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-rw-r--r--tools/h52jpeg/h52jpeg.c192
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! */
+}
+