gfx/skia/trunk/include/effects/SkPorterDuff.h@129ffea94266
gfx/skia/trunk/include/effects/SkPorterDuff.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.
1 /*
2 * Copyright 2006 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
8 #ifndef SkPorterDuff_DEFINED
9 #define SkPorterDuff_DEFINED
11 #include "SkColor.h"
12 #include "SkXfermode.h"
14 class SkXfermode;
16 class SK_API SkPorterDuff {
17 public:
18 /** List of predefined xfermodes. In general, the algebra for the modes
19 uses the following symbols:
20 Sa, Sc - source alpha and color
21 Da, Dc - destination alpha and color (before compositing)
22 [a, c] - Resulting (alpha, color) values
23 For these equations, the colors are in premultiplied state.
24 If no xfermode is specified, kSrcOver is assumed.
25 */
26 enum Mode {
27 kClear_Mode, //!< [0, 0]
28 kSrc_Mode, //!< [Sa, Sc]
29 kDst_Mode, //!< [Da, Dc]
30 kSrcOver_Mode, //!< [Sa + Da - Sa*Da, Rc = Sc + (1 - Sa)*Dc]
31 kDstOver_Mode, //!< [Sa + Da - Sa*Da, Rc = Dc + (1 - Da)*Sc]
32 kSrcIn_Mode, //!< [Sa * Da, Sc * Da]
33 kDstIn_Mode, //!< [Sa * Da, Sa * Dc]
34 kSrcOut_Mode, //!< [Sa * (1 - Da), Sc * (1 - Da)]
35 kDstOut_Mode, //!< [Da * (1 - Sa), Dc * (1 - Sa)]
36 kSrcATop_Mode, //!< [Da, Sc * Da + (1 - Sa) * Dc]
37 kDstATop_Mode, //!< [Sa, Sa * Dc + Sc * (1 - Da)]
38 kXor_Mode, //!< [Sa + Da - 2 * Sa * Da, Sc * (1 - Da) + (1 - Sa) * Dc]
39 kDarken_Mode, //!< [Sa + Da - Sa*Da, Sc*(1 - Da) + Dc*(1 - Sa) + min(Sc, Dc)]
40 kLighten_Mode, //!< [Sa + Da - Sa*Da, Sc*(1 - Da) + Dc*(1 - Sa) + max(Sc, Dc)]
41 kModulate_Mode, //!< [Sa * Da, Sc * Dc] multiplies all components
42 kScreen_Mode, //!< [Sa + Da - Sa * Da, Sc + Dc - Sc * Dc]
43 kAdd_Mode, //!< Saturate(S + D)
44 #ifdef SK_BUILD_FOR_ANDROID
45 kOverlay_Mode,
46 #endif
48 kModeCount
49 };
51 /** Return an SkXfermode object for the specified mode.
52 */
53 static SkXfermode* CreateXfermode(Mode mode);
55 /** Return a function pointer to a routine that applies the specified
56 porter-duff transfer mode.
57 */
58 static SkXfermodeProc GetXfermodeProc(Mode mode);
60 /** Return a function pointer to a routine that applies the specified
61 porter-duff transfer mode and srcColor to a 16bit device color. Note,
62 if the mode+srcColor might return a non-opaque color, then there is not
63 16bit proc, and this will return NULL.
64 */
65 static SkXfermodeProc16 GetXfermodeProc16(Mode mode, SkColor srcColor);
67 /** If the specified xfermode advertises itself as one of the porterduff
68 modes (via SkXfermode::Coeff), return true and if not null, set mode
69 to the corresponding porterduff mode. If it is not recognized as a one,
70 return false and ignore the mode parameter.
71 */
72 static bool IsMode(SkXfermode*, Mode* mode);
74 /** Return the corersponding SkXfermode::Mode
75 */
76 static SkXfermode::Mode ToXfermodeMode(Mode);
77 } SK_ATTR_DEPRECATED("use SkXfermode::Mode");
79 #endif
