node_composite_setalpha.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): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "node_composite_util.h"

/* **************** SET ALPHA ******************** */
static bNodeSocketTemplate cmp_node_setalpha_in[]= {
    {   SOCK_RGBA, 1, "Image",          0.0f, 0.0f, 0.0f, 1.0f},
    {   SOCK_FLOAT, 1, "Alpha",         1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, PROP_NONE},
    {   -1, 0, ""   }
};
static bNodeSocketTemplate cmp_node_setalpha_out[]= {
    {   SOCK_RGBA, 0, "Image"},
    {   -1, 0, ""   }
};

static void node_composit_exec_setalpha(void *UNUSED(data), bNode *node, bNodeStack **in, bNodeStack **out)
{
    /* stack order out: RGBA image */
    /* stack order in: col, alpha */
    
    /* input no image? then only color operation */
    if(in[0]->data==NULL && in[1]->data==NULL) {
        out[0]->vec[0] = in[0]->vec[0];
        out[0]->vec[1] = in[0]->vec[1];
        out[0]->vec[2] = in[0]->vec[2];
        out[0]->vec[3] = in[1]->vec[0];
    }
    else {
        /* make output size of input image */
        CompBuf *cbuf= in[0]->data?in[0]->data:in[1]->data;
        CompBuf *stackbuf= alloc_compbuf(cbuf->x, cbuf->y, CB_RGBA, 1); /* allocs */
        
        if(in[1]->data==NULL && in[1]->vec[0]==1.0f) {
            /* pass on image */
            composit1_pixel_processor(node, stackbuf, in[0]->data, in[0]->vec, do_copy_rgb, CB_RGBA);
        }
        else {
            /* send an compbuf or a value to set as alpha - composit2_pixel_processor handles choosing the right one */
            composit2_pixel_processor(node, stackbuf, in[0]->data, in[0]->vec, in[1]->data, in[1]->vec, do_copy_a_rgba, CB_RGBA, CB_VAL);
        }
    
        out[0]->data= stackbuf;
    }
}

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

    node_type_base(ttype, &ntype, CMP_NODE_SETALPHA, "Set Alpha", NODE_CLASS_CONVERTOR, NODE_OPTIONS);
    node_type_socket_templates(&ntype, cmp_node_setalpha_in, cmp_node_setalpha_out);
    node_type_size(&ntype, 120, 40, 140);
    node_type_exec(&ntype, node_composit_exec_setalpha);

    nodeRegisterType(ttype, &ntype);
}