gfx/skia/trunk/src/core/SkBitmapProcState_utils.h@129ffea94266 (annotated)
gfx/skia/trunk/src/core/SkBitmapProcState_utils.h
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
| michael@0 | 1 | #ifndef SkBitmapProcState_utils_DEFINED |
| michael@0 | 2 | #define SkBitmapProcState_utils_DEFINED |
| michael@0 | 3 | |
| michael@0 | 4 | // Helper to ensure that when we shift down, we do it w/o sign-extension |
| michael@0 | 5 | // so the caller doesn't have to manually mask off the top 16 bits |
| michael@0 | 6 | // |
| michael@0 | 7 | static unsigned SK_USHIFT16(unsigned x) { |
| michael@0 | 8 | return x >> 16; |
| michael@0 | 9 | } |
| michael@0 | 10 | |
| michael@0 | 11 | /* |
| michael@0 | 12 | * The decal_ functions require that |
| michael@0 | 13 | * 1. dx > 0 |
| michael@0 | 14 | * 2. [fx, fx+dx, fx+2dx, fx+3dx, ... fx+(count-1)dx] are all <= maxX |
| michael@0 | 15 | * |
| michael@0 | 16 | * In addition, we use SkFractionalInt to keep more fractional precision than |
| michael@0 | 17 | * just SkFixed, so we will abort the decal_ call if dx is very small, since |
| michael@0 | 18 | * the decal_ function just operates on SkFixed. If that were changed, we could |
| michael@0 | 19 | * skip the very_small test here. |
| michael@0 | 20 | */ |
| michael@0 | 21 | static inline bool can_truncate_to_fixed_for_decal(SkFractionalInt frX, |
| michael@0 | 22 | SkFractionalInt frDx, |
| michael@0 | 23 | int count, unsigned max) { |
| michael@0 | 24 | SkFixed dx = SkFractionalIntToFixed(frDx); |
| michael@0 | 25 | |
| michael@0 | 26 | // if decal_ kept SkFractionalInt precision, this would just be dx <= 0 |
| michael@0 | 27 | // I just made up the 1/256. Just don't want to perceive accumulated error |
| michael@0 | 28 | // if we truncate frDx and lose its low bits. |
| michael@0 | 29 | if (dx <= SK_Fixed1 / 256) { |
| michael@0 | 30 | return false; |
| michael@0 | 31 | } |
| michael@0 | 32 | |
| michael@0 | 33 | // We cast to unsigned so we don't have to check for negative values, which |
| michael@0 | 34 | // will now appear as very large positive values, and thus fail our test! |
| michael@0 | 35 | SkFixed fx = SkFractionalIntToFixed(frX); |
| michael@0 | 36 | return (unsigned)SkFixedFloorToInt(fx) <= max && |
| michael@0 | 37 | (unsigned)SkFixedFloorToInt(fx + dx * (count - 1)) < max; |
| michael@0 | 38 | } |
| michael@0 | 39 | |
| michael@0 | 40 | #endif /* #ifndef SkBitmapProcState_utils_DEFINED */ |
