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/**
* $Id$
*
* ***** 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 *node, float *out, float *src, float *over, float *fac)
{
if(over[3]<=0.0f) {
QUATCOPY(out, src);
}
else if(*fac==1.0f && over[3]>=1.0f) {
QUATCOPY(out, over);
}
else {
float mul= 1.0f - *fac*over[3];
out[0]= (mul*src[0]) + *fac*over[0];
out[1]= (mul*src[1]) + *fac*over[1];
out[2]= (mul*src[2]) + *fac*over[2];
out[3]= (mul*src[3]) + *fac*over[3];
}
}
/* result will be still premul, but the over part is premulled */
static void do_alphaover_key(bNode *node, float *out, float *src, float *over, float *fac)
{
if(over[3]<=0.0f) {
QUATCOPY(out, src);
}
else if(*fac==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];
}
}
static void node_composit_exec_alphaover(void *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 */
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;
}
}
bNodeType cmp_node_alphaover= {
/* *next,*prev */ NULL, NULL,
/* type code */ CMP_NODE_ALPHAOVER,
/* name */ "AlphaOver",
/* width+range */ 80, 40, 120,
/* class+opts */ NODE_CLASS_OP_COLOR, NODE_OPTIONS,
/* input sock */ cmp_node_alphaover_in,
/* output sock */ cmp_node_alphaover_out,
/* storage */ "",
/* execfunc */ node_composit_exec_alphaover,
/* butfunc */ NULL,
/* initfunc */ NULL,
/* freestoragefunc */ NULL,
/* copystoragefunc */ NULL,
/* id */ NULL
};
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