lib/gdi/gpixmap.cpp

   1 #include <lib/gdi/gpixmap.h>
   2 #include <lib/gdi/region.h>
   3
   4 gLookup::gLookup()
   5         :size(0), lookup(0)
   6 {
   7 }
   8
   9 gLookup::gLookup(int size, const gPalette &pal, const gRGB &start, const gRGB &end)
  10         :size(0), lookup(0)
  11 {
  12         build(size, pal, start, end);
  13 }
  14
  15 void gLookup::build(int _size, const gPalette &pal, const gRGB &start, const gRGB &end)
  16 {
  17         if (lookup)
  18         {
  19                 delete [] lookup;
  20                 lookup=0;
  21                 size=0;
  22         }
  23         size=_size;
  24         if (!size)
  25                 return;
  26         lookup=new gColor[size];
  27
  28         for (int i=0; i<size; i++)
  29         {
  30                 gRGB col;
  31                 if (i)
  32                 {
  33                         int rdiff=-start.r+end.r;
  34                         int gdiff=-start.g+end.g;
  35                         int bdiff=-start.b+end.b;
  36                         int adiff=-start.a+end.a;
  37                         rdiff*=i; rdiff/=(size-1);
  38                         gdiff*=i; gdiff/=(size-1);
  39                         bdiff*=i; bdiff/=(size-1);
  40                         adiff*=i; adiff/=(size-1);
  41                         col.r=start.r+rdiff;
  42                         col.g=start.g+gdiff;
  43                         col.b=start.b+bdiff;
  44                         col.a=start.a+adiff;
  45                 } else
  46                         col=start;
  47                 lookup[i]=pal.findColor(col);
  48         }
  49 }
  50
  51 gSurface::~gSurface()
  52 {
  53 }
  54
  55 gSurfaceSystem::gSurfaceSystem(eSize size, int _bpp)
  56 {
  57         x=size.width();
  58         y=size.height();
  59         bpp=_bpp;
  60         switch (bpp)
  61         {
  62         case 8:
  63                 bypp=1;
  64                 break;
  65         case 15:
  66         case 16:
  67                 bypp=2;
  68                 break;
  69         case 24:                // never use 24bit mode
  70         case 32:
  71                 bypp=4;
  72                 break;
  73         default:
  74                 bypp=(bpp+7)/8;
  75         }
  76         stride=x*bypp;
  77         clut.colors=0;
  78         clut.data=0;
  79         data=malloc(x*y*bypp);
  80 }
  81
  82 gSurfaceSystem::~gSurfaceSystem()
  83 {
  84         free(data);
  85         delete[] clut.data;
  86 }
  87
  88 gPixmap *gPixmap::lock()
  89 {
  90         contentlock.lock(1);
  91         return this;
  92 }
  93
  94 void gPixmap::unlock()
  95 {
  96         contentlock.unlock(1);
  97 }
  98
  99 void gPixmap::fill(const gRegion &region, const gColor &color)
 100 {
 101         unsigned int i;
 102         for (i=0; i<region.rects.size(); ++i)
 103         {
 104                 const eRect &area = region.rects[i];
 105                 if ((area.height()<=0) || (area.width()<=0))
 106                         continue;
 107                 if (surface->bpp == 8)
 108                 {
 109                         for (int y=area.top(); y<area.bottom(); y++)
 110                                 memset(((__u8*)surface->data)+y*surface->stride+area.left(), color.color, area.width());
 111                 } else if (surface->bpp == 32)
 112                         for (int y=area.top(); y<area.bottom(); y++)
 113                         {
 114                                 __u32 *dst=(__u32*)(((__u8*)surface->data)+y*surface->stride+area.left()*surface->bypp);
 115                                 int x=area.width();
 116                                 __u32 col;
 117
 118                                 if (surface->clut.data && color < surface->clut.colors)
 119                                         col=(surface->clut.data[color].a<<24)|(surface->clut.data[color].r<<16)|(surface->clut.data[color].g<<8)|(surface->clut.data[color].b);
 120                                 else
 121                                         col=0x10101*color;
 122                                 col^=0xFF000000;
 123                                 while (x--)
 124                                         *dst++=col;
 125                         }
 126                 else
 127                         eWarning("couldn't fill %d bpp", surface->bpp);
 128         }
 129 }
 130
 131 void gPixmap::blit(const gPixmap &src, ePoint pos, const gRegion &clip, int flag)
 132 {
 133         for (unsigned int i=0; i<clip.rects.size(); ++i)
 134         {
 135                 eRect area=eRect(pos, src.size());
 136                 area&=clip.rects[i];
 137                 area&=eRect(ePoint(0, 0), size());
 138                 if ((area.width()<0) || (area.height()<0))
 139                         continue;
 140
 141                 eRect srcarea=area;
 142                 srcarea.moveBy(-pos.x(), -pos.y());
 143
 144                 if ((surface->bpp == 8) && (src.surface->bpp==8))
 145                 {
 146                         __u8 *srcptr=(__u8*)src.surface->data;
 147                         __u8 *dstptr=(__u8*)surface->data;
 148
 149                         srcptr+=srcarea.left()*src.surface->bypp+srcarea.top()*src.surface->stride;
 150                         dstptr+=area.left()*surface->bypp+area.top()*surface->stride;
 151                         for (int y=0; y<area.height(); y++)
 152                         {
 153                                 if (flag & blitAlphaTest)
 154                                 {
 155                       // no real alphatest yet
 156                                         int width=area.width();
 157                                         unsigned char *src=(unsigned char*)srcptr;
 158                                         unsigned char *dst=(unsigned char*)dstptr;
 159                                                 // use duff's device here!
 160                                         while (width--)
 161                                         {
 162                                                 if (!*src)
 163                                                 {
 164                                                         src++;
 165                                                         dst++;
 166                                                 } else
 167                                                         *dst++=*src++;
 168                                         }
 169                                 } else
 170                                         memcpy(dstptr, srcptr, area.width()*surface->bypp);
 171                                 srcptr+=src.surface->stride;
 172                                 dstptr+=surface->stride;
 173                         }
 174                 } else if ((surface->bpp == 32) && (src.surface->bpp==8))
 175                 {
 176                         __u8 *srcptr=(__u8*)src.surface->data;
 177                         __u8 *dstptr=(__u8*)surface->data; // !!
 178                         __u32 pal[256];
 179
 180                         for (int i=0; i<256; ++i)
 181                         {
 182                                 if (src.surface->clut.data && (i<src.surface->clut.colors))
 183                                         pal[i]=(src.surface->clut.data[i].a<<24)|(src.surface->clut.data[i].r<<16)|(src.surface->clut.data[i].g<<8)|(src.surface->clut.data[i].b);
 184                                 else
 185                                         pal[i]=0x010101*i;
 186                                 pal[i]^=0xFF000000;
 187                         }
 188
 189                         srcptr+=srcarea.left()*src.surface->bypp+srcarea.top()*src.surface->stride;
 190                         dstptr+=area.left()*surface->bypp+area.top()*surface->stride;
 191                         for (int y=0; y<area.height(); y++)
 192                         {
 193                                 if (flag & blitAlphaTest)
 194                                 {
 195                       // no real alphatest yet
 196                                         int width=area.width();
 197                                         unsigned char *src=(unsigned char*)srcptr;
 198                                         __u32 *dst=(__u32*)dstptr;
 199                                                 // use duff's device here!
 200                                         while (width--)
 201                                         {
 202                                                 if (!*src)
 203                                                 {
 204                                                         src++;
 205                                                         dst++;
 206                                                 } else
 207                                                         *dst++=pal[*src++];
 208                                         }
 209                                 } else
 210                                 {
 211                                         int width=area.width();
 212                                         unsigned char *src=(unsigned char*)srcptr;
 213                                         __u32 *dst=(__u32*)dstptr;
 214                                         while (width--)
 215                                                 *dst++=pal[*src++];
 216                                 }
 217                                 srcptr+=src.surface->stride;
 218                                 dstptr+=surface->stride;
 219                         }
 220                 } else
 221                         eFatal("cannot blit %dbpp from %dbpp", surface->bpp, src.surface->bpp);
 222         }
 223 }
 224
 225 void gPixmap::mergePalette(const gPixmap &target)
 226 {
 227         if ((!surface->clut.colors) || (!target.surface->clut.colors))
 228                 return;
 229
 230         gColor *lookup=new gColor[surface->clut.colors];
 231
 232         for (int i=0; i<surface->clut.colors; i++)
 233                 lookup[i].color=target.surface->clut.findColor(surface->clut.data[i]);
 234
 235         delete [] surface->clut.data;
 236         surface->clut.colors=target.surface->clut.colors;
 237         surface->clut.data=new gRGB[surface->clut.colors];
 238         memcpy(surface->clut.data, target.surface->clut.data, sizeof(gRGB)*surface->clut.colors);
 239
 240         __u8 *dstptr=(__u8*)surface->data;
 241
 242         for (int ay=0; ay<surface->y; ay++)
 243         {
 244                 for (int ax=0; ax<surface->x; ax++)
 245                         dstptr[ax]=lookup[dstptr[ax]];
 246                 dstptr+=surface->stride;
 247         }
 248
 249         delete [] lookup;
 250 }
 251
 252 static inline int sgn(int a)
 253 {
 254         if (a < 0)
 255                 return -1;
 256         else if (!a)
 257                 return 0;
 258         else
 259                 return 1;
 260 }
 261
 262 void gPixmap::line(const gRegion &clip, ePoint start, ePoint dst, gColor color)
 263 {
 264         __u8 *srf8 = 0;
 265         __u32 *srf32 = 0;
 266         int stride = surface->stride;
 267
 268         if (clip.rects.empty())
 269                 return;
 270
 271         __u32 col;
 272         if (surface->bpp == 8)
 273         {
 274                 srf8 = (__u8*)surface->data;
 275         } else if (surface->bpp == 32)
 276         {
 277                 srf32 = (__u32*)surface->data;
 278
 279                 if (surface->clut.data && color < surface->clut.colors)
 280                         col=(surface->clut.data[color].a<<24)|(surface->clut.data[color].r<<16)|(surface->clut.data[color].g<<8)|(surface->clut.data[color].b);
 281                 else
 282                         col=0x10101*color;
 283                 col^=0xFF000000;
 284         }
 285
 286         int xa = start.x(), ya = start.y(), xb = dst.x(), yb = dst.y();
 287         int dx, dy, x, y, s1, s2, e, temp, swap, i;
 288         dy=abs(yb-ya);
 289         dx=abs(xb-xa);
 290         s1=sgn(xb-xa);
 291         s2=sgn(yb-ya);
 292         x=xa;
 293         y=ya;
 294         if (dy>dx)
 295         {
 296                 temp=dx;
 297                 dx=dy;
 298                 dy=temp;
 299                 swap=1;
 300         } else
 301                 swap=0;
 302         e = 2*dy-dx;
 303
 304         int lasthit = 0;
 305         for(i=1; i<=dx; i++)
 306         {
 307                                 /* i don't like this clipping loop, but the only */
 308                                 /* other choice i see is to calculate the intersections */
 309                                 /* before iterating through the pixels. */
 310
 311                                 /* one could optimize this because of the ordering */
 312                                 /* of the bands. */
 313
 314                 lasthit = 0;
 315                 int a = lasthit;
 316
 317                         /* if last pixel was invisble, first check bounding box */
 318                 if (a == -1)
 319                 {
 320                                 /* check if we just got into the bbox again */
 321                         if (clip.extends.contains(x, y))
 322                                 lasthit = a = 0;
 323                         else
 324                                 goto fail;
 325                 } else if (!clip.rects[a].contains(x, y))
 326                 {
 327                         do
 328                         {
 329                                 ++a;
 330                                 if (a == clip.rects.size())
 331                                         a = 0;
 332                                 if (a == lasthit)
 333                                 {
 334                                         goto fail;
 335                                         lasthit = -1;
 336                                 }
 337                         } while (!clip.rects[a].contains(x, y));
 338                         lasthit = a;
 339                 }
 340
 341                 if (srf8)
 342                         srf8[y * stride + x] = color;
 343                 if (srf32)
 344                         srf32[y * stride/4 + x] = col;
 345 fail:
 346                 while (e>=0)
 347                 {
 348                         if (swap==1) x+=s1;
 349                         else y+=s2;
 350                         e-=2*dx;
 351                 }
 352     if (swap==1)
 353         y+=s2;
 354                 else
 355                         x+=s1;
 356                 e+=2*dy;
 357         }
 358 }
 359
 360 gColor gPalette::findColor(const gRGB &rgb) const
 361 {
 362         int difference=1<<30, best_choice=0;
 363         for (int t=0; t<colors; t++)
 364         {
 365                 int ttd;
 366                 int td=(signed)(rgb.r-data[t].r); td*=td; td*=(255-data[t].a);
 367                 ttd=td;
 368                 if (ttd>=difference)
 369                         continue;
 370                 td=(signed)(rgb.g-data[t].g); td*=td; td*=(255-data[t].a);
 371                 ttd+=td;
 372                 if (ttd>=difference)
 373                         continue;
 374                 td=(signed)(rgb.b-data[t].b); td*=td; td*=(255-data[t].a);
 375                 ttd+=td;
 376                 if (ttd>=difference)
 377                         continue;
 378                 td=(signed)(rgb.a-data[t].a); td*=td; td*=255;
 379                 ttd+=td;
 380                 if (ttd>=difference)
 381                         continue;
 382                 if (!ttd)
 383                         return t;
 384                 difference=ttd;
 385                 best_choice=t;
 386         }
 387         return best_choice;
 388 }
 389
 390 DEFINE_REF(gPixmap);
 391
 392 gPixmap::~gPixmap()
 393 {
 394 }
 395
 396 gPixmap::gPixmap(gSurface *surface): surface(surface)
 397 {
 398 }
 399
 400 gPixmap::gPixmap(eSize size, int bpp)
 401 {
 402         surface = new gSurfaceSystem(size, bpp);
 403 }
 404