Skia
2DGraphicsLibrary
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Pages
SkDisplacementMapEffect.h
1 /*
2  * Copyright 2013 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #ifndef SkDisplacementMapEffect_DEFINED
9 #define SkDisplacementMapEffect_DEFINED
10 
11 #include "SkImageFilter.h"
12 
13 class SK_API SkDisplacementMapEffect : public SkImageFilter {
14 public:
15  enum ChannelSelectorType {
16  kUnknown_ChannelSelectorType,
17  kR_ChannelSelectorType,
18  kG_ChannelSelectorType,
19  kB_ChannelSelectorType,
20  kA_ChannelSelectorType
21  };
22 
23  ~SkDisplacementMapEffect() override;
24 
25  static sk_sp<SkImageFilter> Make(ChannelSelectorType xChannelSelector,
26  ChannelSelectorType yChannelSelector,
27  SkScalar scale,
28  sk_sp<SkImageFilter> displacement,
30  const CropRect* cropRect = nullptr);
31 
32  SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDisplacementMapEffect)
33 
34  SkRect computeFastBounds(const SkRect& src) const override;
35 
36  virtual SkIRect onFilterBounds(const SkIRect& src, const SkMatrix&,
37  MapDirection) const override;
38  sk_sp<SkImageFilter> onMakeColorSpace(SkColorSpaceXformer*) const override;
39  SkIRect onFilterNodeBounds(const SkIRect&, const SkMatrix&, MapDirection) const override;
40 
41  SK_TO_STRING_OVERRIDE()
42 
43 protected:
44  sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context&,
45  SkIPoint* offset) const override;
46 
47  SkDisplacementMapEffect(ChannelSelectorType xChannelSelector,
48  ChannelSelectorType yChannelSelector,
49  SkScalar scale, sk_sp<SkImageFilter> inputs[2],
50  const CropRect* cropRect);
51  void flatten(SkWriteBuffer&) const override;
52 
53 private:
54  ChannelSelectorType fXChannelSelector;
55  ChannelSelectorType fYChannelSelector;
56  SkScalar fScale;
57  typedef SkImageFilter INHERITED;
58  const SkImageFilter* getDisplacementInput() const { return getInput(0); }
59  const SkImageFilter* getColorInput() const { return getInput(1); }
60 };
61 
62 #endif
Definition: SkImageFilter.h:76
void flatten(SkWriteBuffer &) const override
Override this if your subclass needs to record data that it will need to recreate itself from its Cre...
The SkMatrix class holds a 3x3 matrix for transforming coordinates.
Definition: SkMatrix.h:28
virtual sk_sp< SkSpecialImage > onFilterImage(SkSpecialImage *src, const Context &, SkIPoint *offset) const =0
This is the virtual which should be overridden by the derived class to perform image filtering...
Definition: SkRefCnt.h:125
Base class for image filters.
Definition: SkImageFilter.h:36
SkImageFilter * getInput(int i) const
Returns the input filter at a given index, or NULL if no input is connected.
Definition: SkImageFilter.h:193
Definition: SkWriteBuffer.h:27
Definition: SkRect.h:404
virtual SkIRect onFilterNodeBounds(const SkIRect &, const SkMatrix &, MapDirection) const
Performs a forwards or reverse mapping of the given rect to accommodate this filter's margin requirem...
virtual SkIRect onFilterBounds(const SkIRect &, const SkMatrix &, MapDirection) const
This function recurses into its inputs with the given rect (first argument), calls filterBounds() wit...
Definition: SkImageFilter.h:54
SkIRect holds four 32 bit integer coordinates for a rectangle.
Definition: SkRect.h:20
SkIPoint holds two 32 bit integer coordinates.
Definition: SkPoint.h:40
Definition: SkDisplacementMapEffect.h:13