CMP_invert.c

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/*
 * $Id: CMP_invert.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"

/* **************** INVERT ******************** */
static bNodeSocketType cmp_node_invert_in[]= { 
        { SOCK_VALUE, 1, "Fac", 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f}, 
        { SOCK_RGBA, 1, "Color", 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f}, 
        { -1, 0, "" } 
};

static bNodeSocketType cmp_node_invert_out[]= { 
        { SOCK_RGBA, 0, "Color", 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f}, 
        { -1, 0, "" } 
};

static void do_invert(bNode *node, float *out, float *in)
{
        if(node->custom1 & CMP_CHAN_RGB) {
                out[0] = 1.0f - in[0];
                out[1] = 1.0f - in[1];
                out[2] = 1.0f - in[2];
        } else
                VECCOPY(out, in);
                
        if(node->custom1 & CMP_CHAN_A)
                out[3] = 1.0f - in[3];
        else
                out[3] = in[3];
}

static void do_invert_fac(bNode *node, float *out, float *in, float *fac)
{
        float col[4], facm;

        do_invert(node, col, in);

        /* blend inverted result against original input with fac */
        facm = 1.0 - fac[0];

        if(node->custom1 & CMP_CHAN_RGB) {
                col[0] = fac[0]*col[0] + (facm*in[0]);
                col[1] = fac[0]*col[1] + (facm*in[1]);
                col[2] = fac[0]*col[2] + (facm*in[2]);
        }
        if(node->custom1 & CMP_CHAN_A)
                col[3] = fac[0]*col[3] + (facm*in[3]);
        
        QUATCOPY(out, col);
}

static void node_composit_exec_invert(void *UNUSED(data), bNode *node, bNodeStack **in, bNodeStack **out)
{
        /* stack order in: fac, Image, Image */
        /* stack order out: Image */
        float *fac= in[0]->vec;
        
        if(out[0]->hasoutput==0) return;
        
        /* input no image? then only color operation */
        if(in[1]->data==NULL && in[0]->data==NULL) {
                do_invert_fac(node, out[0]->vec, in[1]->vec, fac);
        }
        else {
                /* make output size of first available input image, or then size of fac */
                CompBuf *cbuf= in[1]->data?in[1]->data:in[0]->data;

                /* if neither RGB or A toggled on, pass through */
                if (node->custom1 != 0) {
                        CompBuf *stackbuf= alloc_compbuf(cbuf->x, cbuf->y, CB_RGBA, 1); /* allocs */
                        
                        if (fac[0] < 1.0f || in[0]->data!=NULL)
                                composit2_pixel_processor(node, stackbuf, in[1]->data, in[1]->vec, in[0]->data, fac, do_invert_fac, CB_RGBA, CB_VAL);
                        else
                                composit1_pixel_processor(node, stackbuf, in[1]->data, in[1]->vec, do_invert, CB_RGBA);
                        out[0]->data= stackbuf;
                        return;
                        
                } else {
                        out[0]->data = pass_on_compbuf(cbuf);
                        return;
                }
        }
}

static void node_composit_init_invert(bNode *node)
{
        node->custom1 |= CMP_CHAN_RGB;
}

/* custom1 = mix type */
void register_node_type_cmp_invert(ListBase *lb)
{
        static bNodeType ntype;

        node_type_base(&ntype, CMP_NODE_INVERT, "Invert", NODE_CLASS_OP_COLOR, NODE_OPTIONS,
                cmp_node_invert_in, cmp_node_invert_out);
        node_type_size(&ntype, 120, 120, 140);
        node_type_init(&ntype, node_composit_init_invert);
        node_type_exec(&ntype, node_composit_exec_invert);

        nodeRegisterType(lb, &ntype);
}