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SkPictureImageFilter.h
1 /*
2  * Copyright 2013 The Android Open Source Project
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 SkPictureImageFilter_DEFINED
9 #define SkPictureImageFilter_DEFINED
10 
11 #include "SkImageFilter.h"
12 #include "SkPicture.h"
13 
14 class SK_API SkPictureImageFilter : public SkImageFilter {
15 public:
19  static sk_sp<SkImageFilter> Make(sk_sp<SkPicture> picture);
20 
25  static sk_sp<SkImageFilter> Make(sk_sp<SkPicture> picture, const SkRect& cropRect);
26 
34  static sk_sp<SkImageFilter> MakeForLocalSpace(sk_sp<SkPicture> picture,
35  const SkRect& cropRect,
36  SkFilterQuality filterQuality);
37 
38  SK_TO_STRING_OVERRIDE()
39  SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPictureImageFilter)
40 
41 protected:
42  enum PictureResolution {
43  kDeviceSpace_PictureResolution,
44  kLocalSpace_PictureResolution
45  };
46 
47  /* Constructs an SkPictureImageFilter object from an SkReadBuffer.
48  * Note: If the SkPictureImageFilter object construction requires bitmap
49  * decoding, the decoder must be set on the SkReadBuffer parameter by calling
50  * SkReadBuffer::setBitmapDecoder() before calling this constructor.
51  * @param SkReadBuffer Serialized picture data.
52  */
53  void flatten(SkWriteBuffer&) const override;
54  sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context&,
55  SkIPoint* offset) const override;
56  sk_sp<SkImageFilter> onMakeColorSpace(SkColorSpaceXformer*) const override;
57 
58 private:
59  explicit SkPictureImageFilter(sk_sp<SkPicture> picture);
60  SkPictureImageFilter(sk_sp<SkPicture> picture, const SkRect& cropRect,
61  PictureResolution, SkFilterQuality, sk_sp<SkColorSpace>);
62 
63  void drawPictureAtDeviceResolution(SkCanvas* canvas,
64  const SkIRect& deviceBounds,
65  const Context&) const;
66  void drawPictureAtLocalResolution(SkSpecialImage* source,
67  SkCanvas*,
68  const SkIRect& deviceBounds,
69  const Context&) const;
70 
71  sk_sp<SkPicture> fPicture;
72  SkRect fCropRect;
73  PictureResolution fPictureResolution;
74  SkFilterQuality fFilterQuality;
75 
76  // Should never be set by a public constructor. This is only used when onMakeColorSpace()
77  // forces a deferred color space xform.
78  sk_sp<SkColorSpace> fColorSpace;
79 
80  typedef SkImageFilter INHERITED;
81 };
82 
83 #endif
A Canvas encapsulates all of the state about drawing into a device (bitmap).
Definition: SkCanvas.h:59
Definition: SkPictureImageFilter.h:14
void flatten(SkWriteBuffer &) const override
Override this if your subclass needs to record data that it will need to recreate itself from its Cre...
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
Definition: SkWriteBuffer.h:27
Definition: SkRect.h:404
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