1 /*
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4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions are
6  * met:
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9  * notice, this list of conditions and the following disclaimer.
10  *     * Redistributions in binary form must reproduce the above
11  * copyright notice, this list of conditions and the following disclaimer
12  * in the documentation and/or other materials provided with the
13  * distribution.
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16  * this software without specific prior written permission.
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18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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29  */
30 
31 #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_DRAW_LOOPER_BUILDER_H_
32 #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_DRAW_LOOPER_BUILDER_H_
33 
34 #include <memory>
35 
36 #include "base/macros.h"
37 #include "third_party/blink/renderer/platform/platform_export.h"
38 #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
39 #include "third_party/skia/include/core/SkRefCnt.h"
40 #include "third_party/skia/include/effects/SkLayerDrawLooper.h"
41 
42 class SkDrawLooper;
43 
44 namespace blink {
45 
46 class Color;
47 class FloatSize;
48 
49 class PLATFORM_EXPORT DrawLooperBuilder final {
50   STACK_ALLOCATED();
51 
52  public:
53   enum ShadowTransformMode {
54     kShadowRespectsTransforms,
55     kShadowIgnoresTransforms
56   };
57   enum ShadowAlphaMode { kShadowRespectsAlpha, kShadowIgnoresAlpha };
58 
59   DrawLooperBuilder();
60   ~DrawLooperBuilder();
61 
62   // Creates the SkDrawLooper and passes ownership to the caller. The builder
63   // should not be used any more after calling this method.
64   sk_sp<SkDrawLooper> DetachDrawLooper();
65 
66   void AddUnmodifiedContent();
67   void AddShadow(const FloatSize& offset,
68                  float blur,
69                  const Color&,
70                  ShadowTransformMode = kShadowRespectsTransforms,
71                  ShadowAlphaMode = kShadowRespectsAlpha);
72 
73  private:
74   SkLayerDrawLooper::Builder sk_draw_looper_builder_;
75 
76   // Implementing the copy constructor properly would require writing code to
77   // copy the underlying SkLayerDrawLooper::Builder.
78   DISALLOW_COPY_AND_ASSIGN(DrawLooperBuilder);
79 };
80 
81 }  // namespace blink
82 
83 #endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_DRAW_LOOPER_BUILDER_H_
84