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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:
int getOffsetX() const { return fOffset.fX; }
int getOffsetY() const { return fOffset.fY; }
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; }
private:
GrPlot();
~GrPlot(); // does not try to delete the fNext field
// for recycling
GrDrawTarget::DrawToken fDrawToken;
GrPlot* fNext;
GrTexture* fTexture;
GrRectanizer* fRects;
GrAtlasMgr* fAtlasMgr;
GrIPoint16 fOffset;
size_t fBytesPerPixel;
friend class GrAtlasMgr;
};
class GrAtlasMgr {
public:
GrAtlasMgr(GrGpu*, GrPixelConfig);
~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*);
// free up any plots that are not waiting on a draw call
bool removeUnusedPlots(GrAtlas* atlas);
// to be called by ~GrAtlas()
void deletePlotList(GrPlot* plot);
GrTexture* getTexture() const {
return fTexture;
}
private:
GrPlot* allocPlot();
void freePlot(GrPlot* plot);
GrGpu* fGpu;
GrPixelConfig fPixelConfig;
GrTexture* fTexture;
// allocated array of GrPlots
GrPlot* fPlots;
// linked list of free GrPlots
GrPlot* fFreePlots;
};
class GrAtlas {
public:
GrAtlas(GrAtlasMgr* mgr) : fPlots(NULL), fAtlasMgr(mgr) { }
~GrAtlas() { fAtlasMgr->deletePlotList(fPlots); }
bool isEmpty() { return NULL == fPlots; }
private:
GrPlot* fPlots;
GrAtlasMgr* fAtlasMgr;
friend class GrAtlasMgr;
};
#endif
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