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364 | /* -*- 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 <sal/log.hxx>
#include <math.h>
#include <memory>
#include <com/sun/star/rendering/TextDirection.hpp>
#include <canvas/canvastools.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/numeric/ftools.hxx>
#include <cppuhelper/supportsservice.hxx>
#include <tools/diagnose_ex.h>
#include <vcl/metric.hxx>
#include <vcl/sysdata.hxx>
#include <vcl/virdev.hxx>
#include "cairo_textlayout.hxx"
#include <cairo.h>
#if defined CAIRO_HAS_FT_FONT
# include <cairo-ft.h>
#else
# error Native API needed.
#endif
using namespace ::cairo;
using namespace ::com::sun::star;
namespace cairocanvas
{
namespace
{
void setupLayoutMode( OutputDevice& rOutDev,
sal_Int8 nTextDirection )
{
// TODO(P3): avoid if already correctly set
ComplexTextLayoutFlags nLayoutMode = ComplexTextLayoutFlags::Default;
switch( nTextDirection )
{
case rendering::TextDirection::WEAK_LEFT_TO_RIGHT:
break;
case rendering::TextDirection::STRONG_LEFT_TO_RIGHT:
nLayoutMode = ComplexTextLayoutFlags::BiDiStrong;
break;
case rendering::TextDirection::WEAK_RIGHT_TO_LEFT:
nLayoutMode = ComplexTextLayoutFlags::BiDiRtl;
break;
case rendering::TextDirection::STRONG_RIGHT_TO_LEFT:
nLayoutMode = ComplexTextLayoutFlags::BiDiRtl | ComplexTextLayoutFlags::BiDiStrong;
break;
default:
break;
}
// set calculated layout mode. Origin is always the left edge,
// as required at the API spec
rOutDev.SetLayoutMode( nLayoutMode | ComplexTextLayoutFlags::TextOriginLeft );
}
}
TextLayout::TextLayout( const rendering::StringContext& aText,
sal_Int8 nDirection,
sal_Int64 /*nRandomSeed*/,
const CanvasFont::Reference& rFont,
const SurfaceProviderRef& rRefDevice ) :
TextLayout_Base( m_aMutex ),
maText( aText ),
maLogicalAdvancements(),
mpFont( rFont ),
mpRefDevice( rRefDevice ),
mnTextDirection( nDirection )
{
}
TextLayout::~TextLayout()
{
}
void SAL_CALL TextLayout::disposing()
{
::osl::MutexGuard aGuard( m_aMutex );
mpFont.clear();
mpRefDevice.clear();
}
// XTextLayout
uno::Sequence< uno::Reference< rendering::XPolyPolygon2D > > SAL_CALL TextLayout::queryTextShapes( )<--- The function 'queryTextShapes' is never used.
{
// TODO
return uno::Sequence< uno::Reference< rendering::XPolyPolygon2D > >();
}
uno::Sequence< geometry::RealRectangle2D > SAL_CALL TextLayout::queryInkMeasures( )
{
// TODO
return uno::Sequence< geometry::RealRectangle2D >();
}
uno::Sequence< geometry::RealRectangle2D > SAL_CALL TextLayout::queryMeasures( )<--- The function 'queryMeasures' is never used.
{
// TODO
return uno::Sequence< geometry::RealRectangle2D >();
}
uno::Sequence< double > SAL_CALL TextLayout::queryLogicalAdvancements( )
{
::osl::MutexGuard aGuard( m_aMutex );
return maLogicalAdvancements;
}
void SAL_CALL TextLayout::applyLogicalAdvancements( const uno::Sequence< double >& aAdvancements )
{
::osl::MutexGuard aGuard( m_aMutex );
if( aAdvancements.getLength() != maText.Length )
{
SAL_WARN("canvas.cairo", "TextLayout::applyLogicalAdvancements(): mismatching number of advancements" );
throw lang::IllegalArgumentException();
}
maLogicalAdvancements = aAdvancements;
}
geometry::RealRectangle2D SAL_CALL TextLayout::queryTextBounds( )
{
::osl::MutexGuard aGuard( m_aMutex );
OutputDevice* pOutDev = mpRefDevice->getOutputDevice();
if( !pOutDev )
return geometry::RealRectangle2D();
ScopedVclPtrInstance< VirtualDevice > pVDev( *pOutDev );
pVDev->SetFont( mpFont->getVCLFont() );
// need metrics for Y offset, the XCanvas always renders
// relative to baseline
const ::FontMetric& aMetric( pVDev->GetFontMetric() );
setupLayoutMode( *pVDev, mnTextDirection );
const sal_Int32 nAboveBaseline( -aMetric.GetAscent() );
const sal_Int32 nBelowBaseline( aMetric.GetDescent() );
if( maLogicalAdvancements.hasElements() )
{
return geometry::RealRectangle2D( 0, nAboveBaseline,
maLogicalAdvancements[ maLogicalAdvancements.getLength()-1 ],
nBelowBaseline );
}
else
{
return geometry::RealRectangle2D( 0, nAboveBaseline,
pVDev->GetTextWidth(
maText.Text,
::canvas::tools::numeric_cast<sal_uInt16>(maText.StartPosition),
::canvas::tools::numeric_cast<sal_uInt16>(maText.Length) ),
nBelowBaseline );
}
}
double SAL_CALL TextLayout::justify( double /*nSize*/ )<--- The function 'justify' is never used.
{
// TODO
return 0.0;
}
double SAL_CALL TextLayout::combinedJustify( const uno::Sequence< uno::Reference< rendering::XTextLayout > >& /*aNextLayouts*/,
double /*nSize*/ )
{
// TODO
return 0.0;
}
rendering::TextHit SAL_CALL TextLayout::getTextHit( const geometry::RealPoint2D& /*aHitPoint*/ )
{
// TODO
return rendering::TextHit();
}
rendering::Caret SAL_CALL TextLayout::getCaret( sal_Int32 /*nInsertionIndex*/,<--- The function 'getCaret' is never used.
sal_Bool /*bExcludeLigatures*/ )
{
// TODO
return rendering::Caret();
}
sal_Int32 SAL_CALL TextLayout::getNextInsertionIndex( sal_Int32 /*nStartIndex*/,<--- The function 'getNextInsertionIndex' is never used.
sal_Int32 /*nCaretAdvancement*/,
sal_Bool /*bExcludeLigatures*/ )
{
// TODO
return 0;
}
uno::Reference< rendering::XPolyPolygon2D > SAL_CALL TextLayout::queryVisualHighlighting( sal_Int32 /*nStartIndex*/,<--- The function 'queryVisualHighlighting' is never used.
sal_Int32 /*nEndIndex*/ )
{
// TODO
return uno::Reference< rendering::XPolyPolygon2D >();
}
uno::Reference< rendering::XPolyPolygon2D > SAL_CALL TextLayout::queryLogicalHighlighting( sal_Int32 /*nStartIndex*/,<--- The function 'queryLogicalHighlighting' is never used.
sal_Int32 /*nEndIndex*/ )
{
// TODO
return uno::Reference< rendering::XPolyPolygon2D >();
}
double SAL_CALL TextLayout::getBaselineOffset( )
{
// TODO
return 0.0;
}
sal_Int8 SAL_CALL TextLayout::getMainTextDirection( )
{
::osl::MutexGuard aGuard( m_aMutex );
return mnTextDirection;
}
uno::Reference< rendering::XCanvasFont > SAL_CALL TextLayout::getFont( )
{
::osl::MutexGuard aGuard( m_aMutex );
return mpFont.get();
}
rendering::StringContext SAL_CALL TextLayout::getText( )
{
::osl::MutexGuard aGuard( m_aMutex );
return maText;
}
/**
* TextLayout::draw
*
* Cairo-based text rendering. Draw text directly on the cairo surface with cairo fonts.
* Avoid using VCL VirtualDevices for that, bypassing VCL DrawText functions, when possible
*
* Note: some text effects are not rendered due to lacking generic canvas or cairo canvas
* implementation. See issues 92657, 92658, 92659, 92660, 97529
**/
void TextLayout::draw( OutputDevice& rOutDev,
const Point& rOutpos,
const rendering::ViewState& viewState,
const rendering::RenderState& renderState ) const
{
::osl::MutexGuard aGuard( m_aMutex );
setupLayoutMode( rOutDev, mnTextDirection );
std::unique_ptr< long []> aOffsets(new long[maLogicalAdvancements.getLength()]);
if( maLogicalAdvancements.hasElements() )
setupTextOffsets( aOffsets.get(), maLogicalAdvancements, viewState, renderState );
if (maLogicalAdvancements.hasElements())
{
rOutDev.DrawTextArray( rOutpos, maText.Text, aOffsets.get(),
::canvas::tools::numeric_cast<sal_uInt16>(maText.StartPosition),
::canvas::tools::numeric_cast<sal_uInt16>(maText.Length) );
}
else
{
rOutDev.DrawText( rOutpos, maText.Text,
::canvas::tools::numeric_cast<sal_uInt16>(maText.StartPosition),
::canvas::tools::numeric_cast<sal_uInt16>(maText.Length) );
}
}
namespace
{
class OffsetTransformer
{
public:
explicit OffsetTransformer( const ::basegfx::B2DHomMatrix& rMat ) :
maMatrix( rMat )
{
}
sal_Int32 operator()( const double& rOffset )
{
// This is an optimization of the normal rMat*[x,0]
// transformation of the advancement vector (in x
// direction), followed by a length calculation of the
// resulting vector: advancement' =
// ||rMat*[x,0]||. Since advancements are vectors, we
// can ignore translational components, thus if [x,0],
// it follows that rMat*[x,0]=[x',0] holds. Thus, we
// just have to calc the transformation of the x
// component.
// TODO(F2): Handle non-horizontal advancements!
return ::basegfx::fround( hypot(maMatrix.get(0,0)*rOffset,
maMatrix.get(1,0)*rOffset) );
}
private:
::basegfx::B2DHomMatrix maMatrix;
};
}
void TextLayout::setupTextOffsets( long* outputOffsets,
const uno::Sequence< double >& inputOffsets,
const rendering::ViewState& viewState,
const rendering::RenderState& renderState ) const
{
ENSURE_OR_THROW( outputOffsets!=nullptr,
"TextLayout::setupTextOffsets offsets NULL" );
::basegfx::B2DHomMatrix aMatrix;
::canvas::tools::mergeViewAndRenderTransform(aMatrix,
viewState,
renderState);
// fill integer offsets
std::transform( inputOffsets.begin(),
inputOffsets.end(),
outputOffsets,
OffsetTransformer( aMatrix ) );
}
OUString SAL_CALL TextLayout::getImplementationName()
{
return "CairoCanvas::TextLayout";
}
sal_Bool SAL_CALL TextLayout::supportsService( const OUString& ServiceName )
{
return cppu::supportsService( this, ServiceName );
}
uno::Sequence< OUString > SAL_CALL TextLayout::getSupportedServiceNames()
{
return { "com.sun.star.rendering.TextLayout" };
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|