Make GrClipMaskManager stateless and push GrPipelineBuilder construction downstack

src/gpu/GrClipMaskManager.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef GrClipMaskManager_DEFINED
 #define GrClipMaskManager_DEFINED
 
 #include "GrPipelineBuilder.h"
 #include "GrReducedClip.h"
 #include "SkClipStack.h"
 #include "SkTypes.h"
 
 class GrAppliedClip;
 class GrClipStackClip;
-class GrDrawTarget;
+class GrDrawContext;
+class GrFixedClip;
 class GrPathRenderer;
 class GrPathRendererChain;
 class GrResourceProvider;
 class GrTexture;
 class GrTextureProvider;
 
 /**
  * The clip mask creator handles the generation of the clip mask. If anti
  * aliasing is requested it will (in the future) generate a single channel
  * (8bit) mask. If no anti aliasing is requested it will generate a 1-bit
  * mask in the stencil buffer. In the non anti-aliasing case, if the clip
  * mask can be represented as a rectangle then scissoring is used. In all
  * cases scissoring is used to bound the range of the clip mask.
  */
-class GrClipMaskManager : SkNoncopyable {
+// This has to remain a class, for now, so it can be friended (by GrDrawContext & GrContext)
+class GrClipMaskManager {
 public:
-    GrClipMaskManager(GrDrawTarget* owner) : fDrawTarget(owner) {}
-
     /**
      * Creates a clip mask if necessary as a stencil buffer or alpha texture
      * and sets the GrGpu's scissor and stencil state. If the return is false
      * then the draw can be skipped. devBounds is optional but can help optimize
      * clipping.
      */
-    bool setupClipping(const GrPipelineBuilder&, const GrClipStackClip&, const SkRect* devBounds,
-                       GrAppliedClip*);
+    static bool SetupClipping(GrContext*, const GrPipelineBuilder&, GrDrawContext*,
+                              const GrClipStackClip&, const SkRect* devBounds, GrAppliedClip*);
 
 private:
-    inline GrContext* getContext();
-    inline const GrCaps* caps() const;
-    inline GrResourceProvider* resourceProvider();
+    static void DrawNonAARect(GrDrawContext* drawContext,
+                              const GrFixedClip& clip,
+                              const SkMatrix& viewMatrix,
+                              const SkRect& rect,
+                              bool isAA,
+                              const GrUserStencilSettings* stencilSettings);
 
     static bool PathNeedsSWRenderer(GrContext* context,
                                     bool hasUserStencilSettings,
-                                    const GrRenderTarget* rt,
+                                    const GrDrawContext*,
                                     const SkMatrix& viewMatrix,
                                     const SkClipStack::Element* element,
                                     GrPathRenderer** prOut,
                                     bool needsStencil);
-    static GrPathRenderer* GetPathRenderer(GrContext* context,
-                                           GrTexture* texture,
-                                           const SkMatrix& viewMatrix,
-                                           const SkClipStack::Element* element);
-
-    // Attempts to install a series of coverage effects to implement the clip. Return indicates
-    // whether the element list was successfully converted to processors. *fp may be nullptr even
-    // when the function succeeds because all the elements were ignored. TODO: Make clip reduction
-    // bounds-aware and stop checking bounds in this function. Similarly, we shouldn't need to pass
-    // abortIfAA, but we don't yet know if all the AA elements will be eliminated.
-    bool getAnalyticClipProcessor(const GrReducedClip::ElementList&,
-                                  bool abortIfAA,
-                                  SkVector& clipOffset,
-                                  const SkRect* devBounds,
-                                  sk_sp<const GrFragmentProcessor>* fp);
 
     // Draws the clip into the stencil buffer
-    bool createStencilClipMask(GrRenderTarget*,
-                               int32_t elementsGenID,
-                               GrReducedClip::InitialState initialState,
-                               const GrReducedClip::ElementList& elements,
-                               const SkIRect& clipSpaceIBounds,
-                               const SkIPoint& clipSpaceToStencilOffset);
+    static bool CreateStencilClipMask(GrContext*,
+                                      GrDrawContext*,
+                                      int32_t elementsGenID,
+                                      GrReducedClip::InitialState initialState,
+                                      const GrReducedClip::ElementList& elements,
+                                      const SkIRect& clipSpaceIBounds,
+                                      const SkIPoint& clipSpaceToStencilOffset);
 
     // Creates an alpha mask of the clip. The mask is a rasterization of elements through the
     // rect specified by clipSpaceIBounds.
     static sk_sp<GrTexture> CreateAlphaClipMask(GrContext*,
                                                 int32_t elementsGenID,
                                                 GrReducedClip::InitialState initialState,
                                                 const GrReducedClip::ElementList& elements,
                                                 const SkVector& clipToMaskOffset,
                                                 const SkIRect& clipSpaceIBounds);
 
     // Similar to createAlphaClipMask but it rasterizes in SW and uploads to the result texture.
     static sk_sp<GrTexture> CreateSoftwareClipMask(GrTextureProvider*,
                                                    int32_t elementsGenID,
                                                    GrReducedClip::InitialState initialState,
                                                    const GrReducedClip::ElementList& elements,
                                                    const SkVector& clipToMaskOffset,
                                                    const SkIRect& clipSpaceIBounds);
 
    static bool UseSWOnlyPath(GrContext*,
                              const GrPipelineBuilder&,
-                             const GrRenderTarget* rt,
+                             const GrDrawContext*,
                              const SkVector& clipToMaskOffset,
                              const GrReducedClip::ElementList& elements);
 
-    GrTexture* createCachedMask(int width, int height, const GrUniqueKey& key, bool renderTarget);
+    static GrTexture* CreateCachedMask(int width, int height, const GrUniqueKey& key,
+                                       bool renderTarget);
+};
 
-    static const int kMaxAnalyticElements = 4;
-
-    GrDrawTarget*   fDrawTarget;    // This is our owning draw target.
-
-    typedef SkNoncopyable INHERITED;
-};
 #endif // GrClipMaskManager_DEFINED