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