9fa60daad4
Refactoring pattern: 1. guard the existing constructor(readbuffer) with the legacy build-flag 2. If you are a instancable subclass, implement CreateProc(readbuffer) to create a new instances from the buffer params (or return NULL). If you're a shader subclass 1. You must read/write the local matrix if your class accepts that in its factory/constructor, else ignore it. R=robertphillips@google.com, mtklein@google.com, senorblanco@google.com, senorblanco@chromium.org, sugoi@chromium.org Author: reed@google.com Review URL: https://codereview.chromium.org/395603002
72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
/*
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* Copyright 2006 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkAvoidXfermode_DEFINED
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#define SkAvoidXfermode_DEFINED
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#include "SkXfermode.h"
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/** \class SkAvoidXfermode
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This xfermode will draw the src everywhere except on top of the specified
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color.
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*/
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class SK_API SkAvoidXfermode : public SkXfermode {
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public:
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enum Mode {
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kAvoidColor_Mode, //!< draw everywhere except on the opColor
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kTargetColor_Mode //!< draw only on top of the opColor
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};
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/** This xfermode draws, or doesn't draw, based on the destination's
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distance from an op-color.
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There are two modes, and each mode interprets a tolerance value.
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Avoid: In this mode, drawing is allowed only on destination pixels that
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are different from the op-color.
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Tolerance near 0: avoid any colors even remotely similar to the op-color
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Tolerance near 255: avoid only colors nearly identical to the op-color
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Target: In this mode, drawing only occurs on destination pixels that
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are similar to the op-color
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Tolerance near 0: draw only on colors that are nearly identical to the op-color
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Tolerance near 255: draw on any colors even remotely similar to the op-color
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*/
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static SkAvoidXfermode* Create(SkColor opColor, U8CPU tolerance, Mode mode) {
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return SkNEW_ARGS(SkAvoidXfermode, (opColor, tolerance, mode));
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}
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// overrides from SkXfermode
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virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
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const SkAlpha aa[]) const SK_OVERRIDE;
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virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count,
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const SkAlpha aa[]) const SK_OVERRIDE;
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virtual void xferA8(SkAlpha dst[], const SkPMColor src[], int count,
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const SkAlpha aa[]) const SK_OVERRIDE;
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SK_TO_STRING_OVERRIDE()
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SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkAvoidXfermode)
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protected:
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SkAvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode);
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#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
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explicit SkAvoidXfermode(SkReadBuffer&);
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#endif
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virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
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private:
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SkColor fOpColor;
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uint32_t fDistMul; // x.14 cached from fTolerance
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uint8_t fTolerance;
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Mode fMode;
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typedef SkXfermode INHERITED;
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};
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#endif
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