2 //-----------------------------------------------------------------------------
6 #define BITS_IN_JSAMPLE 12
8 #define GDCM_jpr_DEBUG 0
9 // BITS_IN_JSAMPLE is a compile time defined options.
10 // We need both 8 an 12;
11 // To avoid renaming *all* the Jpeg functions,
12 // we hard code the 'brain damaged liker' option.
13 // For all the functions, we shall have the 8 and 12 version
14 // (8 with the 'long' name, 12 with the 'short' name)
16 #define jpeg_read_header jReadHeader
17 #define my_error_exit myErrorExit
18 #define jpeg_destroy_decompress jDestDecompress
19 #define jpeg_stdio_src jStdSrc
20 #define jpeg_read_header jReadHeader
21 #define jpeg_read_scanlines jReadScanlines
22 #define jpeg_finish_decompress jFinDecompress
23 //#define jpeg_create_decompress jCreaDecompress //FIXME
26 #define jpeg_std_error jStdError
27 #define jpeg_CreateCompress jCreaCompress
28 #define jpeg_CreateDecompress jCreaDecompress
29 #define jpeg_destroy_compress jDestCompress
30 #define jpeg_destroy_decompress jDestDecompress
31 #define jpeg_stdio_dest jStdDest
32 #define jpeg_stdio_src jStdSrc
33 #define jpeg_set_defaults jSetDefaults
34 #define jpeg_set_colorspace jSetColorspace
35 #define jpeg_default_colorspace jDefColorspace
36 #define jpeg_set_quality jSetQuality
37 #define jpeg_set_linear_quality jSetLQuality
38 #define jpeg_add_quant_table jAddQuantTable
39 #define jpeg_quality_scaling jQualityScaling
40 #define jpeg_simple_progression jSimProgress
41 #define jpeg_suppress_tables jSuppressTables
42 #define jpeg_alloc_quant_table jAlcQTable
43 #define jpeg_alloc_huff_table jAlcHTable
44 #define jpeg_start_compress jStrtCompress
45 #define jpeg_write_scanlines jWrtScanlines
46 #define jpeg_finish_compress jFinCompress
47 #define jpeg_write_raw_data jWrtRawData
48 #define jpeg_write_marker jWrtMarker
49 #define jpeg_write_m_header jWrtMHeader
50 #define jpeg_write_m_byte jWrtMByte
51 #define jpeg_write_tables jWrtTables
52 #define jpeg_read_header jReadHeader
53 #define jpeg_start_decompress jStrtDecompress
54 #define jpeg_read_scanlines jReadScanlines
55 #define jpeg_finish_decompress jFinDecompress
56 #define jpeg_read_raw_data jReadRawData
57 #define jpeg_has_multiple_scans jHasMultScn
58 #define jpeg_start_output jStrtOutput
59 #define jpeg_finish_output jFinOutput
60 #define jpeg_input_complete jInComplete
61 #define jpeg_new_colormap jNewCMap
62 #define jpeg_consume_input jConsumeInput
63 #define jpeg_calc_output_dimensions jCalcDimensions
64 #define jpeg_save_markers jSaveMarkers
65 #define jpeg_set_marker_processor jSetMarker
66 #define jpeg_read_coefficients jReadCoefs
67 #define jpeg_write_coefficients jWrtCoefs
68 #define jpeg_copy_critical_parameters jCopyCrit
69 #define jpeg_abort_compress jAbrtCompress
70 #define jpeg_abort_decompress jAbrtDecompress
71 #define jpeg_abort jAbort
72 #define jpeg_destroy jDestroy
73 #define jpeg_resync_to_restart jResyncRestart
76 * <setjmp.h> is used for the optional error recovery mechanism shown in
77 * the second part of the example.
81 * Include file for users of JPEG library.
82 * You will need to have included system headers that define at least
83 * the typedefs FILE and size_t before you can include jpeglib.h.
84 * (stdio.h is sufficient on ANSI-conforming systems.)
85 * You may also wish to include "jerror.h".
89 #include "jpeg/libijg12/jpeglib12.h"
93 /******************** JPEG DECOMPRESSION SAMPLE INTERFACE *******************/
95 /* This half of the example shows how to read data from the JPEG decompressor.
96 * It's a bit more refined than the above, in that we show:
97 * (a) how to modify the JPEG library's standard error-reporting behavior;
98 * (b) how to allocate workspace using the library's memory manager.
100 * Just to make this example a little different from the first one, we'll
101 * assume that we do not intend to put the whole image into an in-memory
102 * buffer, but to send it line-by-line someplace else. We need a one-
103 * scanline-high JSAMPLE array as a work buffer, and we will let the JPEG
104 * memory manager allocate it for us. This approach is actually quite useful
105 * because we don't need to remember to deallocate the buffer separately: it
106 * will go away automatically when the JPEG object is cleaned up.
112 * The JPEG library's standard error handler (jerror.c) is divided into
113 * several "methods" which you can override individually. This lets you
114 * adjust the behavior without duplicating a lot of code, which you might
115 * have to update with each future release.
117 * Our example here shows how to override the "error_exit" method so that
118 * control is returned to the library's caller when a fatal error occurs,
119 * rather than calling exit() as the standard error_exit method does.
121 * We use C's setjmp/longjmp facility to return control. This means that the
122 * routine which calls the JPEG library must first execute a setjmp() call to
123 * establish the return point. We want the replacement error_exit to do a
124 * longjmp(). But we need to make the setjmp buffer accessible to the
125 * error_exit routine. To do this, we make a private extension of the
126 * standard JPEG error handler object. (If we were using C++, we'd say we
127 * were making a subclass of the regular error handler.)
129 * Here's the extended error handler struct:
132 //-----------------------------------------------------------------------------
133 struct my_error_mgr {
134 struct jpeg_error_mgr pub; /* "public" fields */
135 jmp_buf setjmp_buffer; /* for return to caller */
138 //-----------------------------------------------------------------------------
139 typedef struct my_error_mgr * my_error_ptr;
142 * Here's the routine that will replace the standard error_exit method:
144 METHODDEF(void) my_error_exit (j_common_ptr cinfo) {
145 /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
146 my_error_ptr myerr = (my_error_ptr) cinfo->err;
148 /* Always display the message. */
149 /* We could postpone this until after returning, if we chose. */
150 (*cinfo->err->output_message) (cinfo);
152 /* Return control to the setjmp point */
153 longjmp(myerr->setjmp_buffer, 1);
157 //-----------------------------------------------------------------------------
159 * Sample routine for JPEG decompression. We assume that the source file name
160 * is passed in. We want to return 1 on success, 0 on error.
165 * \brief routine for JPEG decompression
166 * @param fp pointer to an already open file descriptor
167 * 12 significant bits per pixel
168 * @param image_buffer to receive uncompressed pixels
169 * @return 1 on success, 0 on error
172 bool gdcmFile::gdcm_read_JPEG_file12 (FILE *fp,void * image_buffer) {
175 /* This struct contains the JPEG decompression parameters and pointers to
176 * working space (which is allocated as needed by the JPEG library).
178 struct jpeg_decompress_struct cinfo;
180 /* -------------- inside, we found :
181 * JDIMENSION image_width; // input image width
182 * JDIMENSION image_height; // input image height
183 * int input_components; // nb of color components in input image
184 * J_COLOR_SPACE in_color_space; // colorspace of input image
185 * double input_gamma; // image gamma of input image
188 /* We use our private extension JPEG error handler.
189 * Note that this struct must live as long as the main JPEG parameter
190 * struct, to avoid dangling-pointer problems.
192 struct my_error_mgr jerr;
195 JSAMPARRAY buffer; /* Output row buffer */
199 // typedef unsigned char JSAMPLE;
200 // typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */
201 // typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */
202 // typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */
204 int row_stride; /* physical row width in output buffer */
205 #ifdef GDCM_jpr_DEBUG
206 printf("entree dans gdcmFile::gdcm_read_JPEG_file12, depuis gdcmJpeg\n");
207 #endif //GDCM_jpr_DEBUG
209 /* In this example we want to open the input file before doing anything else,
210 * so that the setjmp() error recovery below can assume the file is open.
211 * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
212 * requires it in order to read binary files.
215 /* Step 1: allocate and initialize JPEG decompression object */
216 #ifdef GDCM_jpr_DEBUG
217 printf("Entree Step 1\n");
218 #endif //GDCM_jpr_DEBUG
220 /* We set up the normal JPEG error routines, then override error_exit. */
222 cinfo.err = jpeg_std_error(&jerr.pub);
223 jerr.pub.error_exit = my_error_exit;
225 /* Establish the setjmp return context for my_error_exit to use. */
226 if (setjmp(jerr.setjmp_buffer)) {
227 /* If we get here, the JPEG code has signaled an error.
228 * We need to clean up the JPEG object, close the input file, and return.
230 jpeg_destroy_decompress(&cinfo);
234 /* Now we can initialize the JPEG decompression object. */
235 jpeg_create_decompress(&cinfo);
237 /* Step 2: specify data source (eg, a file) */
238 #ifdef GDCM_jpr_DEBUG
239 printf("Entree Step 2\n");
240 #endif //GDCM_jpr_DEBUG
241 jpeg_stdio_src(&cinfo, fp);
243 /* Step 3: read file parameters with jpeg_read_header() */
244 #ifdef GDCM_jpr_DEBUG
245 printf("Entree Step 3\n");
246 #endif //GDCM_jpr_DEBUG
247 (void) jpeg_read_header(&cinfo, TRUE);
249 /* We can ignore the return value from jpeg_read_header since
250 * (a) suspension is not possible with the stdio data source, and
251 * (b) we passed TRUE to reject a tables-only JPEG file as an error.
252 * See libjpeg.doc for more info.
255 #ifdef GDCM_jpr_DEBUG
256 printf("--------------Header contents :----------------\n");
257 printf("image_width %d image_height %d\n",
258 cinfo.image_width , cinfo.image_height);
259 printf("bits of precision in image data %d \n",
260 cinfo.output_components);
261 printf("nb of color components returned %d \n",
262 cinfo.data_precision);
263 #endif //GDCM_jpr_DEBUG
267 * JDIMENSION image_width; // input image width
268 * JDIMENSION image_height; // input image height
269 * int output_components; // # of color components returned
270 * J_COLOR_SPACE in_color_space; // colorspace of input image
271 * double input_gamma; // image gamma of input image
272 * int data_precision; // bits of precision in image data
275 /* Step 4: set parameters for decompression */
276 #ifdef GDCM_jpr_DEBUG
277 printf("Entree Step 4\n");
278 #endif //GDCM_jpr_DEBUG
280 /* In this example, we don't need to change any of the defaults set by
281 * jpeg_read_header(), so we do nothing here.
284 /* Step 5: Start decompressor */
285 #ifdef GDCM_jpr_DEBUG
286 printf("Entree Step 5\n");
287 #endif //GDCM_jpr_DEBUG
289 (void) jpeg_start_decompress(&cinfo);
290 /* We can ignore the return value since suspension is not possible
291 * with the stdio data source.
294 /* We may need to do some setup of our own at this point before reading
295 * the data. After jpeg_start_decompress() we have the correct scaled
296 * output image dimensions available, as well as the output colormap
297 * if we asked for color quantization.
298 * In this example, we need to make an output work buffer of the right size.
301 /* JSAMPLEs per row in output buffer */
302 row_stride = cinfo.output_width * cinfo.output_components;
304 #ifdef GDCM_jpr_DEBUG
305 printf ("cinfo.output_width %d cinfo.output_components %d row_stride %d\n",
306 cinfo.output_width, cinfo.output_components,row_stride);
307 #endif //GDCM_jpr_DEBUG
309 /* Make a one-row-high sample array that will go away when done with image */
310 buffer = (*cinfo.mem->alloc_sarray)
311 ((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
313 /* Step 6: while (scan lines remain to be read) */
314 #ifdef GDCM_jpr_DEBUG
315 printf("Entree Step 6\n");
316 #endif //GDCM_jpr_DEBUG
318 /* jpeg_read_scanlines(...); */
320 /* Here we use the library's state variable cinfo.output_scanline as the
321 * loop counter, so that we don't have to keep track ourselves.
324 #ifdef GDCM_jpr_DEBUG
325 printf ("cinfo.output_height %d cinfo.output_width %d\n",
326 cinfo.output_height,cinfo.output_width);
327 #endif //GDCM_jpr_DEBUG
329 pimage=(char *)image_buffer;
331 while (cinfo.output_scanline < cinfo.output_height) {
332 /* jpeg_read_scanlines expects an array of pointers to scanlines.
333 * Here the array is only one element long, but you could ask for
334 * more than one scanline at a time if that's more convenient.
337 (void) jpeg_read_scanlines(&cinfo, buffer, 1);
339 if ( BITS_IN_JSAMPLE == 8) {
340 memcpy( pimage, buffer[0],row_stride);
343 memcpy( pimage, buffer[0],row_stride*2 ); // FIXME : *2 car 16 bits?!?
344 pimage+=row_stride*2; // FIXME : *2 car 16 bits?!?
348 /* Step 7: Finish decompression */
349 #ifdef GDCM_jpr_DEBUG
350 printf("Entree Step 7\n");
351 #endif //GDCM_jpr_DEBUG
352 (void) jpeg_finish_decompress(&cinfo);
353 /* We can ignore the return value since suspension is not possible
354 * with the stdio data source.
357 /* Step 8: Release JPEG decompression object */
358 #ifdef GDCM_jpr_DEBUG
359 printf("Entree Step 8\n");
360 #endif //GDCM_jpr_DEBUG
362 /* This is an important step since it will release a good deal of memory. */
363 jpeg_destroy_decompress(&cinfo);
365 /* After finish_decompress, we can close the input file.
366 * Here we postpone it until after no more JPEG errors are possible,
367 * so as to simplify the setjmp error logic above. (Actually, I don't
368 * think that jpeg_destroy can do an error exit, but why assume anything...)
371 /* At this point you may want to check to see whether any corrupt-data
372 * warnings occurred (test whether jerr.pub.num_warnings is nonzero).
375 /* And we're done! */
383 * In the above code, we ignored the return value of jpeg_read_scanlines,
384 * which is the number of scanlines actually read. We could get away with
385 * this because we asked for only one line at a time and we weren't using
386 * a suspending data source. See libjpeg.doc for more info.
388 * We cheated a bit by calling alloc_sarray() after jpeg_start_decompress();
389 * we should have done it beforehand to ensure that the space would be
390 * counted against the JPEG max_memory setting. In some systems the above
391 * code would risk an out-of-memory error. However, in general we don't
392 * know the output image dimensions before jpeg_start_decompress(), unless we
393 * call jpeg_calc_output_dimensions(). See libjpeg.doc for more about this.
395 * Scanlines are returned in the same order as they appear in the JPEG file,
396 * which is standardly top-to-bottom. If you must emit data bottom-to-top,
397 * you can use one of the virtual arrays provided by the JPEG memory manager
398 * to invert the data. See wrbmp.c for an example.
400 * As with compression, some operating modes may require temporary files.
401 * On some systems you may need to set up a signal handler to ensure that
402 * temporary files are deleted if the program is interrupted. See libjpeg.doc.
405 //-----------------------------------------------------------------------------