src/gpu/GrDrawingManager.h

/*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef GrDrawingManager_DEFINED
#define GrDrawingManager_DEFINED

#include "SkTDArray.h"

class GrContext;
class GrDrawContext;
class GrTextContext;

// Currently the DrawingManager creates a separate GrTextContext for each
// combination of text drawing options (pixel geometry x DFT use)
// and hands the appropriate one back given the DrawContext's request.
//
// It allocates a new GrDrawContext for each GrRenderTarget
// but all of them still land in the same GrDrawTarget!
//
// In the future this class will allocate a new GrDrawContext for
// each GrRenderTarget/GrDrawTarget and manage the DAG.
class GrDrawingManager {
public:
    ~GrDrawingManager();

    bool abandoned() const { return fAbandoned; }

    GrDrawContext* drawContext(GrRenderTarget* rt, const SkSurfaceProps* surfaceProps);

    GrTextContext* textContext(const SkSurfaceProps& props, GrRenderTarget* rt);

    // The caller automatically gets a ref on the returned drawTarget. It must 
    // be balanced by an unref call.
    GrDrawTarget* newDrawTarget(GrRenderTarget* rt);

    GrContext* getContext() { return fContext; }

private:
    GrDrawingManager(GrContext* context)
        : fContext(context)
        , fAbandoned(false)
        , fNVPRTextContext(nullptr) {
        sk_bzero(fTextContexts, sizeof(fTextContexts));
    }

    void abandon();
    void cleanup();
    void reset();
    void flush();

    friend class GrContext;  // for access to: ctor, abandon, reset & flush

    static const int kNumPixelGeometries = 5; // The different pixel geometries
    static const int kNumDFTOptions = 2;      // DFT or no DFT

    GrContext*        fContext;

    bool              fAbandoned;
    SkTDArray<GrDrawTarget*> fDrawTargets;

    GrTextContext*    fNVPRTextContext;
    GrTextContext*    fTextContexts[kNumPixelGeometries][kNumDFTOptions];
};

#endif