Rename GrAtlasMgr to GrAtlas (and other cleanup)

src/gpu/GrAtlas.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 GrAtlas_DEFINED
 #define GrAtlas_DEFINED
 
 
 #include "SkPoint.h"
 #include "GrTexture.h"
 #include "GrDrawTarget.h"
 
 class GrGpu;
 class GrRectanizer;
-class GrAtlasMgr;
 class GrAtlas;
 
 // The backing GrTexture for a set of GrAtlases is broken into a spatial grid of GrPlots. When
 // a GrAtlas needs space on the texture, it requests a GrPlot. Each GrAtlas can claim one
 // or more GrPlots. The GrPlots keep track of subimage placement via their GrRectanizer. Once a
 // GrPlot is "full" (i.e. there is no room for the new subimage according to the GrRectanizer), the
-// GrAtlas can request a new GrPlot via GrAtlasMgr::addToAtlas().
+// GrAtlas can request a new GrPlot via GrAtlas::addToAtlas().
 //
 // If all GrPlots are allocated, the replacement strategy is up to the client. The drawToken is
 // available to ensure that all draw calls are finished for that particular GrPlot.
-// GrAtlasMgr::removeUnusedPlots() will free up any finished plots for a given GrAtlas.
+// GrAtlas::removeUnusedPlots() will free up any finished plots for a given GrAtlas.
 
 class GrPlot {
 public:
     SK_DECLARE_INTERNAL_LLIST_INTERFACE(GrPlot);
 
     GrTexture* texture() const { return fTexture; }
 
     bool addSubImage(int width, int height, const void*, SkIPoint16*);
 
     GrDrawTarget::DrawToken drawToken() const { return fDrawToken; }
     void setDrawToken(GrDrawTarget::DrawToken draw) { fDrawToken = draw; }
 
     void uploadToTexture();
 
     void resetRects();
 
 private:
     GrPlot();
     ~GrPlot(); // does not try to delete the fNext field
-    void init(GrAtlasMgr* mgr, int offX, int offY, int width, int height, size_t bpp,
+    void init(GrAtlas* atlas, int offX, int offY, int width, int height, size_t bpp,
               bool batchUploads);
 
     // for recycling
     GrDrawTarget::DrawToken fDrawToken;
 
     unsigned char*          fPlotData;
     GrTexture*              fTexture;
     GrRectanizer*           fRects;
-    GrAtlasMgr*             fAtlasMgr;
+    GrAtlas*                fAtlas;
     SkIPoint16              fOffset;        // the offset of the plot in the backing texture
     size_t                  fBytesPerPixel;
     SkIRect                 fDirtyRect;
     bool                    fDirty;
     bool                    fBatchUploads;
 
-    friend class GrAtlasMgr;
+    friend class GrAtlas;
 };
 
 typedef SkTInternalLList<GrPlot> GrPlotList;
 
-class GrAtlasMgr {
+class GrAtlas {
 public:
-    GrAtlasMgr(GrGpu*, GrPixelConfig, const SkISize& backingTextureSize,
-               int numPlotsX, int numPlotsY, bool batchUploads);
-    ~GrAtlasMgr();
+    // This class allows each client to independently track the GrPlots in
+    // which its data is stored.
+    class ClientPlotUsage {
+    public:
+        bool isEmpty() const { return 0 == fPlots.count(); }
+
+    private:
+        SkTDArray<GrPlot*> fPlots;
+
+        friend class GrAtlas;
+    };
+
+    GrAtlas(GrGpu*, GrPixelConfig, const SkISize& backingTextureSize,
+            int numPlotsX, int numPlotsY, bool batchUploads);
+    ~GrAtlas();
 
     // add subimage of width, height dimensions to atlas
     // returns the containing GrPlot and location relative to the backing texture
-    GrPlot* addToAtlas(GrAtlas*, int width, int height, const void*, SkIPoint16*);
+    GrPlot* addToAtlas(ClientPlotUsage*, int width, int height, const void*, SkIPoint16*);
 
     // remove reference to this plot
-    bool removePlot(GrAtlas* atlas, const GrPlot* plot);
+    void removePlot(ClientPlotUsage* usage, const GrPlot* plot);
 
     // get a plot that's not being used by the current draw
     // this allows us to overwrite this plot without flushing
     GrPlot* getUnusedPlot();
 
     GrTexture* getTexture() const {
         return fTexture;
     }
 
     void uploadPlotsToTexture();
 
 private:
-    void moveToHead(GrPlot* plot);
+    void makeMRU(GrPlot* plot);
 
     GrGpu*        fGpu;
     GrPixelConfig fPixelConfig;
     GrTexture*    fTexture;
     SkISize       fBackingTextureSize;
     int           fNumPlotsX;
     int           fNumPlotsY;
     bool          fBatchUploads;
 
     // allocated array of GrPlots
     GrPlot*       fPlotArray;
-    // LRU list of GrPlots
+    // LRU list of GrPlots (MRU at head - LRU at tail)
     GrPlotList    fPlotList;
 };
 
-class GrAtlas {
-public:
-    GrAtlas() { }
-    ~GrAtlas() { }
-
-    bool isEmpty() { return 0 == fPlots.count(); }
-
-private:
-    SkTDArray<GrPlot*> fPlots;
-
-    friend class GrAtlasMgr;
-};
-
 #endif