text: /*
   * Copyright 2017 Google Inc.
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  
  #ifndef GrOnFlushResourceProvider_DEFINED
  #define GrOnFlushResourceProvider_DEFINED
  
  #include "include/core/SkRefCnt.h"
  #include "include/private/SkTArray.h"
  #include "src/gpu/GrDeferredUpload.h"
  #include "src/gpu/GrOpFlushState.h"
  #include "src/gpu/GrResourceProvider.h"
  
  class GrDrawingManager;
  class GrOpList;
  class GrOnFlushResourceProvider;
  class GrRenderTargetOpList;
  class GrRenderTargetContext;
  class GrSurfaceProxy;
  class SkColorSpace;
  class SkSurfaceProps;
  
  /*
   * This is the base class from which all pre-flush callback objects must be derived. It
   * provides the "preFlush" / "postFlush" interface.
   */
  class GrOnFlushCallbackObject {
  public:
      virtual ~GrOnFlushCallbackObject() {}
  
      /*
       * The onFlush callback allows subsystems (e.g., text, path renderers) to create atlases
       * for a specific flush. All the GrOpList IDs required for the flush are passed into the
       * callback. The callback should return the render target contexts used to render the atlases
       * in 'results'.
       */
      virtual void preFlush(GrOnFlushResourceProvider*,
                            const uint32_t* opListIDs, int numOpListIDs,
                            SkTArray<sk_sp<GrRenderTargetContext>>* results) = 0;
  
      /**
       * Called once flushing is complete and all ops indicated by preFlush have been executed and
       * released. startTokenForNextFlush can be used to track resources used in the current flush.
       */
      virtual void postFlush(GrDeferredUploadToken startTokenForNextFlush,
                             const uint32_t* opListIDs, int numOpListIDs) {}
  
      /**
       * Tells the callback owner to hold onto this object when freeing GPU resources
       *
       * In particular, GrDrawingManager::freeGPUResources() deletes all the path renderers.
       * Any OnFlushCallbackObject associated with a path renderer will need to be deleted.
       */
      virtual bool retainOnFreeGpuResources() { return false; }
  };
  
  /*
   * This class is a shallow wrapper around the drawing manager. It is passed into the
   * onFlush callbacks and is intended to limit the functionality available to them.
   * It should never have additional data members or virtual methods.
   */
  class GrOnFlushResourceProvider {
  public:
      explicit GrOnFlushResourceProvider(GrDrawingManager* drawingMgr) : fDrawingMgr(drawingMgr) {}
  
      sk_sp<GrRenderTargetContext> makeRenderTargetContext(sk_sp<GrSurfaceProxy>,
                                                           sk_sp<SkColorSpace>,
                                                           const SkSurfaceProps*);
  
      // Proxy unique key management. See GrProxyProvider.h.
      bool assignUniqueKeyToProxy(const GrUniqueKey&, GrTextureProxy*);
      void removeUniqueKeyFromProxy(GrTextureProxy*);
      void processInvalidUniqueKey(const GrUniqueKey&);
      sk_sp<GrTextureProxy> findOrCreateProxyByUniqueKey(const GrUniqueKey&, GrSurfaceOrigin);
  
      bool instatiateProxy(GrSurfaceProxy*);
  
      // Creates a GPU buffer with a "dynamic" access pattern.
      sk_sp<GrGpuBuffer> makeBuffer(GrGpuBufferType, size_t, const void* data = nullptr);
  
      // Either finds and refs, or creates a static GPU buffer with the given data.
      sk_sp<const GrGpuBuffer> findOrMakeStaticBuffer(GrGpuBufferType, size_t, const void* data,
                                                      const GrUniqueKey&);
  
      uint32_t contextID() const;
      const GrCaps* caps() const;
  
  private:
      GrOnFlushResourceProvider(const GrOnFlushResourceProvider&) = delete;
      GrOnFlushResourceProvider& operator=(const GrOnFlushResourceProvider&) = delete;
  
      GrDrawingManager* fDrawingMgr;
  };
  
  #endif
  