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/*
* Gamma Correction Plugin (RGB Version) 0.01
*
* Copyright (c) 2005 Peter Schlaile
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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.
*
*/
#include <math.h>
#include "plugin.h"
#include "util.h"
#include <stdio.h>
#define alpha_epsilon 0.0001f
char name[]= "Gamma Correction";
VarStruct varstr[]= {
{ NUMSLI|FLO, "St M:", 0.0, -1.0, 1.0, "Setup Main"},
{ NUMSLI|FLO, "Gn M:", 1.0, 0.0, 10.0,"Gain Main"},
{ NUMSLI|FLO, "Ga M:", 1.0, 0.0, 10.0, "Gamma Main"},
{ NUMSLI|FLO, "St R:", 0.0, -1.0, 1.0, "Setup Red"},
{ NUMSLI|FLO, "Gn R:", 1.0, 0.0, 10.0,"Gain Red"},
{ NUMSLI|FLO, "Ga R:", 1.0, 0.0, 10.0, "Gamma Red"},
{ NUMSLI|FLO, "St G:", 0.0, -1.0, 1.0, "Setup Green"},
{ NUMSLI|FLO, "Gn G:", 1.0, 0.0, 10.0,"Gain Green"},
{ NUMSLI|FLO, "Ga G:", 1.0, 0.0, 10.0, "Gamma Green"},
{ NUMSLI|FLO, "St B:", 0.0, -1.0, 1.0, "Setup Blue"},
{ NUMSLI|FLO, "Gn B:", 1.0, 0.0, 10.0,"Gain Blue"},
{ NUMSLI|FLO, "Ga B:", 1.0, 0.0, 10.0, "Gamma Blue"},
};
typedef struct Cast {
float setup_m;
float gain_m;
float gamma_m;
float setup_r;
float gain_r;
float gamma_r;
float setup_g;
float gain_g;
float gamma_g;
float setup_b;
float gain_b;
float gamma_b;
} Cast;
float cfra;
void plugin_seq_doit(Cast *, float, float, int, int, ImBuf *, ImBuf *, ImBuf *, ImBuf *);
int plugin_seq_getversion(void) { return B_PLUGIN_VERSION; }
void plugin_but_changed(int but) {}
void plugin_init() {}
void plugin_getinfo(PluginInfo *info)
{
info->name= name;
info->nvars= sizeof(varstr)/sizeof(VarStruct);
info->cfra= &cfra;
info->varstr= varstr;
info->init= plugin_init;
info->seq_doit= (SeqDoit) plugin_seq_doit;
info->callback= plugin_but_changed;
}
static void make_gamma_table(float setup, float gain, float gamma,
unsigned char * table)
{
int y;
for (y = 0; y < 256; y++) {
float v = 1.0 * y / 255;
v += setup;
v *= gain;
v = pow(v, gamma);
if ( v > 1.0) {
v = 1.0;
} else if (v < 0.0) {
v = 0.0;
}
table[y] = v * 255;
}
}
void plugin_seq_doit(Cast *cast, float facf0, float facf1, int width,
int height, ImBuf *ibuf1, ImBuf *ibuf2, ImBuf *out, ImBuf *use) {
if (!out->rect_float)
{
unsigned char *dest, *src1, *src2;
int x, y, c;
unsigned char gamma_table_m[256];
unsigned char gamma_table_r[256];
unsigned char gamma_table_g[256];
unsigned char gamma_table_b[256];
if (!ibuf1) return;
dest= (unsigned char *) out->rect;
src1= (unsigned char *) ibuf1->rect;
make_gamma_table(cast->setup_m, cast->gain_m, cast->gamma_m,
gamma_table_m);
make_gamma_table(cast->setup_r, cast->gain_r, cast->gamma_r,
gamma_table_r);
make_gamma_table(cast->setup_g, cast->gain_g, cast->gamma_g,
gamma_table_g);
make_gamma_table(cast->setup_b, cast->gain_b, cast->gamma_b,
gamma_table_b);
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
*dest++ = gamma_table_r[gamma_table_m[*src1++]];
*dest++ = gamma_table_g[gamma_table_m[*src1++]];
*dest++ = gamma_table_b[gamma_table_m[*src1++]];
dest++; src1++;
}
}
}
else
{
float *i=ibuf1->rect_float;
float *o=out->rect_float;
unsigned int size=width*height;
unsigned int k;
float val_r[3]={cast->setup_r,cast->gain_r,cast->gamma_r};
float val_g[3]={cast->setup_g,cast->gain_g,cast->gamma_g};
float val_b[3]={cast->setup_b,cast->gain_b,cast->gamma_b};
float *vals[3]={val_r,val_g,val_b};
for (k=0;k<size;++k)
{
if (cast->gamma_m!=1.f || cast->setup_m!=0.f || cast->gain_m!=1.f)
{
float alpha=CLAMP(i[3],0.f,1.f);
if (alpha>alpha_epsilon) {
int l;
for (l=0;l<3;++l)
{
float *val=vals[l];
o[l]=i[l]/alpha;
o[l]=pow((o[l]+cast->setup_m)*cast->gain_m,cast->gamma_m);
if (val[2]!=1.f || val[0]!=0.f || val[1]!=1.f)
{
o[l]=pow((o[l]+val[0])*val[1],val[2]);
}
o[l]*=alpha;
o[l]=CLAMP(o[l],0.f,1.f);
}
} else {
o[0]=o[1]=o[2]=0.0;
}
o[3]=1.0;
}
else
{
int l;
for (l=0;l<3;++l)
o[l]=CLAMP(i[l],0.f,1.f);
o[3]=1.0;
}
i+=4;
o+=4;
}
}
}
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