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/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SkAvoidXfermode_DEFINED
#define SkAvoidXfermode_DEFINED
#include "SkXfermode.h"
/** \class SkAvoidXfermode
This xfermode will draw the src everywhere except on top of the specified
color.
*/
class SkAvoidXfermode : public SkXfermode {
public:
enum Mode {
kAvoidColor_Mode, //!< draw everywhere except on the opColor
kTargetColor_Mode //!< draw only on top of the opColor
};
/** This xfermode will draw the src everywhere except on top of the opColor
or, depending on the Mode, draw only on top of the opColor.
@param opColor the color to avoid (or to target depending on Mode).
note: the alpha in opColor is ignored
@param tolerance How closely we compare a pixel to the opColor.
0 - only operate if exact match
255 - maximum gradation (blending) based on how
similar the pixel is to our opColor (max tolerance)
@param mode If we should avoid or target the opColor
*/
SkAvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode);
// overrides from SkXfermode
virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
const SkAlpha aa[]);
virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count,
const SkAlpha aa[]);
virtual void xfer4444(uint16_t dst[], const SkPMColor src[], int count,
const SkAlpha aa[]);
virtual void xferA8(SkAlpha dst[], const SkPMColor src[], int count,
const SkAlpha aa[]);
// overrides from SkFlattenable
virtual Factory getFactory();
virtual void flatten(SkFlattenableWriteBuffer&);
protected:
SkAvoidXfermode(SkFlattenableReadBuffer&);
private:
SkColor fOpColor;
uint32_t fDistMul; // x.14
Mode fMode;
static SkFlattenable* Create(SkFlattenableReadBuffer&);
typedef SkXfermode INHERITED;
};
#endif
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