1 /*
2  * Copyright 2014 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 SkMatrixImageFilter_DEFINED
9 #define SkMatrixImageFilter_DEFINED
10 
11 #include "SkImageFilter.h"
12 #include "SkMatrix.h"
13 
14 /*! \class SkMatrixImageFilter
15     Matrix transformation image filter.  This filter draws its source
16     input transformed by the given matrix.
17  */
18 
19 class SK_API SkMatrixImageFilter : public SkImageFilter {
20 public:
21     /** Construct a 2D transformation image filter.
22      *  @param transform     The matrix to apply when drawing the src bitmap
23      *  @param filterQuality The quality of filtering to apply when scaling.
24      *  @param input         The input image filter.  If nullptr, the src bitmap
25      *                       passed to filterImage() is used instead.
26      */
27 
28     static sk_sp<SkImageFilter> Make(const SkMatrix& transform,
29                                      SkFilterQuality filterQuality,
30                                      sk_sp<SkImageFilter> input);
31 
32     SkRect computeFastBounds(const SkRect&) const override;
33 
34     SK_TO_STRING_OVERRIDE()
35     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkMatrixImageFilter)
36 
37 protected:
38     SkMatrixImageFilter(const SkMatrix& transform,
39                         SkFilterQuality,
40                         sk_sp<SkImageFilter> input);
41     void flatten(SkWriteBuffer&) const override;
42 
43     sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context&,
44                                         SkIPoint* offset) const override;
45     SkIRect onFilterNodeBounds(const SkIRect& src, const SkMatrix&, MapDirection) const override;
46 
47 private:
48     SkMatrix              fTransform;
49     SkFilterQuality       fFilterQuality;
50     typedef SkImageFilter INHERITED;
51 };
52 
53 #endif
54