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 SkDropShadowImageFilter_DEFINED
9 #define SkDropShadowImageFilter_DEFINED
10 
11 #include "SkColor.h"
12 #include "SkFlattenable.h"
13 #include "SkImageFilter.h"
14 #include "SkScalar.h"
15 
16 class SK_API SkDropShadowImageFilter : public SkImageFilter {
17 public:
18     enum ShadowMode {
19         kDrawShadowAndForeground_ShadowMode,
20         kDrawShadowOnly_ShadowMode,
21 
22         kLast_ShadowMode = kDrawShadowOnly_ShadowMode
23     };
24 
25     static const int kShadowModeCount = kLast_ShadowMode+1;
26 
27     static sk_sp<SkImageFilter> Make(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY,
28                                      SkColor color, ShadowMode shadowMode,
29                                      sk_sp<SkImageFilter> input,
30                                      const CropRect* cropRect = nullptr);
31 
32     SkRect computeFastBounds(const SkRect&) const override;
33 
34 protected:
35     void flatten(SkWriteBuffer&) const override;
36     sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context&,
37                                         SkIPoint* offset) const override;
38     sk_sp<SkImageFilter> onMakeColorSpace(SkColorSpaceXformer*) const override;
39     SkIRect onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm,
40                                MapDirection, const SkIRect* inputRect) const override;
41 
42 private:
43     SK_FLATTENABLE_HOOKS(SkDropShadowImageFilter)
44 
45     SkDropShadowImageFilter(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY, SkColor,
46                             ShadowMode shadowMode, sk_sp<SkImageFilter> input,
47                             const CropRect* cropRect);
48 
49     SkScalar fDx, fDy, fSigmaX, fSigmaY;
50     SkColor fColor;
51     ShadowMode fShadowMode;
52 
53     typedef SkImageFilter INHERITED;
54 };
55 
56 #endif
57