/*
 * 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 <vcl/bitmap.hxx>
#include <vcl/BitmapAccessMode.hxx>
#include <vcl/BitmapBuffer.hxx>
#include <vcl/BitmapPalette.hxx>
#include <vcl/Scanline.hxx>
#include <com/sun/star/beans/XFastPropertySet.hpp>
#include <win/wincomp.hxx>
#include <win/salgdi.h>
#include <win/saldata.hxx>
#include <win/salbmp.h>
#include <string.h>
#include <vcl/timer.hxx>
#include <cppuhelper/basemutex.hxx>
#include <sal/log.hxx>
#include <tools/helpers.hxx>
#include <map>

#include <prewin.h>
#include <gdiplus.h>
#include <postwin.h>

#if defined _MSC_VER
#undef min
#undef max
#endif

WinSalBitmap::WinSalBitmap()
:   SalBitmap(),
    maSize(),
    mpDIB(nullptr),
    mhDDB(nullptr),
    mnBitCount(0)
{
}

WinSalBitmap::~WinSalBitmap()
{
    Destroy();
}

void WinSalBitmap::Destroy()
{
    if( mpDIB )
        free( mpDIB );
    else if( mhDDB )
        DeleteObject( mhDDB );

    maSize = Size();
    mnBitCount = 0;
}

namespace {

class SystemDependentData_GdiPlusBitmap : public basegfx::SystemDependentData
{
private:
    std::shared_ptr<Gdiplus::Bitmap>    mpGdiPlusBitmap;

public:
    SystemDependentData_GdiPlusBitmap(
        const std::shared_ptr<Gdiplus::Bitmap>& rGdiPlusBitmap);

    const std::shared_ptr<Gdiplus::Bitmap>& getGdiPlusBitmap() const { return mpGdiPlusBitmap; }

    virtual sal_Int64 estimateUsageInBytes() const override;
};

}

SystemDependentData_GdiPlusBitmap::SystemDependentData_GdiPlusBitmap(
    const std::shared_ptr<Gdiplus::Bitmap>& rGdiPlusBitmap)
:   basegfx::SystemDependentData(
        Application::GetSystemDependentDataManager(),
        basegfx::SDD_Type::SDDType_GdiPlusBitmap),
    mpGdiPlusBitmap(rGdiPlusBitmap)
{
}

sal_Int64 SystemDependentData_GdiPlusBitmap::estimateUsageInBytes() const
{
    if(!mpGdiPlusBitmap)
        return 0;

    const UINT nWidth(mpGdiPlusBitmap->GetWidth());
    const UINT nHeight(mpGdiPlusBitmap->GetHeight());

    if(0 == nWidth || 0 == nHeight)
        return 0;

    sal_Int64 nRetval = nWidth * nHeight;

    switch(mpGdiPlusBitmap->GetPixelFormat())
    {
        case PixelFormat1bppIndexed:
            nRetval /= 8;
            break;
        case PixelFormat4bppIndexed:
            nRetval /= 4;
            break;
        case PixelFormat16bppGrayScale:
        case PixelFormat16bppRGB555:
        case PixelFormat16bppRGB565:
        case PixelFormat16bppARGB1555:
            nRetval *= 2;
            break;
        case PixelFormat24bppRGB:
            nRetval *= 3;
            break;
        case PixelFormat32bppRGB:
        case PixelFormat32bppARGB:
        case PixelFormat32bppPARGB:
        case PixelFormat32bppCMYK:
            nRetval *= 4;
            break;
        case PixelFormat48bppRGB:
            nRetval *= 6;
            break;
        case PixelFormat64bppARGB:
        case PixelFormat64bppPARGB:
            nRetval *= 8;
            break;
        default:
        case PixelFormat8bppIndexed:
            break;
    }

    return nRetval;
}

std::shared_ptr< Gdiplus::Bitmap > WinSalBitmap::ImplGetGdiPlusBitmap() const
{
    std::shared_ptr< Gdiplus::Bitmap > aRetval;

    // try to access buffered data
    std::shared_ptr<SystemDependentData_GdiPlusBitmap> pSystemDependentData_GdiPlusBitmap(
        getSystemDependentData<SystemDependentData_GdiPlusBitmap>(basegfx::SDD_Type::SDDType_GdiPlusBitmap));

    if(pSystemDependentData_GdiPlusBitmap)
    {
        // use from buffer
        aRetval = pSystemDependentData_GdiPlusBitmap->getGdiPlusBitmap();
    }
    else if(!maSize.IsEmpty())
    {
        // add to buffering mechanism
        addOrReplaceSystemDependentData<SystemDependentData_GdiPlusBitmap>(
            aRetval);
    }

    return aRetval;
}

bool WinSalBitmap::Create( HBITMAP hBitmap )
{
    assert(hBitmap);
    assert(!mpDIB && "already created");
    assert(!mhDDB && "already created");

    BITMAP  aDDBInfo;
    if( !GetObjectW( hBitmap, sizeof( aDDBInfo ), &aDDBInfo ) )
        return false;

    mhDDB = hBitmap;
    maSize = Size( aDDBInfo.bmWidth, aDDBInfo.bmHeight );
    mnBitCount = aDDBInfo.bmPlanes * aDDBInfo.bmBitsPixel;

    return true;
}

bool WinSalBitmap::Create(const Size& rSize, vcl::PixelFormat ePixelFormat, const BitmapPalette& rPal)
{
    assert(!mpDIB && "already created");
    assert(!mhDDB && "already created");

    void* pDIB = nullptr;
    sal_Int32 nDIBSize = 0;
    ImplCreateDIB(rSize, ePixelFormat, rPal, pDIB, nDIBSize);

    if( !pDIB )
        return false;

    mpDIB = pDIB;
    mnDIBSize = nDIBSize;
    maSize = rSize;
    mnBitCount = vcl::pixelFormatBitCount(ePixelFormat);

    return true;
}

bool WinSalBitmap::Create( const SalBitmap& rSSalBitmap )
{
    assert(!mpDIB && "already created");
    assert(!mhDDB && "already created");

    const WinSalBitmap& rSalBitmap = static_cast<const WinSalBitmap&>(rSSalBitmap);

    if (rSalBitmap.mpDIB)
    {
        void* pNew = ImplCopyDIB( rSalBitmap.mpDIB, rSalBitmap.mnDIBSize );
        if ( !pNew )
            return false;

        mpDIB = pNew;
        mnDIBSize = rSalBitmap.mnDIBSize;
        maSize = rSalBitmap.maSize;
        mnBitCount = rSalBitmap.mnBitCount;

        return true;
    }
    else if (rSalBitmap.mhDDB)
    {
        HBITMAP hNewHdl = ImplCopyDDB( rSalBitmap.mhDDB );
        if ( !hNewHdl )
            return false;

        mhDDB = hNewHdl;
        maSize = rSalBitmap.maSize;
        mnBitCount = rSalBitmap.mnBitCount;

        return true;
    }
    else
        return false;
}

bool WinSalBitmap::Create( const SalBitmap& rSSalBmp, SalGraphics& rSGraphics )
{
    assert(!mpDIB && "already created");
    assert(!mhDDB && "already created");

    const WinSalBitmap& rSalBmp = static_cast<const WinSalBitmap&>(rSSalBmp);
    if(!rSalBmp.mpDIB)
        return false;

    PBITMAPINFO pBI = static_cast<PBITMAPINFO>(mpDIB);
    if (!pBI)
        return false;

    bool bRet = false;
    WinSalGraphics* pGraphics = static_cast<WinSalGraphics*>(&rSGraphics);

    HDC                 hDC  = pGraphics->getHDC();
    BITMAP              aDDBInfo;
    PBYTE               pBits = reinterpret_cast<PBYTE>(pBI) + pBI->bmiHeader.biSize +
                                ImplGetDIBColorCount( rSalBmp.mpDIB ) * sizeof( RGBQUAD );
    HBITMAP hNewDDB = CreateDIBitmap( hDC, &pBI->bmiHeader, CBM_INIT, pBits, pBI, DIB_RGB_COLORS );

    if( hNewDDB && GetObjectW( hNewDDB, sizeof( aDDBInfo ), &aDDBInfo ) )
    {
        mhDDB = hNewDDB;
        maSize = Size( aDDBInfo.bmWidth, aDDBInfo.bmHeight );
        mnBitCount = aDDBInfo.bmPlanes * aDDBInfo.bmBitsPixel;

        bRet = true;
    }
    else if( hNewDDB )
        DeleteObject( hNewDDB );

    return bRet;
}

sal_uInt16 WinSalBitmap::ImplGetDIBColorCount( HGLOBAL hDIB )
{
    if (!hDIB)
        return 0;

    PBITMAPINFO  pBI = static_cast<PBITMAPINFO>(GlobalLock( hDIB ));
    if (!pBI)
        return 0;

    sal_uInt16 nColors = 0;
    if ( pBI->bmiHeader.biSize != sizeof( BITMAPCOREHEADER ) )
    {
        if( pBI->bmiHeader.biBitCount <= 8 )
        {
            if ( pBI->bmiHeader.biClrUsed )
                nColors = static_cast<sal_uInt16>(pBI->bmiHeader.biClrUsed);
            else
                nColors = 1 << pBI->bmiHeader.biBitCount;
        }
    }
    else if( reinterpret_cast<PBITMAPCOREHEADER>(pBI)->bcBitCount <= 8 )
        nColors = 1 << reinterpret_cast<PBITMAPCOREHEADER>(pBI)->bcBitCount;

    GlobalUnlock( hDIB );

    return nColors;
}

void WinSalBitmap::ImplCreateDIB(const Size& rSize, vcl::PixelFormat ePixelFormat, const BitmapPalette& rPal,
                                    void*& rpDIB, sal_Int32 &rnDIBSize)
{
    rpDIB = nullptr;

    if( rSize.IsEmpty() )
        return;

    const auto nBits = vcl::pixelFormatBitCount(ePixelFormat);

    // calculate bitmap size in Bytes
    const sal_uLong nAlignedWidth4Bytes = AlignedWidth4Bytes(nBits * rSize.Width());
    const sal_uLong nImageSize = nAlignedWidth4Bytes * rSize.Height();
    bool bOverflow = (nImageSize / nAlignedWidth4Bytes) != static_cast<sal_uLong>(rSize.Height());
    if( bOverflow )
        return;

    // allocate bitmap memory including header and palette
    sal_uInt16 nColors = 0;
    if (ePixelFormat <= vcl::PixelFormat::N8_BPP)
        nColors = vcl::numberOfColors(ePixelFormat);

    const sal_uLong nHeaderSize = sizeof( BITMAPINFOHEADER ) + nColors * sizeof( RGBQUAD );
    bOverflow = (nHeaderSize + nImageSize) < nImageSize;
    if( bOverflow )
        return;

    rpDIB = malloc( nHeaderSize + nImageSize );
    if( !rpDIB )
        return;
    rnDIBSize = nHeaderSize + nImageSize;

    PBITMAPINFO pBI = static_cast<PBITMAPINFO>( rpDIB );
    PBITMAPINFOHEADER pBIH = reinterpret_cast<PBITMAPINFOHEADER>( pBI );

    pBIH->biSize = sizeof( BITMAPINFOHEADER );
    pBIH->biWidth = rSize.Width();
    pBIH->biHeight = rSize.Height();
    pBIH->biPlanes = 1;
    pBIH->biBitCount = nBits;
    pBIH->biCompression = BI_RGB;
    pBIH->biSizeImage = nImageSize;
    pBIH->biXPelsPerMeter = 0;
    pBIH->biYPelsPerMeter = 0;
    pBIH->biClrUsed = 0;
    pBIH->biClrImportant = 0;

    if( nColors )
    {
        // copy the palette entries if any
        const sal_uInt16 nMinCount = std::min( nColors, rPal.GetEntryCount() );
        if( nMinCount )
            memcpy( pBI->bmiColors, rPal.ImplGetColorBuffer(), nMinCount * sizeof(RGBQUAD) );
    }
}

HBITMAP WinSalBitmap::ImplCopyDDB( HBITMAP hHdl )
{
    HBITMAP  hCopy = nullptr;

    if ( hHdl )
    {
        BITMAP aBmp;

        // find out size of source bitmap
        GetObjectW( hHdl, sizeof( aBmp ), &aBmp );

        // create destination bitmap
        if ( (hCopy = CreateBitmapIndirect( &aBmp )) != nullptr )
        {
            HDC     hBmpDC = CreateCompatibleDC( nullptr );
            HBITMAP hBmpOld = static_cast<HBITMAP>(SelectObject( hBmpDC, hHdl ));
            HDC     hCopyDC = CreateCompatibleDC( hBmpDC );
            HBITMAP hCopyOld = static_cast<HBITMAP>(SelectObject( hCopyDC, hCopy ));

            BitBlt( hCopyDC, 0, 0, aBmp.bmWidth, aBmp.bmHeight, hBmpDC, 0, 0, SRCCOPY );

            SelectObject( hCopyDC, hCopyOld );
            DeleteDC( hCopyDC );

            SelectObject( hBmpDC, hBmpOld );
            DeleteDC( hBmpDC );
        }
    }

    return hCopy;
}

void* WinSalBitmap::ImplCopyDIB( void* pDIB, sal_Int32 nSize )
{
    void*  pCopy = nullptr;

    if ( pDIB )
    {
        pCopy = malloc(nSize);
        if ( pCopy )
            memcpy( pCopy, pDIB, nSize );
    }

    return pCopy;
}

ScanlineFormat WinSalBitmap::GetScanlineFormat() const
{
    if (!mpDIB)
        return ScanlineFormat::NONE;

    PBITMAPINFO pBI = static_cast<PBITMAPINFO>(mpDIB);
    if (!pBI)
        return ScanlineFormat::NONE;

    PBITMAPINFOHEADER pBIH = &pBI->bmiHeader;
    if( pBIH->biPlanes != 1 )
        return ScanlineFormat::NONE;

    return pBIH->biBitCount == 8 ? ScanlineFormat::N8BitPal :
           pBIH->biBitCount == 24 ? ScanlineFormat::N24BitTcBgr :
           pBIH->biBitCount == 32 ? ScanlineFormat::N32BitTcBgra :
           ScanlineFormat::NONE;
}

BitmapBuffer* WinSalBitmap::AcquireBuffer( BitmapAccessMode /*nMode*/ )
{
    if (!mpDIB)
        return nullptr;

    PBITMAPINFO pBI = static_cast<PBITMAPINFO>(mpDIB);
    if (!pBI)
        return nullptr;

    std::unique_ptr<BitmapBuffer> pBuffer;
    PBITMAPINFOHEADER   pBIH = &pBI->bmiHeader;

    if( pBIH->biPlanes == 1 )
    {
        pBuffer.reset(new BitmapBuffer);

        pBuffer->meFormat = GetScanlineFormat();
        assert (pBuffer->meFormat != ScanlineFormat::NONE);

        if (pBuffer->meFormat != ScanlineFormat::NONE)
        {
            pBuffer->mnWidth = maSize.Width();
            pBuffer->mnHeight = maSize.Height();
            pBuffer->mnScanlineSize = AlignedWidth4Bytes( maSize.Width() * pBIH->biBitCount );
            pBuffer->mnBitCount = static_cast<sal_uInt16>(pBIH->biBitCount);

            if( pBuffer->mnBitCount <= 8 )
            {
                const sal_uInt16 nPalCount = ImplGetDIBColorCount( mpDIB );

                pBuffer->maPalette.SetEntryCount( nPalCount );
                memcpy( pBuffer->maPalette.ImplGetColorBuffer(), pBI->bmiColors, nPalCount * sizeof( RGBQUAD ) );
                pBuffer->mpBits = reinterpret_cast<PBYTE>(pBI) + pBI->bmiHeader.biSize + nPalCount * sizeof( RGBQUAD );
            }
            else
                pBuffer->mpBits = reinterpret_cast<PBYTE>(pBI) + pBI->bmiHeader.biSize;
        }
        else
        {
            pBuffer.reset();
        }
    }

    return pBuffer.release();
}

void WinSalBitmap::ReleaseBuffer( BitmapBuffer* pBuffer, BitmapAccessMode nMode )
{
    if( pBuffer )
    {
        if( mpDIB )
        {
            if( nMode == BitmapAccessMode::Write && !!pBuffer->maPalette )
            {
                if (PBITMAPINFO pBI = static_cast<PBITMAPINFO>(mpDIB))
                {
                    const sal_uInt16    nCount = pBuffer->maPalette.GetEntryCount();
                    const sal_uInt16    nDIBColorCount = ImplGetDIBColorCount( mpDIB );
                    memcpy( pBI->bmiColors, pBuffer->maPalette.ImplGetColorBuffer(), std::min( nDIBColorCount, nCount ) * sizeof( RGBQUAD ) );
                }
            }
        }

        delete pBuffer;
    }
    if( nMode == BitmapAccessMode::Write )
        InvalidateChecksum();
}

bool WinSalBitmap::GetSystemData( BitmapSystemData& rData )
{
    bool bRet = false;
    if( mpDIB || mhDDB )
    {
        bRet = true;
        rData.pDIB = mpDIB;
        const Size& rSize = GetSize ();
        rData.mnWidth = rSize.Width();
        rData.mnHeight = rSize.Height();
    }
    return bRet;
}

bool WinSalBitmap::ScalingSupported() const
{
    return false;
}

bool WinSalBitmap::Scale( const double& /*rScaleX*/, const double& /*rScaleY*/, BmpScaleFlag /*nScaleFlag*/ )
{
    return false;
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */