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/*
* render.c
*
* Render a high dynamic range buffer in some sensible way
*
* (c) 2008-2009 Thomas White <taw27@cam.ac.uk>
*
* hdfileview - view Ditabis Micron images
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <math.h>
#include <stdint.h>
#include "hdf5-file.h"
/* Set to 1 to measure mean intensity in a rectangle */
#define MEASURE_INT 0
#define RENDER_RGB \
\
int s; \
float p; \
\
s = val / (max/6); \
p = fmod(val, max/6); \
p /= (max/6); \
\
r = 0; g = 0; b = 0; \
\
if ( p < 0.0 ) p = 0.0; \
switch ( s ) { \
case 0 : { /* Black to blue */ \
r = 0; g = 0; b = p*255; \
break; \
} \
case 1 : { /* Blue to green */ \
r = 0; g = 255*p; b = (1-p)*255; \
break; \
} \
case 2 : { /* Green to red */ \
r =p*255; g = (1-p)*255; b = 0; \
break; \
} \
case 3 : { /* Red to Orange */ \
r = 255; g = 127*p; b = 0; \
break; \
} \
case 4 : { /* Orange to Yellow */ \
r = 255; g = 127 + 127*p; b = 0; \
break; \
} \
case 5 : { /* Yellow to White */ \
r = 255; g = 255; b = 255*p; \
break; \
} \
case 6 : { /* Pixel has hit the maximum value */ \
r = 255; g = 255; b = 255; \
break; \
} \
default : { /* Above saturation */ \
r = 255; g = 255; b = 255; \
break; \
} \
}
#define RENDER_MONO \
float p; \
p = (float)val / (float)max; \
if ( p < 0.0 ) p = 0.0; \
r = 255.0*p; g = 255.0*p; b = 255.0*p;
/* NB This function is shared between render_get_image() and
* render_get_colour_scale() */
static void render_free_data(guchar *data, gpointer p)
{
free(data);
}
/* Return a pixbuf containing a rendered version of the image after binning.
* This pixbuf might be scaled later - hopefully mostly in a downward
* direction. */
GdkPixbuf *render_get_image(struct hdfile *hdfile, int binning, int boostint,
int monochrome)
{
int mw, mh, w, h;
guchar *data;
int16_t *hdr;
size_t x, y;
int16_t max;
mw = hdfile_get_width(hdfile);
mh = hdfile_get_height(hdfile);
w = mw / binning;
h = mh / binning;
/* High dynamic range version */
hdr = hdfile_get_image_binned(hdfile, binning, &max);
if ( hdr == NULL ) return NULL;
/* Rendered (colourful) version */
data = malloc(3*w*h);
if ( data == NULL ) {
free(hdr);
return NULL;
}
max /= boostint;
if ( max <= 6 ) { max = 10; }
/* These x,y coordinates are measured relative to the bottom-left
* corner */
for ( y=0; y<h; y++ ) {
for ( x=0; x<w; x++ ) {
int val;
guchar r, g, b;
val = hdr[x+w*y];
if ( !monochrome ) {
RENDER_RGB
} else {
RENDER_MONO
}
/* Stuff inside square brackets makes this pixel go to
* the expected location in the pixbuf (which measures
* from the top-left corner */
data[3*( x+w*(h-1-y) )+0] = r;
data[3*( x+w*(h-1-y) )+1] = g;
data[3*( x+w*(h-1-y) )+2] = b;
}
}
/* Finished with this */
free(hdr);
/* Create the pixbuf from the 8-bit display data */
return gdk_pixbuf_new_from_data(data, GDK_COLORSPACE_RGB, FALSE, 8,
w, h, w*3, render_free_data, NULL);
}
GdkPixbuf *render_get_colour_scale(size_t w, size_t h, int monochrome)
{
guchar *data;
size_t x, y;
int max;
data = malloc(3*w*h);
if ( data == NULL ) return NULL;
max = h;
for ( y=0; y<h; y++ ) {
guchar r, g, b;
int val;
val = y;
if ( !monochrome ) {
RENDER_RGB
} else {
RENDER_MONO
}
data[3*( 0+w*(h-1-y) )+0] = 0;
data[3*( 0+w*(h-1-y) )+1] = 0;
data[3*( 0+w*(h-1-y) )+2] = 0;
for ( x=1; x<w; x++ ) {
data[3*( x+w*(h-1-y) )+0] = r;
data[3*( x+w*(h-1-y) )+1] = g;
data[3*( x+w*(h-1-y) )+2] = b;
}
}
return gdk_pixbuf_new_from_data(data, GDK_COLORSPACE_RGB, FALSE, 8,
w, h, w*3, render_free_data, NULL);
}
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