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Diffstat (limited to 'canvas/source/cairo/cairo_textlayout.cxx')
| -rw-r--r-- | canvas/source/cairo/cairo_textlayout.cxx | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/canvas/source/cairo/cairo_textlayout.cxx b/canvas/source/cairo/cairo_textlayout.cxx new file mode 100644 index 000000000..cbbf02c56 --- /dev/null +++ b/canvas/source/cairo/cairo_textlayout.cxx @@ -0,0 +1,354 @@ +/* -*- 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 <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 <utility> +#include <vcl/metric.hxx> +#include <vcl/virdev.hxx> + + +#include "cairo_textlayout.hxx" + +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 + vcl::text::ComplexTextLayoutFlags nLayoutMode = vcl::text::ComplexTextLayoutFlags::Default; + switch( nTextDirection ) + { + case rendering::TextDirection::WEAK_LEFT_TO_RIGHT: + break; + case rendering::TextDirection::STRONG_LEFT_TO_RIGHT: + nLayoutMode = vcl::text::ComplexTextLayoutFlags::BiDiStrong; + break; + case rendering::TextDirection::WEAK_RIGHT_TO_LEFT: + nLayoutMode = vcl::text::ComplexTextLayoutFlags::BiDiRtl; + break; + case rendering::TextDirection::STRONG_RIGHT_TO_LEFT: + nLayoutMode = vcl::text::ComplexTextLayoutFlags::BiDiRtl | vcl::text::ComplexTextLayoutFlags::BiDiStrong; + break; + default: + break; + } + + // set calculated layout mode. Origin is always the left edge, + // as required at the API spec + rOutDev.SetLayoutMode( nLayoutMode | vcl::text::ComplexTextLayoutFlags::TextOriginLeft ); + } + } + + TextLayout::TextLayout( rendering::StringContext aText, + sal_Int8 nDirection, + sal_Int64 /*nRandomSeed*/, + CanvasFont::Reference rFont, + SurfaceProviderRef rRefDevice ) : + TextLayout_Base( m_aMutex ), + maText(std::move( aText )), + mpFont(std::move( rFont )), + mpRefDevice(std::move( 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( ) + { + // 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( ) + { + // 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("mismatching number of advancements", static_cast<cppu::OWeakObject*>(this), 1); + } + + 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*/ ) + { + // 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*/, + sal_Bool /*bExcludeLigatures*/ ) + { + // TODO + return rendering::Caret(); + } + + sal_Int32 SAL_CALL TextLayout::getNextInsertionIndex( sal_Int32 /*nStartIndex*/, + sal_Int32 /*nCaretAdvancement*/, + sal_Bool /*bExcludeLigatures*/ ) + { + // TODO + return 0; + } + + uno::Reference< rendering::XPolyPolygon2D > SAL_CALL TextLayout::queryVisualHighlighting( sal_Int32 /*nStartIndex*/, + sal_Int32 /*nEndIndex*/ ) + { + // TODO + return uno::Reference< rendering::XPolyPolygon2D >(); + } + + uno::Reference< rendering::XPolyPolygon2D > SAL_CALL TextLayout::queryLogicalHighlighting( sal_Int32 /*nStartIndex*/, + 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; + } + + 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::vector<sal_Int32> aOffsets(maLogicalAdvancements.getLength()); + + if( maLogicalAdvancements.hasElements() ) + setupTextOffsets( aOffsets.data(), maLogicalAdvancements, viewState, renderState ); + + if (maLogicalAdvancements.hasElements()) + { + rOutDev.DrawTextArray( rOutpos, maText.Text, aOffsets, + ::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( ::basegfx::B2DHomMatrix aMat ) : + maMatrix(std::move( aMat )) + { + } + + 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( sal_Int32* 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: */ |