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/*
* colscale.c
*
* Colour scales
*
* Copyright © 2012-2021 Deutsches Elektronen-Synchrotron DESY,
* a research centre of the Helmholtz Association.
*
* Authors:
* 2009-2020 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 "colscale.h"
/** \file colscale.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) ) {
p = fabs(val) / (max/6.0);
*rp = 0.0;
*gp = 0.5*p;
*bp = 0.0;
return;
}
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_geoptimiser(double val, double max,
double *rp, double *gp, double *bp)
{
double r;
double p;
r = val/max;
if ( val < 0.0 ) {
*rp = 0.0;
*gp = 0.0;
*bp = 0.0;
return;
}
if ( r >= 0.0 && r < 0.059 ) {
p = (r-0.0)/(0.059-0.0);
*rp = 0.0;
*gp = 0.0;
*bp = ((91.0/256.0)-0.0)*p;
return;
}
if ( r >= 0.059 && r < 0.220 ) {
p = (r-0.059)/(0.220-0.059);
*rp = ((122.0/256.0)-0.0)*p;
*gp = 0.0;
*bp = ((227.0/256.0)-(91.0/256.0))*p+(91.0/256.0);
return;
}
if ( r >= 0.220 && r < 0.376 ) {
p = (r-0.220)/(0.376-0.220);
*rp = ((195.0/256.0)-(122.0/256.0))*p+(122.0/256.0);
*gp = 0.0;
*bp = ((93.0/256.0)-(227.0/256.0))*p+(227.0/256.0);
return;
}
if ( r >= 0.376 && r < 0.498 ) {
p = (r-0.376)/(0.498-0.376);
*rp = ((238.0/256.0)-(195.0/256.0))*p+(195.0/256.0);
*gp = ((76.0/256.0)-0.0)*p;
*bp = (0.0-(93.0/256.0))*p+(93.0/256.0);
return;
}
if ( r >= 0.498 && r < 0.564 ) {
p = (r-0.498)/(0.564-0.498);
*rp = (1.0-(238.0/256.0))*p+(238.0/256.0);
*gp = ((117.0/256.0)-(76.0/256.0))*p+(76.0/256.0);
*bp = 0.0;
return;
}
if ( r >= 0.564 && r < 0.815 ) {
p = (r-0.564)/(0.815-0.564);
*rp = 1.0;
*gp = ((234.0/256.0)-(117.0/256.0))*p+(117.0/256.0);
*bp = 0.0;
return;
}
if ( r >= 0.815 && r < 1.0 ) {
p = (r-0.815)/(1.0-0.815);
*rp = 1.0;
*gp = (1.0-(234.0/256.0))*p+(234.0/256.0);
*bp = (1.0-0.0)*p;
return;
}
if ( r >= 1.0 ) {
*rp = 1.0; *gp = 1.0; *bp = 1.0;
return;
}
}
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 colscale_lookup(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;
case SCALE_GEOPTIMISER :
render_geoptimiser(val, max, rp, gp, bp);
break;
}
}
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