gpu/GrRectanizer.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 GrRectanizer_DEFINED
#define GrRectanizer_DEFINED

#include "GrPoint.h"

class GrRectanizerPurgeListener {
public:
    virtual ~GrRectanizerPurgeListener() {}

    virtual void notifyPurgeStrip(void*, int yCoord) = 0;
};

class GrRectanizer {
public:
    GrRectanizer(int width, int height) : fWidth(width), fHeight(height) {
        SkASSERT(width >= 0);
        SkASSERT(height >= 0);
    }

    virtual ~GrRectanizer() {}

    virtual void reset() = 0;

    int width() const { return fWidth; }
    int height() const { return fHeight; }

    virtual bool addRect(int width, int height, GrIPoint16* loc) = 0;
    virtual float percentFull() const = 0;

    // return the Y-coordinate of a strip that should be purged, given height
    // i.e. return the oldest such strip, or some other criteria. Return -1
    // if there is no candidate
    virtual int stripToPurge(int height) const = 0;
    virtual void purgeStripAtY(int yCoord) = 0;

    /**
     *  Our factory, which returns the subclass du jour
     */
    static GrRectanizer* Factory(int width, int height);

private:
    int fWidth;
    int fHeight;
};

#endif