diff options
Diffstat (limited to 'source/blender/nodes/composite/nodes/node_composite_tonemap.c')
| -rw-r--r-- | source/blender/nodes/composite/nodes/node_composite_tonemap.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/source/blender/nodes/composite/nodes/node_composite_tonemap.c b/source/blender/nodes/composite/nodes/node_composite_tonemap.c new file mode 100644 index 00000000000..31ffed08c95 --- /dev/null +++ b/source/blender/nodes/composite/nodes/node_composite_tonemap.c @@ -0,0 +1,179 @@ +/* + * + * ***** 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 ***** + */ + +/** \file blender/nodes/composite/nodes/node_composite_tonemap.c + * \ingroup cmpnodes + */ + + +#include "node_composite_util.h" + +static bNodeSocketTemplate cmp_node_tonemap_in[]= { + { SOCK_RGBA, 1, "Image", 0.8f, 0.8f, 0.8f, 1.0f}, + { -1, 0, "" } +}; +static bNodeSocketTemplate cmp_node_tonemap_out[]= { + { SOCK_RGBA, 0, "Image"}, + { -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 *UNUSED(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(bNodeTree *UNUSED(ntree), bNode* node, bNodeTemplate *UNUSED(ntemp)) +{ + 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; +} + +void register_node_type_cmp_tonemap(ListBase *lb) +{ + static bNodeType ntype; + + node_type_base(&ntype, CMP_NODE_TONEMAP, "Tonemap", NODE_CLASS_OP_COLOR, NODE_OPTIONS); + node_type_socket_templates(&ntype, cmp_node_tonemap_in, cmp_node_tonemap_out); + node_type_size(&ntype, 150, 120, 200); + node_type_init(&ntype, node_composit_init_tonemap); + node_type_storage(&ntype, "NodeTonemap", node_free_standard_storage, node_copy_standard_storage); + node_type_exec(&ntype, node_composit_exec_tonemap); + + nodeRegisterType(lb, &ntype); +} + |