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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
};
static SkBlurDrawLooper* Create(SkColor color, SkScalar sigma, SkScalar dx, SkScalar dy,
uint32_t flags = kNone_BlurFlag) {
return SkNEW_ARGS(SkBlurDrawLooper, (color, sigma, dx, dy, flags));
}
virtual ~SkBlurDrawLooper();
SkDrawLooper::Context* createContext(SkCanvas*, void* storage) const SK_OVERRIDE;
size_t contextSize() const SK_OVERRIDE { return sizeof(BlurDrawLooperContext); }
SK_TO_STRING_OVERRIDE()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkBlurDrawLooper)
protected:
SkBlurDrawLooper(SkColor color, SkScalar sigma, SkScalar dx, SkScalar dy,
uint32_t flags);
void flatten(SkWriteBuffer&) const SK_OVERRIDE;
bool asABlurShadow(BlurShadowRec*) const SK_OVERRIDE;
private:
SkMaskFilter* fBlur;
SkColorFilter* fColorFilter;
SkScalar fDx, fDy, fSigma;
SkColor fBlurColor;
uint32_t fBlurFlags;
enum State {
kBeforeEdge,
kAfterEdge,
kDone
};
class BlurDrawLooperContext : public SkDrawLooper::Context {
public:
explicit BlurDrawLooperContext(const SkBlurDrawLooper* looper);
bool next(SkCanvas* canvas, SkPaint* paint) SK_OVERRIDE;
private:
const SkBlurDrawLooper* fLooper;
State fState;
};
void init(SkScalar sigma, SkScalar dx, SkScalar dy, SkColor color, uint32_t flags);
void initEffects();
typedef SkDrawLooper INHERITED;
};
#endif
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