| #ifndef SkBitmapProcState_utils_DEFINED |

| #define SkBitmapProcState_utils_DEFINED |

| |

| // Helper to ensure that when we shift down, we do it w/o sign-extension |

| // so the caller doesn't have to manually mask off the top 16 bits |

| // |

| static unsigned SK_USHIFT16(unsigned x) { |

| return x >> 16; |

| } |

| |

| /* |

| * The decal_ functions require that |

| * 1. dx > 0 |

| * 2. [fx, fx+dx, fx+2dx, fx+3dx, ... fx+(count-1)dx] are all <= maxX |

| * |

| * In addition, we use SkFractionalInt to keep more fractional precision than |

| * just SkFixed, so we will abort the decal_ call if dx is very small, since |

| * the decal_ function just operates on SkFixed. If that were changed, we could |

| * skip the very_small test here. |

| */ |

| static inline bool can_truncate_to_fixed_for_decal(SkFractionalInt frX, |

| SkFractionalInt frDx, |

| int count, unsigned max) { |

| SkFixed dx = SkFractionalIntToFixed(frDx); |

| |

| // if decal_ kept SkFractionalInt precision, this would just be dx <= 0 |

| // I just made up the 1/256. Just don't want to perceive accumulated error |

| // if we truncate frDx and lose its low bits. |

| if (dx <= SK_Fixed1 / 256) { |

| return false; |

| } |

| |

| // We cast to unsigned so we don't have to check for negative values, which |

| // will now appear as very large positive values, and thus fail our test! |

| SkFixed fx = SkFractionalIntToFixed(frX); |

| return (unsigned)SkFixedFloorToInt(fx) <= max && |

| (unsigned)SkFixedFloorToInt(fx + dx * (count - 1)) < max; |

| } |

| |

| #endif /* #ifndef SkBitmapProcState_utils_DEFINED */ |