gdcmJpeg12.cxx

// gdcmJpeg12.cxx
//-----------------------------------------------------------------------------
#include <stdio.h>
#include "gdcmFile.h"

#define BITS_IN_JSAMPLE 12

// BITS_IN_JSAMPLE is a compile time defined options.
// We need both 8 an 12;
// To avoid renaming *all* the Jpeg functions,
// we hard code the 'brain damaged liker' option.
// For all the functions, we shall have the 8 and 12 version
// (8 with the 'long' name, 12 with the 'short' name)

#define jpeg_read_header        jReadHeader
#define my_error_exit           myErrorExit
#define jpeg_destroy_decompress jDestDecompress
#define jpeg_stdio_src          jStdSrc
#define jpeg_read_header        jReadHeader
#define jpeg_read_scanlines     jReadScanlines
#define jpeg_finish_decompress  jFinDecompress
#define jpeg_create_decompress  jCreaDecompress

// -----------------
#define jpeg_std_error          jStdError
#define jpeg_CreateCompress     jCreaCompress
#define jpeg_CreateDecompress   jCreaDecompress
#define jpeg_destroy_compress   jDestCompress
#define jpeg_destroy_decompress jDestDecompress
#define jpeg_stdio_dest         jStdDest
#define jpeg_stdio_src          jStdSrc
#define jpeg_set_defaults       jSetDefaults
#define jpeg_set_colorspace     jSetColorspace
#define jpeg_default_colorspace jDefColorspace
#define jpeg_set_quality        jSetQuality
#define jpeg_set_linear_quality jSetLQuality
#define jpeg_add_quant_table    jAddQuantTable
#define jpeg_quality_scaling    jQualityScaling
#define jpeg_simple_progression jSimProgress
#define jpeg_suppress_tables    jSuppressTables
#define jpeg_alloc_quant_table  jAlcQTable
#define jpeg_alloc_huff_table   jAlcHTable
#define jpeg_start_compress     jStrtCompress
#define jpeg_write_scanlines    jWrtScanlines
#define jpeg_finish_compress    jFinCompress
#define jpeg_write_raw_data     jWrtRawData
#define jpeg_write_marker       jWrtMarker
#define jpeg_write_m_header     jWrtMHeader
#define jpeg_write_m_byte       jWrtMByte
#define jpeg_write_tables       jWrtTables
#define jpeg_read_header        jReadHeader
#define jpeg_start_decompress   jStrtDecompress
#define jpeg_read_scanlines     jReadScanlines
#define jpeg_finish_decompress  jFinDecompress
#define jpeg_read_raw_data      jReadRawData
#define jpeg_has_multiple_scans jHasMultScn
#define jpeg_start_output       jStrtOutput
#define jpeg_finish_output      jFinOutput
#define jpeg_input_complete     jInComplete
#define jpeg_new_colormap       jNewCMap
#define jpeg_consume_input      jConsumeInput
#define jpeg_calc_output_dimensions     jCalcDimensions
#define jpeg_save_markers       jSaveMarkers
#define jpeg_set_marker_processor       jSetMarker
#define jpeg_read_coefficients  jReadCoefs
#define jpeg_write_coefficients jWrtCoefs
#define jpeg_copy_critical_parameters   jCopyCrit
#define jpeg_abort_compress     jAbrtCompress
#define jpeg_abort_decompress   jAbrtDecompress
#define jpeg_abort              jAbort
#define jpeg_destroy            jDestroy
#define jpeg_resync_to_restart  jResyncRestart

#define DEBUG 0

/*
 * <setjmp.h> is used for the optional error recovery mechanism shown in
 * the second part of the example.
 */

/*
 * Include file for users of JPEG library.
 * You will need to have included system headers that define at least
 * the typedefs FILE and size_t before you can include jpeglib.h.
 * (stdio.h is sufficient on ANSI-conforming systems.)
 * You may also wish to include "jerror.h".
 */

extern "C" {
#include "jpeg/libijg12/jpeglib12.h"
#include <setjmp.h>
}

/******************** JPEG DECOMPRESSION SAMPLE INTERFACE *******************/

/* This half of the example shows how to read data from the JPEG decompressor.
 * It's a bit more refined than the above, in that we show:
 *   (a) how to modify the JPEG library's standard error-reporting behavior;
 *   (b) how to allocate workspace using the library's memory manager.
 *
 * Just to make this example a little different from the first one, we'll
 * assume that we do not intend to put the whole image into an in-memory
 * buffer, but to send it line-by-line someplace else.  We need a one-
 * scanline-high JSAMPLE array as a work buffer, and we will let the JPEG
 * memory manager allocate it for us.  This approach is actually quite useful
 * because we don't need to remember to deallocate the buffer separately: it
 * will go away automatically when the JPEG object is cleaned up.
 */

/*
 * ERROR HANDLING:
 *
 * The JPEG library's standard error handler (jerror.c) is divided into
 * several "methods" which you can override individually.  This lets you
 * adjust the behavior without duplicating a lot of code, which you might
 * have to update with each future release.
 *
 * Our example here shows how to override the "error_exit" method so that
 * control is returned to the library's caller when a fatal error occurs,
 * rather than calling exit() as the standard error_exit method does.
 *
 * We use C's setjmp/longjmp facility to return control.  This means that the
 * routine which calls the JPEG library must first execute a setjmp() call to
 * establish the return point.  We want the replacement error_exit to do a
 * longjmp().  But we need to make the setjmp buffer accessible to the
 * error_exit routine.  To do this, we make a private extension of the
 * standard JPEG error handler object.  (If we were using C++, we'd say we
 * were making a subclass of the regular error handler.)
 *
 * Here's the extended error handler struct:
 */

//-----------------------------------------------------------------------------
struct my_error_mgr {
  struct jpeg_error_mgr pub;    /* "public" fields */
  jmp_buf setjmp_buffer;        /* for return to caller */
};

typedef struct my_error_mgr * my_error_ptr;

//-----------------------------------------------------------------------------
/*
 * Here's the routine that will replace the standard error_exit method:
 */
METHODDEF(void)
my_error_exit (j_common_ptr cinfo) {
  /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
  my_error_ptr myerr = (my_error_ptr) cinfo->err;

  /* Always display the message. */
  /* We could postpone this until after returning, if we chose. */
  (*cinfo->err->output_message) (cinfo);

  /* Return control to the setjmp point */
  longjmp(myerr->setjmp_buffer, 1);
}


//-----------------------------------------------------------------------------
/*
 * Sample routine for JPEG decompression.  We assume that the source file name
 * is passed in.  We want to return 1 on success, 0 on error.
 */
bool gdcmFile::gdcm_read_JPEG_file12 (FILE *fp,void * image_buffer) {
   char *pimage;

   /* This struct contains the JPEG decompression parameters and pointers to
    * working space (which is allocated as needed by the JPEG library).
    */

   struct jpeg_decompress_struct cinfo;
  
   /* -------------- inside, we found :
    * JDIMENSION image_width;   // input image width 
    * JDIMENSION image_height;  // input image height 
    * int input_components;             // nb of color components in input image 
    * J_COLOR_SPACE in_color_space;     // colorspace of input image 
    * double input_gamma;               // image gamma of input image 
    * -------------- */
  
   /* We use our private extension JPEG error handler.
    * Note that this struct must live as long as the main JPEG parameter
    * struct, to avoid dangling-pointer problems.
    */
   struct my_error_mgr jerr;
   /* More stuff */

   JSAMPARRAY buffer;           /* Output row buffer */

   // rappel :
   // ------
   // typedef unsigned char JSAMPLE;
   // typedef JSAMPLE FAR *JSAMPROW;    /* ptr to one image row of pixel samples. */
   // typedef JSAMPROW *JSAMPARRAY;     /* ptr to some rows (a 2-D sample array) */
   // typedef JSAMPARRAY *JSAMPIMAGE;   /* a 3-D sample array: top index is color */


   int row_stride;              /* physical row width in output buffer */
  
   if (DEBUG) printf("entree dans gdcmFile::gdcm_read_JPEG_file12, depuis gdcmJpeg\n");


   /* In this example we want to open the input file before doing anything else,
    * so that the setjmp() error recovery below can assume the file is open.
    * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
    * requires it in order to read binary files.
    */

   /* Step 1: allocate and initialize JPEG decompression object */
   if (DEBUG)printf("Entree Step 1\n");

   /* We set up the normal JPEG error routines, then override error_exit. */

   cinfo.err = jpeg_std_error(&jerr.pub);
   jerr.pub.error_exit = my_error_exit;

   /* Establish the setjmp return context for my_error_exit to use. */
   if (setjmp(jerr.setjmp_buffer)) {
      /* If we get here, the JPEG code has signaled an error.
       * We need to clean up the JPEG object, close the input file, and return.
       */
      jpeg_destroy_decompress(&cinfo);
      return(false);
   }

   /* Now we can initialize the JPEG decompression object. */
   jpeg_create_decompress(&cinfo);

   /* Step 2: specify data source (eg, a file) */
   if (DEBUG) printf("Entree Step 2\n");
   jpeg_stdio_src(&cinfo, fp);

   /* Step 3: read file parameters with jpeg_read_header() */
   if (DEBUG) printf("Entree Step 3\n");
   (void) jpeg_read_header(&cinfo, TRUE);

   /* We can ignore the return value from jpeg_read_header since
    *   (a) suspension is not possible with the stdio data source, and
    *   (b) we passed TRUE to reject a tables-only JPEG file as an error.
    * See libjpeg.doc for more info.
    */

   if (DEBUG) {   
      printf("--------------Header contents :----------------\n");
      printf("image_width %d image_height %d\n", 
                              cinfo.image_width , cinfo.image_height);
      printf("bits of precision in image data  %d \n", 
                              cinfo.output_components);
      printf("nb of color components returned  %d \n", 
                              cinfo.data_precision);
   }


   /*
    * JDIMENSION image_width;   // input image width 
    * JDIMENSION image_height;  // input image height 
    * int output_components;    // # of color components returned 
    * J_COLOR_SPACE in_color_space;     // colorspace of input image 
    * double input_gamma;               // image gamma of input image
    * int data_precision;               // bits of precision in image data 
    */

   /* Step 4: set parameters for decompression */
   if (DEBUG) printf("Entree Step 4\n");

   /* In this example, we don't need to change any of the defaults set by
    * jpeg_read_header(), so we do nothing here.
    */

   /* Step 5: Start decompressor */
   if (DEBUG) printf("Entree Step 5\n");

   (void) jpeg_start_decompress(&cinfo);
   /* We can ignore the return value since suspension is not possible
    * with the stdio data source.
    */

   /* We may need to do some setup of our own at this point before reading
    * the data.  After jpeg_start_decompress() we have the correct scaled
    * output image dimensions available, as well as the output colormap
    * if we asked for color quantization.
    * In this example, we need to make an output work buffer of the right size.
    */ 

   /* JSAMPLEs per row in output buffer */
   row_stride = cinfo.output_width * cinfo.output_components;
  
   if (DEBUG) 
      printf ("cinfo.output_width %d cinfo.output_components %d  row_stride %d\n",
              cinfo.output_width, cinfo.output_components,row_stride);
        
   /* Make a one-row-high sample array that will go away when done with image */
   buffer = (*cinfo.mem->alloc_sarray)
           ((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);

   /* Step 6: while (scan lines remain to be read) */
   if (DEBUG)  printf("Entree Step 6\n"); 

   /*           jpeg_read_scanlines(...); */

   /* Here we use the library's state variable cinfo.output_scanline as the
    * loop counter, so that we don't have to keep track ourselves.
    */

   if (DEBUG)  printf ("cinfo.output_height %d  cinfo.output_width %d\n",
                   cinfo.output_height,cinfo.output_width);

   pimage=(char *)image_buffer;

   while (cinfo.output_scanline < cinfo.output_height) {
      /* jpeg_read_scanlines expects an array of pointers to scanlines.
       * Here the array is only one element long, but you could ask for
       * more than one scanline at a time if that's more convenient.
       */

      (void) jpeg_read_scanlines(&cinfo, buffer, 1);

      if ( BITS_IN_JSAMPLE == 8) {
         memcpy( pimage, buffer[0],row_stride); 
         pimage+=row_stride;
      } else {
         memcpy( pimage, buffer[0],row_stride*2 ); // FIXME : *2  car 16 bits?!?
         pimage+=row_stride*2;                     // FIXME : *2 car 16 bits?!?     
      }
   }
 
  /* Step 7: Finish decompression */
   if (DEBUG)  printf("Entree Step 7\n");
  (void) jpeg_finish_decompress(&cinfo);
   /* We can ignore the return value since suspension is not possible
    * with the stdio data source.
    */

   /* Step 8: Release JPEG decompression object */
   if (DEBUG) printf("Entree Step 8\n");

   /* This is an important step since it will release a good deal of memory. */
   jpeg_destroy_decompress(&cinfo);

   /* After finish_decompress, we can close the input file.
    * Here we postpone it until after no more JPEG errors are possible,
    * so as to simplify the setjmp error logic above.  (Actually, I don't
    * think that jpeg_destroy can do an error exit, but why assume anything...)
    */

   /* At this point you may want to check to see whether any corrupt-data
    * warnings occurred (test whether jerr.pub.num_warnings is nonzero).
    */

   /* And we're done! */

   return(true);
}

/*
 * SOME FINE POINTS:
 *
 * In the above code, we ignored the return value of jpeg_read_scanlines,
 * which is the number of scanlines actually read.  We could get away with
 * this because we asked for only one line at a time and we weren't using
 * a suspending data source.  See libjpeg.doc for more info.
 *
 * We cheated a bit by calling alloc_sarray() after jpeg_start_decompress();
 * we should have done it beforehand to ensure that the space would be
 * counted against the JPEG max_memory setting.  In some systems the above
 * code would risk an out-of-memory error.  However, in general we don't
 * know the output image dimensions before jpeg_start_decompress(), unless we
 * call jpeg_calc_output_dimensions().  See libjpeg.doc for more about this.
 *
 * Scanlines are returned in the same order as they appear in the JPEG file,
 * which is standardly top-to-bottom.  If you must emit data bottom-to-top,
 * you can use one of the virtual arrays provided by the JPEG memory manager
 * to invert the data.  See wrbmp.c for an example.
 *
 * As with compression, some operating modes may require temporary files.
 * On some systems you may need to set up a signal handler to ensure that
 * temporary files are deleted if the program is interrupted.  See libjpeg.doc.
 */

//-----------------------------------------------------------------------------

---