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/*
* Copyright (C) 2008 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 SkBlurDrawLooper_DEFINED
#define SkBlurDrawLooper_DEFINED
#include "SkDrawLooper.h"
#include "SkColor.h"
class SkMaskFilter;
/** \class SkBlurDrawLooper
This class draws a shadow of the object (possibly offset), and then draws
the original object in its original position.
should there be an option to just draw the shadow/blur layer? webkit?
*/
class SkBlurDrawLooper : public SkDrawLooper {
public:
enum BlurFlags {
kNone_BlurFlag = 0x00,
/**
The blur layer's dx/dy/radius aren't affected by the canvas
transform.
*/
kIgnoreTransform_BlurFlag = 0x01,
/** mask for all blur flags */
kAll_BlurFlag = 0x01
};
SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy, SkColor color,
uint32_t flags = kNone_BlurFlag);
virtual ~SkBlurDrawLooper();
// overrides from SkDrawLooper
virtual void init(SkCanvas*, SkPaint*);
virtual bool next();
virtual void restore();
static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
return SkNEW_ARGS(SkBlurDrawLooper, (buffer));
}
protected:
SkBlurDrawLooper(SkFlattenableReadBuffer&);
// overrides from SkFlattenable
virtual void flatten(SkFlattenableWriteBuffer& );
virtual Factory getFactory() { return CreateProc; }
private:
SkCanvas* fCanvas;
SkPaint* fPaint;
SkMaskFilter* fBlur;
SkScalar fDx, fDy;
SkColor fBlurColor;
SkColor fSavedColor; // remember the original
int fSaveCount;
uint32_t fBlurFlags;
enum State {
kBeforeEdge,
kAfterEdge,
kDone
};
State fState;
typedef SkDrawLooper INHERITED;
};
#endif
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