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 #include "SkColor.h"
9 #include "SkImageFilter.h"
10 #include "SkScalar.h"
11 
12 class SK_API SkDropShadowImageFilter : public SkImageFilter {
13 public:
14     enum ShadowMode {
15         kDrawShadowAndForeground_ShadowMode,
16         kDrawShadowOnly_ShadowMode,
17 
18         kLast_ShadowMode = kDrawShadowOnly_ShadowMode
19     };
20 
21     static const int kShadowModeCount = kLast_ShadowMode+1;
22 
23     static SkImageFilter* Create(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY,
24                                  SkColor color, ShadowMode shadowMode, SkImageFilter* input = NULL,
25                                  const CropRect* cropRect = NULL) {
26         return new SkDropShadowImageFilter(dx, dy, sigmaX, sigmaY, color, shadowMode, input,
27                                            cropRect);
28     }
29 
30     void computeFastBounds(const SkRect&, SkRect*) const override;
31     SK_TO_STRING_OVERRIDE()
32     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDropShadowImageFilter)
33 
34 protected:
35     void flatten(SkWriteBuffer&) const override;
36     bool onFilterImageDeprecated(Proxy*, const SkBitmap& source, const Context&, SkBitmap* result,
37                                  SkIPoint* loc) const override;
38     void onFilterNodeBounds(const SkIRect& src, const SkMatrix&,
39                             SkIRect* dst, MapDirection) const override;
40 
41 private:
42     SkDropShadowImageFilter(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY, SkColor,
43                             ShadowMode shadowMode, SkImageFilter* input, const CropRect* cropRect);
44 
45     SkScalar fDx, fDy, fSigmaX, fSigmaY;
46     SkColor fColor;
47     ShadowMode fShadowMode;
48 
49     typedef SkImageFilter INHERITED;
50 };
51