CMP_util.c

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/*
 * $Id: CMP_util.c 38344 2011-07-12 18:59:54Z jbakker $
 *
 * ***** 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"

CompBuf *alloc_compbuf(int sizex, int sizey, int type, int alloc)
{
        CompBuf *cbuf= MEM_callocN(sizeof(CompBuf), "compbuf");
        
        cbuf->x= sizex;
        cbuf->y= sizey;
        cbuf->xrad= sizex/2;
        cbuf->yrad= sizey/2;
        
        cbuf->type= type;
        if(alloc) {
                if(cbuf->type==CB_RGBA)
                        cbuf->rect= MEM_mapallocN(4*sizeof(float)*sizex*sizey, "compbuf RGBA rect");
                else if(cbuf->type==CB_VEC3)
                        cbuf->rect= MEM_mapallocN(3*sizeof(float)*sizex*sizey, "compbuf Vector3 rect");
                else if(cbuf->type==CB_VEC2)
                        cbuf->rect= MEM_mapallocN(2*sizeof(float)*sizex*sizey, "compbuf Vector2 rect");
                else
                        cbuf->rect= MEM_mapallocN(sizeof(float)*sizex*sizey, "compbuf Fac rect");
                cbuf->malloc= 1;
        }
        cbuf->disprect.xmin= 0;
        cbuf->disprect.ymin= 0;
        cbuf->disprect.xmax= sizex;
        cbuf->disprect.ymax= sizey;
        
        return cbuf;
}

CompBuf *dupalloc_compbuf(CompBuf *cbuf)
{
        CompBuf *dupbuf= alloc_compbuf(cbuf->x, cbuf->y, cbuf->type, 1);
        if(dupbuf) {
                memmove(dupbuf->rect, cbuf->rect, cbuf->type*sizeof(float)*cbuf->x*cbuf->y);
        
                dupbuf->xof= cbuf->xof;
                dupbuf->yof= cbuf->yof;
        }       
        return dupbuf;
}

/* instead of reference counting, we create a list */
CompBuf *pass_on_compbuf(CompBuf *cbuf)
{
        CompBuf *dupbuf= (cbuf)? alloc_compbuf(cbuf->x, cbuf->y, cbuf->type, 0): NULL;
        CompBuf *lastbuf;
        
        if(dupbuf) {
                dupbuf->rect= cbuf->rect;
                dupbuf->xof= cbuf->xof;
                dupbuf->yof= cbuf->yof;
                dupbuf->malloc= 0;
                
                /* get last buffer in list, and append dupbuf */
                for(lastbuf= cbuf; lastbuf; lastbuf= lastbuf->next)
                        if(lastbuf->next==NULL)
                                break;
                lastbuf->next= dupbuf;
                dupbuf->prev= lastbuf;
        }       
        return dupbuf;
}


void free_compbuf(CompBuf *cbuf)
{
        /* check referencing, then remove from list and set malloc tag */
        if(cbuf->prev || cbuf->next) {
                if(cbuf->prev)
                        cbuf->prev->next= cbuf->next;
                if(cbuf->next)
                        cbuf->next->prev= cbuf->prev;
                if(cbuf->malloc) {
                        if(cbuf->prev)
                                cbuf->prev->malloc= 1;
                        else
                                cbuf->next->malloc= 1;
                        cbuf->malloc= 0;
                }
        }
        
        if(cbuf->malloc && cbuf->rect)
                MEM_freeN(cbuf->rect);

        MEM_freeN(cbuf);
}

void print_compbuf(char *str, CompBuf *cbuf)
{
        printf("Compbuf %s %d %d %p\n", str, cbuf->x, cbuf->y, (void *)cbuf->rect);
        
}

void compbuf_set_node(CompBuf *cbuf, bNode *node)
{
        if (cbuf) cbuf->node = node;
}

/* used for disabling node  (similar code in node_draw.c for disable line and node_edit for untangling nodes) */
void node_compo_pass_on(bNode *node, bNodeStack **nsin, bNodeStack **nsout)
{
        CompBuf *valbuf= NULL, *colbuf= NULL, *vecbuf= NULL;
        bNodeSocket *sock;
        int a;
        
        /* connect the first value buffer in with first value out */
        /* connect the first RGBA buffer in with first RGBA out */
        
        /* test the inputs */
        for(a=0, sock= node->inputs.first; sock; sock= sock->next, a++) {
                if(nsin[a]->data) {
                        CompBuf *cbuf= nsin[a]->data;
                        if(cbuf->type==1 && valbuf==NULL) valbuf= cbuf;
                        if(cbuf->type==3 && vecbuf==NULL) vecbuf= cbuf;
                        if(cbuf->type==4 && colbuf==NULL) colbuf= cbuf;
                }
        }
        
        /* outputs */
        if(valbuf || colbuf || vecbuf) {
                for(a=0, sock= node->outputs.first; sock; sock= sock->next, a++) {
                        if(nsout[a]->hasoutput) {
                                if(sock->type==SOCK_VALUE && valbuf) {
                                        nsout[a]->data= pass_on_compbuf(valbuf);
                                        valbuf= NULL;
                                }
                                if(sock->type==SOCK_VECTOR && vecbuf) {
                                        nsout[a]->data= pass_on_compbuf(vecbuf);
                                        vecbuf= NULL;
                                }
                                if(sock->type==SOCK_RGBA && colbuf) {
                                        nsout[a]->data= pass_on_compbuf(colbuf);
                                        colbuf= NULL;
                                }
                        }
                }
        }
}


CompBuf *get_cropped_compbuf(rcti *drect, float *rectf, int rectx, int recty, int type)
{
        CompBuf *cbuf;
        rcti disprect= *drect;
        float *outfp;
        int dx, y;
        
        if(disprect.xmax>rectx) disprect.xmax= rectx;
        if(disprect.ymax>recty) disprect.ymax= recty;
        if(disprect.xmin>= disprect.xmax) return NULL;
        if(disprect.ymin>= disprect.ymax) return NULL;
        
        cbuf= alloc_compbuf(disprect.xmax-disprect.xmin, disprect.ymax-disprect.ymin, type, 1);
        outfp= cbuf->rect;
        rectf += type*(disprect.ymin*rectx + disprect.xmin);
        dx= type*cbuf->x;
        for(y=cbuf->y; y>0; y--, outfp+=dx, rectf+=type*rectx)
                memcpy(outfp, rectf, sizeof(float)*dx);
        
        return cbuf;
}

CompBuf *scalefast_compbuf(CompBuf *inbuf, int newx, int newy)
{
        CompBuf *outbuf; 
        float *rectf, *newrectf, *rf;
        int x, y, c, pixsize= inbuf->type;
        int ofsx, ofsy, stepx, stepy;
        
        if(inbuf->x==newx && inbuf->y==newy)
                return dupalloc_compbuf(inbuf);
        
        outbuf= alloc_compbuf(newx, newy, inbuf->type, 1);
        newrectf= outbuf->rect;
        
        stepx = (65536.0 * (inbuf->x - 1.0) / (newx - 1.0)) + 0.5;
        stepy = (65536.0 * (inbuf->y - 1.0) / (newy - 1.0)) + 0.5;
        ofsy = 32768;
        
        for (y = newy; y > 0 ; y--){
                rectf = inbuf->rect;
                rectf += pixsize * (ofsy >> 16) * inbuf->x;

                ofsy += stepy;
                ofsx = 32768;
                
                for (x = newx ; x>0 ; x--) {
                        
                        rf= rectf + pixsize*(ofsx >> 16);
                        for(c=0; c<pixsize; c++)
                                newrectf[c] = rf[c];
                        
                        newrectf+= pixsize;
                        
                        ofsx += stepx;
                }
        }
        
        return outbuf;
}

void typecheck_compbuf_color(float *out, float *in, int outtype, int intype)
{
        if(intype == outtype) {
                memcpy(out, in, sizeof(float)*outtype);
        }
        else if(outtype==CB_VAL) {
                if(intype==CB_VEC2) {
                        *out= 0.5f*(in[0]+in[1]);
                }
                else if(intype==CB_VEC3) {
                        *out= 0.333333f*(in[0]+in[1]+in[2]);
                }
                else if(intype==CB_RGBA) {
                        *out= in[0]*0.35f + in[1]*0.45f + in[2]*0.2f;
                }
        }
        else if(outtype==CB_VEC2) {
                if(intype==CB_VAL) {
                        out[0]= in[0];
                        out[1]= in[0];
                }
                else if(intype==CB_VEC3) {
                        out[0]= in[0];
                        out[1]= in[1];
                }
                else if(intype==CB_RGBA) {
                        out[0]= in[0];
                        out[1]= in[1];
                }
        }
        else if(outtype==CB_VEC3) {
                if(intype==CB_VAL) {
                        out[0]= in[0];
                        out[1]= in[0];
                        out[2]= in[0];
                }
                else if(intype==CB_VEC2) {
                        out[0]= in[0];
                        out[1]= in[1];
                        out[2]= 0.0f;
                }
                else if(intype==CB_RGBA) {
                        out[0]= in[0];
                        out[1]= in[1];
                        out[2]= in[2];
                }
        }
        else if(outtype==CB_RGBA) {
                if(intype==CB_VAL) {
                        out[0]= in[0];
                        out[1]= in[0];
                        out[2]= in[0];
                        out[3]= 1.0f;
                }
                else if(intype==CB_VEC2) {
                        out[0]= in[0];
                        out[1]= in[1];
                        out[2]= 0.0f;
                        out[3]= 1.0f;
                }
                else if(intype==CB_VEC3) {
                        out[0]= in[0];
                        out[1]= in[1];
                        out[2]= in[2];
                        out[3]= 1.0f;
                }
        }
}

CompBuf *typecheck_compbuf(CompBuf *inbuf, int type)
{
        if(inbuf && inbuf->type!=type) {
                CompBuf *outbuf;
                float *inrf, *outrf;
                int x;

                outbuf= alloc_compbuf(inbuf->x, inbuf->y, type, 1); 

                /* warning note: xof and yof are applied in pixelprocessor, but should be copied otherwise? */
                outbuf->xof= inbuf->xof;
                outbuf->yof= inbuf->yof;

                if(inbuf->rect_procedural) {
                        outbuf->rect_procedural= inbuf->rect_procedural;
                        VECCOPY(outbuf->procedural_size, inbuf->procedural_size);
                        VECCOPY(outbuf->procedural_offset, inbuf->procedural_offset);
                        outbuf->procedural_type= inbuf->procedural_type;
                        outbuf->node= inbuf->node;
                        return outbuf;
                }

                inrf= inbuf->rect;
                outrf= outbuf->rect;
                x= inbuf->x*inbuf->y;
                
                if(type==CB_VAL) {
                        if(inbuf->type==CB_VEC2) {
                                for(; x>0; x--, outrf+= 1, inrf+= 2)
                                        *outrf= 0.5f*(inrf[0]+inrf[1]);
                        }
                        else if(inbuf->type==CB_VEC3) {
                                for(; x>0; x--, outrf+= 1, inrf+= 3)
                                        *outrf= 0.333333f*(inrf[0]+inrf[1]+inrf[2]);
                        }
                        else if(inbuf->type==CB_RGBA) {
                                for(; x>0; x--, outrf+= 1, inrf+= 4)
                                        *outrf= inrf[0]*0.35f + inrf[1]*0.45f + inrf[2]*0.2f;
                        }
                }
                else if(type==CB_VEC2) {
                        if(inbuf->type==CB_VAL) {
                                for(; x>0; x--, outrf+= 2, inrf+= 1) {
                                        outrf[0]= inrf[0];
                                        outrf[1]= inrf[0];
                                }
                        }
                        else if(inbuf->type==CB_VEC3) {
                                for(; x>0; x--, outrf+= 2, inrf+= 3) {
                                        outrf[0]= inrf[0];
                                        outrf[1]= inrf[1];
                                }
                        }
                        else if(inbuf->type==CB_RGBA) {
                                for(; x>0; x--, outrf+= 2, inrf+= 4) {
                                        outrf[0]= inrf[0];
                                        outrf[1]= inrf[1];
                                }
                        }
                }
                else if(type==CB_VEC3) {
                        if(inbuf->type==CB_VAL) {
                                for(; x>0; x--, outrf+= 3, inrf+= 1) {
                                        outrf[0]= inrf[0];
                                        outrf[1]= inrf[0];
                                        outrf[2]= inrf[0];
                                }
                        }
                        else if(inbuf->type==CB_VEC2) {
                                for(; x>0; x--, outrf+= 3, inrf+= 2) {
                                        outrf[0]= inrf[0];
                                        outrf[1]= inrf[1];
                                        outrf[2]= 0.0f;
                                }
                        }
                        else if(inbuf->type==CB_RGBA) {
                                for(; x>0; x--, outrf+= 3, inrf+= 4) {
                                        outrf[0]= inrf[0];
                                        outrf[1]= inrf[1];
                                        outrf[2]= inrf[2];
                                }
                        }
                }
                else if(type==CB_RGBA) {
                        if(inbuf->type==CB_VAL) {
                                for(; x>0; x--, outrf+= 4, inrf+= 1) {
                                        outrf[0]= inrf[0];
                                        outrf[1]= inrf[0];
                                        outrf[2]= inrf[0];
                                        outrf[3]= 1.0f;
                                }
                        }
                        else if(inbuf->type==CB_VEC2) {
                                for(; x>0; x--, outrf+= 4, inrf+= 2) {
                                        outrf[0]= inrf[0];
                                        outrf[1]= inrf[1];
                                        outrf[2]= 0.0f;
                                        outrf[3]= 1.0f;
                                }
                        }
                        else if(inbuf->type==CB_VEC3) {
                                for(; x>0; x--, outrf+= 4, inrf+= 3) {
                                        outrf[0]= inrf[0];
                                        outrf[1]= inrf[1];
                                        outrf[2]= inrf[2];
                                        outrf[3]= 1.0f;
                                }
                        }
                }
                
                return outbuf;
        }
        return inbuf;
}

static float *compbuf_get_pixel(CompBuf *cbuf, float *defcol, float *use, int x, int y, int xrad, int yrad)
{
        if(cbuf) {
                if(cbuf->rect_procedural) {
                        cbuf->rect_procedural(cbuf, use, (float)x/(float)xrad, (float)y/(float)yrad);
                        return use;
                }
                else {
                        static float col[4]= {0.0f, 0.0f, 0.0f, 0.0f};
                        
                        /* map coords */
                        x-= cbuf->xof;
                        y-= cbuf->yof;
                        
                        if(y<-cbuf->yrad || y>= -cbuf->yrad+cbuf->y) return col;
                        if(x<-cbuf->xrad || x>= -cbuf->xrad+cbuf->x) return col;
                        
                        return cbuf->rect + cbuf->type*( (cbuf->yrad+y)*cbuf->x + (cbuf->xrad+x) );
                }
        }
        else return defcol;
}

/* **************************************************** */

/* Pixel-to-Pixel operation, 1 Image in, 1 out */
void composit1_pixel_processor(bNode *node, CompBuf *out, CompBuf *src_buf, float *src_col,
                                                                          void (*func)(bNode *, float *, float *), 
                                                                          int src_type)
{
        CompBuf *src_use;
        float *outfp=out->rect, *srcfp;
        float color[4]; /* local color if compbuf is procedural */
        int xrad, yrad, x, y;
        
        src_use= typecheck_compbuf(src_buf, src_type);
        
        xrad= out->xrad;
        yrad= out->yrad;
        
        for(y= -yrad; y<-yrad+out->y; y++) {
                for(x= -xrad; x<-xrad+out->x; x++, outfp+=out->type) {
                        srcfp= compbuf_get_pixel(src_use, src_col, color, x, y, xrad, yrad);
                        func(node, outfp, srcfp);
                }
        }
        
        if(src_use!=src_buf)
                free_compbuf(src_use);
}

/* Pixel-to-Pixel operation, 2 Images in, 1 out */
void composit2_pixel_processor(bNode *node, CompBuf *out, CompBuf *src_buf, float *src_col,
                                                                          CompBuf *fac_buf, float *fac, void (*func)(bNode *, float *, float *, float *), 
                                                                          int src_type, int fac_type)
{
        CompBuf *src_use, *fac_use;
        float *outfp=out->rect, *srcfp, *facfp;
        float color[4]; /* local color if compbuf is procedural */
        int xrad, yrad, x, y;
        
        src_use= typecheck_compbuf(src_buf, src_type);
        fac_use= typecheck_compbuf(fac_buf, fac_type);

        xrad= out->xrad;
        yrad= out->yrad;
        
        for(y= -yrad; y<-yrad+out->y; y++) {
                for(x= -xrad; x<-xrad+out->x; x++, outfp+=out->type) {
                        srcfp= compbuf_get_pixel(src_use, src_col, color, x, y, xrad, yrad);
                        facfp= compbuf_get_pixel(fac_use, fac, color, x, y, xrad, yrad);
                        
                        func(node, outfp, srcfp, facfp);
                }
        }
        if(src_use!=src_buf)
                free_compbuf(src_use);
        if(fac_use!=fac_buf)
                free_compbuf(fac_use);
}

/* Pixel-to-Pixel operation, 3 Images in, 1 out */
void composit3_pixel_processor(bNode *node, CompBuf *out, CompBuf *src1_buf, float *src1_col, CompBuf *src2_buf, float *src2_col, 
                                                                          CompBuf *fac_buf, float *fac, void (*func)(bNode *, float *, float *, float *, float *), 
                                                                          int src1_type, int src2_type, int fac_type)
{
        CompBuf *src1_use, *src2_use, *fac_use;
        float *outfp=out->rect, *src1fp, *src2fp, *facfp;
        float color[4]; /* local color if compbuf is procedural */
        int xrad, yrad, x, y;
        
        src1_use= typecheck_compbuf(src1_buf, src1_type);
        src2_use= typecheck_compbuf(src2_buf, src2_type);
        fac_use= typecheck_compbuf(fac_buf, fac_type);
        
        xrad= out->xrad;
        yrad= out->yrad;
        
        for(y= -yrad; y<-yrad+out->y; y++) {
                for(x= -xrad; x<-xrad+out->x; x++, outfp+=out->type) {
                        src1fp= compbuf_get_pixel(src1_use, src1_col, color, x, y, xrad, yrad);
                        src2fp= compbuf_get_pixel(src2_use, src2_col, color, x, y, xrad, yrad);
                        facfp= compbuf_get_pixel(fac_use, fac, color, x, y, xrad, yrad);
                        
                        func(node, outfp, src1fp, src2fp, facfp);
                }
        }
        
        if(src1_use!=src1_buf)
                free_compbuf(src1_use);
        if(src2_use!=src2_buf)
                free_compbuf(src2_use);
        if(fac_use!=fac_buf)
                free_compbuf(fac_use);
}

/* Pixel-to-Pixel operation, 4 Images in, 1 out */
void composit4_pixel_processor(bNode *node, CompBuf *out, CompBuf *src1_buf, float *src1_col, CompBuf *fac1_buf, float *fac1, 
                                                                          CompBuf *src2_buf, float *src2_col, CompBuf *fac2_buf, float *fac2, 
                                                                          void (*func)(bNode *, float *, float *, float *, float *, float *), 
                                                                          int src1_type, int fac1_type, int src2_type, int fac2_type)
{
        CompBuf *src1_use, *src2_use, *fac1_use, *fac2_use;
        float *outfp=out->rect, *src1fp, *src2fp, *fac1fp, *fac2fp;
        float color[4]; /* local color if compbuf is procedural */
        int xrad, yrad, x, y;
        
        src1_use= typecheck_compbuf(src1_buf, src1_type);
        src2_use= typecheck_compbuf(src2_buf, src2_type);
        fac1_use= typecheck_compbuf(fac1_buf, fac1_type);
        fac2_use= typecheck_compbuf(fac2_buf, fac2_type);
        
        xrad= out->xrad;
        yrad= out->yrad;
        
        for(y= -yrad; y<-yrad+out->y; y++) {
                for(x= -xrad; x<-xrad+out->x; x++, outfp+=out->type) {
                        src1fp= compbuf_get_pixel(src1_use, src1_col, color, x, y, xrad, yrad);
                        src2fp= compbuf_get_pixel(src2_use, src2_col, color, x, y, xrad, yrad);
                        fac1fp= compbuf_get_pixel(fac1_use, fac1, color, x, y, xrad, yrad);
                        fac2fp= compbuf_get_pixel(fac2_use, fac2, color, x, y, xrad, yrad);
                        
                        func(node, outfp, src1fp, fac1fp, src2fp, fac2fp);
                }
        }
        
        if(src1_use!=src1_buf)
                free_compbuf(src1_use);
        if(src2_use!=src2_buf)
                free_compbuf(src2_use);
        if(fac1_use!=fac1_buf)
                free_compbuf(fac1_use);
        if(fac2_use!=fac2_buf)
                free_compbuf(fac2_use);
}


CompBuf *valbuf_from_rgbabuf(CompBuf *cbuf, int channel)
{
        CompBuf *valbuf= alloc_compbuf(cbuf->x, cbuf->y, CB_VAL, 1);
        float *valf, *rectf;
        int tot;
        
        /* warning note: xof and yof are applied in pixelprocessor, but should be copied otherwise? */
        valbuf->xof= cbuf->xof;
        valbuf->yof= cbuf->yof;
        
        valf= valbuf->rect;

        /* defaults to returning alpha channel */
        if ((channel < CHAN_R) || (channel > CHAN_A)) channel = CHAN_A;

        rectf= cbuf->rect + channel;
        
        for(tot= cbuf->x*cbuf->y; tot>0; tot--, valf++, rectf+=4)
                *valf= *rectf;
        
        return valbuf;
}

static CompBuf *generate_procedural_preview(CompBuf *cbuf, int newx, int newy)
{
        CompBuf *outbuf;
        float *outfp;
        int xrad, yrad, x, y;
        
        outbuf= alloc_compbuf(newx, newy, CB_RGBA, 1);

        outfp= outbuf->rect;
        xrad= outbuf->xrad;
        yrad= outbuf->yrad;
        
        for(y= -yrad; y<-yrad+outbuf->y; y++)
                for(x= -xrad; x<-xrad+outbuf->x; x++, outfp+=outbuf->type)
                        cbuf->rect_procedural(cbuf, outfp, (float)x/(float)xrad, (float)y/(float)yrad);

        return outbuf;
}

void generate_preview(void *data, bNode *node, CompBuf *stackbuf)
{
        RenderData *rd= data;
        bNodePreview *preview= node->preview;
        int xsize, ysize;
        int color_manage= rd->color_mgt_flag & R_COLOR_MANAGEMENT;
        unsigned char *rect;
        
        if(preview && stackbuf) {
                CompBuf *cbuf, *stackbuf_use;
                
                if(stackbuf->rect==NULL && stackbuf->rect_procedural==NULL) return;
                
                stackbuf_use= typecheck_compbuf(stackbuf, CB_RGBA);

                if(stackbuf->x > stackbuf->y) {
                        xsize= 140;
                        ysize= (140*stackbuf->y)/stackbuf->x;
                }
                else {
                        ysize= 140;
                        xsize= (140*stackbuf->x)/stackbuf->y;
                }
                
                if(stackbuf_use->rect_procedural)
                        cbuf= generate_procedural_preview(stackbuf_use, xsize, ysize);
                else
                        cbuf= scalefast_compbuf(stackbuf_use, xsize, ysize);

                /* convert to byte for preview */
                rect= MEM_callocN(sizeof(unsigned char)*4*xsize*ysize, "bNodePreview.rect");

                if(color_manage)
                        floatbuf_to_srgb_byte(cbuf->rect, rect, 0, xsize, 0, ysize, xsize);
                else
                        floatbuf_to_byte(cbuf->rect, rect, 0, xsize, 0, ysize, xsize);
                
                free_compbuf(cbuf);
                if(stackbuf_use!=stackbuf)
                        free_compbuf(stackbuf_use);

                BLI_lock_thread(LOCK_PREVIEW);

                if(preview->rect)
                        MEM_freeN(preview->rect);
                preview->xsize= xsize;
                preview->ysize= ysize;
                preview->rect= rect;

                BLI_unlock_thread(LOCK_PREVIEW);
        }
}

void do_rgba_to_yuva(bNode *UNUSED(node), float *out, float *in)
{
        rgb_to_yuv(in[0],in[1],in[2], &out[0], &out[1], &out[2]);
        out[3]=in[3];
}

void do_rgba_to_hsva(bNode *UNUSED(node), float *out, float *in)
{
        rgb_to_hsv(in[0],in[1],in[2], &out[0], &out[1], &out[2]);
        out[3]=in[3];
}

void do_rgba_to_ycca(bNode *UNUSED(node), float *out, float *in)
{
        rgb_to_ycc(in[0],in[1],in[2], &out[0], &out[1], &out[2], BLI_YCC_ITU_BT601);
        out[3]=in[3];
}

void do_yuva_to_rgba(bNode *UNUSED(node), float *out, float *in)
{
        yuv_to_rgb(in[0],in[1],in[2], &out[0], &out[1], &out[2]);
        out[3]=in[3];
}

void do_hsva_to_rgba(bNode *UNUSED(node), float *out, float *in)
{
        hsv_to_rgb(in[0],in[1],in[2], &out[0], &out[1], &out[2]);
        out[3]=in[3];
}

void do_ycca_to_rgba(bNode *UNUSED(node), float *out, float *in)
{
        ycc_to_rgb(in[0],in[1],in[2], &out[0], &out[1], &out[2], BLI_YCC_ITU_BT601);
        out[3]=in[3];
}

void do_copy_rgba(bNode *UNUSED(node), float *out, float *in)
{
        QUATCOPY(out, in);
}

void do_copy_rgb(bNode *UNUSED(node), float *out, float *in)
{
        VECCOPY(out, in);
        out[3]= 1.0f;
}

void do_copy_value(bNode *UNUSED(node), float *out, float *in)
{
        out[0]= in[0];
}

void do_copy_a_rgba(bNode *UNUSED(node), float *out, float *in, float *fac)
{
        VECCOPY(out, in);
        out[3]= *fac;
}

/* only accepts RGBA buffers */
void gamma_correct_compbuf(CompBuf *img, int inversed)
{
        float *drect;
        int x;

        if(img->type!=CB_RGBA) return;

        drect= img->rect;
        if(inversed) {
                for(x=img->x*img->y; x>0; x--, drect+=4) {
                        if(drect[0]>0.0f) drect[0]= sqrt(drect[0]); else drect[0]= 0.0f;
                        if(drect[1]>0.0f) drect[1]= sqrt(drect[1]); else drect[1]= 0.0f;
                        if(drect[2]>0.0f) drect[2]= sqrt(drect[2]); else drect[2]= 0.0f;
                }
        }
        else {
                for(x=img->x*img->y; x>0; x--, drect+=4) {
                        if(drect[0]>0.0f) drect[0]*= drect[0]; else drect[0]= 0.0f;
                        if(drect[1]>0.0f) drect[1]*= drect[1]; else drect[1]= 0.0f;
                        if(drect[2]>0.0f) drect[2]*= drect[2]; else drect[2]= 0.0f;
                }
        }
}

void premul_compbuf(CompBuf *img, int inversed)
{
        float *drect;
        int x;

        if(img->type!=CB_RGBA) return;

        drect= img->rect;
        if(inversed) {
                for(x=img->x*img->y; x>0; x--, drect+=4) {
                        if(fabs(drect[3]) < 1e-5f) {
                                drect[0]= 0.0f;
                                drect[1]= 0.0f;
                                drect[2]= 0.0f;
                        }
                        else {
                                drect[0] /= drect[3];
                                drect[1] /= drect[3];
                                drect[2] /= drect[3];
                        }
                }
        }
        else {
                for(x=img->x*img->y; x>0; x--, drect+=4) {
                        drect[0] *= drect[3];
                        drect[1] *= drect[3];
                        drect[2] *= drect[3];
                }
        }
}



/*
 *  2D Fast Hartley Transform, used for convolution
 */

typedef float fREAL;

// returns next highest power of 2 of x, as well it's log2 in L2
static unsigned int nextPow2(unsigned int x, unsigned int* L2)
{
        unsigned int pw, x_notpow2 = x & (x-1);
        *L2 = 0;
        while (x>>=1) ++(*L2);
        pw = 1 << (*L2);
        if (x_notpow2) { (*L2)++;  pw<<=1; }
        return pw;
}

//------------------------------------------------------------------------------

// from FXT library by Joerg Arndt, faster in order bitreversal
// use: r = revbin_upd(r, h) where h = N>>1
static unsigned int revbin_upd(unsigned int r, unsigned int h)
{
        while (!((r^=h)&h)) h >>= 1;
        return r;
}
//------------------------------------------------------------------------------
static void FHT(fREAL* data, unsigned int M, unsigned int inverse)
{
        double tt, fc, dc, fs, ds, a = M_PI;
        fREAL t1, t2;
        int n2, bd, bl, istep, k, len = 1 << M, n = 1;

        int i, j = 0;
        unsigned int Nh = len >> 1;
        for (i=1;i<(len-1);++i) {
                j = revbin_upd(j, Nh);
                if (j>i) {
                        t1 = data[i];
                        data[i] = data[j];
                        data[j] = t1;
                }
        }

        do {
                fREAL* data_n = &data[n];

                istep = n << 1;
                for (k=0; k<len; k+=istep) {
                        t1 = data_n[k];
                        data_n[k] = data[k] - t1;
                        data[k] += t1;
                }

                n2 = n >> 1;
                if (n>2) {
                        fc = dc = cos(a);
                        fs = ds = sqrt(1.0 - fc*fc); //sin(a);
                        bd = n-2;
                        for (bl=1; bl<n2; bl++) {
                                fREAL* data_nbd = &data_n[bd];
                                fREAL* data_bd = &data[bd];
                                for (k=bl; k<len; k+=istep) {
                                        t1 = fc*data_n[k] + fs*data_nbd[k];
                                        t2 = fs*data_n[k] - fc*data_nbd[k];
                                        data_n[k] = data[k] - t1;
                                        data_nbd[k] = data_bd[k] - t2;
                                        data[k] += t1;
                                        data_bd[k] += t2;
                                }
                                tt = fc*dc - fs*ds;
                                fs = fs*dc + fc*ds;
                                fc = tt;
                                bd -= 2;
                        }
                }

                if (n>1) {
                        for (k=n2; k<len; k+=istep) {
                                t1 = data_n[k];
                                data_n[k] = data[k] - t1;
                                data[k] += t1;
                        }
                }

                n = istep;
                a *= 0.5;
        } while (n<len);

        if (inverse) {
                fREAL sc = (fREAL)1 / (fREAL)len;
                for (k=0; k<len; ++k)
                        data[k] *= sc;
        }
}
//------------------------------------------------------------------------------
/* 2D Fast Hartley Transform, Mx/My -> log2 of width/height,
        nzp -> the row where zero pad data starts,
        inverse -> see above */
static void FHT2D(fREAL *data, unsigned int Mx, unsigned int My,
                unsigned int nzp, unsigned int inverse)
{
        unsigned int i, j, Nx, Ny, maxy;
        fREAL t;

        Nx = 1 << Mx;
        Ny = 1 << My;

        // rows (forward transform skips 0 pad data)
        maxy = inverse ? Ny : nzp;
        for (j=0; j<maxy; ++j)
                FHT(&data[Nx*j], Mx, inverse);

        // transpose data
        if (Nx==Ny) {  // square
                for (j=0; j<Ny; ++j)
                        for (i=j+1; i<Nx; ++i) {
                                unsigned int op = i + (j << Mx), np = j + (i << My);
                                t=data[op], data[op]=data[np], data[np]=t;
                        }
        }
        else {  // rectangular
                unsigned int k, Nym = Ny-1, stm = 1 << (Mx + My);
                for (i=0; stm>0; i++) {
                        #define pred(k) (((k & Nym) << Mx) + (k >> My))
                        for (j=pred(i); j>i; j=pred(j));
                        if (j < i) continue;
                        for (k=i, j=pred(i); j!=i; k=j, j=pred(j), stm--)
                                { t=data[j], data[j]=data[k], data[k]=t; }
                        #undef pred
                        stm--;
                }
        }
        // swap Mx/My & Nx/Ny
        i = Nx, Nx = Ny, Ny = i;
        i = Mx, Mx = My, My = i;

        // now columns == transposed rows
        for (j=0; j<Ny; ++j)
                FHT(&data[Nx*j], Mx, inverse);

        // finalize
        for (j=0; j<=(Ny >> 1); j++) {
                unsigned int jm = (Ny - j) & (Ny-1);
                unsigned int ji = j << Mx;
                unsigned int jmi = jm << Mx;
                for (i=0; i<=(Nx >> 1); i++) {
                        unsigned int im = (Nx - i) & (Nx-1);
                        fREAL A = data[ji + i];
                        fREAL B = data[jmi + i];
                        fREAL C = data[ji + im];
                        fREAL D = data[jmi + im];
                        fREAL E = (fREAL)0.5*((A + D) - (B + C));
                        data[ji + i] = A - E;
                        data[jmi + i] = B + E;
                        data[ji + im] = C + E;
                        data[jmi + im] = D - E;
                }
        }

}

//------------------------------------------------------------------------------

/* 2D convolution calc, d1 *= d2, M/N - > log2 of width/height */
static void fht_convolve(fREAL* d1, fREAL* d2, unsigned int M, unsigned int N)
{
        fREAL a, b;
        unsigned int i, j, k, L, mj, mL;
        unsigned int m = 1 << M, n = 1 << N;
        unsigned int m2 = 1 << (M-1), n2 = 1 << (N-1);
        unsigned int mn2 = m << (N-1);

        d1[0] *= d2[0];
        d1[mn2] *= d2[mn2];
        d1[m2] *= d2[m2];
        d1[m2 + mn2] *= d2[m2 + mn2];
        for (i=1; i<m2; i++) {
                k = m - i;
                a = d1[i]*d2[i] - d1[k]*d2[k];
                b = d1[k]*d2[i] + d1[i]*d2[k];
                d1[i] = (b + a)*(fREAL)0.5;
                d1[k] = (b - a)*(fREAL)0.5;
                a = d1[i + mn2]*d2[i + mn2] - d1[k + mn2]*d2[k + mn2];
                b = d1[k + mn2]*d2[i + mn2] + d1[i + mn2]*d2[k + mn2];
                d1[i + mn2] = (b + a)*(fREAL)0.5;
                d1[k + mn2] = (b - a)*(fREAL)0.5;
        }
        for (j=1; j<n2; j++) {
                L = n - j;
                mj = j << M;
                mL = L << M;
                a = d1[mj]*d2[mj] - d1[mL]*d2[mL];
                b = d1[mL]*d2[mj] + d1[mj]*d2[mL];
                d1[mj] = (b + a)*(fREAL)0.5;
                d1[mL] = (b - a)*(fREAL)0.5;
                a = d1[m2 + mj]*d2[m2 + mj] - d1[m2 + mL]*d2[m2 + mL];
                b = d1[m2 + mL]*d2[m2 + mj] + d1[m2 + mj]*d2[m2 + mL];
                d1[m2 + mj] = (b + a)*(fREAL)0.5;
                d1[m2 + mL] = (b - a)*(fREAL)0.5;
        }
        for (i=1; i<m2; i++) {
                k = m - i;
                for (j=1; j<n2; j++) {
                        L = n - j;
                        mj = j << M;
                        mL = L << M;
                        a = d1[i + mj]*d2[i + mj] - d1[k + mL]*d2[k + mL];
                        b = d1[k + mL]*d2[i + mj] + d1[i + mj]*d2[k + mL];
                        d1[i + mj] = (b + a)*(fREAL)0.5;
                        d1[k + mL] = (b - a)*(fREAL)0.5;
                        a = d1[i + mL]*d2[i + mL] - d1[k + mj]*d2[k + mj];
                        b = d1[k + mj]*d2[i + mL] + d1[i + mL]*d2[k + mj];
                        d1[i + mL] = (b + a)*(fREAL)0.5;
                        d1[k + mj] = (b - a)*(fREAL)0.5;
                }
        }
}

//------------------------------------------------------------------------------

void convolve(CompBuf* dst, CompBuf* in1, CompBuf* in2)
{
        fREAL *data1, *data2, *fp;
        unsigned int w2, h2, hw, hh, log2_w, log2_h;
        fRGB wt, *colp;
        int x, y, ch;
        int xbl, ybl, nxb, nyb, xbsz, ybsz;
        int in2done = 0;

        CompBuf* rdst = alloc_compbuf(in1->x, in1->y, in1->type, 1);

        // convolution result width & height
        w2 = 2*in2->x - 1;
        h2 = 2*in2->y - 1;
        // FFT pow2 required size & log2
        w2 = nextPow2(w2, &log2_w);
        h2 = nextPow2(h2, &log2_h);

        // alloc space
        data1 = (fREAL*)MEM_callocN(3*w2*h2*sizeof(fREAL), "convolve_fast FHT data1");
        data2 = (fREAL*)MEM_callocN(w2*h2*sizeof(fREAL), "convolve_fast FHT data2");

        // normalize convolutor
        wt[0] = wt[1] = wt[2] = 0.f;
        for (y=0; y<in2->y; y++) {
                colp = (fRGB*)&in2->rect[y*in2->x*in2->type];
                for (x=0; x<in2->x; x++)
                        fRGB_add(wt, colp[x]);
        }
        if (wt[0] != 0.f) wt[0] = 1.f/wt[0];
        if (wt[1] != 0.f) wt[1] = 1.f/wt[1];
        if (wt[2] != 0.f) wt[2] = 1.f/wt[2];
        for (y=0; y<in2->y; y++) {
                colp = (fRGB*)&in2->rect[y*in2->x*in2->type];
                for (x=0; x<in2->x; x++)
                        fRGB_colormult(colp[x], wt);
        }

        // copy image data, unpacking interleaved RGBA into separate channels
        // only need to calc data1 once

        // block add-overlap
        hw = in2->x >> 1;
        hh = in2->y >> 1;
        xbsz = (w2 + 1) - in2->x;
        ybsz = (h2 + 1) - in2->y;
        nxb = in1->x / xbsz;
        if (in1->x % xbsz) nxb++;
        nyb = in1->y / ybsz;
        if (in1->y % ybsz) nyb++;
        for (ybl=0; ybl<nyb; ybl++) {
                for (xbl=0; xbl<nxb; xbl++) {

                        // each channel one by one
                        for (ch=0; ch<3; ch++) {
                                fREAL* data1ch = &data1[ch*w2*h2];

                                // only need to calc fht data from in2 once, can re-use for every block
                                if (!in2done) {
                                        // in2, channel ch -> data1
                                        for (y=0; y<in2->y; y++) {
                                                fp = &data1ch[y*w2];
                                                colp = (fRGB*)&in2->rect[y*in2->x*in2->type];
                                                for (x=0; x<in2->x; x++)
                                                        fp[x] = colp[x][ch];
                                        }
                                }

                                // in1, channel ch -> data2
                                memset(data2, 0, w2*h2*sizeof(fREAL));
                                for (y=0; y<ybsz; y++) {
                                        int yy = ybl*ybsz + y;
                                        if (yy >= in1->y) continue;
                                        fp = &data2[y*w2];
                                        colp = (fRGB*)&in1->rect[yy*in1->x*in1->type];
                                        for (x=0; x<xbsz; x++) {
                                                int xx = xbl*xbsz + x;
                                                if (xx >= in1->x) continue;
                                                fp[x] = colp[xx][ch];
                                        }
                                }

                                // forward FHT
                                // zero pad data start is different for each == height+1
                                if (!in2done) FHT2D(data1ch, log2_w, log2_h, in2->y+1, 0);
                                FHT2D(data2, log2_w, log2_h, in2->y+1, 0);

                                // FHT2D transposed data, row/col now swapped
                                // convolve & inverse FHT
                                fht_convolve(data2, data1ch, log2_h, log2_w);
                                FHT2D(data2, log2_h, log2_w, 0, 1);
                                // data again transposed, so in order again

                                // overlap-add result
                                for (y=0; y<(int)h2; y++) {
                                        const int yy = ybl*ybsz + y - hh;
                                        if ((yy < 0) || (yy >= in1->y)) continue;
                                        fp = &data2[y*w2];
                                        colp = (fRGB*)&rdst->rect[yy*in1->x*in1->type];
                                        for (x=0; x<(int)w2; x++) {
                                                const int xx = xbl*xbsz + x - hw;
                                                if ((xx < 0) || (xx >= in1->x)) continue;
                                                colp[xx][ch] += fp[x];
                                        }
                                }

                        }
                        in2done = 1;
                }
        }

        MEM_freeN(data2);
        MEM_freeN(data1);
        memcpy(dst->rect, rdst->rect, sizeof(float)*dst->x*dst->y*dst->type);
        free_compbuf(rdst);
}


/*
 *
 * Utility functions qd_* should probably be intergrated better with other functions here.
 *
 */
// sets fcol to pixelcolor at (x, y)
void qd_getPixel(CompBuf* src, int x, int y, float* col)
{
        if(src->rect_procedural) {
                float bc[4];
                src->rect_procedural(src, bc, (float)x/(float)src->xrad, (float)y/(float)src->yrad);

                switch(src->type){
                        /* these fallthrough to get all the channels */
                        case CB_RGBA: col[3]=bc[3]; 
                        case CB_VEC3: col[2]=bc[2];
                        case CB_VEC2: col[1]=bc[1];
                        case CB_VAL: col[0]=bc[0];
                }
        }
        else if ((x >= 0) && (x < src->x) && (y >= 0) && (y < src->y)) {
                float* bc = &src->rect[(x + y*src->x)*src->type];
                switch(src->type){
                        /* these fallthrough to get all the channels */
                        case CB_RGBA: col[3]=bc[3]; 
                        case CB_VEC3: col[2]=bc[2];
                        case CB_VEC2: col[1]=bc[1];
                        case CB_VAL: col[0]=bc[0];
                }
        }
        else {
                switch(src->type){
                        /* these fallthrough to get all the channels */
                        case CB_RGBA: col[3]=0.0; 
                        case CB_VEC3: col[2]=0.0; 
                        case CB_VEC2: col[1]=0.0; 
                        case CB_VAL: col[0]=0.0; 
                }
        }
}

// sets pixel (x, y) to color col
void qd_setPixel(CompBuf* src, int x, int y, float* col)
{
        if ((x >= 0) && (x < src->x) && (y >= 0) && (y < src->y)) {
                float* bc = &src->rect[(x + y*src->x)*src->type];
                switch(src->type){
                        /* these fallthrough to get all the channels */
                        case CB_RGBA: bc[3]=col[3]; 
                        case CB_VEC3: bc[2]=col[2];
                        case CB_VEC2: bc[1]=col[1];
                        case CB_VAL: bc[0]=col[0];
                }
        }
}

// adds fcol to pixelcolor (x, y)
void qd_addPixel(CompBuf* src, int x, int y, float* col)
{
        if ((x >= 0) && (x < src->x) && (y >= 0) && (y < src->y)) {
                float* bc = &src->rect[(x + y*src->x)*src->type];
                bc[0] += col[0], bc[1] += col[1], bc[2] += col[2];
        }
}

// multiplies pixel by factor value f
void qd_multPixel(CompBuf* src, int x, int y, float f)
{
        if ((x >= 0) && (x < src->x) && (y >= 0) && (y < src->y)) {
                float* bc = &src->rect[(x + y*src->x)*src->type];
                bc[0] *= f, bc[1] *= f, bc[2] *= f;
        }
}

// bilinear interpolation with wraparound
void qd_getPixelLerpWrap(CompBuf* src, float u, float v, float* col)
{
        const float ufl = floor(u), vfl = floor(v);
        const int nx = (int)ufl % src->x, ny = (int)vfl % src->y;
        const int x1 = (nx < 0) ? (nx + src->x) : nx;
        const int y1 = (ny < 0) ? (ny + src->y) : ny;
        const int x2 = (x1 + 1) % src->x, y2 = (y1 + 1) % src->y;
        const float* c00 = &src->rect[(x1 + y1*src->x)*src->type];
        const float* c10 = &src->rect[(x2 + y1*src->x)*src->type];
        const float* c01 = &src->rect[(x1 + y2*src->x)*src->type];
        const float* c11 = &src->rect[(x2 + y2*src->x)*src->type];
        const float uf = u - ufl, vf = v - vfl;
        const float w00=(1.f-uf)*(1.f-vf), w10=uf*(1.f-vf), w01=(1.f-uf)*vf, w11=uf*vf;
        col[0] = w00*c00[0] + w10*c10[0] + w01*c01[0] + w11*c11[0];
        if (src->type != CB_VAL) {
                col[1] = w00*c00[1] + w10*c10[1] + w01*c01[1] + w11*c11[1];
                col[2] = w00*c00[2] + w10*c10[2] + w01*c01[2] + w11*c11[2];
                col[3] = w00*c00[3] + w10*c10[3] + w01*c01[3] + w11*c11[3];
        }
}

// as above, without wrap around
void qd_getPixelLerp(CompBuf* src, float u, float v, float* col)
{
        const float ufl = floor(u), vfl = floor(v);
        const int x1 = (int)ufl, y1 = (int)vfl;
        const int x2 = (int)ceil(u), y2 = (int)ceil(v);
        if ((x2 >= 0) && (y2 >= 0) && (x1 < src->x) && (y1 < src->y)) {
                const float B[4] = {0,0,0,0};
                const int ox1 = (x1 < 0), oy1 = (y1 < 0), ox2 = (x2 >= src->x), oy2 = (y2 >= src->y);
                const float* c00 = (ox1 || oy1) ? B : &src->rect[(x1 + y1*src->x)*src->type];
                const float* c10 = (ox2 || oy1) ? B : &src->rect[(x2 + y1*src->x)*src->type];
                const float* c01 = (ox1 || oy2) ? B : &src->rect[(x1 + y2*src->x)*src->type];
                const float* c11 = (ox2 || oy2) ? B : &src->rect[(x2 + y2*src->x)*src->type];
                const float uf = u - ufl, vf = v - vfl;
                const float w00=(1.f-uf)*(1.f-vf), w10=uf*(1.f-vf), w01=(1.f-uf)*vf, w11=uf*vf;
                col[0] = w00*c00[0] + w10*c10[0] + w01*c01[0] + w11*c11[0];
                if (src->type != CB_VAL) {
                        col[1] = w00*c00[1] + w10*c10[1] + w01*c01[1] + w11*c11[1];
                        col[2] = w00*c00[2] + w10*c10[2] + w01*c01[2] + w11*c11[2];
                        col[3] = w00*c00[3] + w10*c10[3] + w01*c01[3] + w11*c11[3];
                }
        }
        else col[0] = col[1] = col[2] = col[3] = 0.f;
}

// as above, sampling only one channel
void qd_getPixelLerpChan(CompBuf* src, float u, float v, int chan, float* out)
{
        const float ufl = floor(u), vfl = floor(v);
        const int x1 = (int)ufl, y1 = (int)vfl;
        const int x2 = (int)ceil(u), y2 = (int)ceil(v);
        if (chan >= src->type) chan = 0;
        if ((x2 >= 0) && (y2 >= 0) && (x1 < src->x) && (y1 < src->y)) {
                const float B[4] = {0,0,0,0};
                const int ox1 = (x1 < 0), oy1 = (y1 < 0), ox2 = (x2 >= src->x), oy2 = (y2 >= src->y);
                const float* c00 = (ox1 || oy1) ? B : &src->rect[(x1 + y1*src->x)*src->type + chan];
                const float* c10 = (ox2 || oy1) ? B : &src->rect[(x2 + y1*src->x)*src->type + chan];
                const float* c01 = (ox1 || oy2) ? B : &src->rect[(x1 + y2*src->x)*src->type + chan];
                const float* c11 = (ox2 || oy2) ? B : &src->rect[(x2 + y2*src->x)*src->type + chan];
                const float uf = u - ufl, vf = v - vfl;
                const float w00=(1.f-uf)*(1.f-vf), w10=uf*(1.f-vf), w01=(1.f-uf)*vf, w11=uf*vf;
                out[0] = w00*c00[0] + w10*c10[0] + w01*c01[0] + w11*c11[0];
        }
        else *out = 0.f;
}


CompBuf* qd_downScaledCopy(CompBuf* src, int scale)
{
        CompBuf* fbuf;
        if (scale <= 1)
                fbuf = dupalloc_compbuf(src);
        else {
                int nw = src->x/scale, nh = src->y/scale;
                if ((2*(src->x % scale)) > scale) nw++;
                if ((2*(src->y % scale)) > scale) nh++;
                fbuf = alloc_compbuf(nw, nh, src->type, 1);
                {
                        int x, y, xx, yy, sx, sy, mx, my;
                        float colsum[4] = {0.0f, 0.0f, 0.0f, 0.0f};
                        float fscale = 1.f/(float)(scale*scale);
                        for (y=0; y<nh; y++) {
                                fRGB* fcolp = (fRGB*)&fbuf->rect[y*fbuf->x*fbuf->type];
                                yy = y*scale;
                                my = yy + scale;
                                if (my > src->y) my = src->y;
                                for (x=0; x<nw; x++) {
                                        xx = x*scale;
                                        mx = xx + scale;
                                        if (mx > src->x) mx = src->x;
                                        colsum[0] = colsum[1] = colsum[2] = 0.f;
                                        for (sy=yy; sy<my; sy++) {
                                                fRGB* scolp = (fRGB*)&src->rect[sy*src->x*src->type];
                                                for (sx=xx; sx<mx; sx++)
                                                        fRGB_add(colsum, scolp[sx]);
                                        }
                                        fRGB_mult(colsum, fscale);
                                        fRGB_copy(fcolp[x], colsum);
                                }
                        }
                }
        }
        return fbuf;
}

// fast g.blur, per channel
// xy var. bits 1 & 2 ca be used to blur in x or y direction separately
void IIR_gauss(CompBuf* src, float sigma, int chan, int xy)
{
        double q, q2, sc, cf[4], tsM[9], tsu[3], tsv[3];
        double *X, *Y, *W;
        int i, x, y, sz;

        // <0.5 not valid, though can have a possibly useful sort of sharpening effect
        if (sigma < 0.5) return;
        
        if ((xy < 1) || (xy > 3)) xy = 3;
        
        // XXX The YVV macro defined below explicitely expects sources of at least 3x3 pixels,
        //     so just skiping blur along faulty direction if src's def is below that limit!
        if (src->x < 3) xy &= ~(int) 1;
        if (src->y < 3) xy &= ~(int) 2;
        if (xy < 1) return;
        
        // see "Recursive Gabor Filtering" by Young/VanVliet
        // all factors here in double.prec. Required, because for single.prec it seems to blow up if sigma > ~200
        if (sigma >= 3.556)
                q = 0.9804*(sigma - 3.556) + 2.5091;
        else // sigma >= 0.5
                q = (0.0561*sigma + 0.5784)*sigma - 0.2568;
        q2 = q*q;
        sc = (1.1668 + q)*(3.203729649  + (2.21566 + q)*q);
        // no gabor filtering here, so no complex multiplies, just the regular coefs.
        // all negated here, so as not to have to recalc Triggs/Sdika matrix
        cf[1] = q*(5.788961737 + (6.76492 + 3.0*q)*q)/ sc;
        cf[2] = -q2*(3.38246 + 3.0*q)/sc;
        // 0 & 3 unchanged
        cf[3] = q2*q/sc;
        cf[0] = 1.0 - cf[1] - cf[2] - cf[3];

        // Triggs/Sdika border corrections,
        // it seems to work, not entirely sure if it is actually totally correct,
        // Besides J.M.Geusebroek's anigauss.c (see http://www.science.uva.nl/~mark),
        // found one other implementation by Cristoph Lampert,
        // but neither seem to be quite the same, result seems to be ok sofar anyway.
        // Extra scale factor here to not have to do it in filter,
        // though maybe this had something to with the precision errors
        sc = cf[0]/((1.0 + cf[1] - cf[2] + cf[3])*(1.0 - cf[1] - cf[2] - cf[3])*(1.0 + cf[2] + (cf[1] - cf[3])*cf[3]));
        tsM[0] = sc*(-cf[3]*cf[1] + 1.0 - cf[3]*cf[3] - cf[2]);
        tsM[1] = sc*((cf[3] + cf[1])*(cf[2] + cf[3]*cf[1]));
        tsM[2] = sc*(cf[3]*(cf[1] + cf[3]*cf[2]));
        tsM[3] = sc*(cf[1] + cf[3]*cf[2]);
        tsM[4] = sc*(-(cf[2] - 1.0)*(cf[2] + cf[3]*cf[1]));
        tsM[5] = sc*(-(cf[3]*cf[1] + cf[3]*cf[3] + cf[2] - 1.0)*cf[3]);
        tsM[6] = sc*(cf[3]*cf[1] + cf[2] + cf[1]*cf[1] - cf[2]*cf[2]);
        tsM[7] = sc*(cf[1]*cf[2] + cf[3]*cf[2]*cf[2] - cf[1]*cf[3]*cf[3] - cf[3]*cf[3]*cf[3] - cf[3]*cf[2] + cf[3]);
        tsM[8] = sc*(cf[3]*(cf[1] + cf[3]*cf[2]));

#define YVV(L)\
{\
        W[0] = cf[0]*X[0] + cf[1]*X[0] + cf[2]*X[0] + cf[3]*X[0];\
        W[1] = cf[0]*X[1] + cf[1]*W[0] + cf[2]*X[0] + cf[3]*X[0];\
        W[2] = cf[0]*X[2] + cf[1]*W[1] + cf[2]*W[0] + cf[3]*X[0];\
        for (i=3; i<L; i++)\
                W[i] = cf[0]*X[i] + cf[1]*W[i-1] + cf[2]*W[i-2] + cf[3]*W[i-3];\
        tsu[0] = W[L-1] - X[L-1];\
        tsu[1] = W[L-2] - X[L-1];\
        tsu[2] = W[L-3] - X[L-1];\
        tsv[0] = tsM[0]*tsu[0] + tsM[1]*tsu[1] + tsM[2]*tsu[2] + X[L-1];\
        tsv[1] = tsM[3]*tsu[0] + tsM[4]*tsu[1] + tsM[5]*tsu[2] + X[L-1];\
        tsv[2] = tsM[6]*tsu[0] + tsM[7]*tsu[1] + tsM[8]*tsu[2] + X[L-1];\
        Y[L-1] = cf[0]*W[L-1] + cf[1]*tsv[0] + cf[2]*tsv[1] + cf[3]*tsv[2];\
        Y[L-2] = cf[0]*W[L-2] + cf[1]*Y[L-1] + cf[2]*tsv[0] + cf[3]*tsv[1];\
        Y[L-3] = cf[0]*W[L-3] + cf[1]*Y[L-2] + cf[2]*Y[L-1] + cf[3]*tsv[0];\
        for (i=L-4; i>=0; i--)\
                Y[i] = cf[0]*W[i] + cf[1]*Y[i+1] + cf[2]*Y[i+2] + cf[3]*Y[i+3];\
}

        // intermediate buffers
        sz = MAX2(src->x, src->y);
        X = MEM_callocN(sz*sizeof(double), "IIR_gauss X buf");
        Y = MEM_callocN(sz*sizeof(double), "IIR_gauss Y buf");
        W = MEM_callocN(sz*sizeof(double), "IIR_gauss W buf");
        if (xy & 1) {   // H
                for (y=0; y<src->y; ++y) {
                        const int yx = y*src->x;
                        for (x=0; x<src->x; ++x)
                                X[x] = src->rect[(x + yx)*src->type + chan];
                        YVV(src->x);
                        for (x=0; x<src->x; ++x)
                                src->rect[(x + yx)*src->type + chan] = Y[x];
                }
        }
        if (xy & 2) {   // V
                for (x=0; x<src->x; ++x) {
                        for (y=0; y<src->y; ++y)
                                X[y] = src->rect[(x + y*src->x)*src->type + chan];
                        YVV(src->y);
                        for (y=0; y<src->y; ++y)
                                src->rect[(x + y*src->x)*src->type + chan] = Y[y];
                }
        }

        MEM_freeN(X);
        MEM_freeN(W);
        MEM_freeN(Y);
#undef YVV
}