6806fe87e0
So this works in shared_library build in chromium. This issue was raised up in the following chromium-dev thread: https://groups.google.com/a/chromium.org/forum/?hl=en&fromgroups=#!topic/chromium-dev/Z6qzEw8MwVY R=epoger@google.com,tomhudson@google.com Review URL: https://codereview.appspot.com/6601065 git-svn-id: http://skia.googlecode.com/svn/trunk@5914 2bbb7eff-a529-9590-31e7-b0007b416f81
82 lines
2.9 KiB
C++
82 lines
2.9 KiB
C++
/*
|
|
* Copyright 2006 The Android Open Source Project
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#ifndef SkPorterDuff_DEFINED
|
|
#define SkPorterDuff_DEFINED
|
|
|
|
#include "SkColor.h"
|
|
#include "SkXfermode.h"
|
|
|
|
class SkXfermode;
|
|
|
|
/** DEPRECATED - use SkXfermode::Mode instead
|
|
*/
|
|
class SK_API SkPorterDuff {
|
|
public:
|
|
/** List of predefined xfermodes. In general, the algebra for the modes
|
|
uses the following symbols:
|
|
Sa, Sc - source alpha and color
|
|
Da, Dc - destination alpha and color (before compositing)
|
|
[a, c] - Resulting (alpha, color) values
|
|
For these equations, the colors are in premultiplied state.
|
|
If no xfermode is specified, kSrcOver is assumed.
|
|
*/
|
|
enum Mode {
|
|
kClear_Mode, //!< [0, 0]
|
|
kSrc_Mode, //!< [Sa, Sc]
|
|
kDst_Mode, //!< [Da, Dc]
|
|
kSrcOver_Mode, //!< [Sa + Da - Sa*Da, Rc = Sc + (1 - Sa)*Dc]
|
|
kDstOver_Mode, //!< [Sa + Da - Sa*Da, Rc = Dc + (1 - Da)*Sc]
|
|
kSrcIn_Mode, //!< [Sa * Da, Sc * Da]
|
|
kDstIn_Mode, //!< [Sa * Da, Sa * Dc]
|
|
kSrcOut_Mode, //!< [Sa * (1 - Da), Sc * (1 - Da)]
|
|
kDstOut_Mode, //!< [Da * (1 - Sa), Dc * (1 - Sa)]
|
|
kSrcATop_Mode, //!< [Da, Sc * Da + (1 - Sa) * Dc]
|
|
kDstATop_Mode, //!< [Sa, Sa * Dc + Sc * (1 - Da)]
|
|
kXor_Mode, //!< [Sa + Da - 2 * Sa * Da, Sc * (1 - Da) + (1 - Sa) * Dc]
|
|
kDarken_Mode, //!< [Sa + Da - Sa*Da, Sc*(1 - Da) + Dc*(1 - Sa) + min(Sc, Dc)]
|
|
kLighten_Mode, //!< [Sa + Da - Sa*Da, Sc*(1 - Da) + Dc*(1 - Sa) + max(Sc, Dc)]
|
|
kMultiply_Mode, //!< [Sa * Da, Sc * Dc]
|
|
kScreen_Mode, //!< [Sa + Da - Sa * Da, Sc + Dc - Sc * Dc]
|
|
kAdd_Mode, //!< Saturate(S + D)
|
|
#ifdef SK_BUILD_FOR_ANDROID
|
|
kOverlay_Mode,
|
|
#endif
|
|
|
|
kModeCount
|
|
};
|
|
|
|
/** Return an SkXfermode object for the specified mode.
|
|
*/
|
|
static SkXfermode* CreateXfermode(Mode mode);
|
|
|
|
/** Return a function pointer to a routine that applies the specified
|
|
porter-duff transfer mode.
|
|
*/
|
|
static SkXfermodeProc GetXfermodeProc(Mode mode);
|
|
|
|
/** Return a function pointer to a routine that applies the specified
|
|
porter-duff transfer mode and srcColor to a 16bit device color. Note,
|
|
if the mode+srcColor might return a non-opaque color, then there is not
|
|
16bit proc, and this will return NULL.
|
|
*/
|
|
static SkXfermodeProc16 GetXfermodeProc16(Mode mode, SkColor srcColor);
|
|
|
|
/** If the specified xfermode advertises itself as one of the porterduff
|
|
modes (via SkXfermode::Coeff), return true and if not null, set mode
|
|
to the corresponding porterduff mode. If it is not recognized as a one,
|
|
return false and ignore the mode parameter.
|
|
*/
|
|
static bool IsMode(SkXfermode*, Mode* mode);
|
|
|
|
/** Return the corersponding SkXfermode::Mode
|
|
*/
|
|
static SkXfermode::Mode ToXfermodeMode(Mode);
|
|
};
|
|
|
|
#endif
|