node_composite_alphaOver.c

Go to the documentation of this file.

/*
 * ***** 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 "node_composite_util.h"

/* **************** ALPHAOVER ******************** */
static bNodeSocketTemplate cmp_node_alphaover_in[]= {
    {   SOCK_FLOAT, 1, "Fac",           1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, PROP_FACTOR},
    {   SOCK_RGBA, 1, "Image",          1.0f, 1.0f, 1.0f, 1.0f},
    {   SOCK_RGBA, 1, "Image",          1.0f, 1.0f, 1.0f, 1.0f},
    {   -1, 0, ""   }
};
static bNodeSocketTemplate cmp_node_alphaover_out[]= {
    {   SOCK_RGBA, 0, "Image"},
    {   -1, 0, ""   }
};

static void do_alphaover_premul(bNode *UNUSED(node), float *out, float *src, float *over, float *fac)
{
    
    /* Zero alpha values should still permit an add of RGB data */  
    if(over[3]<0.0f) {
        copy_v4_v4(out, src);
    }
    else if(fac[0]==1.0f && over[3]>=1.0f) {
        copy_v4_v4(out, over);
    }
    else {
        float mul= 1.0f - fac[0]*over[3];

        out[0]= (mul*src[0]) + fac[0]*over[0];
        out[1]= (mul*src[1]) + fac[0]*over[1];
        out[2]= (mul*src[2]) + fac[0]*over[2];
        out[3]= (mul*src[3]) + fac[0]*over[3];
    }   
}

/* result will be still premul, but the over part is premulled */
static void do_alphaover_key(bNode *UNUSED(node), float *out, float *src, float *over, float *fac)
{
    
    if(over[3]<=0.0f) {
        copy_v4_v4(out, src);
    }
    else if(fac[0]==1.0f && over[3]>=1.0f) {
        copy_v4_v4(out, over);
    }
    else {
        float premul= fac[0]*over[3];
        float mul= 1.0f - premul;

        out[0]= (mul*src[0]) + premul*over[0];
        out[1]= (mul*src[1]) + premul*over[1];
        out[2]= (mul*src[2]) + premul*over[2];
        out[3]= (mul*src[3]) + fac[0]*over[3];
    }
}

/* result will be still premul, but the over part is premulled */
static void do_alphaover_mixed(bNode *node, float *out, float *src, float *over, float *fac)
{
    
    if(over[3]<=0.0f) {
        copy_v4_v4(out, src);
    }
    else if(fac[0]==1.0f && over[3]>=1.0f) {
        copy_v4_v4(out, over);
    }
    else {
        NodeTwoFloats *ntf= node->storage;
        float addfac= 1.0f - ntf->x + over[3]*ntf->x;
        float premul= fac[0]*addfac;
        float mul= 1.0f - fac[0]*over[3];
        
        out[0]= (mul*src[0]) + premul*over[0];
        out[1]= (mul*src[1]) + premul*over[1];
        out[2]= (mul*src[2]) + premul*over[2];
        out[3]= (mul*src[3]) + fac[0]*over[3];
    }
}




static void node_composit_exec_alphaover(void *UNUSED(data), bNode *node, bNodeStack **in, bNodeStack **out)
{
    /* stack order in: col col */
    /* stack order out: col */
    if(out[0]->hasoutput==0) 
        return;
    
    /* input no image? then only color operation */
    if(in[1]->data==NULL && in[2]->data==NULL) {
        do_alphaover_premul(node, out[0]->vec, in[1]->vec, in[2]->vec, in[0]->vec);
    }
    else {
        /* make output size of input image */
        CompBuf *cbuf= in[1]->data?in[1]->data:in[2]->data;
        CompBuf *stackbuf= alloc_compbuf(cbuf->x, cbuf->y, CB_RGBA, 1); /* allocs */
        NodeTwoFloats *ntf= node->storage;
        
        if(ntf->x != 0.0f)
            composit3_pixel_processor(node, stackbuf, in[1]->data, in[1]->vec, in[2]->data, in[2]->vec, in[0]->data, in[0]->vec, do_alphaover_mixed, CB_RGBA, CB_RGBA, CB_VAL);
        else if(node->custom1)
            composit3_pixel_processor(node, stackbuf, in[1]->data, in[1]->vec, in[2]->data, in[2]->vec, in[0]->data, in[0]->vec, do_alphaover_key, CB_RGBA, CB_RGBA, CB_VAL);
        else
            composit3_pixel_processor(node, stackbuf, in[1]->data, in[1]->vec, in[2]->data, in[2]->vec, in[0]->data, in[0]->vec, do_alphaover_premul, CB_RGBA, CB_RGBA, CB_VAL);
        
        out[0]->data= stackbuf;
    }
}

static void node_alphaover_init(bNodeTree *UNUSED(ntree), bNode* node, bNodeTemplate *UNUSED(ntemp))
{
    node->storage= MEM_callocN(sizeof(NodeTwoFloats), "NodeTwoFloats");
}

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

    node_type_base(ttype, &ntype, CMP_NODE_ALPHAOVER, "AlphaOver", NODE_CLASS_OP_COLOR, NODE_OPTIONS);
    node_type_socket_templates(&ntype, cmp_node_alphaover_in, cmp_node_alphaover_out);
    node_type_size(&ntype, 80, 40, 120);
    node_type_init(&ntype, node_alphaover_init);
    node_type_storage(&ntype, "NodeTwoFloats", node_free_standard_storage, node_copy_standard_storage);
    node_type_exec(&ntype, node_composit_exec_alphaover);

    nodeRegisterType(ttype, &ntype);
}