BGR:
			cinfo->in_color_space=JCS_EXT_BGR;  break;
		case TJPF_RGBX:
		case TJPF_RGBA:
			cinfo->in_color_space=JCS_EXT_RGBX;  break;
		case TJPF_BGRX:
		case TJPF_BGRA:
			cinfo->in_color_space=JCS_EXT_BGRX;  break;
		case TJPF_XRGB:
		case TJPF_ARGB:
			cinfo->in_color_space=JCS_EXT_XRGB;  break;
		case TJPF_XBGR:
		case TJPF_ABGR:
			cinfo->in_color_space=JCS_EXT_XBGR;  break;
		#else
		case TJPF_RGB:
		case TJPF_BGR:
		case TJPF_RGBX:
		case TJPF_BGRX:
		case TJPF_XRGB:
		case TJPF_XBGR:
		case TJPF_RGBA:
		case TJPF_BGRA:
		case TJPF_ARGB:
		case TJPF_ABGR:
			cinfo->in_color_space=JCS_RGB;  pixelFormat=TJPF_RGB;
			break;
		#endif
	}

	cinfo->input_components=tjPixelSize[pixelFormat];
	jpeg_set_defaults(cinfo);
	if(jpegQual>=0)
	{
		jpeg_set_quality(cinfo, jpegQual, TRUE);
		if(jpegQual>=96) cinfo->dct_method=JDCT_ISLOW;
		else cinfo->dct_method=JDCT_FASTEST;
	}
	if(subsamp==TJSAMP_GRAY)
		jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
	else
		jpeg_set_colorspace(cinfo, JCS_YCbCr);

	cinfo->comp_info[0].h_samp_factor=tjMCUWidth[subsamp]/8;
	cinfo->comp_info[1].h_samp_factor=1;
	cinfo->comp_info[2].h_samp_factor=1;
	cinfo->comp_info[0].v_samp_factor=tjMCUHeight[subsamp]/8;
	cinfo->comp_info[1].v_samp_factor=1;
	cinfo->comp_info[2].v_samp_factor=1;

	return retval;
}

static int setDecompDefaults(struct jpeg_decompress_struct *dinfo,
	int pixelFormat)
{
	int retval=0;

	switch(pixelFormat)
	{
		case TJPF_GRAY:
			dinfo->out_color_space=JCS_GRAYSCALE;  break;
		#if JCS_EXTENSIONS==1
		case TJPF_RGB:
			dinfo->out_color_space=JCS_EXT_RGB;  break;
		case TJPF_BGR:
			dinfo->out_color_space=JCS_EXT_BGR;  break;
		case TJPF_RGBX:
			dinfo->out_color_space=JCS_EXT_RGBX;  break;
		case TJPF_BGRX:
			dinfo->out_color_space=JCS_EXT_BGRX;  break;
		case TJPF_XRGB:
			dinfo->out_color_space=JCS_EXT_XRGB;  break;
		case TJPF_XBGR:
			dinfo->out_color_space=JCS_EXT_XBGR;  break;
		#if JCS_ALPHA_EXTENSIONS==1
		case TJPF_RGBA:
			dinfo->out_color_space=JCS_EXT_RGBA;  break;
		case TJPF_BGRA:
			dinfo->out_color_space=JCS_EXT_BGRA;  break;
		case TJPF_ARGB:
			dinfo->out_color_space=JCS_EXT_ARGB;  break;
		case TJPF_ABGR:
			dinfo->out_color_space=JCS_EXT_ABGR;  break;
		#endif
		#else
		case TJPF_RGB:
		case TJPF_BGR:
		case TJPF_RGBX:
		case TJPF_BGRX:
		case TJPF_XRGB:
		case TJPF_XBGR:
		case TJPF_RGBA:
		case TJPF_BGRA:
		case TJPF_ARGB:
		case TJPF_ABGR:
			dinfo->out_color_space=JCS_RGB;  break;
		#endif
		default:
			_throw("Unsupported pixel format");
	}

	bailout:
	return retval;
}


static int getSubsamp(j_decompress_ptr dinfo)
{
	int retval=-1, i, k;
	for(i=0; i<NUMSUBOPT; i++)
	{
		if(dinfo->num_components==pixelsize[i])
		{
			if(dinfo->comp_info[0].h_samp_factor==tjMCUWidth[i]/8
				&& dinfo->comp_info[0].v_samp_factor==tjMCUHeight[i]/8)
			{
				int match=0;
				for(k=1; k<dinfo->num_components; k++)
				{
					if(dinfo->comp_info[k].h_samp_factor==1
						&& dinfo->comp_info[k].v_samp_factor==1)
						match++;
				}
				if(match==dinfo->num_components-1)
				{
					retval=i;  break;
				}
			}
		}
	}
	return retval;
}


#ifndef JCS_EXTENSIONS

/* Conversion functions to emulate the colorspace extensions.  This allows the
   TurboJPEG wrapper to be used with libjpeg */

#define TORGB(PS, ROFFSET, GOFFSET, BOFFSET) {  \
	int rowPad=pitch-width*PS;  \
	while(height--)  \
	{  \
		unsigned char *endOfRow=src+width*PS;  \
		while(src<endOfRow)  \
		{  \
			dst[RGB_RED]=src[ROFFSET];  \
			dst[RGB_GREEN]=src[GOFFSET];  \
			dst[RGB_BLUE]=src[BOFFSET];  \
			dst+=RGB_PIXELSIZE;  src+=PS;  \
		}  \
		src+=rowPad;  \
	}  \
}

static unsigned char *toRGB(unsigned char *src, int width, int pitch,
	int height, int pixelFormat, unsigned char *dst)
{
	unsigned char *retval=src;
	switch(pixelFormat)
	{
		case TJPF_RGB:
			#if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=3
			retval=dst;  TORGB(3, 0, 1, 2);
			#endif
			break;
		case TJPF_BGR:
			#if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=3
			retval=dst;  TORGB(3, 2, 1, 0);
			#endif
			break;
		case TJPF_RGBX:
		case TJPF_RGBA:
			#if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=4
			retval=dst;  TORGB(4, 0, 1, 2);
			#endif
			break;
		case TJPF_BGRX:
		case TJPF_BGRA:
			#if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=4
			retval=dst;  TORGB(4, 2, 1, 0);
			#endif
			break;
		case TJPF_XRGB:
		case TJPF_ARGB:
			#if RGB_RED!=1 || RGB_GREEN!=2 || RGB_BLUE!=3 || RGB_PIXELSIZE!=4
			retval=dst;  TORGB(4, 1, 2, 3);
			#endif
			break;
		case TJPF_XBGR:
		case TJPF_ABGR:
			#if RGB_RED!=3 || RGB_GREEN!=2 || RGB_BLUE!=1 || RGB_PIXELSIZE!=4
			retval=dst;  TORGB(4, 3, 2, 1);
			#endif
			break;
	}
	return retval;
}

#define FROMRGB(PS, ROFFSET, GOFFSET, BOFFSET, SETALPHA) {  \
	int rowPad=pitch-width*PS;  \
	while(height--)  \
	{  \
		unsigned char *endOfRow=dst+width*PS;  \
		while(dst<endOfRow)  \
		{  \
			dst[ROFFSET]=src[RGB_RED];  \
			dst[GOFFSET]=src[RGB_GREEN];  \
			dst[BOFFSET]=src[RGB_BLUE];  \
			SETALPHA  \
			dst+=PS;  src+=RGB_PIXELSIZE;  \
		}  \
		dst+=rowPad;  \
	}  \
}

static void fromRGB(unsigned char *src, unsigned char *dst, int width,
	int pitch, int height, int pixelFormat)
{
	switch(pixelFormat)
	{
		case TJPF_RGB:
			#if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=3
			FROMRGB(3, 0, 1, 2,);
			#endif
			break;
		case TJPF_BGR:
			#if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=3
			FROMRGB(3, 2, 1, 0,);
			#endif
			break;
		case TJPF_RGBX:
			#if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=4
			FROMRGB(4, 0, 1, 2,);
			#endif
			break;
		case TJPF_RGBA:
			#if RGB_RED!=0 || RGB_GREEN!=1 || RGB_BLUE!=2 || RGB_PIXELSIZE!=4
			FROMRGB(4, 0, 1, 2, dst[3]=0xFF;);
			#endif
			break;
		case TJPF_BGRX:
			#if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=4
			FROMRGB(4, 2, 1, 0,);
			#endif
			break;
		case TJPF_BGRA:
			#if RGB_RED!=2 || RGB_GREEN!=1 || RGB_BLUE!=0 || RGB_PIXELSIZE!=4
			FROMRGB(4, 2, 1, 0, dst[3]=0xFF;);  return;
			#endif
			break;
		case TJPF_XRGB:
			#if RGB_RED!=1 || RGB_GREEN!=2 || RGB_BLUE!=3 || RGB_PIXELSIZE!=4
			FROMRGB(4, 1, 2, 3,);  return;
			#endif
			break;
		case TJPF_ARGB:
			#if RGB_RED!=1 || RGB_GREEN!=2 || RGB_BLUE!=3 || RGB_PIXELSIZE!=4
			FROMRGB(4, 1, 2, 3, dst[0]=0xFF;);  return;
			#endif
			break;
		case TJPF_XBGR:
			#if RGB_RED!=3 || RGB_GREEN!=2 || RGB_BLUE!=1 || RGB_PIXELSIZE!=4
			FROMRGB(4, 3, 2, 1,);  return;
			#endif
			break;
		case TJPF_ABGR:
			#if RGB_RED!=3 || RGB_GREEN!=2 || RGB_BLUE!=1 || RGB_PIXELSIZE!=4
			FROMRGB(4, 3, 2, 1, dst[0]=0xFF;);  return;
			#endif
			break;
	}
}

#endif


/* General API functions */

DLLEXPORT char* DLLCALL tjGetErrorStr(void)
{
	return errStr;
}


DLLEXPORT int DLLCALL tjDestroy(tjhandle handle)
{
	getinstance(handle);
	if(setjmp(this->jerr.setjmp_buffer)) return -1;
	if(this->init&COMPRESS) jpeg_destroy_compress(cinfo);
	if(this->init&DECOMPRESS) jpeg_destroy_decompress(dinfo);
	free(this);
	return 0;
}


/* Compressor  */

static boolean empty_output_buffer(j_compress_ptr cinfo)
{
	ERREXIT(cinfo, JERR_BUFFER_SIZE);
	return TRUE;
}

static void dst_noop(j_compress_ptr cinfo)
{
}

static tjhandle _tjInitCompress(tjinstance *this)
{
	/* This is also straight out of example.c */
	this->cinfo.err=jpeg_std_error(&this->jerr.pub);
	this->jerr.pub.error_exit=my_error_exit;
	this->jerr.pub.output_message=my_output_message;

	if(setjmp(this->jerr.setjmp_buffer))
	{
		/* If we get here, the JPEG code has signaled an error. */
		if(this) free(this);  return NULL;
	}

	jpeg_create_compress(&this->cinfo);
	this->cinfo.dest=&this->jdst;
	this->jdst.init_destination=dst_noop;
	this->jdst.empty_output_buffer=empty_output_buffer;
	this->jdst.term_destination=dst_noop;

	this->init|=COMPRESS;
	return (tjhandle)this;
}

DLLEXPORT tjhandle DLLCALL tjInitCompress(void)
{
	tjinstance *this=NULL;
	if((this=(tjinstance *)malloc(sizeof(tjinstance)))==NULL)
	{
		snprintf(errStr, JMSG_LENGTH_MAX,
			"tjInitCompress(): Memory allocation failure");
		return NULL;
	}
	MEMZERO(this, sizeof(tjinstance));
	return _tjInitCompress(this);
}


DLLEXPORT unsigned long DLLCALL tjBufSize(int width, int height,
	int jpegSubsamp)
{
	unsigned long retval=0;  int mcuw, mcuh, chromasf;
	if(width<1 || height<1 || jpegSubsamp<0 || jpegSubsamp>=NUMSUBOPT)
		_throw("tjBufSize(): Invalid argument");

	/*
	 * This allows for rare corner cases in which a JPEG image can actually be
	 * larger than the uncompressed input (we wouldn't mention it if it hadn't
	 * happened before.)
	 */
	mcuw=tjMCUWidth[jpegSubsamp];
	mcuh=tjMCUHeight[jpegSubsamp];
	chromasf=jpegSubsamp==TJSAMP_GRAY? 0: 4*64/(mcuw*mcuh);
	retval=PAD(width, mcuw) * PAD(height, mcuh) * (2 + chromasf) + 2048;

	bailout:
	return retval;
}


DLLEXPORT unsigned long DLLCALL TJBUFSIZE(int width, int height)
{
	unsigned long retval=0;
	if(width<1 || height<1)
		_throw("TJBUFSIZE(): Invalid argument");

	/*
	 * This allows for rare corner cases in which a JPEG image can actually be
	 * larger than the uncompressed input (we wouldn't mention it if it hadn't
	 * happened before.)
	 */
	retval=PAD(width, 16) * PAD(height, 16) * 6 + 2048;

	bailout:
	return retval;
}


DLLEXPORT int DLLCALL tjCompress2(tjhandle handle, unsigned char *srcBuf,
	int width, int pitch, int height, int pixelFormat, unsigned char **jpegBuf,
	unsigned long *jpegSize, int jpegSubsamp, int jpegQual, int flags)
{
	int i, retval=0;  JSAMPROW *row_pointer=NULL;
	#ifndef JCS_EXTENSIONS
	unsigned char *rgbBuf=NULL;
	#endif

	getinstance(handle)
	if((this->init&COMPRESS)==0)
		_throw("tjCompress2(): Instance has not been initialized for compression");

	if(srcBuf==NULL || width<=0 || pitch<0 || height<=0 || pixelFormat<0
		|| pixelFormat>=TJ_NUMPF || jpegBuf==NULL || jpegSize==NULL
		|| jpegSubsamp<0 || jpegSubsamp>=NUMSUBOPT || jpegQual<0 || jpegQual>100)
		_throw("tjCompress2(): Invalid argument");

	if(setjmp(this->jerr.setjmp_buffer))
	{
		/* If we get here, the JPEG code has signaled an error. */
		retval=-1;
		goto bailout;
	}

	if(pitch==0) pitch=width*tjPixelSize[pixelFormat];

	#ifndef JCS_EXTENSIONS
	if(pixelFormat!=TJPF_GRAY)
	{
		rgbBuf=(unsigned char *)malloc(width*height*RGB_PIXELSIZE);
		if(!rgbBuf) _throw("tjCompress2(): Memory allocation failure");
		srcBuf=toRGB(srcBuf, width, pitch, height, pixelFormat, rgbBuf);
		pitch=width*RGB_PIXELSIZE;
	}
	#endif

	cinfo->image_width=width;
	cinfo->image_height=height;

	if(flags&TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1");
	else if(flags&TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1");
	else if(flags&TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1");

	if(setCompDefaults(cinfo, pixelFormat, jpegSubsamp, jpegQual)==-1)
		return -1;

	this->jdst.next_output_byte=*jpegBuf;
	this->jdst.free_in_buffer=tjBufSize(width, height, jpegSubsamp);

	jpeg_start_compress(cinfo, TRUE);
	if((row_pointer=(JSAMPROW *)malloc(sizeof(JSAMPROW)*height))==NULL)
		_throw("tjCompress2(): Memory allocation failure");
	for(i=0; i<height; i++)
	{
		if(flags&TJFLAG_BOTTOMUP) row_pointer[i]=&srcBuf[(height-i-1)*pitch];
		else row_pointer[i]=&srcBuf[i*pitch];
	}
	while(cinfo->next_scanline<cinfo->image_height)
	{
		jpeg_write_scanlines(cinfo, &row_pointer[cinfo->next_scanline],
			cinfo->image_height-cinfo->next_scanline);
	}
	jpeg_finish_compress(cinfo);
 	*jpegSize=tjBufSize(width, height, jpegSubsamp)
		-(unsigned long)(this->jdst.free_in_buffer);

	bailout:
	if(cinfo->global_state>CSTATE_START) jpeg_abort_compress(cinfo);
	#ifndef JCS_EXTENSIONS
	if(rgbBuf) free(rgbBuf);
	#endif
	if(row_pointer) free(row_pointer);
	return retval;
}

DLLEXPORT int DLLCALL tjCompress(tjhandle handle, unsigned char *srcBuf,
	int width, int pitch, int height, int pixelSize, unsigned char *jpegBuf,
	unsigned long *jpegSize, int jpegSubsamp, int jpegQual, int flags)
{
	int retval=0;  unsigned long size;
	retval=tjCompress2(handle, srcBuf, width, pitch, height,
		getPixelFormat(pixelSize, flags), &jpegBuf, &size, jpegSubsamp, jpegQual,
		flags);
	*jpegSize=size;
	return retval;
}


/* Decompressor */

static boolean fill_input_buffer(j_decompress_ptr dinfo)
{
	ERREXIT(dinfo, JERR_BUFFER_SIZE);
	return TRUE;
}

static void skip_input_data(j_decompress_ptr dinfo, long num_bytes)
{
	dinfo->src->next_input_byte += (size_t) num_bytes;
	dinfo->src->bytes_in_buffer -= (size_t) num_bytes;
}

static void src_noop(j_decompress_ptr dinfo)
{
}

static tjhandle _tjInitDecompress(tjinstance *this)
{
	/* This is also straight out of example.c */
	this->dinfo.err=jpeg_std_error(&this->jerr.pub);
	this->jerr.pub.error_exit=my_error_exit;
	this->jerr.pub.output_message=my_output_message;

	if(setjmp(this->jerr.setjmp_buffer))
	{
		/* If we get here, the JPEG code has signaled an error. */
		if(this) free(this);  return NULL;
	}

	jpeg_create_decompress(&this->dinfo);
	this->dinfo.src=&this->jsrc;
	this->jsrc.init_source=src_noop;
	this->jsrc.fill_input_buffer=fill_input_buffer;
	this->jsrc.skip_input_data=skip_input_data;
	this->jsrc.resync_to_restart=jpeg_resync_to_restart;
	this->jsrc.term_source=src_noop;

	this->init|=DECOMPRESS;
	return (tjhandle)this;
}

DLLEXPORT tjhandle DLLCALL tjInitDecompress(void)
{
	tjinstance *this;
	if((this=(tjinstance *)malloc(sizeof(tjinstance)))==NULL)
	{
		snprintf(errStr, JMSG_LENGTH_MAX,
			"tjInitDecompress(): Memory allocation failure");
		return NULL;
	}
	MEMZERO(this, sizeof(tjinstance));
	return _tjInitDecompress(this);
}


DLLEXPORT int DLLCALL tjDecompressHeader2(tjhandle handle,
	unsigned char *jpegBuf, unsigned long jpegSize, int *width, int *height,
	int *jpegSubsamp)
{
	int retval=0;

	getinstance(handle);
	if((this->init&DECOMPRESS)==0)
		_throw("tjDecompressHeader2(): Instance has not been initialized for decompression");

	if(jpegBuf==NULL || jpegSize<=0 || width==NULL || height==NULL
		|| jpegSubsamp==NULL)
		_throw("tjDecompressHeader2(): Invalid argument");

	if(setjmp(this->jerr.setjmp_buffer))
	{
		/* If we get here, the JPEG code has signaled an error. */
		return -1;
	}

	this->jsrc.bytes_in_buffer=jpegSize;
	this->jsrc.next_input_byte=jpegBuf;
	jpeg_read_header(dinfo, TRUE);

	*width=dinfo->image_width;
	*height=dinfo->image_height;
	*jpegSubsamp=getSubsamp(dinfo);

	jpeg_abort_decompress(dinfo);

	if(*jpegSubsamp<0)
		_throw("tjDecompressHeader2(): Could not determine subsampling type for JPEG image");
	if(*width<1 || *height<1)
		_throw("tjDecompressHeader2(): Invalid data returned in header");

	bailout:
	return retval;
}

DLLEXPORT int DLLCALL tjDecompressHeader(tjhandle handle,
	unsigned char *jpegBuf, unsigned long jpegSize, int *width, int *height)
{
	int jpegSubsamp;
	return tjDecompressHeader2(handle, jpegBuf, jpegSize, width, height,
		&jpegSubsamp);
}


DLLEXPORT tjscalingfactor* DLLCALL tjGetScalingFactors(int *numscalingfactors)
{
	if(numscalingfactors==NULL)
	{
		snprintf(errStr, JMSG_LENGTH_MAX,
			"tjGetScalingFactors(): Invalid argument");
		return NULL;
	}

	*numscalingfactors=NUMSF;
	return (tjscalingfactor *)sf;
}


DLLEXPORT int DLLCALL tjDecompress2(tjhandle handle, unsigned char *jpegBuf,
	unsigned long jpegSize, unsigned char *dstBuf, int width, int pitch,
	int height, int pixelFormat, int flags)
{
	int i, retval=0;  JSAMPROW *row_pointer=NULL;
	int jpegwidth, jpegheight, scaledw, scaledh;
	#ifndef JCS_EXTENSIONS
	unsigned char *rgbBuf=NULL;
	unsigned char *_dstBuf=NULL;  int _pitch=0;
	#endif

	getinstance(handle);
	if((this->init&DECOMPRESS)==0)
		_throw("tjDecompress2(): Instance has not been initialized for decompression");

	if(jpegBuf==NULL || jpegSize<=0 || dstBuf==NULL || width<0 || pitch<0
		|| height<0 || pixelFormat<0 || pixelFormat>=TJ_NUMPF)
		_throw("tjDecompress2(): Invalid argument");

	if(flags&TJFLAG_FORCEMMX) putenv("JSIMD_FORCEMMX=1");
	else if(flags&TJFLAG_FORCESSE) putenv("JSIMD_FORCESSE=1");
	else if(flags&TJFLAG_FORCESSE2) putenv("JSIMD_FORCESSE2=1");

	if(setjmp(this->jerr.setjmp_buffer))
	{
		/* If we get here, the JPEG code has signaled an error. */
		retval=-1;
		goto bailout;
	}

	this->jsrc.bytes_in_buffer=jpegSize;
	this->jsrc.next_input_byte=jpegBuf;
	jpeg_read_header(dinfo, TRUE);
	if(setDecompDefaults(dinfo, pixelFormat)==-1)
	{
		retval=-1;  goto bailout;
	}

	if(flags&TJFLAG_FASTUPSAMPLE) dinfo->do_fancy_upsampling=FALSE;

	jpegwidth=dinfo->image_width;  jpegheight=dinfo->image_height;
	if(width==0) width=jpegwidth;
	if(height==0) height=jpegheight;
	for(i=0; i<NUMSF; i++)
	{
		scaledw=TJSCALED(jpegwidth, sf[i]);
		scaledh=TJSCALED(jpegheight, sf[i]);
		if(scaledw<=width && scaledh<=height)
				break;
	}
	if(scaledw>width || scaledh>height)
		_throw("tjDecompress2(): Could not scale down to desired image dimensions");
	width=scaledw;  height=scaledh;
	dinfo->scale_num=sf[i].num;
	dinfo->scale_denom=sf[i].denom;

	jpeg_start_decompress(dinfo);
	if(pitch==0) pitch=dinfo->output_width*tjPixelSize[pixelFormat];

	#ifndef JCS_EXTENSIONS
	if(pixelFormat!=TJPF_GRAY &&
		(RGB_RED!=tjRedOffset[pixelFormat] ||
			RGB_GREEN!=tjGreenOffset[pixelFormat] ||
			RGB_BLUE!=tjBlueOffset[pixelFormat] ||
			RGB_PIXELSIZE!=tjPixelSize[pixelFormat]))
	{
		rgbBuf=(unsigned char *)malloc(width*height*3);
		if(!rgbBuf) _throw("tjDecompress2(): Memory allocation failure");
		_pitch=pitch;  pitch=width*3;
		_dstBuf=dstBuf;  dstBuf=rgbBuf;
	}
	#endif

	if((row_pointer=(JSAMPROW *)malloc(sizeof(JSAMPROW)
		*dinfo->output_height))==NULL)
		_throw("tjDecompress2(): Memory allocation failure");
	for(i=0; i<(int)dinfo->output_height; i++)
	{
		if(flags&TJFLAG_BOTTOMUP)
			row_pointer[i]=&dstBuf[(dinfo->output_height-i-1)*pitch];
		else row_pointer[i]=&dstBuf[i*pitch];
	}
	while(dinfo->output_scanline<dinfo->output_height)
	{
		jpeg_read_scanlines(dinfo, &row_pointer[dinfo->output_scanline],
			dinfo->output_height-dinfo->output_scanline);
	}
	jpeg_finish_decompress(dinfo);

	#ifndef JCS_EXTENSIONS
	fromRGB(rgbBuf, _dstBuf, width, _pitch, height, pixelFormat);
	#endif

	bailout:
	if(dinfo->global_state>DSTATE_START) jpeg_abort_decompress(dinfo);
	#ifndef JCS_EXTENSIONS
	if(rgbBuf) free(rgbBuf);
	#endif
	if(row_pointer) free(row_pointer);
	return retval;
}

DLLEXPORT int DLLCALL tjDecompress(tjhandle handle, unsigned char *jpegBuf,
	unsigned long jpegSize, unsigned char *dstBuf, int width, int pitch,
	int height, int pixelSize, int flags)
{
	return tjDecompress2(handle, jpegBuf, jpegSize, dstBuf, width, pitch,
		height, getPixelFormat(pixelSize, flags), flags);
}
OpenPOWER on IntegriCloud