1 /*
2  * Copyright 2015 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 SkLocalMatrixImageFilter_DEFINED
9 #define SkLocalMatrixImageFilter_DEFINED
10 
11 #include "SkImageFilter.h"
12 
13 /**
14  *  Wraps another imagefilter + matrix, such that using this filter will give the same result
15  *  as using the wrapped filter with the matrix applied to its context.
16  */
17 class SkLocalMatrixImageFilter : public SkImageFilter {
18 public:
19     static sk_sp<SkImageFilter> Make(const SkMatrix& localM, sk_sp<SkImageFilter> input);
20 
21     SK_TO_STRING_OVERRIDE()
22     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLocalMatrixImageFilter)
23 
24 protected:
25     void flatten(SkWriteBuffer&) const override;
26     sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context&,
27                                         SkIPoint* offset) const override;
28     SkIRect onFilterBounds(const SkIRect& src, const SkMatrix&, MapDirection) const override;
29 
30 private:
31     SkLocalMatrixImageFilter(const SkMatrix& localM, sk_sp<SkImageFilter> input);
32 
33     SkMatrix fLocalM;
34 
35     typedef SkImageFilter INHERITED;
36 };
37 
38 #endif
39