CMP_gamma.c

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/*
* $Id: CMP_gamma.c 35237 2011-02-27 20:13:22Z jesterking $
*
* ***** 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): none yet.
* 
* ***** END GPL LICENSE BLOCK *****

*/

#include "../CMP_util.h"

/* **************** Gamma Tools  ******************** */
  
static bNodeSocketType cmp_node_gamma_in[]= {
        {       SOCK_RGBA, 1, "Image",                  0.8f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f},
        {       SOCK_VALUE, 1, "Gamma",                 1.0f, 0.0f, 0.0f, 0.0f, 0.001f, 10.0f},
        {       -1, 0, ""       }
};
static bNodeSocketType cmp_node_gamma_out[]= {
        {       SOCK_RGBA, 0, "Image",                  0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
        {       -1, 0, ""       }
};

static void do_gamma(bNode *UNUSED(node), float *out, float *in, float *fac)
{
        int i=0;
        for(i=0; i<3; i++) {
                /* check for negative to avoid nan's */
                out[i] = (in[i] > 0.0f)? pow(in[i],fac[0]): in[i];
        }
        out[3] = in[3];
}
static void node_composit_exec_gamma(void *UNUSED(data), bNode *node, bNodeStack **in, bNodeStack **out)
{
        /* stack order in: Fac, Image */
        /* stack order out: Image */
        if(out[0]->hasoutput==0) return;
        
        /* input no image? then only color operation */
        if(in[0]->data==NULL) {
                do_gamma(node, out[0]->vec, in[0]->vec, in[1]->vec);
        }
        else {
                /* make output size of input image */
                CompBuf *cbuf= in[0]->data;
                CompBuf *stackbuf= alloc_compbuf(cbuf->x, cbuf->y, CB_RGBA, 1); // allocs
                
                composit2_pixel_processor(node, stackbuf, cbuf, in[0]->vec, in[1]->data, in[1]->vec, do_gamma, CB_RGBA, CB_VAL);

                out[0]->data= stackbuf;
        }
}

void register_node_type_cmp_gamma(ListBase *lb)
{
        static bNodeType ntype;
        
        node_type_base(&ntype, CMP_NODE_GAMMA, "Gamma", NODE_CLASS_OP_COLOR, NODE_OPTIONS,
                                   cmp_node_gamma_in, cmp_node_gamma_out);
        node_type_size(&ntype, 140, 100, 320);
        node_type_exec(&ntype, node_composit_exec_gamma);
        
        nodeRegisterType(lb, &ntype);
}