Remove GrLayerHoister

src/gpu/GrLayerAtlas.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 GrLayerAtlas_DEFINED
-#define GrLayerAtlas_DEFINED
-
-#include "GrTexture.h"
-
-#include "SkPoint.h"
-#include "SkTDArray.h"
-#include "SkTInternalLList.h"
-
-class GrLayerAtlas;
-class GrTextureProvider;
-class GrRectanizer;
-
-// The backing GrTexture for a GrLayerAtlas is broken into a spatial grid of Plots. When
-// the atlas needs space on the texture (i.e., in response to an addToAtlas call), it
-// iterates through the plots in use by the requesting client looking for space and,
-// if no space is found, opens up a new Plot for that client. The Plots keep track of
-// subimage placement via their GrRectanizer.
-//
-// If all Plots are full, the replacement strategy is up to the client. The Plot::reset
-// call will remove a Plot's knowledge of any allocated rects - freeing its space for reuse.
-
-class GrLayerAtlas {
-public:
-    class Plot {
-        SK_DECLARE_INTERNAL_LLIST_INTERFACE(Plot); // In an MRU llist
-
-    public:
-        // This returns a plot ID unique to each plot in the atlas. They are
-        // consecutive and start at 0.
-        int id() const { return fID; }
-
-        void reset();
-
-    private:
-        friend class GrLayerAtlas;
-
-        Plot();
-        ~Plot(); // does not try to delete the fNext field
-
-        void init(int id, int offX, int offY, int width, int height);
-
-        bool allocateRect(int width, int height, SkIPoint16*);
-
-        int                     fID;
-        GrRectanizer*           fRects;
-        SkIPoint16              fOffset;        // the offset of the plot in the backing texture
-    };
-
-    // This class allows each client to independently track the Plots in
-    // which its data is stored.
-    // For example, multiple pictures may simultaneously store their layers in the
-    // layer atlas. When a picture goes away it can use the ClientPlotUsage to remove itself
-    // from those plots.
-    class ClientPlotUsage {
-    public:
-        ClientPlotUsage(int maxPlots)
-            SkDEBUGCODE(: fMaxPlots(maxPlots)) {
-            fPlots.setReserve(maxPlots);
-        }
-
-        bool isEmpty() const { return 0 == fPlots.count(); }
-
-        int numPlots() const { return fPlots.count(); }
-        Plot* plot(int index) { return fPlots[index]; }
-
-        void appendPlot(Plot* plot) {
-            SkASSERT(fPlots.count() <= fMaxPlots);
-            SkASSERT(!fPlots.contains(plot));
-            *fPlots.append() = plot;
-        }
-
-        // remove reference to 'plot'
-        void removePlot(const Plot* plot) {
-            int index = fPlots.find(const_cast<Plot*>(plot));
-            if (index >= 0) {
-                fPlots.remove(index);
-            }
-        }
-
-#ifdef SK_DEBUG
-        bool contains(const Plot* plot) const {
-            return fPlots.contains(const_cast<Plot*>(plot));
-        }
-#endif
-
-    private:
-        SkTDArray<Plot*> fPlots;
-        SkDEBUGCODE(int fMaxPlots;)
-    };
-
-    GrLayerAtlas(GrTextureProvider*, GrPixelConfig, GrSurfaceFlags flags,
-                 const SkISize& backingTextureSize,
-                 int numPlotsX, int numPlotsY);
-    ~GrLayerAtlas();
-
-    // Requests a width x height block in the atlas. Upon success it returns
-    // the containing Plot and absolute location in the backing texture.
-    // nullptr is returned if there is no more space in the atlas.
-    Plot* addToAtlas(ClientPlotUsage*, int width, int height, SkIPoint16* loc);
-
-    GrTexture* getTextureOrNull() const {
-        return fTexture;
-    }
-
-    GrTexture* getTexture() const {
-        SkASSERT(fTexture);
-        return fTexture;
-    }
-
-    bool reattachBackingTexture();
-
-    void detachBackingTexture() {
-        fTexture.reset(nullptr);
-    }
-
-    void resetPlots();
-
-    enum IterOrder {
-        kLRUFirst_IterOrder,
-        kMRUFirst_IterOrder
-    };
-
-    typedef SkTInternalLList<Plot> PlotList;
-    typedef PlotList::Iter PlotIter;
-    Plot* iterInit(PlotIter* iter, IterOrder order) {
-        return iter->init(fPlotList, kLRUFirst_IterOrder == order
-                                                       ? PlotList::Iter::kTail_IterStart
-                                                       : PlotList::Iter::kHead_IterStart);
-    }
-
-private:
-    void createBackingTexture();
-
-    void makeMRU(Plot* plot);
-
-    GrTextureProvider* fTexProvider;
-    GrPixelConfig      fPixelConfig;
-    GrSurfaceFlags     fFlags;
-    SkAutoTUnref<GrTexture> fTexture;
-
-    SkISize            fBackingTextureSize;
-
-    // allocated array of Plots
-    Plot*              fPlotArray;
-    // LRU list of Plots (MRU at head - LRU at tail)
-    PlotList           fPlotList;
-};
-
-#endif