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      1 /*
      2  * Copyright 2016 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 #ifndef GrClipStackClip_DEFINED
      8 #define GrClipStackClip_DEFINED
      9 
     10 #include "GrClip.h"
     11 #include "GrReducedClip.h"
     12 #include "SkClipStack.h"
     13 
     14 class GrPathRenderer;
     15 class GrTextureProxy;
     16 
     17 /**
     18  * GrClipStackClip can apply a generic SkClipStack to the draw state. It may need to generate an
     19  * 8-bit alpha clip mask and/or modify the stencil buffer during apply().
     20  */
     21 class GrClipStackClip final : public GrClip {
     22 public:
     23     GrClipStackClip(const SkClipStack* stack = nullptr) { this->reset(stack); }
     24 
     25     void reset(const SkClipStack* stack) { fStack = stack; }
     26 
     27     bool quickContains(const SkRect&) const final;
     28     bool quickContains(const SkRRect&) const final;
     29     void getConservativeBounds(int width, int height, SkIRect* devResult,
     30                                bool* isIntersectionOfRects) const final;
     31     bool apply(GrContext*, GrRenderTargetContext*, bool useHWAA, bool hasUserStencilSettings,
     32                GrAppliedClip* out, SkRect* bounds) const final;
     33 
     34     bool isRRect(const SkRect& rtBounds, SkRRect* rr, GrAA* aa) const override;
     35 
     36     sk_sp<GrTextureProxy> testingOnly_createClipMask(GrContext*) const;
     37     static const char kMaskTestTag[];
     38 
     39 private:
     40     static bool PathNeedsSWRenderer(GrContext* context,
     41                                     const SkIRect& scissorRect,
     42                                     bool hasUserStencilSettings,
     43                                     const GrRenderTargetContext*,
     44                                     const SkMatrix& viewMatrix,
     45                                     const SkClipStack::Element* element,
     46                                     GrPathRenderer** prOut,
     47                                     bool needsStencil);
     48 
     49     bool applyClipMask(GrContext*, GrRenderTargetContext*, const GrReducedClip&,
     50                        bool hasUserStencilSettings, GrAppliedClip*) const;
     51 
     52     // Creates an alpha mask of the clip. The mask is a rasterization of elements through the
     53     // rect specified by clipSpaceIBounds.
     54     sk_sp<GrTextureProxy> createAlphaClipMask(GrContext*, const GrReducedClip&) const;
     55 
     56     // Similar to createAlphaClipMask but it rasterizes in SW and uploads to the result texture.
     57     sk_sp<GrTextureProxy> createSoftwareClipMask(GrContext*, const GrReducedClip&,
     58                                                  GrRenderTargetContext*) const;
     59 
     60     static bool UseSWOnlyPath(GrContext*,
     61                               bool hasUserStencilSettings,
     62                               const GrRenderTargetContext*,
     63                               const GrReducedClip&);
     64 
     65     const SkClipStack*  fStack;
     66 };
     67 
     68 #endif // GrClipStackClip_DEFINED
     69