Insert clip fragment processor outside GrCMM

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 "GrStencil.h"
 #include "GrTexture.h"
 #include "SkClipStack.h"
 #include "SkDeque.h"
 #include "SkPath.h"
 #include "SkRefCnt.h"
 #include "SkTLList.h"
 #include "SkTypes.h"
 
 class GrDrawTarget;
 class GrPathRenderer;
 class GrPathRendererChain;
 class GrTexture;
 class SkPath;
+
+/**
+ * Produced by GrClipMaskManager. It provides a set of modifications to the drawing state that
+ * are used to create the final GrPipeline for a GrBatch. This is a work in progress. It will
+ * eventually encapsulate all mechanisms for modifying the scissor, shaders, and stencil state
+ * to implement clipping.
+ */
+class GrAppliedClip : public SkNoncopyable {
+public:
+    GrAppliedClip() {}
+    const GrFragmentProcessor* clipCoverageFragmentProcessor() const { return fClipCoverageFP; }
+
+private:
+    SkAutoTUnref<const GrFragmentProcessor> fClipCoverageFP;
+    friend class GrClipMaskManager;
+
+    typedef SkNoncopyable INHERITED;
+};
+
 /**
  * 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 {
 public:
     GrClipMaskManager(GrDrawTarget* 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. The AutoRestoreEffects is initialized by
      * the manager when it must install additional effects to implement the
      * clip. devBounds is optional but can help optimize clipping.
      */
     bool setupClipping(const GrPipelineBuilder&,
-                       GrPipelineBuilder::AutoRestoreFragmentProcessorState*,
                        GrPipelineBuilder::AutoRestoreStencil*,
                        GrScissorState*,
-                       const SkRect* devBounds);
+                       const SkRect* devBounds,
+                       GrAppliedClip*);
 
     bool isClipInStencil() const {
         return kStencil_ClipMaskType == fCurrClipMaskType;
     }
 
     bool isClipInAlpha() const {
         return kAlpha_ClipMaskType == fCurrClipMaskType;
     }
 
     void adjustPathStencilParams(const GrStencilAttachment*, GrStencilSettings*);
@@ skipping 10 matching lines @@
         kModifyClip_StencilClipMode,
         // Clip against the existing representation of the clip in the high bit
         // of the stencil buffer.
         kRespectClip_StencilClipMode,
         // Neither writing to nor clipping against the clip bit.
         kIgnoreClip_StencilClipMode,
     };
 
     // Attempts to install a series of coverage effects to implement the clip. Return indicates
     // whether the element list was successfully converted to effects.
-    bool installClipEffects(const GrPipelineBuilder&,
-                            GrPipelineBuilder::AutoRestoreFragmentProcessorState*,
-                            const GrReducedClip::ElementList&,
-                            const SkVector& clipOffset,
-                            const SkRect* devBounds);
+    const GrFragmentProcessor* getAnalyticClipProcessor(const GrReducedClip::ElementList&,
+                                                        const SkVector& clipOffset,
+                                                        const SkRect* devBounds);
 
     // 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);
 
     // Creates an alpha mask of the clip. The mask is a rasterization of elements through the
@@ skipping 62 matching lines @@
      * We may represent the clip as a mask in the stencil buffer or as an alpha
      * texture. It may be neither because the scissor rect suffices or we
      * haven't yet examined the clip.
      */
     enum ClipMaskType {
         kNone_ClipMaskType,
         kStencil_ClipMaskType,
         kAlpha_ClipMaskType,
     } fCurrClipMaskType;
 
+    static const int kMaxAnalyticElements = 4;
+
     GrDrawTarget*   fDrawTarget;    // This is our owning draw target.
     StencilClipMode fClipMode;
 
     typedef SkNoncopyable INHERITED;
 };
 #endif // GrClipMaskManager_DEFINED