mirror of https://github.com/axmolengine/axmol.git
83 lines
3.0 KiB
C
83 lines
3.0 KiB
C
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/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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 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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SkAvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode);
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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[]);
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virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count,
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const SkAlpha aa[]);
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virtual void xfer4444(uint16_t dst[], const SkPMColor src[], int count,
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const SkAlpha aa[]);
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virtual void xferA8(SkAlpha dst[], const SkPMColor src[], int count,
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const SkAlpha aa[]);
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// overrides from SkFlattenable
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virtual Factory getFactory();
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virtual void flatten(SkFlattenableWriteBuffer&);
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static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
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return SkNEW_ARGS(SkAvoidXfermode, (buffer));
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}
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protected:
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SkAvoidXfermode(SkFlattenableReadBuffer&);
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private:
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SkColor fOpColor;
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uint32_t fDistMul; // x.14
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Mode fMode;
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static SkFlattenable* Create(SkFlattenableReadBuffer&);
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typedef SkXfermode INHERITED;
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};
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#endif
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