/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#ifndef INCLUDED_VCL_INC_OPENGL_WIN_GDIIMPL_HXX
#define INCLUDED_VCL_INC_OPENGL_WIN_GDIIMPL_HXX

#include <memory>
#include <vcl/dllapi.h>

#include <opengl/gdiimpl.hxx>
#include <svdata.hxx>
#include <win/salgdi.h>
#include <win/wingdiimpl.hxx>
#include <o3tl/lru_map.hxx>
#include <vcl/opengl/OpenGLContext.hxx>
#include <ControlCacheKey.hxx>

class OpenGLCompatibleDC : public CompatibleDC
{
public:
    OpenGLCompatibleDC(SalGraphics &rGraphics, int x, int y, int width, int height);

    virtual std::unique_ptr<Texture> getAsMaskTexture() override;
    // caller must delete
    OpenGLTexture* getOpenGLTexture();

    virtual bool copyToTexture(Texture& aTexture) override;

    struct Texture;
};

struct OpenGLCompatibleDC::Texture : public CompatibleDC::Texture
{
    OpenGLTexture texture;
    virtual bool isValid() const { return !!texture; }
    virtual int GetWidth() const { return texture.GetWidth(); }
    virtual int GetHeight() const { return texture.GetHeight(); }
};

class WinOpenGLSalGraphicsImpl : public OpenGLSalGraphicsImpl, public WinSalGraphicsImplBase
{
    friend class WinLayout;
private:
    WinSalGraphics& mrWinParent;

    bool RenderCompatibleDC(OpenGLCompatibleDC& rWhite, OpenGLCompatibleDC& rBlack,
                            int nX, int nY, TextureCombo& rCombo);

public:
    WinOpenGLSalGraphicsImpl(WinSalGraphics& rGraphics,
                             SalGeometryProvider *mpProvider);

protected:
    virtual rtl::Reference<OpenGLContext> CreateWinContext() override;

    bool RenderTextureCombo(TextureCombo const & rCombo, int nX, int nY);

public:
    virtual void Init() override;
    virtual void copyBits( const SalTwoRect& rPosAry, SalGraphics* pSrcGraphics ) override;

    virtual bool UseTextDraw() const override { return true; }
    virtual void PreDrawText() override;
    virtual void PostDrawText() override;
    virtual void DrawTextMask( CompatibleDC::Texture* rTexture, Color nMaskColor, const SalTwoRect& rPosAry ) override;
    using OpenGLSalGraphicsImpl::DrawMask;
    virtual void DeferredTextDraw(const CompatibleDC::Texture* pTexture, Color nMaskColor, const SalTwoRect& rPosAry) override;

    virtual bool UseRenderNativeControl() const { return true; }
    virtual bool TryRenderCachedNativeControl(ControlCacheKey const & rControlCacheKey, int nX, int nY) override;
    virtual bool RenderAndCacheNativeControl(CompatibleDC& rWhite, CompatibleDC& rBlack,
                                     int nX, int nY , ControlCacheKey& aControlCacheKey) override;

};

struct ControlCacheHashFunction
{
    std::size_t operator()(ControlCacheKey const& aCache) const
    {
        std::size_t seed = 0;
        boost::hash_combine(seed, aCache.mnType);
        boost::hash_combine(seed, aCache.mnPart);
        boost::hash_combine(seed, aCache.mnState);
        boost::hash_combine(seed, aCache.maSize.Width());
        boost::hash_combine(seed, aCache.maSize.Height());
        return seed;
    }
};

typedef std::pair<ControlCacheKey, std::unique_ptr<TextureCombo>> ControlCachePair;
typedef o3tl::lru_map<ControlCacheKey, std::unique_ptr<TextureCombo>, ControlCacheHashFunction> ControlCacheType;

class TheTextureCache {
    ControlCacheType cache;

    TheTextureCache();

public:
    static ControlCacheType & get();
};

#endif

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