CMP_bilateralblur.c

Go to the documentation of this file.

/*
 *
 *
 * ***** 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): Vilem Novak
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "../CMP_util.h"

/* **************** BILATERALBLUR ******************** */
static bNodeSocketType cmp_node_bilateralblur_in[]= {
        { SOCK_RGBA, 1, "Image", 0.8f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f}, 
        { SOCK_RGBA, 1, "Determinator", 0.8f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f}, 
        { -1, 0, "" } 
};

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

#define INIT_C3\
        mean0 = 1; mean1[0] = src[0];mean1[1] = src[1];mean1[2] = src[2];mean1[3] = src[3];

/* finds color distances */
#define COLOR_DISTANCE_C3(c1, c2)\
        ((c1[0] - c2[0])*(c1[0] - c2[0]) + \
        (c1[1] - c2[1])*(c1[1] - c2[1]) + \
        (c1[2] - c2[2])*(c1[2] - c2[2]) + \
        (c1[3] - c2[3])*(c1[3] - c2[3]))

/* this is the main kernel function for comparing color distances
 and adding them weighted to the final color */
#define KERNEL_ELEMENT_C3(k)\
        temp_color = src + deltas[k];\
        ref_color = ref + deltas[k];\
        w = weight_tab[k] + COLOR_DISTANCE_C3(ref, ref_color )*i2sigma_color;\
        w = 1./(w*w + 1); \
        mean0 += w;\
        mean1[0] += temp_color[0]*w; \
        mean1[1] += temp_color[1]*w; \
        mean1[2] += temp_color[2]*w; \
        mean1[3] += temp_color[3]*w;

/* write blurred values to image */
#define UPDATE_OUTPUT_C3\
        mean0 = 1./mean0;\
        dest[x*pix + 0] = mean1[0]*mean0; \
        dest[x*pix + 1] = mean1[1]*mean0; \
        dest[x*pix + 2] = mean1[2]*mean0; \
        dest[x*pix + 3] = mean1[3]*mean0;

/* initializes deltas for fast access to neighbour pixels */
#define INIT_3X3_DELTAS( deltas, step, nch )            \
        ((deltas)[0] =  (nch),  (deltas)[1] = -(step) + (nch),  \
        (deltas)[2] = -(step), (deltas)[3] = -(step) - (nch),  \
        (deltas)[4] = -(nch),  (deltas)[5] =  (step) - (nch),  \
        (deltas)[6] =  (step), (deltas)[7] =  (step) + (nch));


/* code of this node was heavily inspired by the smooth function of opencv library.
The main change is an optional image input */
static void node_composit_exec_bilateralblur(void *UNUSED(data), bNode *node, bNodeStack **in, bNodeStack **out)
{
        NodeBilateralBlurData *nbbd= node->storage;
        CompBuf *new, *source, *img= in[0]->data , *refimg= in[1]->data;
        double mean0, w, i2sigma_color, i2sigma_space;
        double mean1[4];
        double weight_tab[8];
        float *src, *dest, *ref, *temp_color, *ref_color;
        float sigma_color, sigma_space;
        int imgx, imgy, x, y, pix, i, step;
        int deltas[8];
        short found_determinator= 0;

        if(img == NULL || out[0]->hasoutput == 0)
                return;

        if(img->type != CB_RGBA) {
                img= typecheck_compbuf(in[0]->data, CB_RGBA);
        }

        imgx= img->x;
        imgy= img->y;
        pix= img->type;
        step= pix * imgx;

        if(refimg) {
                if(refimg->x == imgx && refimg->y == imgy) {
                        if(ELEM3(refimg->type, CB_VAL, CB_VEC2, CB_VEC3)) {
                                refimg= typecheck_compbuf(in[1]->data, CB_RGBA);
                                found_determinator= 1;
                        }
                }
        }
        else {
                refimg= img;
        }

        /* allocs */
        source= dupalloc_compbuf(img);
        new= alloc_compbuf(imgx, imgy, pix, 1);
        
        /* accept image offsets from other nodes */
        new->xof= img->xof;
        new->yof= img->yof;

        /* bilateral code properties */
        sigma_color= nbbd->sigma_color;
        sigma_space= nbbd->sigma_space;
        
        i2sigma_color= 1. / (sigma_color * sigma_color);
        i2sigma_space= 1. / (sigma_space * sigma_space);

        INIT_3X3_DELTAS(deltas, step, pix);

        weight_tab[0] = weight_tab[2] = weight_tab[4] = weight_tab[6] = i2sigma_space;
        weight_tab[1] = weight_tab[3] = weight_tab[5] = weight_tab[7] = i2sigma_space * 2;

        /* iterations */
        for(i= 0; i < nbbd->iter; i++) {
                src= source->rect;
                ref= refimg->rect;
                dest= new->rect;
                /*goes through image, there are more loops for 1st/last line and all other lines*/
                /*kernel element accumulates surrounding colors, which are then written with the update_output function*/
                for(x= 0; x < imgx; x++, src+= pix, ref+= pix) {
                        INIT_C3;

                        KERNEL_ELEMENT_C3(6);

                        if(x > 0) {
                                KERNEL_ELEMENT_C3(5);
                                KERNEL_ELEMENT_C3(4);
                        }

                        if(x < imgx - 1) {
                                KERNEL_ELEMENT_C3(7);
                                KERNEL_ELEMENT_C3(0);
                        }

                        UPDATE_OUTPUT_C3;
                }

                dest+= step;

                for(y= 1; y < imgy - 1; y++, dest+= step, src+= pix, ref+= pix) {
                        x= 0;

                        INIT_C3;

                        KERNEL_ELEMENT_C3(0);
                        KERNEL_ELEMENT_C3(1);
                        KERNEL_ELEMENT_C3(2);
                        KERNEL_ELEMENT_C3(6);
                        KERNEL_ELEMENT_C3(7);

                        UPDATE_OUTPUT_C3;

                        src+= pix;
                        ref+= pix;

                        for(x= 1; x < imgx - 1; x++, src+= pix, ref+= pix) {
                                INIT_C3;

                                KERNEL_ELEMENT_C3(0);
                                KERNEL_ELEMENT_C3(1);
                                KERNEL_ELEMENT_C3(2);
                                KERNEL_ELEMENT_C3(3);
                                KERNEL_ELEMENT_C3(4);
                                KERNEL_ELEMENT_C3(5);
                                KERNEL_ELEMENT_C3(6);
                                KERNEL_ELEMENT_C3(7);

                                UPDATE_OUTPUT_C3;
                        }

                        INIT_C3;

                        KERNEL_ELEMENT_C3(2);
                        KERNEL_ELEMENT_C3(3);
                        KERNEL_ELEMENT_C3(4);
                        KERNEL_ELEMENT_C3(5);
                        KERNEL_ELEMENT_C3(6);

                        UPDATE_OUTPUT_C3;
                }

                for(x= 0; x < imgx; x++, src+= pix, ref+= pix) {
                        INIT_C3;

                        KERNEL_ELEMENT_C3(2);

                        if(x > 0) {
                                KERNEL_ELEMENT_C3(3);
                                KERNEL_ELEMENT_C3(4);
                        }
                        if(x < imgx - 1) {
                                KERNEL_ELEMENT_C3(1);
                                KERNEL_ELEMENT_C3(0);
                        }

                        UPDATE_OUTPUT_C3;
                }

                if(node->exec & NODE_BREAK) break;

                SWAP(CompBuf, *source, *new);
        }

        if(img != in[0]->data)
                free_compbuf(img);

        if(found_determinator == 1) {
                if(refimg != in[1]->data)
                        free_compbuf(refimg);
        }

        out[0]->data= source;

        free_compbuf(new);
}

static void node_composit_init_bilateralblur(bNode* node)
{
        NodeBilateralBlurData *nbbd= MEM_callocN(sizeof(NodeBilateralBlurData), "node bilateral blur data");
        node->storage= nbbd;
        nbbd->sigma_color= 0.3;
        nbbd->sigma_space= 5.0;
}

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

        node_type_base(&ntype, CMP_NODE_BILATERALBLUR, "Bilateral Blur", NODE_CLASS_OP_FILTER, NODE_OPTIONS,
                cmp_node_bilateralblur_in, cmp_node_bilateralblur_out);
        node_type_size(&ntype, 150, 120, 200);
        node_type_init(&ntype, node_composit_init_bilateralblur);
        node_type_storage(&ntype, "NodeBilateralBlurData", node_free_standard_storage, node_copy_standard_storage);
        node_type_exec(&ntype, node_composit_exec_bilateralblur);

        nodeRegisterType(lb, &ntype);
}