[svn-r15225] added a function that calls the jpeg library and writes a jgeg file for each HDF5 image

tested: windows, linux

1 files changed, 180 insertions, 12 deletions

diff --git a/tools/h52jpeg/h52jpeg.c b/tools/h52jpeg/h52jpeg.c
index 56a7498..eccf8f7 100644
--- a/tools/h52jpeg/h52jpeg.c
+++ b/tools/h52jpeg/h52jpeg.c
@@ -13,15 +13,21 @@
  * access to either file, you may request a copy from help@hdfgroup.org.     *
  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
+/* From jpeg documentation 
+ *
+ * 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".
+ */
+
+#include <stdio.h>
 #include <stdlib.h>
 #include <memory.h>
 
-
-
-#if 0
 #include "jpeglib.h"
 #include "jerror.h"
-#endif
 
 #include "H5private.h"
 #include "h5tools.h"
@@ -30,7 +36,6 @@
 #include "H5IMpublic.h"
 
 
-
 const char *progname = "h52jpeg";
 int d_status = EXIT_SUCCESS;
 
@@ -54,14 +59,13 @@ typedef struct
  const char  *image_name;
  int         image_type;
  int         verbose;
-
-
 } h52jpeg_opt_t;
 
 
 /* prototypes */
 static void usage(const char *prog);
 static int h52jpeg(h52jpeg_opt_t options);
+static void write_JPEG_file(char *filename, JSAMPLE *image_buffer, int image_height, int image_width, int planes);               
 
 
 /*-------------------------------------------------------------------------
@@ -75,7 +79,7 @@ static int h52jpeg(h52jpeg_opt_t options);
  *
  *-------------------------------------------------------------------------
  */
-int main(int argc, char **argv)
+int main(int argc, const char *argv[])
 {
     h52jpeg_opt_t options;
     const char    *image_type = NULL;
@@ -151,11 +155,11 @@ static void usage(const char *prog)
     printf("   -v, --verbose           Verbose mode, print object information\n");
     printf("   -V, --version           Print version number and exit\n");
     printf("   -i, --image             Image name (full path in HDF5 file)\n");
-    printf("   -t T, --type=T          Type of image (8bit or 24bit)\n");
+    printf("   -t T, --type=T          Type of image (graycolor or truecolor)\n");
     
     printf("\n");
     
-    printf("  T - is a string, either <8bit> or <24bit>\n");
+    printf("  T - is a string, either <gray> or <true>\n");
     
 }
 
@@ -196,6 +200,8 @@ static int h52jpeg(h52jpeg_opt_t opt)
     int            j;
     int            done;
     char           jpeg_name[1024];
+    int            len;
+
 
     /* open the HDF5 file */
     if (( fid = h5tools_fopen(opt.file_name, H5F_ACC_RDONLY, H5P_DEFAULT, NULL, NULL, (size_t)0)) < 0) 
@@ -230,9 +236,23 @@ static int h52jpeg(h52jpeg_opt_t opt)
         case H5TRAV_TYPE_DATASET:
 
             name = travt->objs[i].name;
-            strcpy( jpeg_name, opt.template_name );
-            strcat( jpeg_name, name );
 
+            HDstrcpy( jpeg_name, opt.template_name );
+            HDstrcat( jpeg_name, name );
+            HDstrcat( jpeg_name, ".jpeg" );
+            len = HDstrlen( jpeg_name);
+
+            /* HDF5 path names might contain '/', replace with '_' */
+            for (j = 0; j < len; j++)
+            {
+                if (jpeg_name[j] == '/')
+                {  
+                    jpeg_name[j] = '_'; 
+                }
+            }
+
+
+        
             done = 0;
 
             if ( opt.verbose)
@@ -255,8 +275,17 @@ static int h52jpeg(h52jpeg_opt_t opt)
                 if ( H5IMread_image( fid, name, buf ) < 0 )
                     goto out;
                 
+                write_JPEG_file (jpeg_name, 
+                     buf,	               
+                    (int) height,	       
+                    (int) width,           
+                    (int) planes);         
+                
+                
                 free( buf );
                 buf = NULL;
+
+                done = 1;
                 
                 
                 
@@ -375,3 +404,142 @@ out:
 }
 
 
+
+
+/*
+ * Sample routine for JPEG compression.  We assume that the target file name
+ * and a compression quality factor are passed in.
+ *
+ * IMAGE DATA FORMATS:
+ *
+ * The standard input image format is a rectangular array of pixels, with
+ * each pixel having the same number of "component" values (color channels).
+ * Each pixel row is an array of JSAMPLEs (which typically are unsigned chars).
+ * If you are working with color data, then the color values for each pixel
+ * must be adjacent in the row; for example, R,G,B,R,G,B,R,G,B,... for 24-bit
+ * RGB color.
+ *
+ * For this example, we'll assume that this data structure matches the way
+ * our application has stored the image in memory, so we can just pass a
+ * pointer to our image buffer.  In particular, let's say that the image is
+ * RGB color and is described by:
+ */
+
+static 
+void write_JPEG_file(char *filename, 
+                     JSAMPLE *image_buffer, /* Points to large array of R,G,B-order data */
+                     int image_height,      /* Number of rows in image */
+                     int image_width,       /* Number of columns in image */
+                     int planes)            /* # of color components per pixel */           
+{
+    /* This struct contains the JPEG compression parameters and pointers to
+    * working space (which is allocated as needed by the JPEG library).
+    * It is possible to have several such structures, representing multiple
+    * compression/decompression processes, in existence at once.  We refer
+    * to any one struct (and its associated working data) as a "JPEG object".
+    */
+    struct jpeg_compress_struct cinfo;
+    /* This struct represents a JPEG error handler.  It is declared separately
+    * because applications often want to supply a specialized error handler
+    * (see the second half of this file for an example).  But here we just
+    * take the easy way out and use the standard error handler, which will
+    * print a message on stderr and call exit() if compression fails.
+    * Note that this struct must live as long as the main JPEG parameter
+    * struct, to avoid dangling-pointer problems.
+    */
+    struct jpeg_error_mgr jerr;
+    /* More stuff */
+    FILE * outfile;		/* target file */
+    JSAMPROW row_pointer[1];	/* pointer to JSAMPLE row[s] */
+    int row_stride;		/* physical row width in image buffer */
+    
+    /* Step 1: allocate and initialize JPEG compression object */
+    
+    /* We have to set up the error handler first, in case the initialization
+    * step fails.  (Unlikely, but it could happen if you are out of memory.)
+    * This routine fills in the contents of struct jerr, and returns jerr's
+    * address which we place into the link field in cinfo.
+    */
+    cinfo.err = jpeg_std_error(&jerr);
+    /* Now we can initialize the JPEG compression object. */
+    jpeg_create_compress(&cinfo);
+    
+    /* Step 2: specify data destination (eg, a file) */
+    /* Note: steps 2 and 3 can be done in either order. */
+    
+    /* Here we use the library-supplied code to send compressed data to a
+    * stdio stream.  You can also write your own code to do something else.
+    * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
+    * requires it in order to write binary files.
+    */
+    if ((outfile = fopen(filename, "wb")) == NULL) {
+        fprintf(stderr, "can't open %s\n", filename);
+        exit(1);
+    }
+    jpeg_stdio_dest(&cinfo, outfile);
+    
+    /* Step 3: set parameters for compression */
+    
+    /* First we supply a description of the input image.
+    * Four fields of the cinfo struct must be filled in:
+    */
+    cinfo.image_width = image_width; 	/* image width and height, in pixels */
+    cinfo.image_height = image_height;
+    cinfo.input_components = planes;		/* # of color components per pixel */
+    
+    /* colorspace of input image */
+    if (planes == 3)
+        cinfo.in_color_space = JCS_RGB; 
+    else if (planes == 1)
+        cinfo.in_color_space = JCS_GRAYSCALE; 
+    
+    /* Now use the library's routine to set default compression parameters.
+    * (You must set at least cinfo.in_color_space before calling this,
+    * since the defaults depend on the source color space.)
+    */
+    jpeg_set_defaults(&cinfo);
+    /* Now you can set any non-default parameters you wish to.
+    * Here we just illustrate the use of quality (quantization table) scaling:
+    */
+    jpeg_set_quality(&cinfo, 100, TRUE /* limit to baseline-JPEG values */);
+    
+    /* Step 4: Start compressor */
+    
+    /* TRUE ensures that we will write a complete interchange-JPEG file.
+    * Pass TRUE unless you are very sure of what you're doing.
+    */
+    jpeg_start_compress(&cinfo, TRUE);
+    
+    /* Step 5: while (scan lines remain to be written) */
+    /*           jpeg_write_scanlines(...); */
+    
+    /* Here we use the library's state variable cinfo.next_scanline as the
+    * loop counter, so that we don't have to keep track ourselves.
+    * To keep things simple, we pass one scanline per call; you can pass
+    * more if you wish, though.
+    */
+    row_stride = image_width * planes;	/* JSAMPLEs per row in image_buffer */
+    
+    while (cinfo.next_scanline < cinfo.image_height) {
+    /* jpeg_write_scanlines expects an array of pointers to scanlines.
+    * Here the array is only one element long, but you could pass
+    * more than one scanline at a time if that's more convenient.
+        */
+        row_pointer[0] = & image_buffer[cinfo.next_scanline * row_stride];
+        (void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
+    }
+    
+    /* Step 6: Finish compression */
+    
+    jpeg_finish_compress(&cinfo);
+    /* After finish_compress, we can close the output file. */
+    fclose(outfile);
+    
+    /* Step 7: release JPEG compression object */
+    
+    /* This is an important step since it will release a good deal of memory. */
+    jpeg_destroy_compress(&cinfo);
+    
+    /* And we're done! */
+}
+