source: liacs/MIR2010/Sample/cximage/ximajpg.cpp@ 93

Last change on this file since 93 was 93, checked in by Rick van der Zwet, 15 years ago

Sample implementation of professor
File size: 17.7 KB
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[93]1/*
2 * File: ximajpg.cpp
3 * Purpose: Platform Independent JPEG Image Class Loader and Writer
4 * 07/Aug/2001 Davide Pizzolato - www.xdp.it
5 * CxImage version 6.0.0 02/Feb/2008
6 */
7
8#include "ximajpg.h"
9
10#if CXIMAGE_SUPPORT_JPG
11
12#include "jpeg/jmorecfg.h"
13
14#include "ximaiter.h"
15
16#include <setjmp.h>
17
18struct jpg_error_mgr {
19 struct jpeg_error_mgr pub; /* "public" fields */
20 jmp_buf setjmp_buffer; /* for return to caller */
21 char* buffer; /* error message <CSC>*/
22};
23typedef jpg_error_mgr *jpg_error_ptr;
24
25////////////////////////////////////////////////////////////////////////////////
26// Here's the routine that will replace the standard error_exit method:
27////////////////////////////////////////////////////////////////////////////////
28static void
29ima_jpeg_error_exit (j_common_ptr cinfo)
30{
31 /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
32 jpg_error_ptr myerr = (jpg_error_ptr) cinfo->err;
33 /* Create the message */
34 myerr->pub.format_message (cinfo, myerr->buffer);
35 /* Send it to stderr, adding a newline */
36 /* Return control to the setjmp point */
37 longjmp(myerr->setjmp_buffer, 1);
38}
39////////////////////////////////////////////////////////////////////////////////
40CxImageJPG::CxImageJPG(): CxImage(CXIMAGE_FORMAT_JPG)
41{
42#if CXIMAGEJPG_SUPPORT_EXIF
43 m_exif = NULL;
44 memset(&m_exifinfo, 0, sizeof(EXIFINFO));
45#endif
46}
47////////////////////////////////////////////////////////////////////////////////
48CxImageJPG::~CxImageJPG()
49{
50#if CXIMAGEJPG_SUPPORT_EXIF
51 if (m_exif) delete m_exif;
52#endif
53}
54////////////////////////////////////////////////////////////////////////////////
55#if CXIMAGEJPG_SUPPORT_EXIF
56bool CxImageJPG::DecodeExif(CxFile * hFile)
57{
58 m_exif = new CxExifInfo(&m_exifinfo);
59 if (m_exif){
60 long pos=hFile->Tell();
61 m_exif->DecodeExif(hFile);
62 hFile->Seek(pos,SEEK_SET);
63 return m_exif->m_exifinfo->IsExif;
64 } else {
65 return false;
66 }
67}
68#endif //CXIMAGEJPG_SUPPORT_EXIF
69////////////////////////////////////////////////////////////////////////////////
70#if CXIMAGE_SUPPORT_DECODE
71////////////////////////////////////////////////////////////////////////////////
72bool CxImageJPG::Decode(CxFile * hFile)
73{
74
75 bool is_exif = false;
76#if CXIMAGEJPG_SUPPORT_EXIF
77 is_exif = DecodeExif(hFile);
78#endif
79
80 CImageIterator iter(this);
81 /* This struct contains the JPEG decompression parameters and pointers to
82 * working space (which is allocated as needed by the JPEG library).
83 */
84 struct jpeg_decompress_struct cinfo;
85 /* We use our private extension JPEG error handler. <CSC> */
86 struct jpg_error_mgr jerr;
87 jerr.buffer=info.szLastError;
88 /* More stuff */
89 JSAMPARRAY buffer; /* Output row buffer */
90 int row_stride; /* physical row width in output buffer */
91
92 /* In this example we want to open the input file before doing anything else,
93 * so that the setjmp() error recovery below can assume the file is open.
94 * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
95 * requires it in order to read binary files.
96 */
97
98 /* Step 1: allocate and initialize JPEG decompression object */
99 /* We set up the normal JPEG error routines, then override error_exit. */
100 cinfo.err = jpeg_std_error(&jerr.pub);
101 jerr.pub.error_exit = ima_jpeg_error_exit;
102
103 /* Establish the setjmp return context for my_error_exit to use. */
104 if (setjmp(jerr.setjmp_buffer)) {
105 /* If we get here, the JPEG code has signaled an error.
106 * We need to clean up the JPEG object, close the input file, and return.
107 */
108 jpeg_destroy_decompress(&cinfo);
109 return 0;
110 }
111 /* Now we can initialize the JPEG decompression object. */
112 jpeg_create_decompress(&cinfo);
113
114 /* Step 2: specify data source (eg, a file) */
115 //jpeg_stdio_src(&cinfo, infile);
116 CxFileJpg src(hFile);
117 cinfo.src = &src;
118
119 /* Step 3: read file parameters with jpeg_read_header() */
120 (void) jpeg_read_header(&cinfo, TRUE);
121
122 /* Step 4 <chupeev> handle decoder options*/
123 if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & DECODE_GRAYSCALE) != 0)
124 cinfo.out_color_space = JCS_GRAYSCALE;
125 if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & DECODE_QUANTIZE) != 0) {
126 cinfo.quantize_colors = TRUE;
127 cinfo.desired_number_of_colors = GetJpegQuality();
128 }
129 if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & DECODE_DITHER) != 0)
130 cinfo.dither_mode = m_nDither;
131 if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & DECODE_ONEPASS) != 0)
132 cinfo.two_pass_quantize = FALSE;
133 if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & DECODE_NOSMOOTH) != 0)
134 cinfo.do_fancy_upsampling = FALSE;
135
136//<DP>: Load true color images as RGB (no quantize)
137/* Step 4: set parameters for decompression */
138/* if (cinfo.jpeg_color_space!=JCS_GRAYSCALE) {
139 * cinfo.quantize_colors = TRUE;
140 * cinfo.desired_number_of_colors = 128;
141 *}
142 */ //</DP>
143
144 // Set the scale <ignacio>
145 cinfo.scale_denom = GetJpegScale();
146
147 // Borrowed the idea from GIF implementation <ignacio>
148 if (info.nEscape == -1) {
149 // Return output dimensions only
150 jpeg_calc_output_dimensions(&cinfo);
151 head.biWidth = cinfo.output_width;
152 head.biHeight = cinfo.output_height;
153 info.dwType = CXIMAGE_FORMAT_JPG;
154 jpeg_destroy_decompress(&cinfo);
155 return true;
156 }
157
158 /* Step 5: Start decompressor */
159 jpeg_start_decompress(&cinfo);
160
161 /* We may need to do some setup of our own at this point before reading
162 * the data. After jpeg_start_decompress() we have the correct scaled
163 * output image dimensions available, as well as the output colormap
164 * if we asked for color quantization.
165 */
166 //Create the image using output dimensions <ignacio>
167 //Create(cinfo.image_width, cinfo.image_height, 8*cinfo.output_components, CXIMAGE_FORMAT_JPG);
168 Create(cinfo.output_width, cinfo.output_height, 8*cinfo.output_components, CXIMAGE_FORMAT_JPG);
169
170 if (!pDib) longjmp(jerr.setjmp_buffer, 1); //<DP> check if the image has been created
171
172 if (is_exif){
173#if CXIMAGEJPG_SUPPORT_EXIF
174 if ((m_exifinfo.Xresolution != 0.0) && (m_exifinfo.ResolutionUnit != 0))
175 SetXDPI((long)(m_exifinfo.Xresolution/m_exifinfo.ResolutionUnit));
176 if ((m_exifinfo.Yresolution != 0.0) && (m_exifinfo.ResolutionUnit != 0))
177 SetYDPI((long)(m_exifinfo.Yresolution/m_exifinfo.ResolutionUnit));
178#endif
179 } else {
180 switch (cinfo.density_unit) {
181 case 0: // [andy] fix for aspect ratio...
182 if((cinfo.Y_density > 0) && (cinfo.X_density > 0)){
183 SetYDPI((long)(GetXDPI()*(float(cinfo.Y_density)/float(cinfo.X_density))));
184 }
185 break;
186 case 2: // [andy] fix: cinfo.X/Y_density is pixels per centimeter
187 SetXDPI((long)floor(cinfo.X_density * 2.54 + 0.5));
188 SetYDPI((long)floor(cinfo.Y_density * 2.54 + 0.5));
189 break;
190 default:
191 SetXDPI(cinfo.X_density);
192 SetYDPI(cinfo.Y_density);
193 }
194 }
195
196 if (cinfo.out_color_space==JCS_GRAYSCALE){
197 SetGrayPalette();
198 head.biClrUsed =256;
199 } else {
200 if (cinfo.quantize_colors){
201 SetPalette(cinfo.actual_number_of_colors, cinfo.colormap[0], cinfo.colormap[1], cinfo.colormap[2]);
202 head.biClrUsed=cinfo.actual_number_of_colors;
203 } else {
204 head.biClrUsed=0;
205 }
206 }
207
208 /* JSAMPLEs per row in output buffer */
209 row_stride = cinfo.output_width * cinfo.output_components;
210
211 /* Make a one-row-high sample array that will go away when done with image */
212 buffer = (*cinfo.mem->alloc_sarray)
213 ((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
214
215 /* Step 6: while (scan lines remain to be read) */
216 /* jpeg_read_scanlines(...); */
217 /* Here we use the library's state variable cinfo.output_scanline as the
218 * loop counter, so that we don't have to keep track ourselves.
219 */
220 iter.Upset();
221 while (cinfo.output_scanline < cinfo.output_height) {
222
223 if (info.nEscape) longjmp(jerr.setjmp_buffer, 1); // <vho> - cancel decoding
224
225 (void) jpeg_read_scanlines(&cinfo, buffer, 1);
226 // info.nProgress = (long)(100*cinfo.output_scanline/cinfo.output_height);
227 //<DP> Step 6a: CMYK->RGB */
228 if ((cinfo.num_components==4)&&(cinfo.quantize_colors==FALSE)){
229 BYTE k,*dst,*src;
230 dst=iter.GetRow();
231 src=buffer[0];
232 for(long x3=0,x4=0; x3<(long)info.dwEffWidth && x4<row_stride; x3+=3, x4+=4){
233 k=src[x4+3];
234 dst[x3] =(BYTE)((k * src[x4+2])/255);
235 dst[x3+1]=(BYTE)((k * src[x4+1])/255);
236 dst[x3+2]=(BYTE)((k * src[x4+0])/255);
237 }
238 } else {
239 /* Assume put_scanline_someplace wants a pointer and sample count. */
240 iter.SetRow(buffer[0], row_stride);
241 }
242 iter.PrevRow();
243 }
244
245 /* Step 7: Finish decompression */
246 (void) jpeg_finish_decompress(&cinfo);
247 /* We can ignore the return value since suspension is not possible
248 * with the stdio data source.
249 */
250
251 //<DP> Step 7A: Swap red and blue components
252 // not necessary if swapped red and blue definition in jmorecfg.h;ln322 <W. Morrison>
253 if ((cinfo.num_components==3)&&(cinfo.quantize_colors==FALSE)){
254 BYTE* r0=GetBits();
255 for(long y=0;y<head.biHeight;y++){
256 if (info.nEscape) longjmp(jerr.setjmp_buffer, 1); // <vho> - cancel decoding
257 RGBtoBGR(r0,3*head.biWidth);
258 r0+=info.dwEffWidth;
259 }
260 }
261
262 /* Step 8: Release JPEG decompression object */
263 /* This is an important step since it will release a good deal of memory. */
264 jpeg_destroy_decompress(&cinfo);
265
266 /* At this point you may want to check to see whether any corrupt-data
267 * warnings occurred (test whether jerr.pub.num_warnings is nonzero).
268 */
269
270 /* And we're done! */
271 return true;
272}
273////////////////////////////////////////////////////////////////////////////////
274#endif //CXIMAGE_SUPPORT_DECODE
275////////////////////////////////////////////////////////////////////////////////
276#if CXIMAGE_SUPPORT_ENCODE
277////////////////////////////////////////////////////////////////////////////////
278bool CxImageJPG::Encode(CxFile * hFile)
279{
280 if (EncodeSafeCheck(hFile)) return false;
281
282 if (head.biClrUsed!=0 && !IsGrayScale()){
283 strcpy(info.szLastError,"JPEG can save only RGB or GreyScale images");
284 return false;
285 }
286
287 // necessary for EXIF, and for roll backs
288 long pos=hFile->Tell();
289
290 /* This struct contains the JPEG compression parameters and pointers to
291 * working space (which is allocated as needed by the JPEG library).
292 * It is possible to have several such structures, representing multiple
293 * compression/decompression processes, in existence at once. We refer
294 * to any one struct (and its associated working data) as a "JPEG object".
295 */
296 struct jpeg_compress_struct cinfo;
297 /* This struct represents a JPEG error handler. It is declared separately
298 * because applications often want to supply a specialized error handler
299 * (see the second half of this file for an example). But here we just
300 * take the easy way out and use the standard error handler, which will
301 * print a message on stderr and call exit() if compression fails.
302 * Note that this struct must live as long as the main JPEG parameter
303 * struct, to avoid dangling-pointer problems.
304 */
305 //struct jpeg_error_mgr jerr;
306 /* We use our private extension JPEG error handler. <CSC> */
307 struct jpg_error_mgr jerr;
308 jerr.buffer=info.szLastError;
309 /* More stuff */
310 int row_stride; /* physical row width in image buffer */
311 JSAMPARRAY buffer; /* Output row buffer */
312
313 /* Step 1: allocate and initialize JPEG compression object */
314 /* We have to set up the error handler first, in case the initialization
315 * step fails. (Unlikely, but it could happen if you are out of memory.)
316 * This routine fills in the contents of struct jerr, and returns jerr's
317 * address which we place into the link field in cinfo.
318 */
319 //cinfo.err = jpeg_std_error(&jerr); <CSC>
320 /* We set up the normal JPEG error routines, then override error_exit. */
321 cinfo.err = jpeg_std_error(&jerr.pub);
322 jerr.pub.error_exit = ima_jpeg_error_exit;
323
324 /* Establish the setjmp return context for my_error_exit to use. */
325 if (setjmp(jerr.setjmp_buffer)) {
326 /* If we get here, the JPEG code has signaled an error.
327 * We need to clean up the JPEG object, close the input file, and return.
328 */
329 strcpy(info.szLastError, jerr.buffer); //<CSC>
330 jpeg_destroy_compress(&cinfo);
331 return 0;
332 }
333
334 /* Now we can initialize the JPEG compression object. */
335 jpeg_create_compress(&cinfo);
336 /* Step 2: specify data destination (eg, a file) */
337 /* Note: steps 2 and 3 can be done in either order. */
338 /* Here we use the library-supplied code to send compressed data to a
339 * stdio stream. You can also write your own code to do something else.
340 * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
341 * requires it in order to write binary files.
342 */
343
344 //jpeg_stdio_dest(&cinfo, outfile);
345 CxFileJpg dest(hFile);
346 cinfo.dest = &dest;
347
348 /* Step 3: set parameters for compression */
349 /* First we supply a description of the input image.
350 * Four fields of the cinfo struct must be filled in:
351 */
352 cinfo.image_width = GetWidth(); // image width and height, in pixels
353 cinfo.image_height = GetHeight();
354
355 if (IsGrayScale()){
356 cinfo.input_components = 1; // # of color components per pixel
357 cinfo.in_color_space = JCS_GRAYSCALE; /* colorspace of input image */
358 } else {
359 cinfo.input_components = 3; // # of color components per pixel
360 cinfo.in_color_space = JCS_RGB; /* colorspace of input image */
361 }
362
363 /* Now use the library's routine to set default compression parameters.
364 * (You must set at least cinfo.in_color_space before calling this,
365 * since the defaults depend on the source color space.)
366 */
367 jpeg_set_defaults(&cinfo);
368 /* Now you can set any non-default parameters you wish to.
369 * Here we just illustrate the use of quality (quantization table) scaling:
370 */
371
372//#ifdef C_ARITH_CODING_SUPPORTED
373 if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_ARITHMETIC) != 0)
374 cinfo.arith_code = TRUE;
375//#endif
376
377//#ifdef ENTROPY_OPT_SUPPORTED
378 if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_OPTIMIZE) != 0)
379 cinfo.optimize_coding = TRUE;
380//#endif
381
382 if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_GRAYSCALE) != 0)
383 jpeg_set_colorspace(&cinfo, JCS_GRAYSCALE);
384
385 if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_SMOOTHING) != 0)
386 cinfo.smoothing_factor = m_nSmoothing;
387
388 jpeg_set_quality(&cinfo, GetJpegQuality(), (GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_BASELINE) != 0);
389
390//#ifdef C_PROGRESSIVE_SUPPORTED
391 if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_PROGRESSIVE) != 0)
392 jpeg_simple_progression(&cinfo);
393//#endif
394
395#ifdef C_LOSSLESS_SUPPORTED
396 if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_LOSSLESS) != 0)
397 jpeg_simple_lossless(&cinfo, m_nPredictor, m_nPointTransform);
398#endif
399
400 //SetCodecOption(ENCODE_SUBSAMPLE_444 | GetCodecOption(CXIMAGE_FORMAT_JPG),CXIMAGE_FORMAT_JPG);
401
402 // 2x2, 1x1, 1x1 (4:1:1) : High (default sub sampling)
403 cinfo.comp_info[0].h_samp_factor = 2;
404 cinfo.comp_info[0].v_samp_factor = 2;
405 cinfo.comp_info[1].h_samp_factor = 1;
406 cinfo.comp_info[1].v_samp_factor = 1;
407 cinfo.comp_info[2].h_samp_factor = 1;
408 cinfo.comp_info[2].v_samp_factor = 1;
409
410 if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_SUBSAMPLE_422) != 0){
411 // 2x1, 1x1, 1x1 (4:2:2) : Medium
412 cinfo.comp_info[0].h_samp_factor = 2;
413 cinfo.comp_info[0].v_samp_factor = 1;
414 cinfo.comp_info[1].h_samp_factor = 1;
415 cinfo.comp_info[1].v_samp_factor = 1;
416 cinfo.comp_info[2].h_samp_factor = 1;
417 cinfo.comp_info[2].v_samp_factor = 1;
418 }
419
420 if ((GetCodecOption(CXIMAGE_FORMAT_JPG) & ENCODE_SUBSAMPLE_444) != 0){
421 // 1x1 1x1 1x1 (4:4:4) : None
422 cinfo.comp_info[0].h_samp_factor = 1;
423 cinfo.comp_info[0].v_samp_factor = 1;
424 cinfo.comp_info[1].h_samp_factor = 1;
425 cinfo.comp_info[1].v_samp_factor = 1;
426 cinfo.comp_info[2].h_samp_factor = 1;
427 cinfo.comp_info[2].v_samp_factor = 1;
428 }
429
430 cinfo.density_unit=1;
431 cinfo.X_density=(unsigned short)GetXDPI();
432 cinfo.Y_density=(unsigned short)GetYDPI();
433
434 /* Step 4: Start compressor */
435 /* TRUE ensures that we will write a complete interchange-JPEG file.
436 * Pass TRUE unless you are very sure of what you're doing.
437 */
438 jpeg_start_compress(&cinfo, TRUE);
439
440 /* Step 5: while (scan lines remain to be written) */
441 /* jpeg_write_scanlines(...); */
442 /* Here we use the library's state variable cinfo.next_scanline as the
443 * loop counter, so that we don't have to keep track ourselves.
444 * To keep things simple, we pass one scanline per call; you can pass
445 * more if you wish, though.
446 */
447 row_stride = info.dwEffWidth; /* JSAMPLEs per row in image_buffer */
448
449 //<DP> "8+row_stride" fix heap deallocation problem during debug???
450 buffer = (*cinfo.mem->alloc_sarray)
451 ((j_common_ptr) &cinfo, JPOOL_IMAGE, 8+row_stride, 1);
452
453 CImageIterator iter(this);
454
455 iter.Upset();
456 while (cinfo.next_scanline < cinfo.image_height) {
457 // info.nProgress = (long)(100*cinfo.next_scanline/cinfo.image_height);
458 iter.GetRow(buffer[0], row_stride);
459 // not necessary if swapped red and blue definition in jmorecfg.h;ln322 <W. Morrison>
460 if (head.biClrUsed==0){ // swap R & B for RGB images
461 RGBtoBGR(buffer[0], row_stride); // Lance : 1998/09/01 : Bug ID: EXP-2.1.1-9
462 }
463 iter.PrevRow();
464 (void) jpeg_write_scanlines(&cinfo, buffer, 1);
465 }
466
467 /* Step 6: Finish compression */
468 jpeg_finish_compress(&cinfo);
469
470 /* Step 7: release JPEG compression object */
471 /* This is an important step since it will release a good deal of memory. */
472 jpeg_destroy_compress(&cinfo);
473
474
475#if CXIMAGEJPG_SUPPORT_EXIF
476 if (m_exif && m_exif->m_exifinfo->IsExif){
477 // discard useless sections (if any) read from original image
478 m_exif->DiscardAllButExif();
479 // read new created image, to split the sections
480 hFile->Seek(pos,SEEK_SET);
481 m_exif->DecodeExif(hFile,EXIF_READ_IMAGE);
482 // save back the image, adding EXIF section
483 hFile->Seek(pos,SEEK_SET);
484 m_exif->EncodeExif(hFile);
485 }
486#endif
487
488
489 /* And we're done! */
490 return true;
491}
492////////////////////////////////////////////////////////////////////////////////
493#endif // CXIMAGE_SUPPORT_ENCODE
494////////////////////////////////////////////////////////////////////////////////
495#endif // CXIMAGE_SUPPORT_JPG
496
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