node_composite_invert.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"

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

static bNodeSocketTemplate cmp_node_invert_out[]= { 
    { SOCK_RGBA, 0, "Color"}, 
    { -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
        copy_v3_v3(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 = 1.0f - 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]);
    
    copy_v4_v4(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(bNodeTree *UNUSED(ntree), bNode* node, bNodeTemplate *UNUSED(ntemp))
{
    node->custom1 |= CMP_CHAN_RGB;
}

/* custom1 = mix type */
void register_node_type_cmp_invert(bNodeTreeType *ttype)
{
    static bNodeType ntype;

    node_type_base(ttype, &ntype, CMP_NODE_INVERT, "Invert", NODE_CLASS_OP_COLOR, NODE_OPTIONS);
    node_type_socket_templates(&ntype, 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(ttype, &ntype);
}