gfx/skia/trunk/include/core/SkUnPreMultiply.h@129ffea94266 (annotated)
gfx/skia/trunk/include/core/SkUnPreMultiply.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 | |
| michael@0 | 2 | /* |
| michael@0 | 3 | * Copyright 2008 The Android Open Source Project |
| michael@0 | 4 | * |
| michael@0 | 5 | * Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 6 | * found in the LICENSE file. |
| michael@0 | 7 | */ |
| michael@0 | 8 | |
| michael@0 | 9 | |
| michael@0 | 10 | |
| michael@0 | 11 | |
| michael@0 | 12 | |
| michael@0 | 13 | #ifndef SkUnPreMultiply_DEFINED |
| michael@0 | 14 | #define SkUnPreMultiply_DEFINED |
| michael@0 | 15 | |
| michael@0 | 16 | #include "SkColor.h" |
| michael@0 | 17 | |
| michael@0 | 18 | class SK_API SkUnPreMultiply { |
| michael@0 | 19 | public: |
| michael@0 | 20 | typedef uint32_t Scale; |
| michael@0 | 21 | |
| michael@0 | 22 | // index this table with alpha [0..255] |
| michael@0 | 23 | static const Scale* GetScaleTable() { |
| michael@0 | 24 | return gTable; |
| michael@0 | 25 | } |
| michael@0 | 26 | |
| michael@0 | 27 | static Scale GetScale(U8CPU alpha) { |
| michael@0 | 28 | SkASSERT(alpha <= 255); |
| michael@0 | 29 | return gTable[alpha]; |
| michael@0 | 30 | } |
| michael@0 | 31 | |
| michael@0 | 32 | /** Usage: |
| michael@0 | 33 | |
| michael@0 | 34 | const Scale* table = SkUnPreMultiply::GetScaleTable(); |
| michael@0 | 35 | |
| michael@0 | 36 | for (...) { |
| michael@0 | 37 | unsigned a = ... |
| michael@0 | 38 | SkUnPreMultiply::Scale scale = table[a]; |
| michael@0 | 39 | |
| michael@0 | 40 | red = SkUnPreMultiply::ApplyScale(scale, red); |
| michael@0 | 41 | ... |
| michael@0 | 42 | // now red is unpremultiplied |
| michael@0 | 43 | } |
| michael@0 | 44 | */ |
| michael@0 | 45 | static U8CPU ApplyScale(Scale scale, U8CPU component) { |
| michael@0 | 46 | SkASSERT(component <= 255); |
| michael@0 | 47 | return (scale * component + (1 << 23)) >> 24; |
| michael@0 | 48 | } |
| michael@0 | 49 | |
| michael@0 | 50 | static SkColor PMColorToColor(SkPMColor c); |
| michael@0 | 51 | |
| michael@0 | 52 | static uint32_t UnPreMultiplyPreservingByteOrder(SkPMColor c); |
| michael@0 | 53 | |
| michael@0 | 54 | private: |
| michael@0 | 55 | static const uint32_t gTable[256]; |
| michael@0 | 56 | }; |
| michael@0 | 57 | |
| michael@0 | 58 | #endif |
