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/**
*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2006 Blender Foundation.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): Alfredo de Greef (eeshlo)
*
* ***** END GPL LICENSE BLOCK *****
*/
#include "../CMP_util.h"
static bNodeSocketType cmp_node_tonemap_in[]= {
{ SOCK_RGBA, 1, "Image", 0.8f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f},
{ -1, 0, "" }
};
static bNodeSocketType cmp_node_tonemap_out[]= {
{ SOCK_RGBA, 0, "Image", 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
{ -1, 0, "" }
};
static float avgLogLum(CompBuf *src, float* auto_key, float* Lav, float* Cav)
{
float lsum = 0;
int p = src->x*src->y;
fRGB* bc = (fRGB*)src->rect;
float avl, maxl = -1e10f, minl = 1e10f;
const float sc = 1.f/(src->x*src->y);
*Lav = 0.f;
while (p--) {
float L = 0.212671f*bc[0][0] + 0.71516f*bc[0][1] + 0.072169f*bc[0][2];
*Lav += L;
fRGB_add(Cav, bc[0]);
lsum += (float)log((double)MAX2(L, 0.0) + 1e-5);
maxl = (L > maxl) ? L : maxl;
minl = (L < minl) ? L : minl;
bc++;
}
*Lav *= sc;
fRGB_mult(Cav, sc);
maxl = log((double)maxl + 1e-5); minl = log((double)minl + 1e-5f); avl = lsum*sc;
*auto_key = (maxl > minl) ? ((maxl - avl) / (maxl - minl)) : 1.f;
return exp((double)avl);
}
static void tonemap(NodeTonemap* ntm, CompBuf* dst, CompBuf* src)
{
int x, y;
float dr, dg, db, al, igm = (ntm->gamma==0.f) ? 1 : (1.f / ntm->gamma);
float auto_key, Lav, Cav[3] = {0, 0, 0};
al = avgLogLum(src, &auto_key, &Lav, Cav);
al = (al == 0.f) ? 0.f : (ntm->key / al);
if (ntm->type == 1) {
// Reinhard/Devlin photoreceptor
const float f = exp((double)-ntm->f);
const float m = (ntm->m > 0.f) ? ntm->m : (0.3f + 0.7f*pow((double)auto_key, 1.4));
const float ic = 1.f - ntm->c, ia = 1.f - ntm->a;
if (ntm->m == 0.f) printf("tonemap node, M: %g\n", m);
for (y=0; y<src->y; ++y) {
fRGB* sp = (fRGB*)&src->rect[y*src->x*src->type];
fRGB* dp = (fRGB*)&dst->rect[y*src->x*src->type];
for (x=0; x<src->x; ++x) {
const float L = 0.212671f*sp[x][0] + 0.71516f*sp[x][1] + 0.072169f*sp[x][2];
float I_l = sp[x][0] + ic*(L - sp[x][0]);
float I_g = Cav[0] + ic*(Lav - Cav[0]);
float I_a = I_l + ia*(I_g - I_l);
dp[x][0] /= (dp[x][0] + pow((double)f*I_a, (double)m));
I_l = sp[x][1] + ic*(L - sp[x][1]);
I_g = Cav[1] + ic*(Lav - Cav[1]);
I_a = I_l + ia*(I_g - I_l);
dp[x][1] /= (dp[x][1] + pow((double)f*I_a,(double)m));
I_l = sp[x][2] + ic*(L - sp[x][2]);
I_g = Cav[2] + ic*(Lav - Cav[2]);
I_a = I_l + ia*(I_g - I_l);
dp[x][2] /= (dp[x][2] + pow((double)f*I_a, (double)m));
}
}
return;
}
// Reinhard simple photographic tm (simplest, not using whitepoint var)
for (y=0; y<src->y; y++) {
fRGB* sp = (fRGB*)&src->rect[y*src->x*src->type];
fRGB* dp = (fRGB*)&dst->rect[y*src->x*src->type];
for (x=0; x<src->x; x++) {
fRGB_copy(dp[x], sp[x]);
fRGB_mult(dp[x], al);
dr = dp[x][0] + ntm->offset;
dg = dp[x][1] + ntm->offset;
db = dp[x][2] + ntm->offset;
dp[x][0] /= ((dr == 0.f) ? 1.f : dr);
dp[x][1] /= ((dg == 0.f) ? 1.f : dg);
dp[x][2] /= ((db == 0.f) ? 1.f : db);
if (igm != 0.f) {
dp[x][0] = pow((double)MAX2(dp[x][0], 0.), igm);
dp[x][1] = pow((double)MAX2(dp[x][1], 0.), igm);
dp[x][2] = pow((double)MAX2(dp[x][2], 0.), igm);
}
}
}
}
static void node_composit_exec_tonemap(void *data, bNode *node, bNodeStack **in, bNodeStack **out)
{
CompBuf *new, *img = in[0]->data;
if ((img==NULL) || (out[0]->hasoutput==0)) return;
if (img->type != CB_RGBA)
img = typecheck_compbuf(img, CB_RGBA);
new = dupalloc_compbuf(img);
tonemap(node->storage, new, img);
out[0]->data = new;
if(img!=in[0]->data)
free_compbuf(img);
}
static void node_composit_init_tonemap(bNode* node)
{
NodeTonemap *ntm = MEM_callocN(sizeof(NodeTonemap), "node tonemap data");
ntm->type = 1;
ntm->key = 0.18;
ntm->offset = 1;
ntm->gamma = 1;
ntm->f = 0;
ntm->m = 0; // actual value is set according to input
// default a of 1 works well with natural HDR images, but not always so for cgi.
// Maybe should use 0 or at least lower initial value instead
ntm->a = 1;
ntm->c = 0;
node->storage = ntm;
}
bNodeType cmp_node_tonemap = {
/* *next,*prev */ NULL, NULL,
/* type code */ CMP_NODE_TONEMAP,
/* name */ "Tonemap",
/* width+range */ 150, 120, 200,
/* class+opts */ NODE_CLASS_OP_COLOR, NODE_OPTIONS,
/* input sock */ cmp_node_tonemap_in,
/* output sock */ cmp_node_tonemap_out,
/* storage */ "NodeTonemap",
/* execfunc */ node_composit_exec_tonemap,
/* butfunc */ NULL,
/* initfunc */ node_composit_init_tonemap,
/* freestoragefunc */ node_free_standard_storage,
/* copystoragefunc */ node_copy_standard_storage,
/* id */ NULL
};
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