CMP_alphaOver.c

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/*
 * $Id: CMP_alphaOver.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): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "../CMP_util.h"

/* **************** ALPHAOVER ******************** */
static bNodeSocketType cmp_node_alphaover_in[]= {
        {       SOCK_VALUE, 1, "Fac",                   1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f},
        {       SOCK_RGBA, 1, "Image",                  0.8f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f},
        {       SOCK_RGBA, 1, "Image",                  0.8f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f},
        {       -1, 0, ""       }
};
static bNodeSocketType cmp_node_alphaover_out[]= {
        {       SOCK_RGBA, 0, "Image",                  0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
        {       -1, 0, ""       }
};

static void do_alphaover_premul(bNode *UNUSED(node), float *out, float *src, float *over, float *fac)
{
        
        if(over[3]<=0.0f) {
                QUATCOPY(out, src);
        }
        else if(fac[0]==1.0f && over[3]>=1.0f) {
                QUATCOPY(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) {
                QUATCOPY(out, src);
        }
        else if(fac[0]==1.0f && over[3]>=1.0f) {
                QUATCOPY(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) {
                QUATCOPY(out, src);
        }
        else if(fac[0]==1.0f && over[3]>=1.0f) {
                QUATCOPY(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(bNode* node)
{
        node->storage= MEM_callocN(sizeof(NodeTwoFloats), "NodeTwoFloats");
}

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

        node_type_base(&ntype, CMP_NODE_ALPHAOVER, "AlphaOver", NODE_CLASS_OP_COLOR, NODE_OPTIONS,
                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(lb, &ntype);
}