node_composite_diffMatte.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"

/* ******************* channel Difference Matte ********************************* */
static bNodeSocketTemplate cmp_node_diff_matte_in[]={
    {SOCK_RGBA,1,"Image 1", 1.0f, 1.0f, 1.0f, 1.0f},
    {SOCK_RGBA,1,"Image 2", 1.0f, 1.0f, 1.0f, 1.0f},
    {-1,0,""}
};

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

static void do_diff_matte(bNode *node, float *outColor, float *inColor1, float *inColor2)
{
    NodeChroma *c= (NodeChroma *)node->storage;
    float tolerence=c->t1;
    float falloff=c->t2;
    float difference;
    float alpha;

    difference= fabs(inColor2[0]-inColor1[0]) +
            fabs(inColor2[1]-inColor1[1]) +
            fabs(inColor2[2]-inColor1[2]);

    /*average together the distances*/
    difference=difference/3.0f;

    copy_v3_v3(outColor, inColor1);

    /*make 100% transparent*/
    if(difference < tolerence) {
        outColor[3]=0.0;
    }
    /*in the falloff region, make partially transparent */
    else if(difference < falloff+tolerence) {
        difference=difference-tolerence;
        alpha=difference/falloff;
        /*only change if more transparent than before */
        if(alpha < inColor1[3]) {
            outColor[3]=alpha;
        }
        else { /* leave as before */
            outColor[3]=inColor1[3];
        }
    }
    else {
        /*foreground object*/
        outColor[3]= inColor1[3];
    }
}

static void node_composit_exec_diff_matte(void *data, bNode *node, bNodeStack **in, bNodeStack **out)
{
    CompBuf *outbuf= NULL;
    CompBuf *imbuf1= NULL;
    CompBuf *imbuf2= NULL;
    /* NodeChroma *c; */ /* UNUSED */

    /*is anything connected?*/
    if(out[0]->hasoutput==0 && out[1]->hasoutput==0) return;

    /*must have an image imput*/
    if(in[0]->data==NULL) return;


    imbuf1=typecheck_compbuf(in[0]->data, CB_RGBA);

    /* if there's an image, use that, if not use the color */
    if(in[1]->data) {
        imbuf2=typecheck_compbuf(in[1]->data, CB_RGBA);
    }

    /* c=node->storage; */ /* UNUSED */
    outbuf=dupalloc_compbuf(imbuf1);

    /* note, processor gets a keyvals array passed on as buffer constant */
    composit2_pixel_processor(node, outbuf, imbuf1, in[0]->vec, imbuf2, in[1]->vec, do_diff_matte, CB_RGBA, CB_RGBA);

    out[0]->data=outbuf;
    if(out[1]->hasoutput)
        out[1]->data=valbuf_from_rgbabuf(outbuf, CHAN_A);
    generate_preview(data, node, outbuf);

    if(imbuf1!=in[0]->data)
        free_compbuf(imbuf1);

    if(imbuf2!=in[1]->data)
        free_compbuf(imbuf2);
}

static void node_composit_init_diff_matte(bNodeTree *UNUSED(ntree), bNode* node, bNodeTemplate *UNUSED(ntemp))
{
    NodeChroma *c= MEM_callocN(sizeof(NodeChroma), "node chroma");
    node->storage= c;
    c->t1= 0.1f;
    c->t2= 0.1f;
}

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

    node_type_base(ttype, &ntype, CMP_NODE_DIFF_MATTE, "Difference Key", NODE_CLASS_MATTE, NODE_PREVIEW|NODE_OPTIONS);
    node_type_socket_templates(&ntype, cmp_node_diff_matte_in, cmp_node_diff_matte_out);
    node_type_size(&ntype, 200, 80, 250);
    node_type_init(&ntype, node_composit_init_diff_matte);
    node_type_storage(&ntype, "NodeChroma", node_free_standard_storage, node_copy_standard_storage);
    node_type_exec(&ntype, node_composit_exec_diff_matte);

    nodeRegisterType(ttype, &ntype);
}