/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */

/*

 * 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/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (the "License"); you may not use this file

 *   except in compliance with the License. You may obtain a copy of

 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .

 */

#include <osl/diagnose.h>

#include <tools/long.hxx>

#include <tools/mapunit.hxx>

#include <vcl/rendercontext/ImplMapRes.hxx>

#include <vcl/mapmod.hxx>

#include <vcl/vclptr.hxx>

#include <vcl/virdev.hxx>

#include <vcl/wrkwin.hxx>

#include <svdata.hxx>

void ImplMapRes::SetMapRes(const o3tl::Length eUnit)

{

    const auto[nNum, nDen] = o3tl::getConversionMulDiv(eUnit, o3tl::Length::in);

    mfMapScX = mfMapScY = double(nNum) / nDen;

};

void ImplMapRes::CalcMapResolution(const MapMode& rMapMode, tools::Long nDPIX, tools::Long nDPIY)

{

    switch (rMapMode.GetMapUnit())

    {

        case MapUnit::MapRelative:

            break;

        case MapUnit::Map100thMM:

            SetMapRes(o3tl::Length::mm100);

            break;

        case MapUnit::Map10thMM:

            SetMapRes(o3tl::Length::mm10);

            break;

        case MapUnit::MapMM:

            SetMapRes(o3tl::Length::mm);

            break;

        case MapUnit::MapCM:

            SetMapRes(o3tl::Length::cm);

            break;

        case MapUnit::Map1000thInch:

            SetMapRes(o3tl::Length::in1000);

            break;

        case MapUnit::Map100thInch:

            SetMapRes(o3tl::Length::in100);

            break;

        case MapUnit::Map10thInch:

            SetMapRes(o3tl::Length::in10);

            break;

        case MapUnit::MapInch:

            SetMapRes(o3tl::Length::in);

            break;

        case MapUnit::MapPoint:

            SetMapRes(o3tl::Length::pt);

            break;

        case MapUnit::MapTwip:

            SetMapRes(o3tl::Length::twip);

            break;

        case MapUnit::MapPixel:

            mfMapScX = 1.0 / nDPIX;

            mfMapScY = 1.0 / nDPIY;

            break;

        case MapUnit::MapSysFont:

        case MapUnit::MapAppFont:

        {

            ImplSVData* pSVData = ImplGetSVData();

            if (!pSVData->maGDIData.mnAppFontX)

            {

                if (pSVData->maFrameData.mpFirstFrame)

                    vcl::Window::ImplInitAppFontData(pSVData->maFrameData.mpFirstFrame);

                else

                {

                    ScopedVclPtrInstance<WorkWindow> pWin(nullptr, 0);

                    vcl::Window::ImplInitAppFontData(pWin);

                }

            }

            mfMapScX = double(pSVData->maGDIData.mnAppFontX) / (nDPIX * 40);

            mfMapScY = double(pSVData->maGDIData.mnAppFontY) / (nDPIY * 80);

        }

        break;

        default:

            OSL_FAIL("unhandled MapUnit");

            break;

    }

    double fScaleX = rMapMode.GetScaleX();

    double fScaleY = rMapMode.GetScaleY();

    // set offset according to MapMode

    Point aOrigin = rMapMode.GetOrigin();

    if (rMapMode.GetMapUnit() != MapUnit::MapRelative)

    {

        mnMapOfsX = aOrigin.X();

        mnMapOfsY = aOrigin.Y();

    }

    else

    {

        auto funcCalcOffset = [](double fScale, tools::Long& rnMapOffset, tools::Long nOrigin) {

            assert(fScale != 0);

            rnMapOffset = std::llround(double(rnMapOffset) / fScale) + nOrigin;

        };

        funcCalcOffset(fScaleX, mnMapOfsX, aOrigin.X());

        funcCalcOffset(fScaleY, mnMapOfsY, aOrigin.Y());

    }

    // calculate scaling factor according to MapMode

    // aTemp? = rMapRes.mnMapSc? * aScale?

    mfMapScX = fScaleX * mfMapScX;

    mfMapScY = fScaleY * mfMapScY;

}

ImplMapRes ImplMapRes::ResolveMapRes(const MapMode* pMode, const MapMode& rDefaultMapMode,

                                     bool bMap, tools::Long nDPIX, tools::Long nDPIY)

{

    const MapMode* pEffectiveMode = pMode ? pMode : &rDefaultMapMode;

    if (bMap && pEffectiveMode == &rDefaultMapMode)

        return *this;

    ImplMapRes aRes;

    if (pEffectiveMode->GetMapUnit() == MapUnit::MapRelative)

        aRes = *this;

    aRes.CalcMapResolution(*pEffectiveMode, nDPIX, nDPIY);

    return aRes;

}

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