CMP_lummaMatte.c

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/*
 * $Id: CMP_lummaMatte.c 36276 2011-04-21 15:53:30Z campbellbarton $
 *
 * ***** 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 "../CMP_util.h"


/* ******************* Luma Matte Node ********************************* */
static bNodeSocketType cmp_node_luma_matte_in[]={
        {SOCK_RGBA,1,"Image", 0.8f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f},
        {-1,0,""}
};

static bNodeSocketType cmp_node_luma_matte_out[]={
        {SOCK_RGBA,0,"Image", 0.8f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f},
        {SOCK_VALUE,0,"Matte",0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
        {-1,0,""}
};

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

        alpha=0.0;

        /* test range*/
        if(in[0]>c->t1) {
                alpha=1.0;
        }
        else if(in[0]<c->t2){
                alpha=0.0;
        }
        else {/*blend */
                alpha=(in[0]-c->t2)/(c->t1-c->t2);
        }
        
        /* don't make something that was more transparent less transparent */
        if (alpha<in[3]) {
                out[3]=alpha;
        }
        else {
                out[3]=in[3];
        }

}

static void node_composit_exec_luma_matte(void *data, bNode *node, bNodeStack **in, bNodeStack **out)
{
        CompBuf *cbuf;
        CompBuf *outbuf;
        
        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);
        
        outbuf=dupalloc_compbuf(cbuf);

        composit1_pixel_processor(node, outbuf, cbuf, in[1]->vec, do_rgba_to_yuva, CB_RGBA);
        composit1_pixel_processor(node, outbuf, outbuf, in[1]->vec, do_luma_matte, CB_RGBA);
        composit1_pixel_processor(node, outbuf, outbuf, in[1]->vec, do_yuva_to_rgba, CB_RGBA);
        
        generate_preview(data, node, outbuf);
        out[0]->data=outbuf;
        if (out[1]->hasoutput)
                out[1]->data=valbuf_from_rgbabuf(outbuf, CHAN_A);
        if(cbuf!=in[0]->data)
                free_compbuf(cbuf);
}

static void node_composit_init_luma_matte(bNode *node)
{
        NodeChroma *c= MEM_callocN(sizeof(NodeChroma), "node chroma");
        node->storage=c;
        c->t1= 1.0f;
        c->t2= 0.0f;
}

void register_node_type_cmp_luma_matte(ListBase *lb)
{
        static bNodeType ntype;

        node_type_base(&ntype, CMP_NODE_LUMA_MATTE, "Luminance Key", NODE_CLASS_MATTE, NODE_PREVIEW|NODE_OPTIONS,
                cmp_node_luma_matte_in, cmp_node_luma_matte_out);
        node_type_size(&ntype, 200, 80, 250);
        node_type_init(&ntype, node_composit_init_luma_matte);
        node_type_storage(&ntype, "NodeChroma", node_free_standard_storage, node_copy_standard_storage);
        node_type_exec(&ntype, node_composit_exec_luma_matte);

        nodeRegisterType(lb, &ntype);
}