node_composite_colorbalance.c

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/*
 * 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.
 */
 
#include "node_composite_util.h"
 
/* ******************* Color Balance ********************************* */
static bNodeSocketTemplate cmp_node_colorbalance_in[] = {
    {SOCK_FLOAT, N_("Fac"), 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, PROP_FACTOR},
    {SOCK_RGBA, N_("Image"), 1.0f, 1.0f, 1.0f, 1.0f},
    {-1, ""},
};
 
static bNodeSocketTemplate cmp_node_colorbalance_out[] = {
    {SOCK_RGBA, N_("Image")},
    {-1, ""},
};
 
/* Sync functions update formula parameters for other modes, such that the result is comparable.
 * Note that the results are not exactly the same due to differences in color handling
 * (sRGB conversion happens for LGG),
 * but this keeps settings comparable.
 */
 
void ntreeCompositColorBalanceSyncFromLGG(bNodeTree *UNUSED(ntree), bNode *node)
{
  NodeColorBalance *n = node->storage;
  int c;
 
  for (c = 0; c < 3; c++) {
    n->slope[c] = (2.0f - n->lift[c]) * n->gain[c];
    n->offset[c] = (n->lift[c] - 1.0f) * n->gain[c];
    n->power[c] = (n->gamma[c] != 0.0f) ? 1.0f / n->gamma[c] : 1000000.0f;
  }
}
 
void ntreeCompositColorBalanceSyncFromCDL(bNodeTree *UNUSED(ntree), bNode *node)
{
  NodeColorBalance *n = node->storage;
  int c;
 
  for (c = 0; c < 3; c++) {
    float d = n->slope[c] + n->offset[c];
    n->lift[c] = (d != 0.0f ? n->slope[c] + 2.0f * n->offset[c] / d : 0.0f);
    n->gain[c] = d;
    n->gamma[c] = (n->power[c] != 0.0f) ? 1.0f / n->power[c] : 1000000.0f;
  }
}
 
static void node_composit_init_colorbalance(bNodeTree *UNUSED(ntree), bNode *node)
{
  NodeColorBalance *n = node->storage = MEM_callocN(sizeof(NodeColorBalance), "node colorbalance");
 
  n->lift[0] = n->lift[1] = n->lift[2] = 1.0f;
  n->gamma[0] = n->gamma[1] = n->gamma[2] = 1.0f;
  n->gain[0] = n->gain[1] = n->gain[2] = 1.0f;
 
  n->slope[0] = n->slope[1] = n->slope[2] = 1.0f;
  n->offset[0] = n->offset[1] = n->offset[2] = 0.0f;
  n->power[0] = n->power[1] = n->power[2] = 1.0f;
}
 
void register_node_type_cmp_colorbalance(void)
{
  static bNodeType ntype;
 
  cmp_node_type_base(&ntype, CMP_NODE_COLORBALANCE, "Color Balance", NODE_CLASS_OP_COLOR, 0);
  node_type_socket_templates(&ntype, cmp_node_colorbalance_in, cmp_node_colorbalance_out);
  node_type_size(&ntype, 400, 200, 400);
  node_type_init(&ntype, node_composit_init_colorbalance);
  node_type_storage(
      &ntype, "NodeColorBalance", node_free_standard_storage, node_copy_standard_storage);
 
  nodeRegisterType(&ntype);
}