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