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/*
* render.c
*
* Render a high dynamic range buffer in some sensible way
*
* Copyright © 2012 Deutsches Elektronen-Synchrotron DESY,
* a research centre of the Helmholtz Association.
*
* Authors:
* 2009-2012 Thomas White <taw@physics.org>
*
* This file is part of CrystFEL.
*
* CrystFEL is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* CrystFEL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with CrystFEL. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <math.h>
#include <stdint.h>
#include "hdf5-file.h"
#include "render.h"
#include "peaks.h"
#include "filters.h"
#include "utils.h"
static void render_rgb(double val, double max,
double *rp, double *gp, double *bp)
{
int s;
double p;
double r, g, b;
s = val / (max/6);
p = fmod(val, max/6.0);
p /= (max/6.0);
r = 0.0; g = 0.0; b = 0.0;
if ( (val < 0.0) ) {
s = 0;
p = 0;
}
if ( (val > max) ) {
s = 6;
}
switch ( s ) {
case 0 : /* Black to blue */
r = 0; g = 0; b = p;
break;
case 1 : /* Blue to pink */
r = p; g = 0; b = 1.0;
break;
case 2 : /* Pink to red */
r = 1.0; g = 0; b = (1.0-p)*1.0;
break;
case 3 : /* Red to Orange */
r = 1.0; g = 0.5*p; b = 0;
break;
case 4 : /* Orange to Yellow */
r = 1.0; g = 0.5 + 0.5*p; b = 0;
break;
case 5 : /* Yellow to White */
r = 1.0; g = 1.0; b = 1.0*p;
break;
case 6 : /* Pixel has hit the maximum value */
r = 1.0; g = 1.0; b = 1.0;
break;
}
*rp = r;
*gp = g;
*bp = b;
}
static void render_ratio(double val, double max,
double *rp, double *gp, double *bp)
{
if ( val <= 1.0 ) {
render_rgb(val, 2.0, rp, gp, bp);
} else {
/* Your homework is to simplify this expression */
val = ((val-1.0)/(max-1.0)) * (max/2.0) + max/2.0;
render_rgb(val, max, rp, gp, bp);
}
}
static void render_mono(double val, double max,
double *rp, double *gp, double *bp)
{
double p;
p = val / max;
if ( val < 0.0 ) p = 0.0;
if ( val > max ) p = 1.0;
*rp = p;
*gp = p;
*bp = p;
}
static void render_invmono(double val, double max,
double *rp, double *gp, double *bp)
{
double p;
p = val / max;
p = 1.0 - p;
if ( val < 0.0 ) p = 1.0;
if ( val > max ) p = 0.0;
*rp = p;
*gp = p;
*bp = p;
}
void render_scale(double val, double max, int scale,
double *rp, double *gp, double *bp)
{
switch ( scale ) {
case SCALE_COLOUR :
render_rgb(val, max, rp, gp, bp);
break;
case SCALE_MONO :
render_mono(val, max, rp, gp, bp);
break;
case SCALE_INVMONO :
render_invmono(val, max, rp, gp, bp);
break;
case SCALE_RATIO :
render_ratio(val, max, rp, gp, bp);
break;
}
}
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