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30 
31 #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_SHADOW_LIST_H_
32 #define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_SHADOW_LIST_H_
33 
34 #include <memory>
35 #include "third_party/blink/renderer/core/style/shadow_data.h"
36 #include "third_party/blink/renderer/platform/geometry/float_rect_outsets.h"
37 #include "third_party/blink/renderer/platform/graphics/draw_looper_builder.h"
38 #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
39 #include "third_party/blink/renderer/platform/wtf/ref_counted.h"
40 #include "third_party/blink/renderer/platform/wtf/vector.h"
41 
42 namespace blink {
43 
44 class FloatRect;
45 
46 typedef Vector<ShadowData, 1> ShadowDataVector;
47 
48 // These are used to store shadows in specified order, but we usually want to
49 // iterate over them backwards as the first-specified shadow is painted on top.
50 class ShadowList : public RefCounted<ShadowList> {
51   USING_FAST_MALLOC(ShadowList);
52 
53  public:
54   // This consumes passed in vector.
Adopt(ShadowDataVector & shadows)55   static scoped_refptr<ShadowList> Adopt(ShadowDataVector& shadows) {
56     return base::AdoptRef(new ShadowList(shadows));
57   }
Shadows()58   const ShadowDataVector& Shadows() const { return shadows_; }
59   bool operator==(const ShadowList& o) const { return shadows_ == o.shadows_; }
60   bool operator!=(const ShadowList& o) const { return !(*this == o); }
61 
62   // Outsets needed to include all shadows in this list, as well as the
63   // source (i.e. no outsets will be negative).
64   FloatRectOutsets RectOutsetsIncludingOriginal() const;
65 
66   void AdjustRectForShadow(FloatRect&) const;
67 
68   sk_sp<SkDrawLooper> CreateDrawLooper(DrawLooperBuilder::ShadowAlphaMode,
69                                        const Color& current_color,
70                                        mojom::blink::ColorScheme color_scheme,
71                                        bool is_horizontal = true) const;
72 
73  private:
ShadowList(ShadowDataVector & shadows)74   ShadowList(ShadowDataVector& shadows) {
75     // If we have no shadows, we use a null ShadowList
76     DCHECK(!shadows.IsEmpty());
77     shadows_.swap(shadows);
78     shadows_.ShrinkToFit();
79   }
80   ShadowDataVector shadows_;
81 };
82 
83 }  // namespace blink
84 
85 #endif  // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_SHADOW_LIST_H_
86