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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 "vcl/ctrl.hxx"
#include "vcl/outdev.hxx"
#include "outfont.hxx"
#include "textlayout.hxx"
#include <com/sun/star/i18n/ScriptDirection.hpp>
#include <tools/diagnose_ex.h>
#if OSL_DEBUG_LEVEL > 1
#include <rtl/strbuf.hxx>
#endif
#include <boost/scoped_array.hpp>
namespace vcl
{
using ::com::sun::star::uno::Reference;
using ::com::sun::star::uno::Exception;
namespace ScriptDirection = ::com::sun::star::i18n::ScriptDirection;
DefaultTextLayout::~DefaultTextLayout()
{
}
long DefaultTextLayout::GetTextWidth( const OUString& _rText, sal_Int32 _nStartIndex, sal_Int32 _nLength ) const
{
return m_rTargetDevice.GetTextWidth( _rText, _nStartIndex, _nLength );
}
void DefaultTextLayout::DrawText( const Point& _rStartPoint, const OUString& _rText, sal_Int32 _nStartIndex,
sal_Int32 _nLength, MetricVector* _pVector, OUString* _pDisplayText )
{
m_rTargetDevice.DrawText( _rStartPoint, _rText, _nStartIndex, _nLength, _pVector, _pDisplayText );
}
bool DefaultTextLayout::GetCaretPositions( const OUString& _rText, sal_Int32* _pCaretXArray,
sal_Int32 _nStartIndex, sal_Int32 _nLength ) const
{
return m_rTargetDevice.GetCaretPositions( _rText, _pCaretXArray, _nStartIndex, _nLength );
}
sal_Int32 DefaultTextLayout::GetTextBreak( const OUString& _rText, long _nMaxTextWidth, sal_Int32 _nStartIndex, sal_Int32 _nLength ) const
{
return m_rTargetDevice.GetTextBreak( _rText, _nMaxTextWidth, _nStartIndex, _nLength );
}
bool DefaultTextLayout::DecomposeTextRectAction() const
{
return false;
}
class ReferenceDeviceTextLayout : public ITextLayout
{
public:
ReferenceDeviceTextLayout( const Control& _rControl, OutputDevice& _rTargetDevice, OutputDevice& _rReferenceDevice );
virtual ~ReferenceDeviceTextLayout();
// ITextLayout
virtual long GetTextWidth( const OUString& rStr, sal_Int32 nIndex, sal_Int32 nLen ) const SAL_OVERRIDE;
virtual void DrawText( const Point& _rStartPoint, const OUString& _rText, sal_Int32 _nStartIndex, sal_Int32 _nLength, MetricVector* _pVector, OUString* _pDisplayText ) SAL_OVERRIDE;
virtual bool GetCaretPositions( const OUString& _rText, sal_Int32* _pCaretXArray, sal_Int32 _nStartIndex, sal_Int32 _nLength ) const SAL_OVERRIDE;
virtual sal_Int32 GetTextBreak(const OUString& _rText, long _nMaxTextWidth, sal_Int32 _nStartIndex, sal_Int32 _nLength) const SAL_OVERRIDE;
virtual bool DecomposeTextRectAction() const SAL_OVERRIDE;
public:
// equivalents to the respective OutputDevice methods, which take the reference device into account
long GetTextArray( const OUString& _rText, sal_Int32* _pDXAry, sal_Int32 _nStartIndex, sal_Int32 _nLength ) const;
Rectangle DrawText( const Rectangle& _rRect, const OUString& _rText, sal_uInt16 _nStyle, MetricVector* _pVector, OUString* _pDisplayText );
protected:
void onBeginDrawText()
{
m_aCompleteTextRect.SetEmpty();
}
Rectangle onEndDrawText()
{
return m_aCompleteTextRect;
}
private:
OutputDevice& m_rTargetDevice;
OutputDevice& m_rReferenceDevice;
Font m_aUnzoomedPointFont;
const Fraction m_aZoom;
const bool m_bRTLEnabled;
Rectangle m_aCompleteTextRect;
};
ReferenceDeviceTextLayout::ReferenceDeviceTextLayout( const Control& _rControl, OutputDevice& _rTargetDevice,
OutputDevice& _rReferenceDevice )
:m_rTargetDevice( _rTargetDevice )
,m_rReferenceDevice( _rReferenceDevice )
,m_aUnzoomedPointFont( _rControl.GetUnzoomedControlPointFont() )
,m_aZoom( _rControl.GetZoom() )
,m_bRTLEnabled( _rControl.IsRTLEnabled() )
{
m_rTargetDevice.Push( PUSH_MAPMODE | PUSH_FONT | PUSH_TEXTLAYOUTMODE );
MapMode aTargetMapMode( m_rTargetDevice.GetMapMode() );
OSL_ENSURE( aTargetMapMode.GetOrigin() == Point(), "ReferenceDeviceTextLayout::ReferenceDeviceTextLayout: uhm, the code below won't work here ..." );
// normally, controls simulate "zoom" by "zooming" the font. This is responsible for (part of) the discrepancies
// between text in Writer and text in controls in Writer, though both have the same font.
// So, if we have a zoom set at the control, then we do not scale the font, but instead modify the map mode
// to accommodate for the zoom.
aTargetMapMode.SetScaleX( m_aZoom ); // TODO: shouldn't this be "current_scale * zoom"?
aTargetMapMode.SetScaleY( m_aZoom );
// also, use a higher-resolution map unit than "pixels", which should save us some rounding errors when
// translating coordinates between the reference device and the target device.
OSL_ENSURE( aTargetMapMode.GetMapUnit() == MAP_PIXEL,
"ReferenceDeviceTextLayout::ReferenceDeviceTextLayout: this class is not expected to work with such target devices!" );
// we *could* adjust all the code in this class to handle this case, but at the moment, it's not necessary
const MapUnit eTargetMapUnit = m_rReferenceDevice.GetMapMode().GetMapUnit();
aTargetMapMode.SetMapUnit( eTargetMapUnit );
OSL_ENSURE( aTargetMapMode.GetMapUnit() != MAP_PIXEL,
"ReferenceDeviceTextLayout::ReferenceDeviceTextLayout: a reference device which has map mode PIXEL?!" );
m_rTargetDevice.SetMapMode( aTargetMapMode );
// now that the Zoom is part of the map mode, reset the target device's font to the "unzoomed" version
Font aDrawFont( m_aUnzoomedPointFont );
aDrawFont.SetSize( m_rTargetDevice.LogicToLogic( aDrawFont.GetSize(), MAP_POINT, eTargetMapUnit ) );
_rTargetDevice.SetFont( aDrawFont );
// transfer font to the reference device
m_rReferenceDevice.Push( PUSH_FONT | PUSH_TEXTLAYOUTMODE );
Font aRefFont( m_aUnzoomedPointFont );
aRefFont.SetSize( OutputDevice::LogicToLogic(
aRefFont.GetSize(), MAP_POINT, m_rReferenceDevice.GetMapMode().GetMapUnit() ) );
m_rReferenceDevice.SetFont( aRefFont );
}
ReferenceDeviceTextLayout::~ReferenceDeviceTextLayout()
{
m_rReferenceDevice.Pop();
m_rTargetDevice.Pop();
}
namespace
{
bool lcl_normalizeLength( const OUString& _rText, const sal_Int32 _nStartIndex, sal_Int32& _io_nLength )
{
sal_Int32 nTextLength = _rText.getLength();
if ( _nStartIndex > nTextLength )
return false;
if ( _nStartIndex + _io_nLength > nTextLength )
_io_nLength = nTextLength - _nStartIndex;
return true;
}
}
long ReferenceDeviceTextLayout::GetTextArray( const OUString& _rText, sal_Int32* _pDXAry, sal_Int32 _nStartIndex, sal_Int32 _nLength ) const
{
if ( !lcl_normalizeLength( _rText, _nStartIndex, _nLength ) )
return 0;
// retrieve the character widths from the reference device
long nTextWidth = m_rReferenceDevice.GetTextArray( _rText, _pDXAry, _nStartIndex, _nLength );
#if OSL_DEBUG_LEVEL > 1
if ( _pDXAry )
{
OStringBuffer aTrace;
aTrace.append( "ReferenceDeviceTextLayout::GetTextArray( " );
aTrace.append( OUStringToOString( _rText, RTL_TEXTENCODING_UTF8 ) );
aTrace.append( " ): " );
aTrace.append( nTextWidth );
aTrace.append( " = ( " );
for ( sal_Int32 i=0; i<_nLength; )
{
aTrace.append( _pDXAry[i] );
if ( ++i < _nLength )
aTrace.append( ", " );
}
aTrace.append( ")" );
OSL_TRACE( "%s", aTrace.makeStringAndClear().getStr() );
}
#endif
return nTextWidth;
}
long ReferenceDeviceTextLayout::GetTextWidth( const OUString& _rText, sal_Int32 _nStartIndex, sal_Int32 _nLength ) const
{
return GetTextArray( _rText, NULL, _nStartIndex, _nLength );
}
void ReferenceDeviceTextLayout::DrawText( const Point& _rStartPoint, const OUString& _rText, sal_Int32 _nStartIndex, sal_Int32 _nLength, MetricVector* _pVector, OUString* _pDisplayText )
{
if ( !lcl_normalizeLength( _rText, _nStartIndex, _nLength ) )
return;
if ( _pVector && _pDisplayText )
{
MetricVector aGlyphBounds;
m_rReferenceDevice.GetGlyphBoundRects( _rStartPoint, _rText, _nStartIndex, _nLength, _nStartIndex, aGlyphBounds );
::std::copy(
aGlyphBounds.begin(), aGlyphBounds.end(),
::std::insert_iterator< MetricVector > ( *_pVector, _pVector->end() ) );
*_pDisplayText += _rText.copy( _nStartIndex, _nLength );
return;
}
boost::scoped_array<sal_Int32> pCharWidths(new sal_Int32[ _nLength ]);
long nTextWidth = GetTextArray( _rText, pCharWidths.get(), _nStartIndex, _nLength );
m_rTargetDevice.DrawTextArray( _rStartPoint, _rText, pCharWidths.get(), _nStartIndex, _nLength );
pCharWidths.reset();
m_aCompleteTextRect.Union( Rectangle( _rStartPoint, Size( nTextWidth, m_rTargetDevice.GetTextHeight() ) ) );
}
bool ReferenceDeviceTextLayout::GetCaretPositions( const OUString& _rText, sal_Int32* _pCaretXArray,
sal_Int32 _nStartIndex, sal_Int32 _nLength ) const
{
if ( !lcl_normalizeLength( _rText, _nStartIndex, _nLength ) )
return false;
// retrieve the caret positions from the reference device
if ( !m_rReferenceDevice.GetCaretPositions( _rText, _pCaretXArray, _nStartIndex, _nLength ) )
return false;
return true;
}
sal_Int32 ReferenceDeviceTextLayout::GetTextBreak( const OUString& _rText, long _nMaxTextWidth, sal_Int32 _nStartIndex, sal_Int32 _nLength ) const
{
if ( !lcl_normalizeLength( _rText, _nStartIndex, _nLength ) )
return 0;
return m_rReferenceDevice.GetTextBreak( _rText, _nMaxTextWidth, _nStartIndex, _nLength );
}
bool ReferenceDeviceTextLayout::DecomposeTextRectAction() const
{
return true;
}
Rectangle ReferenceDeviceTextLayout::DrawText( const Rectangle& _rRect, const OUString& _rText, sal_uInt16 _nStyle, MetricVector* _pVector, OUString* _pDisplayText )
{
if ( _rText.isEmpty() )
return Rectangle();
// determine text layout mode from the RTL-ness of the control whose text we render
sal_uLong nTextLayoutMode = m_bRTLEnabled ? TEXT_LAYOUT_BIDI_RTL : TEXT_LAYOUT_BIDI_LTR;
m_rReferenceDevice.SetLayoutMode( nTextLayoutMode );
m_rTargetDevice.SetLayoutMode( nTextLayoutMode | TEXT_LAYOUT_TEXTORIGIN_LEFT );
// TEXT_LAYOUT_TEXTORIGIN_LEFT is because when we do actually draw the text (in DrawText( Point, ... )), then
// our caller gives us the left border of the draw position, regardless of script type, text layout,
// and the like in our ctor, we set the map mode of the target device from pixel to twip, but our caller doesn't know this,
// but passed pixel coordinates. So, adjust the rect.
Rectangle aRect( m_rTargetDevice.PixelToLogic( _rRect ) );
onBeginDrawText();
m_rTargetDevice.DrawText( aRect, _rText, _nStyle, _pVector, _pDisplayText, this );
Rectangle aTextRect = onEndDrawText();
if ( aTextRect.IsEmpty() && !aRect.IsEmpty() )
{
// this happens for instance if we're in a PaintToDevice call, where only a MetaFile is recorded,
// but no actual painting happens, so our "DrawText( Point, ... )" is never called
// In this case, calculate the rect from what OutputDevice::GetTextRect would give us. This has
// the disadvantage of less accuracy, compared with the approach to calculate the rect from the
// single "DrawText( Point, ... )" calls, since more intermediate arithmetics will translate
// from ref- to target-units.
aTextRect = m_rTargetDevice.GetTextRect( aRect, _rText, _nStyle, NULL, this );
}
// similar to above, the text rect now contains TWIPs (or whatever unit the ref device has), but the caller
// expects pixel coordinates
aTextRect = m_rTargetDevice.LogicToPixel( aTextRect );
// convert the metric vector
if ( _pVector )
{
for ( MetricVector::iterator charRect = _pVector->begin();
charRect != _pVector->end();
++charRect
)
{
*charRect = m_rTargetDevice.LogicToPixel( *charRect );
}
}
return aTextRect;
}
ControlTextRenderer::ControlTextRenderer( const Control& _rControl, OutputDevice& _rTargetDevice, OutputDevice& _rReferenceDevice )
:m_pImpl( new ReferenceDeviceTextLayout( _rControl, _rTargetDevice, _rReferenceDevice ) )
{
}
ControlTextRenderer::~ControlTextRenderer()
{
}
Rectangle ControlTextRenderer::DrawText( const Rectangle& _rRect, const OUString& _rText, sal_uInt16 _nStyle,
MetricVector* _pVector, OUString* _pDisplayText )
{
return m_pImpl->DrawText( _rRect, _rText, _nStyle, _pVector, _pDisplayText );
}
} // namespace vcl
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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