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/*
* Copyright 2008 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 SkBlurDrawLooper_DEFINED
#define SkBlurDrawLooper_DEFINED
#include "SkDrawLooper.h"
#include "SkColor.h"
class SkMaskFilter;
class SkColorFilter;
/** \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 SK_API 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,
kOverrideColor_BlurFlag = 0x02,
kHighQuality_BlurFlag = 0x04,
/** mask for all blur flags */
kAll_BlurFlag = 0x07
};
SkBlurDrawLooper(SkColor color, SkScalar sigma, SkScalar dx, SkScalar dy,
uint32_t flags = kNone_BlurFlag);
// DEPRECATED - radius-based
SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy, SkColor color,
uint32_t flags = kNone_BlurFlag);
virtual ~SkBlurDrawLooper();
// overrides from SkDrawLooper
virtual void init(SkCanvas*);
virtual bool next(SkCanvas*, SkPaint* paint);
SK_DEVELOPER_TO_STRING()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkBlurDrawLooper)
protected:
SkBlurDrawLooper(SkFlattenableReadBuffer&);
virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
private:
SkMaskFilter* fBlur;
SkColorFilter* fColorFilter;
SkScalar fDx, fDy;
SkColor fBlurColor;
uint32_t fBlurFlags;
enum State {
kBeforeEdge,
kAfterEdge,
kDone
};
State fState;
void init(SkScalar sigma, SkScalar dx, SkScalar dy, SkColor color, uint32_t flags);
typedef SkDrawLooper INHERITED;
};
#endif
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