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Diffstat (limited to 'hl/examples/ex_image2.c')
| -rw-r--r-- | hl/examples/ex_image2.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/hl/examples/ex_image2.c b/hl/examples/ex_image2.c new file mode 100644 index 0000000..6740b06 --- /dev/null +++ b/hl/examples/ex_image2.c @@ -0,0 +1,169 @@ +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * Copyright by the Board of Trustees of the University of Illinois. * + * All rights reserved. * + * * + * This file is part of HDF5. The full HDF5 copyright notice, including * + * terms governing use, modification, and redistribution, is contained in * + * the files COPYING and Copyright.html. COPYING can be found at the root * + * of the source code distribution tree; Copyright.html can be found at the * + * root level of an installed copy of the electronic HDF5 document set and * + * is linked from the top-level documents page. It can also be found at * + * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have * + * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. * + * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ + +#include "H5IM.h" +#include <stdlib.h> +#include <string.h> + +#define DATA_FILE1 "image8.txt" +#define DATA_FILE2 "image24pixel.txt" +#define IMAGE1_NAME "image8bit" +#define IMAGE2_NAME "image24bitpixel" +#define PAL_NAME "palette" +#define PAL_ENTRIES 256 + +static int read_data(const char* file_name, hsize_t *width, hsize_t *height ); +unsigned char *gbuf = 0; /* global buffer for image data */ + +int main( void ) +{ + hid_t file_id; /* HDF5 file identifier */ + hsize_t width; /* width of image */ + hsize_t height; /* height of image */ + unsigned char pal[ PAL_ENTRIES * 3 ]; /* palette array */ + hsize_t pal_dims[2] = {PAL_ENTRIES,3}; /* palette dimensions */ + herr_t status, i, n; + + /* create a new HDF5 file using default properties. */ + file_id = H5Fcreate( "ex_image2.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT ); + + /* read first data file */ + if (read_data(DATA_FILE1,&width,&height)<0) + goto out; + + /* make the image */ + status=H5IMmake_image_8bit( file_id, IMAGE1_NAME, width, height, gbuf ); + +/*------------------------------------------------------------------------- + * define a palette, blue to red tones + *------------------------------------------------------------------------- + */ + for ( i=0, n=0; i<PAL_ENTRIES*3; i+=3, n++) + { + pal[i] =n; /* red */ + pal[i+1]=0; /* green */ + pal[i+2]=255-n; /* blue */ + } + + /* make a palette */ + status=H5IMmake_palette( file_id, PAL_NAME, pal_dims, pal ); + + /* attach the palette to the image */ + status=H5IMlink_palette( file_id, IMAGE1_NAME, PAL_NAME ); + +/*------------------------------------------------------------------------- + * True color image example with pixel interlace + *------------------------------------------------------------------------- + */ + + /* read second data file */ + if (read_data(DATA_FILE2,&width,&height)<0) + goto out; + + /* make dataset */ + status=H5IMmake_image_24bit( file_id, IMAGE2_NAME, width, height, "INTERLACE_PIXEL", gbuf ); + + /* close the file. */ + H5Fclose( file_id ); + + return 0; + +out: + printf("Error on return function...Exiting\n"); + return 1; +} + + +/*------------------------------------------------------------------------- + * read_data + * utility function to read ASCII image data + * the files have a header of the type + * + * components + * n + * height + * n + * width + * n + * + * followed by the image data + * + *------------------------------------------------------------------------- + */ + +static int read_data( const char* fname, /*IN*/ + hsize_t *width, /*OUT*/ + hsize_t *height /*OUT*/ ) +{ + int i, n; + int color_planes; + char str[20]; + FILE *f; + int w, h; + char *srcdir = getenv("srcdir"); /* the source directory */ + char data_file[512]=""; /* buffer to hold name of existing data file */ + +/*------------------------------------------------------------------------- + * compose the name of the file to open, using "srcdir", if appropriate + *------------------------------------------------------------------------- + */ + strcpy(data_file, ""); + if (srcdir) + { + strcpy(data_file, srcdir); + strcat(data_file, "/"); + } + strcat(data_file,fname); + +/*------------------------------------------------------------------------- + * read + *------------------------------------------------------------------------- + */ + + f = fopen(data_file, "r"); + if ( f == NULL ) + { + printf( "Could not open file %s. Try set $srcdir \n", data_file ); + return -1; + } + + fscanf( f, "%s", str ); + fscanf( f, "%d", &color_planes ); + fscanf( f, "%s", str ); + fscanf( f, "%d", &h); + fscanf( f, "%s", str ); + fscanf( f, "%d", &w); + + *width = (hsize_t)w; + *height = (hsize_t)h; + + if ( gbuf ) + { + free( gbuf ); + gbuf=NULL; + } + + gbuf = (unsigned char*) malloc (w * h * color_planes * sizeof( unsigned char )); + + for (i = 0; i < h * w * color_planes ; i++) + { + fscanf( f, "%d",&n ); + gbuf[i] = (unsigned char)n; + } + fclose(f); + + return 1; + +} + |