node_composite_colorMatte.c

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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., 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): Bob Holcomb
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "node_composite_util.h"

/* ******************* Color Key ********************************************************** */
static bNodeSocketTemplate cmp_node_color_in[]={
    {SOCK_RGBA,1,"Image", 1.0f, 1.0f, 1.0f, 1.0f},
    {SOCK_RGBA,1,"Key Color", 1.0f, 1.0f, 1.0f, 1.0f},
    {-1,0,""}
};

static bNodeSocketTemplate cmp_node_color_out[]={
    {SOCK_RGBA,0,"Image"},
    {SOCK_FLOAT,0,"Matte"},
    {-1,0,""}
};

static void do_color_key(bNode *node, float *out, float *in)
{
    float h_wrap;
    NodeChroma *c;
    c=node->storage;


    copy_v3_v3(out, in);

    if(
    /* do hue last because it needs to wrap, and does some more checks  */

    /* sat */   (fabsf(in[1]-c->key[1]) < c->t2) &&
    /* val */   (fabsf(in[2]-c->key[2]) < c->t3) &&

    /* multiply by 2 because it wraps on both sides of the hue,
     * otherwise 0.5 would key all hue's */

    /* hue */   ((h_wrap= 2.0f * fabsf(in[0]-c->key[0])) < c->t1 || (2.0f - h_wrap) < c->t1)
    ) {
        out[3]=0.0; /*make transparent*/
    }

    else { /*pixel is outside key color */
        out[3]=in[3]; /* make pixel just as transparent as it was before */
    }
}

static void node_composit_exec_color_matte(void *data, bNode *node, bNodeStack **in, bNodeStack **out)
{
    CompBuf *cbuf;
    CompBuf *colorbuf;
    NodeChroma *c;
    
    if(in[0]->hasinput==0) return;
    if(in[0]->data==NULL) return;
    if(out[0]->hasoutput==0 && out[1]->hasoutput==0) return;
    
    cbuf= typecheck_compbuf(in[0]->data, CB_RGBA);
    
    colorbuf= dupalloc_compbuf(cbuf);
    
    c=node->storage;
    
    /*convert rgbbuf to hsv*/
    composit1_pixel_processor(node, colorbuf, cbuf, in[0]->vec, do_rgba_to_hsva, CB_RGBA);
    
   /*convert key to hsv*/
    do_rgba_to_hsva(node, c->key, in[1]->vec);
    

    /*per pixel color key*/
    composit1_pixel_processor(node, colorbuf, colorbuf, in[0]->vec, do_color_key, CB_RGBA);
    
    /*convert back*/
    composit1_pixel_processor(node, colorbuf, colorbuf, in[0]->vec, do_hsva_to_rgba, CB_RGBA);
    
    out[0]->data= colorbuf;
    if(out[1]->hasoutput)
        out[1]->data= valbuf_from_rgbabuf(colorbuf, CHAN_A);
    
    generate_preview(data, node, colorbuf);

    if(cbuf!=in[0]->data)
        free_compbuf(cbuf);
}

static void node_composit_init_color_matte(bNodeTree *UNUSED(ntree), bNode* node, bNodeTemplate *UNUSED(ntemp))
{
    NodeChroma *c= MEM_callocN(sizeof(NodeChroma), "node color");
    node->storage= c;
    c->t1= 0.01f;
    c->t2= 0.1f;
    c->t3= 0.1f;
    c->fsize= 0.0f;
    c->fstrength= 1.0f;
}

void register_node_type_cmp_color_matte(bNodeTreeType *ttype)
{
    static bNodeType ntype;

    node_type_base(ttype, &ntype, CMP_NODE_COLOR_MATTE, "Color Key", NODE_CLASS_MATTE, NODE_PREVIEW|NODE_OPTIONS);
    node_type_socket_templates(&ntype, cmp_node_color_in, cmp_node_color_out);
    node_type_size(&ntype, 200, 80, 300);
    node_type_init(&ntype, node_composit_init_color_matte);
    node_type_storage(&ntype, "NodeChroma", node_free_standard_storage, node_copy_standard_storage);
    node_type_exec(&ntype, node_composit_exec_color_matte);

    nodeRegisterType(ttype, &ntype);
}