6d1b241ab7
Change-Id: Ic21ff7bf48f07f7277979d52e99d2c5c268de83f Reviewed-on: https://gerrit.libreoffice.org/c/core/+/157825 Tested-by: Jenkins Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
363 lines
13 KiB
C++
363 lines
13 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <sal/config.h>
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#include <sal/log.hxx>
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#include <math.h>
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#include <com/sun/star/rendering/TextDirection.hpp>
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#include <canvas/canvastools.hxx>
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#include <basegfx/matrix/b2dhommatrix.hxx>
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#include <basegfx/numeric/ftools.hxx>
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#include <cppuhelper/supportsservice.hxx>
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#include <comphelper/diagnose_ex.hxx>
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#include <utility>
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#include <vcl/kernarray.hxx>
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#include <vcl/metric.hxx>
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#include <vcl/virdev.hxx>
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#include "cairo_textlayout.hxx"
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using namespace ::cairo;
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using namespace ::com::sun::star;
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namespace cairocanvas
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{
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namespace
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{
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void setupLayoutMode( OutputDevice& rOutDev,
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sal_Int8 nTextDirection )
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{
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// TODO(P3): avoid if already correctly set
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vcl::text::ComplexTextLayoutFlags nLayoutMode = vcl::text::ComplexTextLayoutFlags::Default;
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switch( nTextDirection )
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{
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case rendering::TextDirection::WEAK_LEFT_TO_RIGHT:
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break;
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case rendering::TextDirection::STRONG_LEFT_TO_RIGHT:
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nLayoutMode = vcl::text::ComplexTextLayoutFlags::BiDiStrong;
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break;
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case rendering::TextDirection::WEAK_RIGHT_TO_LEFT:
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nLayoutMode = vcl::text::ComplexTextLayoutFlags::BiDiRtl;
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break;
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case rendering::TextDirection::STRONG_RIGHT_TO_LEFT:
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nLayoutMode = vcl::text::ComplexTextLayoutFlags::BiDiRtl | vcl::text::ComplexTextLayoutFlags::BiDiStrong;
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break;
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default:
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break;
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}
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// set calculated layout mode. Origin is always the left edge,
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// as required at the API spec
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rOutDev.SetLayoutMode( nLayoutMode | vcl::text::ComplexTextLayoutFlags::TextOriginLeft );
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}
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}
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TextLayout::TextLayout( rendering::StringContext aText,
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sal_Int8 nDirection,
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sal_Int64 /*nRandomSeed*/,
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CanvasFont::Reference rFont,
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SurfaceProviderRef rRefDevice ) :
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maText(std::move( aText )),
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mpFont(std::move( rFont )),
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mpRefDevice(std::move( rRefDevice )),
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mnTextDirection( nDirection )
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{
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}
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TextLayout::~TextLayout()
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{
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}
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void TextLayout::disposing(std::unique_lock<std::mutex>& /*rGuard*/)
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{
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mpFont.clear();
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mpRefDevice.clear();
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}
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// XTextLayout
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uno::Sequence< uno::Reference< rendering::XPolyPolygon2D > > SAL_CALL TextLayout::queryTextShapes( )
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{
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// TODO
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return uno::Sequence< uno::Reference< rendering::XPolyPolygon2D > >();
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}
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uno::Sequence< geometry::RealRectangle2D > SAL_CALL TextLayout::queryInkMeasures( )
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{
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// TODO
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return uno::Sequence< geometry::RealRectangle2D >();
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}
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uno::Sequence< geometry::RealRectangle2D > SAL_CALL TextLayout::queryMeasures( )
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{
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// TODO
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return uno::Sequence< geometry::RealRectangle2D >();
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}
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uno::Sequence< double > SAL_CALL TextLayout::queryLogicalAdvancements( )
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{
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std::unique_lock aGuard( m_aMutex );
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return maLogicalAdvancements;
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}
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void SAL_CALL TextLayout::applyLogicalAdvancements( const uno::Sequence< double >& aAdvancements )
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{
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std::unique_lock aGuard( m_aMutex );
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if( aAdvancements.getLength() != maText.Length )
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{
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SAL_WARN("canvas.cairo", "TextLayout::applyLogicalAdvancements(): mismatching number of advancements" );
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throw lang::IllegalArgumentException("mismatching number of advancements", getXWeak(), 1);
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}
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maLogicalAdvancements = aAdvancements;
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}
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uno::Sequence< sal_Bool > SAL_CALL TextLayout::queryKashidaPositions( )
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{
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std::unique_lock aGuard( m_aMutex );
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return maKashidaPositions;
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}
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void SAL_CALL TextLayout::applyKashidaPositions( const uno::Sequence< sal_Bool >& aPositions )
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{
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std::unique_lock aGuard( m_aMutex );
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if( aPositions.hasElements() && aPositions.getLength() != maText.Length )
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{
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SAL_WARN("canvas.cairo", "TextLayout::applyKashidaPositions(): mismatching number of positions" );
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throw lang::IllegalArgumentException("mismatching number of positions", getXWeak(), 1);
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}
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maKashidaPositions = aPositions;
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}
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geometry::RealRectangle2D SAL_CALL TextLayout::queryTextBounds( )
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{
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std::unique_lock aGuard( m_aMutex );
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OutputDevice* pOutDev = mpRefDevice->getOutputDevice();
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if( !pOutDev )
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return geometry::RealRectangle2D();
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ScopedVclPtrInstance< VirtualDevice > pVDev( *pOutDev );
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pVDev->SetFont( mpFont->getVCLFont() );
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// need metrics for Y offset, the XCanvas always renders
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// relative to baseline
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const ::FontMetric& aMetric( pVDev->GetFontMetric() );
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setupLayoutMode( *pVDev, mnTextDirection );
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const sal_Int32 nAboveBaseline( -aMetric.GetAscent() );
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const sal_Int32 nBelowBaseline( aMetric.GetDescent() );
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if( maLogicalAdvancements.hasElements() )
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{
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return geometry::RealRectangle2D( 0, nAboveBaseline,
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maLogicalAdvancements[ maLogicalAdvancements.getLength()-1 ],
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nBelowBaseline );
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}
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else
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{
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return geometry::RealRectangle2D( 0, nAboveBaseline,
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pVDev->GetTextWidth(
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maText.Text,
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::canvas::tools::numeric_cast<sal_uInt16>(maText.StartPosition),
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::canvas::tools::numeric_cast<sal_uInt16>(maText.Length) ),
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nBelowBaseline );
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}
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}
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double SAL_CALL TextLayout::justify( double /*nSize*/ )
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{
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// TODO
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return 0.0;
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}
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double SAL_CALL TextLayout::combinedJustify( const uno::Sequence< uno::Reference< rendering::XTextLayout > >& /*aNextLayouts*/,
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double /*nSize*/ )
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{
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// TODO
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return 0.0;
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}
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rendering::TextHit SAL_CALL TextLayout::getTextHit( const geometry::RealPoint2D& /*aHitPoint*/ )
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{
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// TODO
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return rendering::TextHit();
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}
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rendering::Caret SAL_CALL TextLayout::getCaret( sal_Int32 /*nInsertionIndex*/,
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sal_Bool /*bExcludeLigatures*/ )
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{
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// TODO
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return rendering::Caret();
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}
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sal_Int32 SAL_CALL TextLayout::getNextInsertionIndex( sal_Int32 /*nStartIndex*/,
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sal_Int32 /*nCaretAdvancement*/,
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sal_Bool /*bExcludeLigatures*/ )
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{
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// TODO
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return 0;
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}
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uno::Reference< rendering::XPolyPolygon2D > SAL_CALL TextLayout::queryVisualHighlighting( sal_Int32 /*nStartIndex*/,
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sal_Int32 /*nEndIndex*/ )
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{
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// TODO
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return uno::Reference< rendering::XPolyPolygon2D >();
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}
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uno::Reference< rendering::XPolyPolygon2D > SAL_CALL TextLayout::queryLogicalHighlighting( sal_Int32 /*nStartIndex*/,
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sal_Int32 /*nEndIndex*/ )
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{
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// TODO
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return uno::Reference< rendering::XPolyPolygon2D >();
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}
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double SAL_CALL TextLayout::getBaselineOffset( )
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{
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// TODO
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return 0.0;
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}
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sal_Int8 SAL_CALL TextLayout::getMainTextDirection( )
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{
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return mnTextDirection;
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}
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uno::Reference< rendering::XCanvasFont > SAL_CALL TextLayout::getFont( )
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{
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std::unique_lock aGuard( m_aMutex );
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return mpFont;
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}
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rendering::StringContext SAL_CALL TextLayout::getText( )
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{
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return maText;
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}
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/**
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* TextLayout::draw
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*
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* Cairo-based text rendering. Draw text directly on the cairo surface with cairo fonts.
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* Avoid using VCL VirtualDevices for that, bypassing VCL DrawText functions, when possible
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*
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* Note: some text effects are not rendered due to lacking generic canvas or cairo canvas
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* implementation. See issues 92657, 92658, 92659, 92660, 97529
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**/
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void TextLayout::draw( OutputDevice& rOutDev,
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const Point& rOutpos,
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const rendering::ViewState& viewState,
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const rendering::RenderState& renderState ) const
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{
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std::unique_lock aGuard( m_aMutex );
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setupLayoutMode( rOutDev, mnTextDirection );
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if (maLogicalAdvancements.hasElements())
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{
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KernArray aOffsets(setupTextOffsets(maLogicalAdvancements, viewState, renderState));
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std::span<const sal_Bool> aKashidaArray(maKashidaPositions.getConstArray(), maKashidaPositions.getLength());
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rOutDev.DrawTextArray( rOutpos, maText.Text, aOffsets, aKashidaArray,
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::canvas::tools::numeric_cast<sal_uInt16>(maText.StartPosition),
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::canvas::tools::numeric_cast<sal_uInt16>(maText.Length) );
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}
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else
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{
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rOutDev.DrawText( rOutpos, maText.Text,
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::canvas::tools::numeric_cast<sal_uInt16>(maText.StartPosition),
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::canvas::tools::numeric_cast<sal_uInt16>(maText.Length) );
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}
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}
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namespace
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{
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class OffsetTransformer
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{
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public:
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explicit OffsetTransformer( ::basegfx::B2DHomMatrix aMat ) :
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maMatrix(std::move( aMat ))
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{
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}
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sal_Int32 operator()( const double& rOffset )
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{
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// This is an optimization of the normal rMat*[x,0]
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// transformation of the advancement vector (in x
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// direction), followed by a length calculation of the
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// resulting vector: advancement' =
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// ||rMat*[x,0]||. Since advancements are vectors, we
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// can ignore translational components, thus if [x,0],
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// it follows that rMat*[x,0]=[x',0] holds. Thus, we
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// just have to calc the transformation of the x
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// component.
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// TODO(F2): Handle non-horizontal advancements!
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return ::basegfx::fround( hypot(maMatrix.get(0,0)*rOffset,
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maMatrix.get(1,0)*rOffset) );
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}
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private:
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::basegfx::B2DHomMatrix maMatrix;
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};
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}
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KernArray TextLayout::setupTextOffsets(
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const uno::Sequence< double >& inputOffsets,
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const rendering::ViewState& viewState,
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const rendering::RenderState& renderState ) const
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{
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::basegfx::B2DHomMatrix aMatrix;
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::canvas::tools::mergeViewAndRenderTransform(aMatrix,
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viewState,
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renderState);
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// fill integer offsets
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KernArray outputOffsets;
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OffsetTransformer aTransform(aMatrix);
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std::for_each(inputOffsets.begin(), inputOffsets.end(),
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[&outputOffsets, &aTransform](double n) {outputOffsets.push_back(aTransform(n)); } );
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return outputOffsets;
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}
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OUString SAL_CALL TextLayout::getImplementationName()
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{
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return "CairoCanvas::TextLayout";
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}
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sal_Bool SAL_CALL TextLayout::supportsService( const OUString& ServiceName )
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{
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return cppu::supportsService( this, ServiceName );
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}
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uno::Sequence< OUString > SAL_CALL TextLayout::getSupportedServiceNames()
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{
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return { "com.sun.star.rendering.TextLayout" };
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}
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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