/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the Collabora Office 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 <svsys.h>

#include <comphelper/windowserrorstring.hxx>

#include <vcl/sysdata.hxx>

#include <win/wincomp.hxx>
#include <win/saldata.hxx>
#include <win/salinst.h>
#include <win/salgdi.h>
#include <win/salvd.h>
#include <sal/log.hxx>
#include <o3tl/temporary.hxx>

HBITMAP WinSalVirtualDevice::ImplCreateVirDevBitmap(HDC hDC, tools::Long nDX, tools::Long nDY, sal_uInt16 nBitCount, void **ppData, bool bAlphaMaskTransparent)
{
    HBITMAP hBitmap;

    if (nBitCount == 0)
        nBitCount = static_cast<WORD>(GetDeviceCaps(hDC, BITSPIXEL));

    // #146839# Don't use CreateCompatibleBitmap() - there seem to
    // be built-in limits for those HBITMAPs, at least this fails
    // rather often on large displays/multi-monitor setups.
    BITMAPINFO aBitmapInfo;
    aBitmapInfo.bmiHeader.biSize = sizeof( BITMAPINFOHEADER );
    aBitmapInfo.bmiHeader.biWidth = nDX;
    aBitmapInfo.bmiHeader.biHeight = -nDY; // negative for top-down bitmap
    aBitmapInfo.bmiHeader.biPlanes = 1;
    aBitmapInfo.bmiHeader.biBitCount = nBitCount;
    aBitmapInfo.bmiHeader.biCompression = BI_RGB;
    aBitmapInfo.bmiHeader.biSizeImage = 0;
    aBitmapInfo.bmiHeader.biXPelsPerMeter = 0;
    aBitmapInfo.bmiHeader.biYPelsPerMeter = 0;
    aBitmapInfo.bmiHeader.biClrUsed = 0;
    aBitmapInfo.bmiHeader.biClrImportant = 0;

    void* pData = nullptr;
    hBitmap = CreateDIBSection( hDC, &aBitmapInfo,
                                DIB_RGB_COLORS, &pData, nullptr,
                                0 );
    SAL_WARN_IF( !hBitmap, "vcl", "CreateDIBSection failed: " << comphelper::WindowsErrorString( GetLastError() ) );

    if (hBitmap)
    {
        if (bAlphaMaskTransparent)
        {
            assert(nBitCount == 32);
            memset(pData, nDX * nDY * 4, 0);
        }

        if (ppData)
            *ppData = pData;
    }

    return hBitmap;
}

std::unique_ptr<SalVirtualDevice> WinSalInstance::CreateVirtualDevice( SalGraphics& rSGraphics,
                                                       tools::Long nDX, tools::Long nDY,
                                                       DeviceFormat eFormat,
                                                       bool bAlphaMaskTransparent )
{
    WinSalGraphics& rGraphics = static_cast<WinSalGraphics&>(rSGraphics);

    HDC hDC = CreateCompatibleDC( rGraphics.getHDC() );
    SAL_WARN_IF( !hDC, "vcl", "CreateCompatibleDC failed: " << comphelper::WindowsErrorString( GetLastError() ) );

    if (!hDC)
        return nullptr;

    const sal_uInt16 nBitCount = eFormat == DeviceFormat::WITHOUT_ALPHA ? 0 : 32;
    // #124826# continue even if hBmp could not be created
    // if we would return a failure in this case, the process
    // would terminate which is not required
    HBITMAP hBmp = WinSalVirtualDevice::ImplCreateVirDevBitmap(rGraphics.getHDC(),
                                                           nDX, nDY, nBitCount,
                                                           &o3tl::temporary<void*>(nullptr),
                                                           bAlphaMaskTransparent);

    auto pVDev = std::make_unique<WinSalVirtualDevice>(hDC, hBmp, nBitCount,
                                                       /*bForeignDC*/false, nDX, nDY, rGraphics.isScreen());

    return pVDev;
}

std::unique_ptr<SalVirtualDevice> WinSalInstance::CreateVirtualDevice( SalGraphics& rSGraphics,
                                                       tools::Long &nDX, tools::Long &nDY,
                                                       DeviceFormat /*eFormat*/,
                                                       const SystemGraphicsData& rData )
{
    WinSalGraphics& rGraphics = static_cast<WinSalGraphics&>(rSGraphics);

    HDC hDC = rData.hDC ? rData.hDC : GetDC(rData.hWnd);
    if (hDC)
    {
        nDX = GetDeviceCaps( hDC, HORZRES );
        nDY = GetDeviceCaps( hDC, VERTRES );
    }
    else
    {
        nDX = 0;
        nDY = 0;
    }

    if (!hDC)
        return nullptr;

    const sal_uInt16 nBitCount = 0;
    const bool bForeignDC = rData.hDC != nullptr;

    auto pVDev = std::make_unique<WinSalVirtualDevice>(hDC, /*hBmp*/nullptr, nBitCount,
                                                       bForeignDC, nDX, nDY,  rGraphics.isScreen());

    return pVDev;
}

WinSalVirtualDevice::WinSalVirtualDevice(HDC hDC, HBITMAP hBMP, sal_uInt16 nBitCount, bool bForeignDC, tools::Long nWidth, tools::Long nHeight, bool bIsScreen)
    : mhLocalDC(hDC),          // HDC or 0 for Cache Device
      mhBmp(hBMP),             // Memory Bitmap
      mnBitCount(nBitCount),   // BitCount (0 or 1)
      mbGraphicsAcquired(false), // is Graphics used
      mbForeignDC(bForeignDC), // uses a foreign DC instead of a bitmap
      mnWidth(nWidth),
      mnHeight(nHeight)
{
    // Default Bitmap
    if (hBMP)
        mhDefBmp = SelectBitmap(hDC, hBMP);
    else
        mhDefBmp = nullptr;

    // insert VirDev into list of virtual devices
    SalData* pSalData = GetSalData();
    mpNext = pSalData->mpFirstVD;
    pSalData->mpFirstVD = this;

    WinSalGraphics* pVirGraphics = new WinSalGraphics(WinSalGraphics::VIRTUAL_DEVICE,
                                                      bIsScreen, nullptr, this);

    // by default no! mirroring for VirtualDevices, can be enabled with EnableRTL()
    pVirGraphics->SetLayout( SalLayoutFlags::NONE );
    pVirGraphics->setHDC(hDC);

    setGraphics(pVirGraphics);
}



WinSalVirtualDevice::~WinSalVirtualDevice()
{
    // remove VirDev from list of virtual devices
    SalData* pSalData = GetSalData();
    WinSalVirtualDevice** ppVirDev = &pSalData->mpFirstVD;
    for(; (*ppVirDev != this) && *ppVirDev; ppVirDev = &(*ppVirDev)->mpNext );
    if( *ppVirDev )
        *ppVirDev = mpNext;

    HDC hDC = mpGraphics->getHDC();
    // restore the mpGraphics' original HDC values, so the HDC can be deleted in the !mbForeignDC case
    mpGraphics->setHDC(nullptr);

    if( mhDefBmp )
        SelectBitmap(hDC, mhDefBmp);
    if( !mbForeignDC )
        DeleteDC(hDC);
}

SalGraphics* WinSalVirtualDevice::AcquireGraphics()
{
    if ( mbGraphicsAcquired )
        return nullptr;

    if ( mpGraphics )
        mbGraphicsAcquired = true;

    return mpGraphics.get();
}

void WinSalVirtualDevice::ReleaseGraphics( SalGraphics* )
{
    mbGraphicsAcquired = false;
}

bool WinSalVirtualDevice::SetSize( tools::Long nDX, tools::Long nDY, bool bAlphaMaskTransparent )
{
    if( mbForeignDC || !mhBmp )
        return true;    // ???

    HBITMAP hNewBmp = ImplCreateVirDevBitmap(getHDC(), nDX, nDY, mnBitCount,
                                             &o3tl::temporary<void*>(nullptr), bAlphaMaskTransparent);
    if (!hNewBmp)
    {
        mnWidth = 0;
        mnHeight = 0;
        return false;
    }

    mnWidth = nDX;
    mnHeight = nDY;

    SelectBitmap(getHDC(), hNewBmp);
    mhBmp.reset(hNewBmp);

    return true;
}

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