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include/gpu/GrContext.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrContext_DEFINED
 #define GrContext_DEFINED
 
 #include "GrCaps.h"
 #include "GrClip.h"
 #include "GrColor.h"
 #include "GrPaint.h"
 #include "GrRenderTarget.h"
 #include "GrTextureProvider.h"
 #include "SkMatrix.h"
 #include "SkPathEffect.h"
 #include "SkTypes.h"
 #include "../private/GrAuditTrail.h"
 #include "../private/GrSingleOwner.h"
 #include "../private/SkMutex.h"
 
 struct GrBatchAtlasConfig;
 class GrBatchFontCache;
 struct GrContextOptions;
+class GrContextThreadSafeProxy;
 class GrDrawingManager;
 class GrDrawContext;
 class GrDrawTarget;
 class GrFragmentProcessor;
 class GrGpu;
 class GrIndexBuffer;
 class GrLayerCache;
 class GrOvalRenderer;
 class GrPath;
 class GrPipelineBuilder;
@@ skipping 17 matching lines @@
     static GrContext* Create(GrBackend, GrBackendContext, const GrContextOptions& options);
     static GrContext* Create(GrBackend, GrBackendContext);
 
     /**
      * Only defined in test apps.
      */
     static GrContext* CreateMockContext();
 
     virtual ~GrContext();
 
+    GrContextThreadSafeProxy* threadSafeProxy();
+
     /**
      * The GrContext normally assumes that no outsider is setting state
      * within the underlying 3D API's context/device/whatever. This call informs
      * the context that the state was modified and it should resend. Shouldn't
      * be called frequently for good performance.
      * The flag bits, state, is dpendent on which backend is used by the
      * context, either GL or D3D (possible in future).
      */
     void resetContext(uint32_t state = kAll_GrBackendState);
 
@@ skipping 278 matching lines @@
 
     /** Get pointer to atlas texture for given mask format */
     GrTexture* getFontAtlasTexture(GrMaskFormat format);
 
     GrAuditTrail* getAuditTrail() { return &fAuditTrail; }
 
     /** This is only useful for debug purposes */
     SkDEBUGCODE(GrSingleOwner* debugSingleOwner() const { return &fSingleOwner; } )
 
 private:
-    GrGpu*                          fGpu;
-    const GrCaps*                   fCaps;
-    GrResourceCache*                fResourceCache;
+    GrGpu*                                  fGpu;
+    const GrCaps*                           fCaps;
+    GrResourceCache*                        fResourceCache;
     // this union exists because the inheritance of GrTextureProvider->GrResourceProvider
     // is in a private header.
     union {
-        GrResourceProvider*         fResourceProvider;
-        GrTextureProvider*          fTextureProvider;
+        GrResourceProvider*                 fResourceProvider;
+        GrTextureProvider*                  fTextureProvider;
     };
 
-    GrBatchFontCache*               fBatchFontCache;
-    SkAutoTDelete<GrLayerCache>     fLayerCache;
-    SkAutoTDelete<GrTextBlobCache>  fTextBlobCache;
+    SkAutoTUnref<GrContextThreadSafeProxy>  fThreadSafeProxy;
+
+    GrBatchFontCache*                       fBatchFontCache;
+    SkAutoTDelete<GrLayerCache>             fLayerCache;
+    SkAutoTDelete<GrTextBlobCache>          fTextBlobCache;
 
     // Set by OverbudgetCB() to request that GrContext flush before exiting a draw.
-    bool                            fFlushToReduceCacheSize;
-    bool                            fDidTestPMConversions;
-    int                             fPMToUPMConversion;
-    int                             fUPMToPMConversion;
+    bool                                    fFlushToReduceCacheSize;
+    bool                                    fDidTestPMConversions;
+    int                                     fPMToUPMConversion;
+    int                                     fUPMToPMConversion;
     // The sw backend may call GrContext::readSurfacePixels on multiple threads
     // We may transfer the responsibilty for using a mutex to the sw backend
     // when there are fewer code paths that lead to a readSurfacePixels call
     // from the sw backend. readSurfacePixels is reentrant in one case - when performing
     // the PM conversions test. To handle this we do the PM conversions test outside
     // of fReadPixelsMutex and use a separate mutex to guard it. When it re-enters
     // readSurfacePixels it will grab fReadPixelsMutex and release it before the outer
     // readSurfacePixels proceeds to grab it.
     // TODO: Stop pretending to make GrContext thread-safe for sw rasterization and provide
     // a mechanism to make a SkPicture safe for multithreaded sw rasterization.
-    SkMutex                         fReadPixelsMutex;
-    SkMutex                         fTestPMConversionsMutex;
+    SkMutex                                 fReadPixelsMutex;
+    SkMutex                                 fTestPMConversionsMutex;
 
     // In debug builds we guard against improper thread handling
     // This guard is passed to the GrDrawingManager and, from there to all the
     // GrDrawContexts.  It is also passed to the GrTextureProvider and SkGpuDevice.
-    mutable GrSingleOwner fSingleOwner;
+    mutable GrSingleOwner                   fSingleOwner;
 
     struct CleanUpData {
         PFCleanUpFunc fFunc;
         void*         fInfo;
     };
 
-    SkTDArray<CleanUpData>          fCleanUpData;
+    SkTDArray<CleanUpData>                  fCleanUpData;
 
-    const uint32_t                  fUniqueID;
+    const uint32_t                          fUniqueID;
 
-    SkAutoTDelete<GrDrawingManager> fDrawingManager;
+    SkAutoTDelete<GrDrawingManager>         fDrawingManager;
 
-    GrAuditTrail                    fAuditTrail;
+    GrAuditTrail                            fAuditTrail;
 
     // TODO: have the CMM use drawContexts and rm this friending
     friend class GrClipMaskManager; // the CMM is friended just so it can call 'drawingManager'
     friend class GrDrawingManager;  // for access to drawingManager for ProgramUnitTest
     GrDrawingManager* drawingManager() { return fDrawingManager; }
 
     GrContext(); // init must be called after the constructor.
     bool init(GrBackend, GrBackendContext, const GrContextOptions& options);
 
     void initMockContext();
@@ skipping 24 matching lines @@
 
     /**
      * A callback similar to the above for use by the TextBlobCache
      * TODO move textblob draw calls below context so we can use the call above.
      */
     static void TextBlobCacheOverBudgetCB(void* data);
 
     typedef SkRefCnt INHERITED;
 };
 
+class GrContextThreadSafeProxy : public SkRefCnt {
+private:
+    GrContextThreadSafeProxy(const GrCaps* caps, uint32_t uniqueID)
+        : fCaps(SkRef(caps))
+        , fContextUniqueID(uniqueID) {}
+
+    SkAutoTUnref<const GrCaps>  fCaps;
+    uint32_t                    fContextUniqueID;
+
+    friend class GrContext;
+    friend class SkImage;
+
+    typedef SkRefCnt INHERITED;
+};
+
 #endif