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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF. The full HDF copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF/releases/. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include "hdf.h"
#include <stdlib.h>
#include <string.h>
/* Exception checking macro */
#define EXCHECK(a, b) \
if (a) \
goto b
/* Static variables */
uint8 red_comp[256], green_comp[256], blue_comp[256];
comp_info cinfo; /* compression structure */
static intn magnify(uint8 *from_buffer, uint8 *to_buffer, int32 from_x0, int32 from_y0, int32 from_x1,
int32 from_y1, int32 from_width, int32 from_height, int32 to_width, int32 to_height);
static intn convert8to24(uint8 *img8_buf, uint8 *img24_buf, int32 img_xdim, int32 img_ydim);
static void usage(void);
/**********************************************************************
* Function : magnify
* Purpose : Magnify an image by independent X and Y magnification
* factors. Note that the coordinates which specify
* the area in the "from" image are _inclusive_, i.e.
* if you would like to magnify the entire image, the
* "from" coordinates should be specified as:
* (0,0) and ((width-1),(height-1)), where "width"
* and "height" are the width and height of the image
* (respectively) in pixels.
* Parameters :
* from_buffer - pointer to the buffer which contains the image
* to magnify
* to_buffer - pointer to the buffer in which to place the
* magnified image
* from_x0, from_y0 - Upper Left Corner (ULC) of the rectangular
* area in the image to magnify
* from_x1, from_y1 - Lower Right Corner (LRC) of the rectangular
* area in the image to magnify
* from_width, from_height - the width and height of the image
* to magnify (or "from" image)
* to_width, to_height - the width and height of the magnified
* image (or "to" image)
* Returns : (TRUE) for success, (FALSE) for error
* Calls :
* Called by :
**********************************************************************/
static intn
magnify(uint8 *from_buffer, uint8 *to_buffer, int32 from_x0, int32 from_y0, int32 from_x1, int32 from_y1,
int32 from_width, int32 from_height, int32 to_width, int32 to_height)
{
uint8 *buf_off, /* the current offset into the magnified data */
*last_buf, /* pointer to the last useful magnified line */
*y_off, /* the y offset into the data block */
*last_y_coor, /* pointer to the last line copied */
**y_coor; /* pointers to image data */
float64 temp_val, /* temporary value for holding double results */
wind_width, /* the width of the window to magnify */
wind_height; /* the height of the window to magnify */
int32 u, v; /* local unsigned counting variables */
int32 *x_coor, /* the X coor. lookup table */
*x_coor_temp; /* temporary pointer to the x lookup table */
if (from_width == 0 || from_height == 0) /* check for bad image dimensions */
return (FALSE);
if (to_width == 0 || to_height == 0) /* check for bad image dimensions */
return (FALSE);
if (from_x0 > from_x1 || from_y0 > from_y1) /* check for an invalid window */
return (FALSE);
/* find width and height of the window to magnify */
wind_width = (float64)((from_x1 - from_x0) + 1);
wind_height = (float64)((from_y1 - from_y0) + 1);
/* allocate room for the x coordinate lookup table */
x_coor = (int32 *)malloc((int32)((size_t)to_width * sizeof(int32)));
EXCHECK(x_coor == NULL, XCoorFailed); /* check if malloc() failed */
temp_val = wind_width / (float64)to_width;
for (u = 0; u < to_width; u++) /* calculate the x coordinate lookup table */
x_coor[u] = ((uint16)((float64)u * temp_val) + from_x0);
/* allocate room for the array of pointers */
y_coor = (uint8 **)malloc((int32)((size_t)to_height * sizeof(uint8 *)));
EXCHECK(y_coor == NULL, YCoorFailed); /* check if malloc() failed */
temp_val = wind_height / (float64)to_height;
for (u = 0; u < to_height; u++) /* calculate the y coordinates */
y_coor[u] = from_buffer + ((uint32)((float64)u * temp_val) + (uint32)from_y0) * (uint32)from_width;
last_buf = to_buffer; /* set the previous line pointer */
buf_off = to_buffer; /* set the pointer to the "to" image */
last_y_coor = NULL; /* force to calculate the first line */
for (u = 0; u < to_height; u++) { /* go through each magnified line */
/* if this line is not the same as the previous one, then make it again */
if (y_coor[u] != last_y_coor) {
last_y_coor = y_off = y_coor[u];
x_coor_temp = x_coor; /* assign the temporary pointer */
last_buf = buf_off; /* set the pointer to the previous line */
for (v = 0; v < to_width; v++) /* go through each line magnifying it */
*buf_off++ = y_off[*x_coor_temp++];
} /* end if */
/* this line is the same as the previous one, just copy it */
else {
memcpy(buf_off, last_buf, to_width); /* copy the previous line */
buf_off += to_width; /* advance the buffer offset pointer */
} /* end else */
} /* end for */
free(y_coor);
free(x_coor);
return (TRUE);
YCoorFailed: /* Failed to allocate memory for the Y coor. lookup table */
free(x_coor);
XCoorFailed: /* Failed to allocate memory for the X coor. lookup table */
return (FALSE);
} /* end magnify() */
/**********************************************************************
* Function : convert8to24
* Purpose : Convert an 8-bit image to a 24-bit image, using the
* palette components already set up.
* Parameters :
* img_8_buf - pointer to the buffer which contains the 8-bit image
* img24_buf - pointer to the buffer in which to place the
* 24-bit image
* img_xdim, img_ydim - the width and height of the images
* Returns : (TRUE) for success, (FALSE) for error
* Calls :
* Called by :
**********************************************************************/
static intn
convert8to24(uint8 *img8_buf, uint8 *img24_buf, int32 img_xdim, int32 img_ydim)
{
uint32 pixels; /* local counting variable */
if (img_xdim <= 0 || img_ydim <= 0) /* check for bad image dimensions */
return (FALSE);
if (img8_buf == NULL || img24_buf == NULL) /* check for invalid images */
return (FALSE);
pixels = (uint32)(img_xdim * img_ydim); /* get the number of pixels to process */
while (pixels > 0) { /* do all the pixels */
*img24_buf++ = red_comp[*img8_buf];
*img24_buf++ = green_comp[*img8_buf];
*img24_buf++ = blue_comp[*img8_buf];
img8_buf++;
pixels--;
} /* end while */
return (TRUE);
} /* end convert8to24() */
static void
usage(void)
{
printf("USAGE: make24 [-s<scale>] [-j] <input HDF file> <output HDF file>\n");
printf(" -s<scale> : set scale for magnifying the 8-bit input file.\n");
printf(" scales between 0 and 1 shrink the image, scales\n");
printf(" greater than 1 expand the image. Defaults to 1\n");
printf(" -j[quality] : use JPEG compression to store the 24-bit image\n");
printf(" Defaults to no compression, or quality level\n");
printf(" 75, if no quality is specified\n");
printf(" <input HDF file> : HDF file which contains an 8-bit image\n");
printf(" <output HDF file> : HDF file to store the 24-bit image\n");
exit(1);
} /* end usage() */
int
main(int argc, char *argv[])
{
intn do_jpeg = FALSE; /* flag to indicate JPEG compression */
intn jpeg_qual = 75; /* JPEG quality factor */
intn do_scale = FALSE; /* flag to indicate whether to scale images */
float32 img_scale = (float32)1.0; /* scaling factor */
int32 xdim, ydim; /* dimensions of the image to convert */
intn ispal; /* whether there's a palette with the image */
uint8 *img_buf; /* buffer to store the image in */
uint8 *img24_buf; /* buffer to store the 24-bit image in */
uint8 *pal_buf = NULL; /* buffer to store the palette in */
intn file = 1; /* the argument the files start at */
intn i; /* local counting variable */
if (argc < 3)
usage();
if (argv[1][0] == '-' || argv[1][0] == '/') { /* check command line */
if ((argv[1][1] != 's' && argv[1][1] != 'j') || argc < 4)
usage();
while (argv[file][0] == '-' || argv[file][0] == '/') {
switch (argv[file][1]) {
case 's':
if ((img_scale = (float32)atof(&argv[file][2])) <=
(float32)0.0) { /* check for valid scale */
printf("Bad scale, must be greater than 0\n");
return (1);
} /* end if */
do_scale = TRUE;
break;
case 'j':
if ((jpeg_qual = atoi(&argv[file][2])) <= 0 || jpeg_qual > 100) {
printf("Bad JPEG quality setting, should be between\n");
printf("1 and 100, using default value of 75\n");
jpeg_qual = 75;
} /* end if */
do_jpeg = TRUE;
break;
default:
usage();
} /* end switch */
file++;
} /* end while */
} /* end if */
/* get the image dimensions */
if (DFR8getdims(argv[file], &xdim, &ydim, &ispal) == FAIL) {
printf("Error, bad dimensions in file: %s\n", argv[file]);
HEprint(stdout, 0);
return (1);
} /* end if */
if ((img_buf = (uint8 *)malloc((size_t)(xdim * ydim))) == NULL) {
printf("Error, cannot allocate space for %dx%d image\n", (int)xdim, (int)ydim);
return (1);
} /* end if */
if (ispal) {
if ((pal_buf = (uint8 *)malloc(768)) == NULL) {
printf("Error, cannot allocate space for image palette\n");
return (1);
} /* end if */
} /* end if */
else
printf("No palette associated with image, using default grey scale conversion\n");
if (DFR8getimage(argv[file], img_buf, xdim, ydim, (ispal ? pal_buf : NULL)) == FAIL) {
printf("Error reading image\n");
HEprint(stdout, 0);
return (1);
} /* end if */
if (do_scale) { /* check whether we should scale the image */
uint8 *scaled_image; /* storage for the scaled image */
int32 new_xdim, new_ydim; /* the new image's x and y dim. */
new_xdim = (int32)(img_scale * (float32)xdim); /* calc. new image's dimensions */
new_ydim = (int32)(img_scale * (float32)ydim);
if ((scaled_image = (uint8 *)malloc((size_t)(new_xdim * new_ydim))) == NULL) {
printf("Error, cannot allocate space for %dx%d scaled image\n", (int)new_xdim, (int)new_ydim);
return (1);
} /* end if */
if (!magnify(img_buf, scaled_image, 0, 0, xdim - 1, ydim - 1, xdim, ydim, new_xdim, new_ydim)) {
printf("Error scaling image, out of memory or bad dimensions\n");
return (1);
}
free(img_buf); /* free the old image */
img_buf = scaled_image; /* use the new image for further processing */
xdim = new_xdim;
ydim = new_ydim;
} /* end if */
/* Generate the RGB components for the 8 -> 24 bit converter */
if (ispal) {
uint8 *pal_ptr = pal_buf; /* temporary pointer into the palette */
for (i = 0; i < 256; i++) {
red_comp[i] = *pal_ptr++;
green_comp[i] = *pal_ptr++;
blue_comp[i] = *pal_ptr++;
} /* end for */
} /* end if */
else { /* no palette, use a greyscale palette */
for (i = 0; i < 256; i++)
red_comp[i] = green_comp[i] = blue_comp[i] = (uint8)i;
} /* end else */
/* allocate space for the 24-bit image */
if ((img24_buf = (uint8 *)malloc((size_t)(xdim * ydim * 3))) == NULL) {
printf("Error, cannot allocate space for %dx%d 24-bit image\n", (int)xdim, (int)ydim);
return (1);
} /* end if */
/* convert the image */
if (!convert8to24(img_buf, img24_buf, xdim, ydim)) {
printf("Error converting 8-bit image to 24-bit image\n");
return (1);
} /* end if */
if (do_jpeg) { /* set up JPEG compression if necessary */
cinfo.jpeg.quality = jpeg_qual; /* set JPEG comp. parameters */
cinfo.jpeg.force_baseline = TRUE;
DF24setcompress(COMP_JPEG, &cinfo); /* set compression parameters */
} /* end if */
/* store 24-bit image */
if (DF24putimage(argv[file + 1], (void *)img24_buf, xdim, ydim) == FAIL) {
printf("Error storing 24-bit image\n");
HEprint(stdout, 0);
return (1);
} /* end if */
return (0);
} /* end make24 */
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