/* -*- 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/.

 *

 */

#pragma once

#include <vcl/BitmapReadAccess.hxx>

#include <optional>

class AlphaMask;

class Bitmap;

class Color;

class Point;

namespace tools

{

class Rectangle;

}

class VCL_DLLPUBLIC BitmapWriteAccess final : public BitmapReadAccess

{

public:

    BitmapWriteAccess(Bitmap& rBitmap);

    BitmapWriteAccess(AlphaMask& rBitmap);

    virtual ~BitmapWriteAccess() override;

    SAL_DLLPRIVATE void CopyScanline(tools::Long nY, const BitmapReadAccess& rReadAcc);

    SAL_DLLPRIVATE void CopyScanline(tools::Long nY, ConstScanline aSrcScanline,

                                     ScanlineFormat nSrcScanlineFormat,

                                     sal_uInt32 nSrcScanlineSize);

    void SetPalette(const BitmapPalette& rPalette)

    {

        assert(mpBuffer && "Access is not valid!");

        mpBuffer->maPalette = rPalette;

    }

    void SetPaletteEntryCount(sal_uInt16 nCount)

    {

        assert(mpBuffer && "Access is not valid!");

        mpBuffer->maPalette.SetEntryCount(nCount);

    }

    void SetPaletteColor(sal_uInt16 nColor, const BitmapColor& rBitmapColor)

    {

        assert(mpBuffer && "Access is not valid!");

        assert(HasPalette() && "Bitmap has no palette!");

        mpBuffer->maPalette[nColor] = rBitmapColor;

    }

    void SetPixel(tools::Long nY, tools::Long nX, const BitmapColor& rBitmapColor)

    {

        assert(mpBuffer && "Access is not valid!");

        assert(nX < mpBuffer->mnWidth && "x-coordinate out of range!");

        assert(nY < mpBuffer->mnHeight && "y-coordinate out of range!");

        mFncSetPixel(GetScanline(nY), nX, rBitmapColor);

    }

    void SetPixelIndex(tools::Long nY, tools::Long nX, sal_uInt8 cIndex)

    {

        SetPixel(nY, nX, BitmapColor(cIndex));

    }

    void SetLineColor(const Color& rColor);

    void SetFillColor();

    void SetFillColor(const Color& rColor);

    void Erase(const Color& rColor);

    SAL_DLLPRIVATE void DrawLine(const Point& rStart, const Point& rEnd);

    void FillRect(const tools::Rectangle& rRect);

    void DrawRect(const tools::Rectangle& rRect);

private:

    std::optional<BitmapColor> mpLineColor;

    std::optional<BitmapColor> mpFillColor;

    BitmapWriteAccess() = delete;

    BitmapWriteAccess(const BitmapWriteAccess&) = delete;

    BitmapWriteAccess& operator=(const BitmapWriteAccess&) = delete;

};

class BitmapScopedWriteAccess

{

public:

    BitmapScopedWriteAccess(Bitmap& rBitmap)

        : moAccess(rBitmap)

    {

    }

    BitmapScopedWriteAccess(AlphaMask& rBitmap)

        : moAccess(rBitmap)

    {

    }

    BitmapScopedWriteAccess() {}

    BitmapScopedWriteAccess& operator=(Bitmap& rBitmap)

    {

        moAccess.emplace(rBitmap);

        return *this;

    }

    BitmapScopedWriteAccess& operator=(AlphaMask& rBitmap)

    {

        moAccess.emplace(rBitmap);

        return *this;

    }

    bool operator!() const { return !moAccess.has_value() || !*moAccess; }

    explicit operator bool() const { return moAccess && bool(*moAccess); }

    void reset() { moAccess.reset(); }

    BitmapWriteAccess* get() { return moAccess ? &*moAccess : nullptr; }

    const BitmapWriteAccess* get() const { return moAccess ? &*moAccess : nullptr; }

    BitmapWriteAccess* operator->() { return &*moAccess; }

    const BitmapWriteAccess* operator->() const { return &*moAccess; }

    BitmapWriteAccess& operator*() { return *moAccess; }

    const BitmapWriteAccess& operator*() const { return *moAccess; }

private:

    std::optional<BitmapWriteAccess> moAccess;

};

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