Inverts the colours in the image
| 333 | |
| 334 | //! Inverts the colours in the image |
| 335 | ILboolean ILAPIENTRY iluNegative() |
| 336 | { |
| 337 | ILuint i, j, c, *IntPtr, NumPix, Bpp; |
| 338 | ILubyte *Data; |
| 339 | ILushort *ShortPtr; |
| 340 | ILubyte *RegionMask; |
| 341 | |
| 342 | iluCurImage = ilGetCurImage(); |
| 343 | if (iluCurImage == NULL) { |
| 344 | ilSetError(ILU_ILLEGAL_OPERATION); |
| 345 | return IL_FALSE; |
| 346 | } |
| 347 | |
| 348 | if (iluCurImage->Format == IL_COLOUR_INDEX) { |
| 349 | if (!iluCurImage->Pal.Palette || !iluCurImage->Pal.PalSize || iluCurImage->Pal.PalType == IL_PAL_NONE) { |
| 350 | ilSetError(ILU_ILLEGAL_OPERATION); |
| 351 | return IL_FALSE; |
| 352 | } |
| 353 | Data = iluCurImage->Pal.Palette; |
| 354 | i = iluCurImage->Pal.PalSize; |
| 355 | } |
| 356 | else { |
| 357 | Data = iluCurImage->Data; |
| 358 | i = iluCurImage->SizeOfData; |
| 359 | } |
| 360 | |
| 361 | RegionMask = iScanFill(); |
| 362 | |
| 363 | // @TODO: Optimize this some. |
| 364 | |
| 365 | NumPix = i / iluCurImage->Bpc; |
| 366 | Bpp = iluCurImage->Bpp; |
| 367 | |
| 368 | if (RegionMask) { |
| 369 | switch (iluCurImage->Bpc) |
| 370 | { |
| 371 | case 1: |
| 372 | for (j = 0, i = 0; j < NumPix; j += Bpp, i++, Data += Bpp) { |
| 373 | for (c = 0; c < Bpp; c++) { |
| 374 | if (RegionMask[i]) |
| 375 | *(Data+c) = ~*(Data+c); |
| 376 | } |
| 377 | } |
| 378 | break; |
| 379 | |
| 380 | case 2: |
| 381 | ShortPtr = (ILushort*)Data; |
| 382 | for (j = 0, i = 0; j < NumPix; j += Bpp, i++, ShortPtr += Bpp) { |
| 383 | for (c = 0; c < Bpp; c++) { |
| 384 | if (RegionMask[i]) |
| 385 | *(ShortPtr+c) = ~*(ShortPtr+c); |
| 386 | } |
| 387 | } |
| 388 | break; |
| 389 | |
| 390 | case 4: |
| 391 | IntPtr = (ILuint*)Data; |
| 392 | for (j = 0, i = 0; j < NumPix; j += Bpp, i++, IntPtr += Bpp) { |
nothing calls this directly
no test coverage detected