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/* -*- 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/.
*
* 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 <sal/config.h>
#include <basegfx/numeric/ftools.hxx>
#include <com/sun/star/lang/XServiceInfo.hpp>
#include <com/sun/star/rendering/XIntegerBitmap.hpp>
#include <tools/diagnose_ex.h>
#include <vcl/bitmap.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/BitmapReadAccess.hxx>
#include <vcl/canvastools.hxx>
#include "dx_impltools.hxx"
#include "dx_vcltools.hxx"
using namespace ::com::sun::star;
namespace dxcanvas::tools
{
namespace
{
/// Calc number of colors in given BitmapInfoHeader
sal_Int32 calcDIBColorCount( const BITMAPINFOHEADER& rBIH )
{
if( rBIH.biSize != sizeof( BITMAPCOREHEADER ) )
{
if( rBIH.biBitCount <= 8 )
{
if( rBIH.biClrUsed )
return rBIH.biClrUsed;
else
return 1 << rBIH.biBitCount;
}
}
else
{
BITMAPCOREHEADER const * pCoreHeader = reinterpret_cast<BITMAPCOREHEADER const *>(&rBIH);
if( pCoreHeader->bcBitCount <= 8 )
return 1 << pCoreHeader->bcBitCount;
}
return 0; // nothing known
}
/// Draw DI bits to given Graphics
bool drawDIBits( const std::shared_ptr< Gdiplus::Graphics >& rGraphics,
const void* hDIB )
{
bool bRet( false );
const BITMAPINFO* pBI = static_cast<BITMAPINFO*>(GlobalLock( const_cast<void *>(hDIB) ));
if( pBI )
{
const BYTE* pBits = reinterpret_cast<BYTE const *>(pBI) + pBI->bmiHeader.biSize +
calcDIBColorCount( pBI->bmiHeader ) * sizeof( RGBQUAD );
// forward to outsourced GDI+ rendering method
// (header clashes)
bRet = tools::drawDIBits( rGraphics, *pBI, pBits );
GlobalUnlock( const_cast<void *>(hDIB) );
}
return bRet;
}
/** Draw VCL bitmap to given Graphics
@param rBmp
Reference to bitmap. Might get modified, in such a way
that it will hold a DIB after a successful function call.
*/
bool drawVCLBitmap( const std::shared_ptr< Gdiplus::Graphics >& rGraphics,
::Bitmap& rBmp )
{
BitmapSystemData aBmpSysData;
if( !rBmp.GetSystemData( aBmpSysData ) ||
!aBmpSysData.pDIB )
{
// first of all, ensure that Bitmap contains a DIB, by
// acquiring a read access
BitmapReadAccess* pReadAcc = rBmp.AcquireReadAccess();
// TODO(P2): Acquiring a read access can actually
// force a read from VRAM, thus, avoiding this
// step somehow will increase performance
// here.
if( pReadAcc )
{
// try again: now, WinSalBitmap must have
// generated a DIB
if( rBmp.GetSystemData( aBmpSysData ) &&
aBmpSysData.pDIB )
{
return drawDIBits( rGraphics,
aBmpSysData.pDIB );
}
Bitmap::ReleaseAccess( pReadAcc );
}
}
else
{
return drawDIBits( rGraphics,
aBmpSysData.pDIB );
}
// failed to generate DIBits from vcl bitmap
return false;
}
/** Create a chunk of raw RGBA data GDI+ Bitmap from VCL BitmapEx
*/
RawRGBABitmap bitmapFromVCLBitmapEx( const ::BitmapEx& rBmpEx )
{
// TODO(P2): Avoid temporary bitmap generation, maybe
// even ensure that created DIBs are copied back to
// BmpEx (currently, every AcquireReadAccess() will
// make the local bitmap copy unique, effectively
// duplicating the memory used)
ENSURE_OR_THROW( rBmpEx.IsAlpha(),
"::dxcanvas::tools::bitmapFromVCLBitmapEx(): "
"BmpEx has no alpha" );
// convert transparent bitmap to 32bit RGBA
// ========================================
const ::Size aBmpSize( rBmpEx.GetSizePixel() );
RawRGBABitmap aBmpData;
aBmpData.mnWidth = aBmpSize.Width();
aBmpData.mnHeight = aBmpSize.Height();
aBmpData.maBitmapData.resize(4*aBmpData.mnWidth*aBmpData.mnHeight);
Bitmap aBitmap( rBmpEx.GetBitmap() );
Bitmap::ScopedReadAccess pReadAccess( aBitmap );
const sal_Int32 nWidth( aBmpSize.Width() );
const sal_Int32 nHeight( aBmpSize.Height() );
ENSURE_OR_THROW( pReadAccess.get() != nullptr,
"::dxcanvas::tools::bitmapFromVCLBitmapEx(): "
"Unable to acquire read access to bitmap" );
Bitmap aAlpha( rBmpEx.GetAlpha().GetBitmap() );
Bitmap::ScopedReadAccess pAlphaReadAccess( aAlpha );
// By convention, the access buffer always has
// one of the following formats:
// ScanlineFormat::N1BitMsbPal
// ScanlineFormat::N8BitPal
// ScanlineFormat::N24BitTcBgr
// ScanlineFormat::N32BitTcMask
// and is always ScanlineFormat::BottomUp
// This is the way
// WinSalBitmap::AcquireBuffer() sets up the
// buffer
ENSURE_OR_THROW( pAlphaReadAccess.get() != nullptr,
"::dxcanvas::tools::bitmapFromVCLBitmapEx(): "
"Unable to acquire read access to alpha" );
ENSURE_OR_THROW( pAlphaReadAccess->GetScanlineFormat() == ScanlineFormat::N8BitPal,
"::dxcanvas::tools::bitmapFromVCLBitmapEx(): "
"Unsupported alpha scanline format" );
BitmapColor aCol;
sal_uInt8* pCurrOutput(aBmpData.maBitmapData.data());
int x, y;
for( y=0; y<nHeight; ++y )
{
switch( pReadAccess->GetScanlineFormat() )
{
case ScanlineFormat::N8BitPal:
{
Scanline pScan = pReadAccess->GetScanline( y );
Scanline pAScan = pAlphaReadAccess->GetScanline( y );
for( x=0; x<nWidth; ++x )
{
aCol = pReadAccess->GetPaletteColor( *pScan++ );
*pCurrOutput++ = aCol.GetBlue();
*pCurrOutput++ = aCol.GetGreen();
*pCurrOutput++ = aCol.GetRed();
// our notion of alpha is
// different from the rest
// of the world's
*pCurrOutput++ = 255 - static_cast<BYTE>(*pAScan++);
}
}
break;
case ScanlineFormat::N24BitTcBgr:
{
Scanline pScan = pReadAccess->GetScanline( y );
Scanline pAScan = pAlphaReadAccess->GetScanline( y );
for( x=0; x<nWidth; ++x )
{
// store as RGBA
*pCurrOutput++ = *pScan++;
*pCurrOutput++ = *pScan++;
*pCurrOutput++ = *pScan++;
// our notion of alpha is
// different from the rest
// of the world's
*pCurrOutput++ = 255 - static_cast<BYTE>(*pAScan++);
}
}
break;
// TODO(P2): Might be advantageous
// to hand-formulate the following
// formats, too.
case ScanlineFormat::N1BitMsbPal:
case ScanlineFormat::N32BitTcMask:
{
Scanline pAScan = pAlphaReadAccess->GetScanline( y );
// using fallback for those
// seldom formats
for( x=0; x<nWidth; ++x )
{
// yes. x and y are swapped on Get/SetPixel
aCol = pReadAccess->GetColor(y,x);
*pCurrOutput++ = aCol.GetBlue();
*pCurrOutput++ = aCol.GetGreen();
*pCurrOutput++ = aCol.GetRed();
// our notion of alpha is
// different from the rest
// of the world's
*pCurrOutput++ = 255 - static_cast<BYTE>(*pAScan++);
}
}
break;
case ScanlineFormat::N1BitLsbPal:
case ScanlineFormat::N24BitTcRgb:
case ScanlineFormat::N32BitTcAbgr:
case ScanlineFormat::N32BitTcArgb:
case ScanlineFormat::N32BitTcBgra:
case ScanlineFormat::N32BitTcRgba:
default:
ENSURE_OR_THROW( false,
"::dxcanvas::tools::bitmapFromVCLBitmapEx(): "
"Unexpected scanline format - has "
"WinSalBitmap::AcquireBuffer() changed?" );
}
}
return aBmpData;
}
bool drawVCLBitmapEx( const std::shared_ptr< Gdiplus::Graphics >& rGraphics,
const ::BitmapEx& rBmpEx )
{
if( !rBmpEx.IsAlpha() )
{
Bitmap aBmp( rBmpEx.GetBitmap() );
return drawVCLBitmap( rGraphics, aBmp );
}
else
{
return drawRGBABits( rGraphics,
bitmapFromVCLBitmapEx( rBmpEx ) );
}
}
}
bool drawVCLBitmapFromXBitmap( const std::shared_ptr< Gdiplus::Graphics >& rGraphics,
const uno::Reference< rendering::XBitmap >& xBitmap )
{
// TODO(F2): add support for floating point bitmap formats
uno::Reference< rendering::XIntegerReadOnlyBitmap > xIntBmp(
xBitmap, uno::UNO_QUERY );
if( !xIntBmp.is() )
return false;
::BitmapEx aBmpEx = vcl::unotools::bitmapExFromXBitmap( xIntBmp );
if( aBmpEx.IsEmpty() )
return false;
return drawVCLBitmapEx( rGraphics, aBmpEx );
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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