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/*
* 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 "GrPoint.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().
//
// 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.
class GrPlot {
public:
SK_DECLARE_INTERNAL_LLIST_INTERFACE(GrPlot);
GrTexture* texture() const { return fTexture; }
bool addSubImage(int width, int height, const void*, GrIPoint16*);
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,
bool batchUploads);
// for recycling
GrDrawTarget::DrawToken fDrawToken;
unsigned char* fPlotData;
GrTexture* fTexture;
GrRectanizer* fRects;
GrAtlasMgr* fAtlasMgr;
GrIPoint16 fOffset; // the offset of the plot in the backing texture
size_t fBytesPerPixel;
SkIRect fDirtyRect;
bool fDirty;
bool fBatchUploads;
friend class GrAtlasMgr;
};
typedef SkTInternalLList<GrPlot> GrPlotList;
class GrAtlasMgr {
public:
GrAtlasMgr(GrGpu*, GrPixelConfig, const SkISize& backingTextureSize,
int numPlotsX, int numPlotsY, bool batchUploads);
~GrAtlasMgr();
// 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*, GrIPoint16*);
// remove reference to this plot
bool removePlot(GrAtlas* atlas, 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);
GrGpu* fGpu;
GrPixelConfig fPixelConfig;
GrTexture* fTexture;
SkISize fBackingTextureSize;
int fNumPlotsX;
int fNumPlotsY;
bool fBatchUploads;
// allocated array of GrPlots
GrPlot* fPlotArray;
// LRU list of GrPlots
GrPlotList fPlotList;
};
class GrAtlas {
public:
GrAtlas() { }
~GrAtlas() { }
bool isEmpty() { return 0 == fPlots.count(); }
private:
SkTDArray<GrPlot*> fPlots;
friend class GrAtlasMgr;
};
#endif
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