source/blender/imbuf/intern/imageprocess.c

   1 /**
   2  *
   3  * ***** BEGIN GPL LICENSE BLOCK *****
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software Foundation,
  17  * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18  *
  19  * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
  20  * All rights reserved.
  21  *
  22  * The Original Code is: all of this file.
  23  *
  24  * Contributor(s): none yet.
  25  *
  26  * ***** END GPL LICENSE BLOCK *****
  27  * This file was moved here from the src/ directory. It is meant to
  28  * deal with endianness. It resided in a general blending lib. The
  29  * other functions were only used during rendering. This single
  30  * function remained. It should probably move to imbuf/intern/util.c,
  31  * but we'll keep it here for the time being. (nzc)*/
  32
  33 /*  imageprocess.c        MIXED MODEL
  34  *
  35  *  april 95
  36  *
  37  * $Id$
  38  */
  39
  40 #include "IMB_imbuf_types.h"
  41 #include "IMB_imbuf.h"
  42 #include "math.h"
  43
  44 /* This define should be relocated to a global header some where  Kent Mein
  45 I stole it from util.h in the plugins api */
  46 #define MAX2(x,y)                ( (x)>(y) ? (x) : (y) )
  47
  48 /* Only this one is used liberally here, and in imbuf */
  49 void IMB_convert_rgba_to_abgr(struct ImBuf *ibuf)
  50 {
  51         int size;
  52         unsigned char rt, *cp = (unsigned char *)ibuf->rect;
  53         float rtf, *cpf = ibuf->rect_float;
  54
  55         if (ibuf->rect) {
  56                 size = ibuf->x * ibuf->y;
  57
  58                 while(size-- > 0) {
  59                         rt= cp[0];
  60                         cp[0]= cp[3];
  61                         cp[3]= rt;
  62                         rt= cp[1];
  63                         cp[1]= cp[2];
  64                         cp[2]= rt;
  65                         cp+= 4;
  66                 }
  67         }
  68
  69         if (ibuf->rect_float) {
  70                 size = ibuf->x * ibuf->y;
  71
  72                 while(size-- > 0) {
  73                         rtf= cpf[0];
  74                         cpf[0]= cpf[3];
  75                         cpf[3]= rtf;
  76                         rtf= cpf[1];
  77                         cpf[1]= cpf[2];
  78                         cpf[2]= rtf;
  79                         cpf+= 4;
  80                 }
  81         }
  82 }
  83
  84 /**************************************************************************
  85 *                            INTERPOLATIONS
  86 *
  87 * Reference and docs:
  88 * http://wiki.blender.org/index.php/User:Damiles#Interpolations_Algorithms
  89 ***************************************************************************/
  90
  91 /* BICUBIC Interpolation functions */
  92 /*  More info: http://wiki.blender.org/index.php/User:Damiles#Bicubic_pixel_interpolation
  93 */
  94 /* function assumes out to be zero'ed, only does RGBA */
  95 static float P(float k){
  96         float aux;
  97         aux=(float)(1.0f/6.0f)*( pow( MAX2(k+2.0f,0) , 3.0f ) - 4.0f * pow( MAX2(k+1.0f,0) , 3.0f ) + 6.0f * pow( MAX2(k,0) , 3.0f ) - 4.0f * pow( MAX2(k-1.0f,0) , 3.0f));
  98         return aux ;
  99 }
 100
 101 void bicubic_interpolation(ImBuf *in, ImBuf *out, float x, float y, int xout, int yout)
 102 {
 103         int i,j,n,m,x1,y1;
 104         unsigned char *dataI,*outI;
 105         float a,b, outR,outG,outB,outA,*dataF,*outF;
 106         int do_rect, do_float;
 107
 108         if (in == NULL) return;
 109         if (in->rect == NULL && in->rect_float == NULL) return;
 110
 111         do_rect= (out->rect != NULL);
 112         do_float= (out->rect_float != NULL);
 113
 114         i= (int)floor(x);
 115         j= (int)floor(y);
 116         a= x - i;
 117         b= y - j;
 118
 119         outR= 0.0f;
 120         outG= 0.0f;
 121         outB= 0.0f;
 122         outA= 0.0f;
 123         for(n= -1; n<= 2; n++){
 124                 for(m= -1; m<= 2; m++){
 125                         x1= i+n;
 126                         y1= j+m;
 127                         if (x1>0 && x1 < in->x && y1>0 && y1<in->y) {
 128                                 if (do_float) {
 129                                         dataF= in->rect_float + in->x * y1 * 4 + 4*x1;
 130                                         outR+= dataF[0] * P(n-a) * P(b-m);
 131                                         outG+= dataF[1] * P(n-a) * P(b-m);
 132                                         outB+= dataF[2] * P(n-a) * P(b-m);
 133                                         outA+= dataF[3] * P(n-a) * P(b-m);
 134                                 }
 135                                 if (do_rect) {
 136                                         dataI= (unsigned char*)in->rect + in->x * y1 * 4 + 4*x1;
 137                                         outR+= dataI[0] * P(n-a) * P(b-m);
 138                                         outG+= dataI[1] * P(n-a) * P(b-m);
 139                                         outB+= dataI[2] * P(n-a) * P(b-m);
 140                                         outA+= dataI[3] * P(n-a) * P(b-m);
 141                                 }
 142                         }
 143                 }
 144         }
 145         if (do_rect) {
 146                 outI= (unsigned char *)out->rect + out->x * yout * 4 + 4*xout;
 147                 outI[0]= (int)outR;
 148                 outI[1]= (int)outG;
 149                 outI[2]= (int)outB;
 150                 outI[3]= (int)outA;
 151         }
 152         if (do_float) {
 153                 outF= (float *)out->rect_float + out->x * yout * 4 + 4*xout;
 154                 outF[0]= outR;
 155                 outF[1]= outG;
 156                 outF[2]= outB;
 157                 outF[3]= outA;
 158         }
 159 }
 160
 161 /* function assumes out to be zero'ed, only does RGBA */
 162 /* BILINEAR INTERPOLATION */
 163 void bilinear_interpolation(ImBuf *in, ImBuf *out, float u, float v, int xout, int yout)
 164 {
 165         float *row1, *row2, *row3, *row4, a, b, *outF;
 166         unsigned char *row1I, *row2I, *row3I, *row4I, *outI;
 167         float a_b, ma_b, a_mb, ma_mb;
 168         float empty[4]= {0.0f, 0.0f, 0.0f, 0.0f};
 169         unsigned char emptyI[4]= {0, 0, 0, 0};
 170         int y1, y2, x1, x2;
 171         int do_rect, do_float;
 172
 173         if (in==NULL) return;
 174         if (in->rect==NULL && in->rect_float==NULL) return;
 175
 176         do_rect= (out->rect != NULL);
 177         do_float= (out->rect_float != NULL);
 178
 179         x1= (int)floor(u);
 180         x2= (int)ceil(u);
 181         y1= (int)floor(v);
 182         y2= (int)ceil(v);
 183
 184         // sample area entirely outside image?
 185         if (x2<0 || x1>in->x-1 || y2<0 || y1>in->y-1) return;
 186
 187         if (do_rect)
 188                 outI=(unsigned char *)out->rect + out->x * yout * 4 + 4*xout;
 189         else
 190                 outI= NULL;
 191         if (do_float)
 192                 outF=(float *)out->rect_float + out->x * yout * 4 + 4*xout;
 193         else
 194                 outF= NULL;
 195
 196         if (do_float) {
 197                 // sample including outside of edges of image
 198                 if (x1<0 || y1<0) row1= empty;
 199                 else row1= (float *)in->rect_float + in->x * y1 * 4 + 4*x1;
 200
 201                 if (x1<0 || y2>in->y-1) row2= empty;
 202                 else row2= (float *)in->rect_float + in->x * y2 * 4 + 4*x1;
 203
 204                 if (x2>in->x-1 || y1<0) row3= empty;
 205                 else row3= (float *)in->rect_float + in->x * y1 * 4 + 4*x2;
 206
 207                 if (x2>in->x-1 || y2>in->y-1) row4= empty;
 208                 else row4= (float *)in->rect_float + in->x * y2 * 4 + 4*x2;
 209
 210                 a= u-floor(u);
 211                 b= v-floor(v);
 212                 a_b= a*b; ma_b= (1.0f-a)*b; a_mb= a*(1.0f-b); ma_mb= (1.0f-a)*(1.0f-b);
 213
 214                 outF[0]= ma_mb*row1[0] + a_mb*row3[0] + ma_b*row2[0]+ a_b*row4[0];
 215                 outF[1]= ma_mb*row1[1] + a_mb*row3[1] + ma_b*row2[1]+ a_b*row4[1];
 216                 outF[2]= ma_mb*row1[2] + a_mb*row3[2] + ma_b*row2[2]+ a_b*row4[2];
 217                 outF[3]= ma_mb*row1[3] + a_mb*row3[3] + ma_b*row2[3]+ a_b*row4[3];
 218         }
 219         if (do_rect) {
 220                 // sample including outside of edges of image
 221                 if (x1<0 || y1<0) row1I= emptyI;
 222                 else row1I= (unsigned char *)in->rect + in->x * y1 * 4 + 4*x1;
 223
 224                 if (x1<0 || y2>in->y-1) row2I= emptyI;
 225                 else row2I= (unsigned char *)in->rect + in->x * y2 * 4 + 4*x1;
 226
 227                 if (x2>in->x-1 || y1<0) row3I= emptyI;
 228                 else row3I= (unsigned char *)in->rect + in->x * y1 * 4 + 4*x2;
 229
 230                 if (x2>in->x-1 || y2>in->y-1) row4I= emptyI;
 231                 else row4I= (unsigned char *)in->rect + in->x * y2 * 4 + 4*x2;
 232
 233                 a= u-floor(u);
 234                 b= v-floor(v);
 235                 a_b= a*b; ma_b= (1.0f-a)*b; a_mb= a*(1.0f-b); ma_mb= (1.0f-a)*(1.0f-b);
 236
 237                 outI[0]= ma_mb*row1I[0] + a_mb*row3I[0] + ma_b*row2I[0]+ a_b*row4I[0];
 238                 outI[1]= ma_mb*row1I[1] + a_mb*row3I[1] + ma_b*row2I[1]+ a_b*row4I[1];
 239                 outI[2]= ma_mb*row1I[2] + a_mb*row3I[2] + ma_b*row2I[2]+ a_b*row4I[2];
 240                 outI[3]= ma_mb*row1I[3] + a_mb*row3I[3] + ma_b*row2I[3]+ a_b*row4I[3];
 241         }
 242 }
 243
 244 /* function assumes out to be zero'ed, only does RGBA */
 245 /* NEAREST INTERPOLATION */
 246 void neareast_interpolation(ImBuf *in, ImBuf *out, float u, float v,int xout, int yout)
 247 {
 248         float *outF,*dataF;
 249         unsigned char *dataI,*outI;
 250         int y1, x1;
 251         int do_rect, do_float;
 252
 253         if (in==NULL) return;
 254         if (in->rect==NULL && in->rect_float==NULL) return;
 255
 256         do_rect= (out->rect != NULL);
 257         do_float= (out->rect_float != NULL);
 258
 259         x1= (int)(u);
 260         y1= (int)(v);
 261
 262         if (do_rect)
 263                 outI=(unsigned char *)out->rect + out->x * yout * 4 + 4*xout;
 264         else
 265                 outI= NULL;
 266         if (do_float)
 267                 outF=(float *)out->rect_float + out->x * yout * 4 + 4*xout;
 268         else
 269                 outF= NULL;
 270
 271         // sample area entirely outside image?
 272         if (x1<0 || x1>in->x-1 || y1<0 || y1>in->y-1) return;
 273
 274         // sample including outside of edges of image
 275         if (x1<0 || y1<0) {
 276                 if (do_rect) {
 277                         outI[0]= 0;
 278                         outI[1]= 0;
 279                         outI[2]= 0;
 280                         outI[3]= 0;
 281                 }
 282                 if (do_float) {
 283                         outF[0]= 0.0f;
 284                         outF[1]= 0.0f;
 285                         outF[2]= 0.0f;
 286                         outF[3]= 0.0f;
 287                 }
 288         } else {
 289                 dataI= (unsigned char *)in->rect + in->x * y1 * 4 + 4*x1;
 290                 if (do_rect) {
 291                         outI[0]= dataI[0];
 292                         outI[1]= dataI[1];
 293                         outI[2]= dataI[2];
 294                         outI[3]= dataI[3];
 295                 }
 296                 dataF= in->rect_float + in->x * y1 * 4 + 4*x1;
 297                 if (do_float) {
 298                         outF[0]= dataF[0];
 299                         outF[1]= dataF[1];
 300                         outF[2]= dataF[2];
 301                         outF[3]= dataF[3];
 302                 }
 303         }
 304 }