Logo Search packages:      
Sourcecode: blender version File versions

image.c

/*  image.c        
 * 
 * $Id: image.c,v 1.13 2004/12/19 18:06:28 phase Exp $
 *
 * ***** BEGIN GPL/BL DUAL 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. The Blender
 * Foundation also sells licenses for use in proprietary software under
 * the Blender License.  See http://www.blender.org/BL/ for information
 * about this.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <math.h>
#ifndef WIN32 
#include <unistd.h>
#else
#include <io.h>
#endif

#include "MEM_guardedalloc.h"

#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"

#include "DNA_texture_types.h"
#include "DNA_image_types.h"
#include "DNA_packedFile_types.h"

#include "BLI_blenlib.h"

#include "BKE_bad_level_calls.h"
#include "BKE_utildefines.h"

#include "BKE_global.h"
#include "BKE_main.h"

#include "BKE_image.h"
#include "BKE_bmfont.h"
#include "BKE_screen.h"
#include "BKE_texture.h"
#include "BKE_packedFile.h"
#include "BKE_library.h"

void clipx_rctf_swap(rctf *stack, short *count, float x1, float x2);
void clipy_rctf_swap(rctf *stack, short *count, float y1, float y2);
float square_rctf(rctf *rf);
float clipx_rctf(rctf *rf, float x1, float x2);
float clipy_rctf(rctf *rf, float y1, float y2);
void boxsample(struct ImBuf *ibuf,
                     float minx, float miny, float maxx, float maxy,
                     float *rcol, float *gcol, float *bcol, float *acol);
void boxsampleclip(struct ImBuf *ibuf, rctf *rf, float *rcol,
                           float *gcol, float *bcol, float *acol);
void filtersample(struct ImBuf *ibuf,
                          float fx, float fy,
                          float *rcol, float *gcol, float *bcol, float *acol);

      

/* If defined: check arguments on call */
/*  #define IMAGE_C_ARG_CHECK */

/* Communicate with texture channels. */
extern float Tin, Tr, Tg, Tb, Ta;

int Talpha;
int imaprepeat, imapextend;


/*
 * 
 *  Talpha==TRUE means: read alpha from image. This does not mean that Ta
 *  should not be used, here info can be stored about outside edge of an image!
 * 
 */

void free_image_buffers(Image *ima)
{
      int a;

      if(ima->ibuf) {
            if (ima->ibuf->userdata) {
                  MEM_freeN(ima->ibuf->userdata);
                  ima->ibuf->userdata = 0;
            }
            IMB_freeImBuf(ima->ibuf);
            ima->ibuf= 0;
      }
      if(ima->anim) IMB_free_anim(ima->anim);
      ima->anim= 0;
      
      for(a=0; a<BLI_ARRAY_NELEMS(ima->mipmap); a++) {
            if(ima->mipmap[a]) IMB_freeImBuf(ima->mipmap[a]);
            ima->mipmap[a]= 0;
      }
      
      free_realtime_image(ima);
}


void free_image(Image *ima)
{

      free_image_buffers(ima);
      if (ima->packedfile) {
            freePackedFile(ima->packedfile);
            ima->packedfile = NULL;
      }
}


Image *add_image(char *name)
{
      Image *ima;
      int file, len;
      char *libname, str[256], strtest[256];
      
      strcpy(str, name);
      BLI_convertstringcode(str, G.sce, G.scene->r.cfra);
      
      file= open(str, O_BINARY|O_RDONLY);
      if(file== -1) return 0;
      close(file);
      
      /* first search an identical image */
      ima= G.main->image.first;
      while(ima) {
            strcpy(strtest, ima->name);
            BLI_convertstringcode(strtest, G.sce, G.scene->r.cfra);
            if( strcmp(strtest, str)==0 ) {
                  if(ima->anim==0 || ima->id.us==0) {
                        strcpy(ima->name, name);      /* for stringcode */
                        ima->id.us++;
                        ima->ok= 1;
                        return ima;
                  }
            }
            ima= ima->id.next;
      }

      len= strlen(name);
      
      while (len > 0 && name[len - 1] != '/' && name[len - 1] != '\\') len--;
      libname= name+len;
      
      ima= alloc_libblock(&G.main->image, ID_IM, libname);
      strcpy(ima->name, name);
      ima->ok= 1;
      
      ima->xrep= ima->yrep= 1;
      
      return ima;
}

void free_unused_animimages()
{
      Image *ima, *nima;

      ima= G.main->image.first;
      while(ima) {
            nima= ima->id.next;
            if(ima->id.us==0) {
                  if(ima->flag & IMA_FROMANIM) free_libblock(&G.main->image, ima);
            }
            ima= nima;
      }
}


/* *********** READ AND WRITE ************** */

void makepicstring(char *string, int frame)
{
      short i,len;
      char num[10], *extension;

      if (string==0) return;

      extension= "";

      strcpy(string, G.scene->r.pic);
      BLI_convertstringcode(string, G.sce, G.scene->r.cfra);

                  len= strlen(string);
                  
      /* can also: sprintf(num, "%04d", frame); */

      i=4-sprintf(num,"%d",frame);
      for(;i>0;i--){
            string[len]='0';
            len++;
      }
      string[len]=0;
      strcat(string,num);

      if(G.scene->r.imtype== R_IRIS) {
            extension= ".rgb";
      }
      else if(G.scene->r.imtype==R_IRIZ) {
            extension= ".rgb";
      }
      else if(G.scene->r.imtype==R_PNG) {
            extension= ".png";
      }
      else if(G.scene->r.imtype==R_TARGA) {
            extension= ".tga";
      }
      else if(G.scene->r.imtype==R_RAWTGA) {
            extension= ".tga";
      }
      else if(G.scene->r.imtype==R_JPEG90) {
            extension= ".jpg";
      }
      else if(G.scene->r.imtype==R_BMP) {
            extension= ".bmp";
      }
      
      if(G.scene->r.scemode & R_EXTENSION) strcat(string, extension);
            
}

/* ******** IMAGE WRAPPING INIT ************* */

void converttopremul(struct ImBuf *ibuf)
{
      int x, y, val;
      char *cp;
      
      if(ibuf==0) return;
      if(ibuf->depth==24) {   /* put alpha at 255 */

            cp= (char *)(ibuf->rect);
            for(y=0; y<ibuf->y; y++) {
                  for(x=0; x<ibuf->x; x++, cp+=4) {
                        cp[3]= 255;
                  }
            }
            return;
      }
      
      cp= (char *)(ibuf->rect);
      for(y=0; y<ibuf->y; y++) {
            for(x=0; x<ibuf->x; x++, cp+=4) {
                  if(cp[3]==0) {
                        cp[0]= cp[1]= cp[2]= 0;
                  }
                  else if(cp[3]!=255) {
                        val= cp[3];
                        cp[0]= (cp[0]*val)>>8;
                        cp[1]= (cp[1]*val)>>8;
                        cp[2]= (cp[2]*val)>>8;
                  }
            }
      }
}



void makemipmap(Image *ima)
{
      struct ImBuf *ibuf;
      int minsize, curmap=0;

      ibuf= ima->ibuf;
      minsize= MIN2(ibuf->x, ibuf->y);

      while(minsize>3 && curmap<BLI_ARRAY_NELEMS(ima->mipmap)) {

            ibuf= IMB_dupImBuf(ibuf);
            IMB_filter(ibuf);
            ima->mipmap[curmap]= (struct ImBuf *)IMB_onehalf(ibuf);
            IMB_freeImBuf(ibuf);
            ibuf= ima->mipmap[curmap];
            
            curmap++;
            minsize= MIN2(ibuf->x, ibuf->y);
      }
}

struct anim *openanim(char * name, int flags)
{
      struct anim * anim;
      struct ImBuf * ibuf;
      
      anim = IMB_open_anim(name, flags);
      if (anim == 0) return(0);

      
      ibuf = IMB_anim_absolute(anim, 0);
      if (ibuf == 0) {
            printf("anim_absolute 0 failed\n");
            IMB_free_anim(anim);
            return(0);
      }
      IMB_freeImBuf(ibuf);
      
      return(anim);
}

int calcimanr(int cfra, Tex *tex)
{
      int imanr, len, a, fra, dur;

      /* here (+fie_ima/2-1) makes sure that division happens correctly */
      
      if(tex->frames==0) return 1;
      
      cfra= cfra-tex->sfra+1;
      
      /* cyclic */
      if(tex->len==0) len= (tex->fie_ima*tex->frames)/2;
      else len= tex->len;
      
      if(tex->imaflag & TEX_ANIMCYCLIC) {
            cfra= ( (cfra) % len );
            if(cfra < 0) cfra+= len;
            if(cfra==0) cfra= len;
      }
      
      if(cfra<1) cfra= 1;
      else if(cfra>len) cfra= len;
      
      /* convert current frame to current field */
      cfra= 2*(cfra);
      if(R.flag & R_SEC_FIELD) cfra++;
      
      /* transform to images space */
      imanr= (cfra+tex->fie_ima-2)/tex->fie_ima;
      if(imanr>tex->frames) imanr= tex->frames;
      imanr+= tex->offset;
      
      if(tex->imaflag & TEX_ANIMCYCLIC) {
            imanr= ( (imanr) % len );
            while(imanr < 0) imanr+= len;
            if(imanr==0) imanr= len;
      }

      /* are there images that last longer? */
      for(a=0; a<4; a++) {
            if(tex->fradur[a][0]) {
                  
                  fra= tex->fradur[a][0];
                  dur= tex->fradur[a][1]-1;
                  
                  while(dur>0 && imanr>fra) {
                        imanr--;
                        dur--;
                  }
            }
      }

      return imanr;
}

void do_laseroptics_patch(ImBuf *ibuf)
{
      char *rt;
      float fac;
      int a, val;
      
      rt= (char *)ibuf->rect;
      a= ibuf->x*ibuf->y;

      if(ibuf->flags & IB_fields) a+= a;

      while(a--) {
            
            fac= (rt[1]+rt[2]+rt[3])/765.0f;
            val= (int)((255.0/0.8)*(fac-0.1));
            
            if(val<0) val= 0; else if(val>255) val= 255;
            
            rt[0]= rt[1]= rt[2]= rt[3]= val;
            
            rt+= 4;
      }
}

void de_interlace_ng(struct ImBuf *ibuf)  /* neogeo fields */
{
      struct ImBuf * tbuf1, * tbuf2;
      
      if (ibuf == 0) return;
      if (ibuf->flags & IB_fields) return;
      ibuf->flags |= IB_fields;
      
      if (ibuf->rect) {
            /* make copies */
            tbuf1 = IMB_allocImBuf(ibuf->x, (short)(ibuf->y >> 1), (unsigned char)32, (int)IB_rect, (unsigned char)0);
            tbuf2 = IMB_allocImBuf(ibuf->x, (short)(ibuf->y >> 1), (unsigned char)32, (int)IB_rect, (unsigned char)0);
            
            ibuf->x *= 2;
            /* These rectop calls are broken!!! I added a trailing 0 arg... */
            IMB_rectop(tbuf1, ibuf, 0, 0, 0, 0, 32767, 32767, IMB_rectcpy, 0);
            IMB_rectop(tbuf2, ibuf, 0, 0, tbuf2->x, 0, 32767, 32767, IMB_rectcpy, 0);
      
            ibuf->x /= 2;
            IMB_rectop(ibuf, tbuf1, 0, 0, 0, 0, 32767, 32767, IMB_rectcpy, 0);
            IMB_rectop(ibuf, tbuf2, 0, tbuf2->y, 0, 0, 32767, 32767, IMB_rectcpy, 0);
            
            IMB_freeImBuf(tbuf1);
            IMB_freeImBuf(tbuf2);
      }
      ibuf->y /= 2;
}

void de_interlace_st(struct ImBuf *ibuf)  /* standard fields */
{
      struct ImBuf * tbuf1, * tbuf2;
      
      if (ibuf == 0) return;
      if (ibuf->flags & IB_fields) return;
      ibuf->flags |= IB_fields;
      
      if (ibuf->rect) {
            /* make copies */
            tbuf1 = IMB_allocImBuf(ibuf->x, (short)(ibuf->y >> 1), (unsigned char)32, IB_rect, 0);
            tbuf2 = IMB_allocImBuf(ibuf->x, (short)(ibuf->y >> 1), (unsigned char)32, IB_rect, 0);
            
            ibuf->x *= 2;
            /* These are brolenm as well... */
            IMB_rectop(tbuf1, ibuf, 0, 0, 0, 0, 32767, 32767, IMB_rectcpy, 0);
            IMB_rectop(tbuf2, ibuf, 0, 0, tbuf2->x, 0, 32767, 32767, IMB_rectcpy, 0);
      
            ibuf->x /= 2;
            IMB_rectop(ibuf, tbuf2, 0, 0, 0, 0, 32767, 32767, IMB_rectcpy, 0);
            IMB_rectop(ibuf, tbuf1, 0, tbuf2->y, 0, 0, 32767, 32767, IMB_rectcpy, 0);
            
            IMB_freeImBuf(tbuf1);
            IMB_freeImBuf(tbuf2);
      }
      ibuf->y /= 2;
}

/*
load_image handles reading the image from disk or from the packedfile.
*/

void load_image(Image * ima, int flags, char *relabase, int framenum)
{
      char name[FILE_MAXDIR + FILE_MAXFILE];

      if (ima->ibuf == NULL) {

            // is there a PackedFile with this image ?;
            if (ima->packedfile) {
                  ima->ibuf = IMB_ibImageFromMemory((int *) ima->packedfile->data, ima->packedfile->size, flags);
            } else {
                  strcpy(name, ima->name);
                  BLI_convertstringcode(name, relabase, framenum);

                  ima->ibuf = IMB_loadiffname(name , flags);
            }
            // check if the image is a font image...
            // printf("Checking for font\n");

            if (ima->ibuf) {
                  detectBitmapFont(ima->ibuf);
            }
      }
}

void ima_ibuf_is_nul(Tex *tex)
{
      void (*de_interlacefunc)(struct ImBuf *ibuf);
      Image *ima;
      int a, fra, dur;
      char str[FILE_MAXDIR+FILE_MAXFILE], *cp;
            
      ima= tex->ima;
      if(ima==0) return;

      waitcursor(1);
            
      strcpy(str, ima->name);
      BLI_convertstringcode(str, G.sce, G.scene->r.cfra);
      
      if(tex->imaflag & TEX_STD_FIELD) de_interlacefunc= de_interlace_st;
      else de_interlacefunc= de_interlace_ng;

      if(tex->imaflag & TEX_ANIM5) {
      
            if(ima->anim==0) ima->anim = openanim(str, IB_cmap | IB_rect);
            if (ima->anim) {
                  dur = IMB_anim_get_duration(ima->anim);
                  
                  ima->lastquality= R.osa;
                  fra= ima->lastframe-1;

                  if(fra<0) fra = 0;
                  if(fra>(dur-1)) fra= dur-1;
                  ima->ibuf = IMB_anim_absolute(ima->anim, fra);

                  /* patch for textbutton with name ima (B_NAMEIMA) */
                  if(ima->ibuf) {
                        strcpy(ima->ibuf->name, ima->name);
                        if (tex->imaflag & TEX_FIELDS) de_interlacefunc(ima->ibuf);
                  }
            }
            else error("Not an anim");

      } else {
            // create a packedfile for this image when autopack is on
            // for performance (IMB_loadiffname uses mmap) we don't do this by default
            if ((ima->packedfile == NULL) && (G.fileflags & G_AUTOPACK)) {
                  ima->packedfile = newPackedFile(str);
            }
            
            load_image(ima, IB_rect, G.sce, G.scene->r.cfra);

            if (tex->imaflag & TEX_FIELDS) de_interlacefunc(ima->ibuf);
            
            ima->lastquality= R.osa;
      }
      
      if(ima->ibuf) {
            
            /* stringcodes also in ibuf. ibuf->name is used as 'undo' (buttons.c) */
            strcpy(ima->ibuf->name, ima->name);
            
            if(ima->ibuf->cmap) {
                  
                  if(tex->imaflag & TEX_ANIM5) {
                  
                        if(tex->imaflag & TEX_MORKPATCH) {
                                    /**** PATCH TO SET COLOR 2 RIGHT (neogeo..) */
                              if(ima->ibuf->maxcol > 4) {
                                    cp= (char *)(ima->ibuf->cmap+2);
                                    cp[0]= 0x80;
                              }
                        }
                  
                        IMB_applycmap(ima->ibuf);
                        IMB_convert_rgba_to_abgr(ima->ibuf->x*ima->ibuf->y, ima->ibuf->rect);
                        
                  }
                  
                  converttopremul(ima->ibuf);
            }
            
            if(R.osa) {
                  
                  if(tex->imaflag & TEX_ANTISCALE) {
                        IMB_clever_double(ima->ibuf);
                        IMB_antialias(ima->ibuf);
                  }
                  else if(tex->imaflag & TEX_ANTIALI) IMB_antialias(ima->ibuf);
            }
      }
      
      if(ima->ibuf==0) ima->ok= 0;
      
      for(a=0; a<BLI_ARRAY_NELEMS(ima->mipmap); a++) {
            if(ima->mipmap[a]) IMB_freeImBuf(ima->mipmap[a]);
            ima->mipmap[a]= 0;
      }

      if((R.flag & R_RENDERING)==0) waitcursor(0);
      
}



/* *********** IMAGEWRAPPING ****************** */


int imagewrap(Tex *tex, float *texvec)
{
      Image *ima;
      struct ImBuf *ibuf;
      float fx, fy, val1, val2, val3;
      int ofs, x, y;
      char *rect;

      Tin= Ta= Tr= Tg= Tb= 0.0;
      ima= tex->ima;
      if(ima==0 || ima->ok== 0) {
            return 0;
      }
      
      if(ima->ibuf==0) ima_ibuf_is_nul(tex);

      if (ima->ok) {
            ibuf = ima->ibuf;

            if(tex->imaflag & TEX_IMAROT) {
                  fy= texvec[0];
                  fx= texvec[1];
            }
            else {
                  fx= texvec[0];
                  fy= texvec[1];
            }
            
            if(tex->extend == TEX_CHECKER) {
                  int xs, ys;
                  
                  xs= (int)floor(fx);
                  ys= (int)floor(fy);
                  fx-= xs;
                  fy-= ys;

                  if( (tex->flag & TEX_CHECKER_ODD)==0) {
                        if((xs+ys) & 1);else return 0;
                  }
                  if( (tex->flag & TEX_CHECKER_EVEN)==0) {
                        if((xs+ys) & 1) return 0; 
                  }
                  /* scale around center, (0.5, 0.5) */
                  if(tex->checkerdist<1.0) {
                        fx= (fx-0.5)/(1.0-tex->checkerdist) +0.5;
                        fy= (fy-0.5)/(1.0-tex->checkerdist) +0.5;
                  }
            }

            x = (int)(fx*ibuf->x);
            y = (int)(fy*ibuf->y);

            if(tex->extend == TEX_CLIPCUBE) {
                  if(x<0 || y<0 || x>=ibuf->x || y>=ibuf->y || texvec[2]<-1.0 || texvec[2]>1.0) {
                        return 0;
                  }
            }
            else if( tex->extend==TEX_CLIP || tex->extend==TEX_CHECKER) {
                  if(x<0 || y<0 || x>=ibuf->x || y>=ibuf->y) {
                        return 0;
                  }
            }
            else {
                  if(tex->extend==TEX_EXTEND) {
                        if(x>=ibuf->x) x = ibuf->x-1;
                        else if(x<0) x= 0;
                  }
                  else {
                        x= x % ibuf->x;
                        if(x<0) x+= ibuf->x;
                  }
                  if(tex->extend==TEX_EXTEND) {
                        if(y>=ibuf->y) y = ibuf->y-1;
                        else if(y<0) y= 0;
                  }
                  else {
                        y= y % ibuf->y;
                        if(y<0) y+= ibuf->y;
                  }
            }
            
            /* warning, no return before setting back! */
            if( (R.flag & R_SEC_FIELD) && (ibuf->flags & IB_fields) ) {
                  ibuf->rect+= (ibuf->x*ibuf->y);
            }

            ofs = y * ibuf->x + x;
            rect = (char *)( ibuf->rect+ ofs);

            if( (R.flag & R_SEC_FIELD) && (ibuf->flags & IB_fields) ) {
                  ibuf->rect-= (ibuf->x*ibuf->y);
            }

            Talpha= 0;
            if(tex->imaflag & TEX_USEALPHA) {
                  if(tex->imaflag & TEX_CALCALPHA);
                  else Talpha= 1;
            }

            Tr = ((float)rect[0])/255.0f;
            Tg = ((float)rect[1])/255.0f;
            Tb = ((float)rect[2])/255.0f;
            
            if(tex->nor) {
                  if(tex->imaflag & TEX_NORMALMAP) {
                        tex->nor[0]= 0.5-Tr;
                        tex->nor[1]= 0.5-Tg;
                        tex->nor[2]= -Tb;
                  }
                  else {
                        /* bump: take three samples */
                        val1= Tr+Tg+Tb;

                        if(x<ibuf->x-1) {
                              rect+=4;
                              val2= ((float)(rect[0]+rect[1]+rect[2]))/255.0f;
                              rect-=4;
                        }
                        else val2= val1;

                        if(y<ibuf->y-1) {
                              rect+= 4*ibuf->x;
                              val3= ((float)(rect[0]+rect[1]+rect[2]))/255.0f;
                        }
                        else val3= val1;

                        /* do not mix up x and y here! */
                        tex->nor[0]= (val1-val2);
                        tex->nor[1]= (val1-val3);
                  }
            }

            BRICONRGB;

            if(Talpha) Ta= Tin= ((float)rect[3])/255.0f;
            else if(tex->imaflag & TEX_CALCALPHA) {
                  Ta= Tin= MAX3(Tr, Tg, Tb);
            }
            else Ta= Tin= 1.0;
            
            if(tex->flag & TEX_NEGALPHA) Ta= 1.0f-Ta;

      }

      if(tex->nor) return 3;
      else return 1;
}

void clipx_rctf_swap(rctf *stack, short *count, float x1, float x2)
/*  rctf *stack; */
/*  short *count; */
/*  float x1, x2; */
{
      rctf *rf, *newrct;
      short a;

      a= *count;
      rf= stack;
      for(;a>0;a--) {
            if(rf->xmin<x1) {
                  if(rf->xmax<x1) {
                        rf->xmin+= (x2-x1);
                        rf->xmax+= (x2-x1);
                  }
                  else {
                        if(rf->xmax>x2) rf->xmax= x2;
                        newrct= stack+ *count;
                        (*count)++;

                        newrct->xmax= x2;
                        newrct->xmin= rf->xmin+(x2-x1);
                        newrct->ymin= rf->ymin;
                        newrct->ymax= rf->ymax;
                        
                        if(newrct->xmin==newrct->xmax) (*count)--;
                        
                        rf->xmin= x1;
                  }
            }
            else if(rf->xmax>x2) {
                  if(rf->xmin>x2) {
                        rf->xmin-= (x2-x1);
                        rf->xmax-= (x2-x1);
                  }
                  else {
                        if(rf->xmin<x1) rf->xmin= x1;
                        newrct= stack+ *count;
                        (*count)++;

                        newrct->xmin= x1;
                        newrct->xmax= rf->xmax-(x2-x1);
                        newrct->ymin= rf->ymin;
                        newrct->ymax= rf->ymax;

                        if(newrct->xmin==newrct->xmax) (*count)--;

                        rf->xmax= x2;
                  }
            }
            rf++;
      }

}

void clipy_rctf_swap(rctf *stack, short *count, float y1, float y2)
/*  rctf *stack; */
/*  short *count; */
/*  float y1, y2; */
{
      rctf *rf, *newrct;
      short a;

      a= *count;
      rf= stack;
      for(;a>0;a--) {
            if(rf->ymin<y1) {
                  if(rf->ymax<y1) {
                        rf->ymin+= (y2-y1);
                        rf->ymax+= (y2-y1);
                  }
                  else {
                        if(rf->ymax>y2) rf->ymax= y2;
                        newrct= stack+ *count;
                        (*count)++;

                        newrct->ymax= y2;
                        newrct->ymin= rf->ymin+(y2-y1);
                        newrct->xmin= rf->xmin;
                        newrct->xmax= rf->xmax;

                        if(newrct->ymin==newrct->ymax) (*count)--;

                        rf->ymin= y1;
                  }
            }
            else if(rf->ymax>y2) {
                  if(rf->ymin>y2) {
                        rf->ymin-= (y2-y1);
                        rf->ymax-= (y2-y1);
                  }
                  else {
                        if(rf->ymin<y1) rf->ymin= y1;
                        newrct= stack+ *count;
                        (*count)++;

                        newrct->ymin= y1;
                        newrct->ymax= rf->ymax-(y2-y1);
                        newrct->xmin= rf->xmin;
                        newrct->xmax= rf->xmax;

                        if(newrct->ymin==newrct->ymax) (*count)--;

                        rf->ymax= y2;
                  }
            }
            rf++;
      }

}



float square_rctf(rctf *rf)
/*  rctf *rf; */
{
      float x, y;

      x= rf->xmax- rf->xmin;
      y= rf->ymax- rf->ymin;
      return (x*y);
}

float clipx_rctf(rctf *rf, float x1, float x2)
/*  rctf *rf; */
/*  float x1, x2; */
{
      float size;

      size= rf->xmax - rf->xmin;

      if(rf->xmin<x1) {
            rf->xmin= x1;
      }
      if(rf->xmax>x2) {
            rf->xmax= x2;
      }
      if(rf->xmin > rf->xmax) {
            rf->xmin = rf->xmax;
            return 0.0;
      }
      else if(size!=0.0) {
            return (rf->xmax - rf->xmin)/size;
      }
      return 1.0;
}

float clipy_rctf(rctf *rf, float y1, float y2)
/*  rctf *rf; */
/*  float y1, y2; */
{
      float size;

      size= rf->ymax - rf->ymin;
/* PRINT(f, size); */
      if(rf->ymin<y1) {
            rf->ymin= y1;
      }
      if(rf->ymax>y2) {
            rf->ymax= y2;
      }
/* PRINT(f, size); */
      if(rf->ymin > rf->ymax) {
            rf->ymin = rf->ymax;
            return 0.0;
      }
      else if(size!=0.0) {
            return (rf->ymax - rf->ymin)/size;
      }
      return 1.0;

}

void boxsampleclip(struct ImBuf *ibuf, rctf *rf, float *rcol,
                           float *gcol, float *bcol, float *acol) /* return color 0.0-1.0 */
/*  struct ImBuf *ibuf; */
/*  rctf *rf; */
/*  float *rcol, *gcol, *bcol, *acol; */
{
      /* sample box, is clipped already, and minx etc. have been set at ibuf size.
       Enlarge with antialiased edges of the pixels */

      float muly,mulx,div;
      int ofs;
      int x, y, startx, endx, starty, endy;
      char *rect;

      startx= (int)floor(rf->xmin);
      endx= (int)floor(rf->xmax);
      starty= (int)floor(rf->ymin);
      endy= (int)floor(rf->ymax);

      if(startx < 0) startx= 0;
      if(starty < 0) starty= 0;
      if(endx>=ibuf->x) endx= ibuf->x-1;
      if(endy>=ibuf->y) endy= ibuf->y-1;

      if(starty==endy && startx==endx) {

            ofs = starty*ibuf->x + startx;
            rect = (char *)(ibuf->rect +ofs);
            *rcol= ((float)rect[0])/255.0f;
            *gcol= ((float)rect[1])/255.0f;
            *bcol= ((float)rect[2])/255.0f;
                  /* alpha is global, has been set in function imagewraposa() */
            if(Talpha) {
                  *acol= ((float)rect[3])/255.0f;
            }
      }
      else {
            div= *rcol= *gcol= *bcol= *acol= 0.0;
            for(y=starty;y<=endy;y++) {
                  ofs = y*ibuf->x +startx;
                  rect = (char *)(ibuf->rect+ofs);

                  muly= 1.0;

                  if(starty==endy);
                  else {
                        if(y==starty) muly= 1.0f-(rf->ymin - y);
                        if(y==endy) muly= (rf->ymax - y);
                  }
                  if(startx==endx) {
                        mulx= muly;
                        if(Talpha) *acol+= mulx*rect[3];
                        *rcol+= mulx*rect[0];
                        *gcol+= mulx*rect[1];
                        *bcol+= mulx*rect[2];
                        div+= mulx;
                  }
                  else {
                        for(x=startx;x<=endx;x++) {
                              mulx= muly;
                              if(x==startx) mulx*= 1.0f-(rf->xmin - x);
                              if(x==endx) mulx*= (rf->xmax - x);

                              if(mulx==1.0) {
                                    if(Talpha) *acol+= rect[3];
                                    *rcol+= rect[0];
                                    *gcol+= rect[1];
                                    *bcol+= rect[2];
                                    div+= 1.0;
                              }
                              else {
                                    if(Talpha) *acol+= mulx*rect[3];
                                    *rcol+= mulx*rect[0];
                                    *gcol+= mulx*rect[1];
                                    *bcol+= mulx*rect[2];
                                    div+= mulx;
                              }
                              rect+=4;
                        }
                  }
            }
            if(div!=0.0) {
                  div*= 255.0;
      
                  *bcol/= div;
                  *gcol/= div;
                  *rcol/= div;
                  
                  if(Talpha) *acol/= div;
            }
            else {
                  *rcol= *gcol= *bcol= *acol= 0.0;
            }
      }
}

void boxsample(struct ImBuf *ibuf,
                     float minx, float miny, float maxx, float maxy,
                     float *rcol, float *gcol, float *bcol, float *acol)      /* return color 0.0-1.0 */
/*  struct ImBuf *ibuf; */
/*  float minx, miny, maxx, maxy; */
/*  float *rcol, *gcol, *bcol, *acol; */
{
      /* Sample box, performs clip. minx etc are in range 0.0 - 1.0 .
     * Enlarge with antialiased edges of pixels.
     * If global variable 'imaprepeat' has been set, the
     *  clipped-away parts are sampled as well.
     */
      rctf *rf, stack[8];
      float opp, tot, r, g, b, a, alphaclip= 1.0;
      short count=1;

      rf= stack;
      rf->xmin= minx*(ibuf->x);
      rf->xmax= maxx*(ibuf->x);
      rf->ymin= miny*(ibuf->y);
      rf->ymax= maxy*(ibuf->y);

      if(imapextend);
      else if(imaprepeat) clipx_rctf_swap(stack, &count, 0.0, (float)(ibuf->x));
      else {
            alphaclip= clipx_rctf(rf, 0.0, (float)(ibuf->x));

            if(alphaclip<=0.0) {
                  *rcol= *bcol= *gcol= *acol= 0.0;
                  return;
            }
      }

      if(imapextend);
      else if(imaprepeat) clipy_rctf_swap(stack, &count, 0.0, (float)(ibuf->y));
      else {
            alphaclip*= clipy_rctf(rf, 0.0, (float)(ibuf->y));

            if(alphaclip<=0.0) {
                  *rcol= *bcol= *gcol= *acol= 0.0;
                  return;
            }
      }

      if(count>1) {
            tot= *rcol= *bcol= *gcol= *acol= 0.0;
            while(count--) {
                  boxsampleclip(ibuf, rf, &r, &g, &b, &a);
                  
                  opp= square_rctf(rf);
                  tot+= opp;

                  *rcol+= opp*r;
                  *gcol+= opp*g;
                  *bcol+= opp*b;
                  if(Talpha) *acol+= opp*a;
                  rf++;
            }
            if(tot!= 0.0) {
                  *rcol/= tot;
                  *gcol/= tot;
                  *bcol/= tot;
                  if(Talpha) *acol/= tot;
            }
      }
      else {
            boxsampleclip(ibuf, rf, rcol, gcol, bcol, acol);
      }

      if(Talpha==0) *acol= 1.0;
      
      if(alphaclip!=1.0) {
            /* this is for laetr investigation, premul or not? */
            /* *rcol*= alphaclip; */
            /* *gcol*= alphaclip; */
            /* *bcol*= alphaclip; */
            *acol*= alphaclip;
      }
}     

void filtersample(struct ImBuf *ibuf,
                          float fx, float fy,
                          float *rcol, float *gcol, float *bcol, float *acol)
      /* return color 0.0-1.0 */
/*  struct ImBuf *ibuf; */                                                          /* fx en fy tussen 0.0 en 1.0 */
/*  float fx, fy; */
/*  float *rcol, *gcol, *bcol, *acol; */
{
      /* with weighted filter 3x3
     * left or right collumn is always 0
     * upper or lower row is awlays 0
     */

      int fac, fac1, fac2, fracx, fracy, filt[4];
      int ix, iy, x4;
      unsigned int r=0, g=0, b=0, a=0;
      char *rowcol, *rfilt[4];

      ix= (int)( 256.0*fx );
      fracx= (ix & 255);
      ix= (ix>>8);
      iy= (int)( 256.0*fy );
      fracy= (iy & 255);
      iy= (iy>>8);
      
      if(ix>=ibuf->x) ix= ibuf->x-1;
      if(iy>=ibuf->y) iy= ibuf->y-1;
      
      rowcol= (char *)(ibuf->rect+ iy*ibuf->x +ix);

      rfilt[0]= rfilt[1]= rfilt[2]= rfilt[3]= rowcol;
      x4= 4*ibuf->x;

      if(fracx<128) {
            if(ix>0) { 
                  rfilt[0]-= 4; 
                  rfilt[2]-=4; 
            }
            else if(imaprepeat) { 
                  rfilt[0]+= x4-4; 
                  rfilt[2]+= x4-4; 
            }

            if(fracy<128) {
                  /* case left-under */
                  fac1= 128+fracy;
                  fac2= 128-fracy;

                  if(iy>0) { 
                        rfilt[3]-= x4; 
                        rfilt[2]-= x4; 
                  }
                  else if(imaprepeat) {
                        fac= x4*(ibuf->y-1) ;
                        rfilt[3]+= fac; 
                        rfilt[2]+= fac;
                  }
            }
            else {
                  /* case left-upper */
                  fac2= 384-fracy;
                  fac1= fracy-128;

                  if(iy<ibuf->y-1) { 
                        rfilt[1]+= x4; 
                        rfilt[0]+= x4; 
                  }
                  else if(imaprepeat) {
                        fac= x4*(ibuf->y-1) ;
                        rfilt[1]-= fac; 
                        rfilt[0]-= fac;
                  }
            }

            filt[1]=filt[3]= 128+ fracx;
            filt[0]=filt[2]= 128- fracx;
            filt[0]*= fac1; 
            filt[1]*= fac1;
            filt[2]*= fac2; 
            filt[3]*= fac2;
      }
      else {
            if(fracy<128) {
                  /* case right-under */
                  fac1= 128+fracy;
                  fac2= 128-fracy;

                  if(iy>0) { 
                        rfilt[3]-= x4; 
                        rfilt[2]-= x4; 
                  }
                  else if(imaprepeat) {
                        fac= x4*(ibuf->y-1) ;
                        rfilt[3]+= fac; 
                        rfilt[2]+= fac;
                  }
            }
            else {
                  /* case right-upper */
                  fac2= 384-fracy;
                  fac1= fracy-128;

                  if(iy<ibuf->y-1) { 
                        rfilt[1]+= x4; 
                        rfilt[0]+= x4; 
                  }
                  else if(imaprepeat) {
                        fac= x4*(ibuf->y-1) ;
                        rfilt[1]-= fac; 
                        rfilt[0]-= fac;
                  }
            }
            filt[0]=filt[2]= 384-fracx;
            filt[1]=filt[3]= fracx-128;
            filt[0]*= fac1; 
            filt[1]*= fac1;
            filt[2]*= fac2; 
            filt[3]*= fac2;

            if(ix<ibuf->x-1) { 
                  rfilt[1]+= 4; 
                  rfilt[3]+=4; 
            }
            else if(imaprepeat) { 
                  rfilt[1]-= x4-4; 
                  rfilt[3]-= x4-4; 
            }
      }

      for(fac=3; fac>=0; fac--) {
            rowcol= rfilt[fac];
            r+= filt[fac]*rowcol[0];
            g+= filt[fac]*rowcol[1];
            b+= filt[fac]*rowcol[2];
            if(Talpha) a+= filt[fac]*rowcol[3];       /* alpha is global */
      }
      *rcol= ((float)r)/16777216.0f;
      *gcol= ((float)g)/16777216.0f;
      *bcol= ((float)b)/16777216.0f;
      if(Talpha) *acol= ((float)a)/16777216.0f;
      
}


int imagewraposa(Tex *tex, float *texvec, float *dxt, float *dyt)
{
      struct Image *ima;
      struct ImBuf *ibuf, *previbuf;
      float fx, fy, minx, maxx, miny, maxy, dx, dy, fac1, fac2, fac3, fac4;
      float maxd, pixsize, val1, val2, val3;
      int curmap;

#ifdef IMAGE_C_ARG_CHECK
      if (!tex) {
            printf("imagewraposa: null pointer to texture\n");
      }
#endif
      
      ima= tex->ima;
#ifdef IMAGE_C_ARG_CHECK
      if (!ima) {
            printf("imagewraposa: null pointer to image\n");
      }
#endif

      Tin= Ta= Tr= Tg= Tb= 0.0;

      if(ima==0 || ima->ok== 0) {
            return 0;
      }
      
      if(ima->ibuf==0) ima_ibuf_is_nul(tex);

      if (ima->ok) {
      
            if(tex->imaflag & TEX_MIPMAP) {
                  if(ima->mipmap[0]==0) makemipmap(ima);
            }
      
            ibuf = ima->ibuf;
            
            Talpha= 0;
            if(tex->imaflag & TEX_USEALPHA) {
                  if(tex->imaflag & TEX_CALCALPHA);
                  else Talpha= 1;
            }
            
            if(tex->imaflag & TEX_IMAROT) {
                  fy= texvec[0];
                  fx= texvec[1];
            }
            else {
                  fx= texvec[0];
                  fy= texvec[1];
            }
            
            if(ibuf->flags & IB_fields) {
                  if(R.r.mode & R_FIELDS) {                 /* field render */
                        if(R.flag & R_SEC_FIELD) {          /* correction for 2nd field */
                              /* fac1= 0.5/( (float)ibuf->y ); */
                              /* fy-= fac1; */
                        }
                        else {                        /* first field */
                              fac1= 0.5f/( (float)ibuf->y );
                              fy+= fac1;
                        }
                  }
            }
            
            /* pixel coordinates */

            minx= MIN3(dxt[0],dyt[0],dxt[0]+dyt[0] );
            maxx= MAX3(dxt[0],dyt[0],dxt[0]+dyt[0] );
            miny= MIN3(dxt[1],dyt[1],dxt[1]+dyt[1] );
            maxy= MAX3(dxt[1],dyt[1],dxt[1]+dyt[1] );

            /* tex_sharper has been removed */

            minx= tex->filtersize*(maxx-minx)/2.0f;
            miny= tex->filtersize*(maxy-miny)/2.0f;
            
            if(tex->imaflag & TEX_IMAROT) SWAP(float, minx, miny);
            
            if(minx>0.25) minx= 0.25;
            else if(minx<0.00001f) minx= 0.00001f;    /* side faces of unit-cube */
            if(miny>0.25) miny= 0.25;
            else if(miny<0.00001f) miny= 0.00001f;

            
            /* repeat and clip */
            
            /* watch it: imaprepeat is global value (see boxsample) */
            imaprepeat= (tex->extend==TEX_REPEAT);
            imapextend= (tex->extend==TEX_EXTEND);

            if(tex->extend == TEX_CHECKER) {
                  int xs, ys, xs1, ys1, xs2, ys2, boundary;
                  
                  xs= (int)floor(fx);
                  ys= (int)floor(fy);
                  
                  // both checkers available, no boundary exceptions, checkerdist will eat aliasing
                  if( (tex->flag & TEX_CHECKER_ODD) && (tex->flag & TEX_CHECKER_EVEN) ) {
                        fx-= xs;
                        fy-= ys;
                  }
                  else {
                        
                        xs1= (int)floor(fx-minx);
                        ys1= (int)floor(fy-miny);
                        xs2= (int)floor(fx+minx);
                        ys2= (int)floor(fy+miny);
                        boundary= (xs1!=xs2) || (ys1!=ys2);
      
                        if(boundary==0) {
                              if( (tex->flag & TEX_CHECKER_ODD)==0) {
                                    if((xs+ys) & 1); 
                                    else return 0;
                              }
                              if( (tex->flag & TEX_CHECKER_EVEN)==0) {
                                    if((xs+ys) & 1) return 0;
                              }
                              fx-= xs;
                              fy-= ys;
                        }
                        else {
                              if(tex->flag & TEX_CHECKER_ODD) {
                                    if((xs1+ys) & 1) fx-= xs2;
                                    else fx-= xs1;
                                    
                                    if((ys1+xs) & 1) fy-= ys2;
                                    else fy-= ys1;
                              }
                              if(tex->flag & TEX_CHECKER_EVEN) {
                                    if((xs1+ys) & 1) fx-= xs1;
                                    else fx-= xs2;
                                    
                                    if((ys1+xs) & 1) fy-= ys1;
                                    else fy-= ys2;
                              }
                        }
                  }

                  /* scale around center, (0.5, 0.5) */
                  if(tex->checkerdist<1.0) {
                        fx= (fx-0.5)/(1.0-tex->checkerdist) +0.5;
                        fy= (fy-0.5)/(1.0-tex->checkerdist) +0.5;
                        minx/= (1.0-tex->checkerdist);
                        miny/= (1.0-tex->checkerdist);
                  }
            }

            if(tex->extend == TEX_CLIPCUBE) {
                  if(fx+minx<0.0 || fy+miny<0.0 || fx-minx>1.0 || fy-miny>1.0 || texvec[2]<-1.0 || texvec[2]>1.0) {
                        return 0;
                  }
            }
            else if(tex->extend==TEX_CLIP || tex->extend==TEX_CHECKER) {
                  if(fx+minx<0.0 || fy+miny<0.0 || fx-minx>1.0 || fy-miny>1.0) {
                        return 0;
                  }
            }
            else {
                  if(tex->extend==TEX_EXTEND) {
                        if(fx>1.0) fx = 1.0;
                        else if(fx<0.0) fx= 0.0;
                  }
                  else {
                        if(fx>1.0) fx -= (int)(fx);
                        else if(fx<0.0) fx+= 1-(int)(fx);
                  }
                  
                  if(tex->extend==TEX_EXTEND) {
                        if(fy>1.0) fy = 1.0;
                        else if(fy<0.0) fy= 0.0;
                  }
                  else {
                        if(fy>1.0) fy -= (int)(fy);
                        else if(fy<0.0) fy+= 1-(int)(fy);
                  }
            }
      
            /* warning no return! */
            if( (R.flag & R_SEC_FIELD) && (ibuf->flags & IB_fields) ) {
                  ibuf->rect+= (ibuf->x*ibuf->y);
            }

            /* choice:  */
            if(tex->imaflag & TEX_MIPMAP) {
                  
                  dx= minx;
                  dy= miny;
                  maxd= MAX2(dx, dy);
                  if(maxd>0.5) maxd= 0.5;

                  pixsize = 1.0f/ (float) MIN2(ibuf->x, ibuf->y);
                  
                  curmap= 0;
                  previbuf= ibuf;
                  while(curmap<BLI_ARRAY_NELEMS(ima->mipmap) && ima->mipmap[curmap]) {
                        if(maxd < pixsize) break;
                        previbuf= ibuf;
                        ibuf= ima->mipmap[curmap];
                        pixsize= 1.0f / (float)MIN2(ibuf->x, ibuf->y); /* this used to be 1.0 */            
                        curmap++;
                  }
                  
                  if(previbuf!=ibuf || (tex->imaflag & TEX_INTERPOL)) {
                        /* sample at least 1 pixel */
                        if (minx < 0.5f / ima->ibuf->x) minx = 0.5f / ima->ibuf->x;
                        if (miny < 0.5f / ima->ibuf->y) miny = 0.5f / ima->ibuf->y;
                  }
                  
                  if(tex->nor && (tex->imaflag & TEX_NORMALMAP)==0) {
                        /* a bit extra filter */
                        minx*= 1.35f;
                        miny*= 1.35f;
                        
                        boxsample(ibuf, fx-2.0f*minx, fy-2.0f*miny, fx+minx, fy+miny, &Tr, &Tg, &Tb, &Ta);
                        val1= Tr+Tg+Tb;
                        boxsample(ibuf, fx-minx, fy-2.0f*miny, fx+2.0f*minx, fy+miny, &fac1, &fac2, &fac3, &fac4);
                        val2= fac1+fac2+fac3;
                        boxsample(ibuf, fx-2.0f*minx, fy-miny, fx+minx, fy+2.0f*miny, &fac1, &fac2, &fac3, &fac4);
                        val3= fac1+fac2+fac3;
      
                        if(previbuf!=ibuf) {  /* interpolate */
                              
                              boxsample(previbuf, fx-2.0f*minx, fy-2.0f*miny, fx+minx, fy+miny, &fac1, &fac2, &fac3, &fac4);
                              
                              /* calc rgb */
                              dx= 2.0f*(pixsize-maxd)/pixsize;
                              if(dx>=1.0f) {
                                    Ta= fac4; Tb= fac3;
                                    Tg= fac2; Tr= fac1;
                              }
                              else {
                                    dy= 1.0f-dx;
                                    Tb= dy*Tb+ dx*fac3;
                                    Tg= dy*Tg+ dx*fac2;
                                    Tr= dy*Tr+ dx*fac1;
                                    if(Talpha) Ta= dy*Ta+ dx*fac4;
                              }
                              
                              val1= dy*val1+ dx*(fac1+fac2+fac3);
                              boxsample(previbuf, fx-minx, fy-2.0f*miny, fx+2.0f*minx, fy+miny, &fac1, &fac2, &fac3, &fac4);
                              val2= dy*val2+ dx*(fac1+fac2+fac3);
                              boxsample(previbuf, fx-2.0f*minx, fy-miny, fx+minx, fy+2.0f*miny, &fac1, &fac2, &fac3, &fac4);
                              val3= dy*val3+ dx*(fac1+fac2+fac3);
                        }

                        /* don't switch x or y! */
                        tex->nor[0]= (val1-val2);
                        tex->nor[1]= (val1-val3);
                  }
                  else {
                        maxx= fx+minx;
                        minx= fx-minx;
                        maxy= fy+miny;
                        miny= fy-miny;
      
                        boxsample(ibuf, minx, miny, maxx, maxy, &Tr, &Tg, &Tb, &Ta);
      
                        if(previbuf!=ibuf) {  /* interpolate */
                              boxsample(previbuf, minx, miny, maxx, maxy, &fac1, &fac2, &fac3, &fac4);
                              
                              fx= 2.0f*(pixsize-maxd)/pixsize;
                              
                              if(fx>=1.0) {
                                    Ta= fac4; Tb= fac3;
                                    Tg= fac2; Tr= fac1;
                              } else {
                                    fy= 1.0f-fx;
                                    Tb= fy*Tb+ fx*fac3;
                                    Tg= fy*Tg+ fx*fac2;
                                    Tr= fy*Tr+ fx*fac1;
                                    if(Talpha) Ta= fy*Ta+ fx*fac4;
                              }
                        }
                  }
            }
            else {
                  if((tex->imaflag & TEX_INTERPOL)) {
                        /* sample 1 pixel minimum */
                        if (minx < 0.5f / ima->ibuf->x) minx = 0.5f / ima->ibuf->x;
                        if (miny < 0.5f / ima->ibuf->y) miny = 0.5f / ima->ibuf->y;
                  }

                  if(tex->nor && (tex->imaflag & TEX_NORMALMAP)==0) {
                        
                        /* a bit extra filter */
                        minx*= 1.35f;
                        miny*= 1.35f;
                        
                        boxsample(ibuf, fx-2.0f*minx, fy-2.0f*miny, fx+minx, fy+miny, &Tr, &Tg, &Tb, &Ta);
                        val1= Tr+Tg+Tb;

                        boxsample(ibuf, fx-minx, fy-2.0f*miny, fx+2.0f*minx, fy+miny, &fac1, &fac2, &fac3, &fac4);
                        val2= fac1+fac2+fac3;
                        
                        boxsample(ibuf, fx-2.0f*minx, fy-miny, fx+miny, fy+2.0f*miny, &fac1, &fac2, &fac3, &fac4);
                        val3= fac1+fac2+fac3;

                        /* don't switch x or y! */
                        tex->nor[0]= (val1-val2);
                        tex->nor[1]= (val1-val3);
                  }
                  else {
                        boxsample(ibuf, fx-minx, fy-miny, fx+minx, fy+miny, &Tr, &Tg, &Tb, &Ta);
                  }
            }
            
            BRICONRGB;
            
            if(tex->imaflag & TEX_CALCALPHA) {
                  Ta= Tin= Ta*MAX3(Tr, Tg, Tb);
            }
            else Tin= Ta;
            if(tex->flag & TEX_NEGALPHA) Ta= 1.0f-Ta;
            
            if( (R.flag & R_SEC_FIELD) && (ibuf->flags & IB_fields) ) {
                  ibuf->rect-= (ibuf->x*ibuf->y);
            }

            if(tex->nor && (tex->imaflag & TEX_NORMALMAP)) {
                  tex->nor[0]= 0.5-Tr;
                  tex->nor[1]= 0.5-Tg;
                  tex->nor[2]= -Tb;
            }
      }
      else {
            Tin= 0.0f;
            return 0;
      }
      
      if(tex->nor) return 3;
      else return 1;
}


Generated by  Doxygen 1.6.0   Back to index