office-gobmx/canvas/source/cairo/cairo_textlayout.cxx
Stephan Bergmann 6d1b241ab7 Drop o3tl::span, can use C++20 std::span directly now
Change-Id: Ic21ff7bf48f07f7277979d52e99d2c5c268de83f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/157825
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
2023-10-11 21:53:13 +02:00

363 lines
13 KiB
C++

/* -*- 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 <comphelper/diagnose_ex.hxx>
#include <utility>
#include <vcl/kernarray.hxx>
#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 ) :
maText(std::move( aText )),
mpFont(std::move( rFont )),
mpRefDevice(std::move( rRefDevice )),
mnTextDirection( nDirection )
{
}
TextLayout::~TextLayout()
{
}
void TextLayout::disposing(std::unique_lock<std::mutex>& /*rGuard*/)
{
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( )
{
std::unique_lock aGuard( m_aMutex );
return maLogicalAdvancements;
}
void SAL_CALL TextLayout::applyLogicalAdvancements( const uno::Sequence< double >& aAdvancements )
{
std::unique_lock 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", getXWeak(), 1);
}
maLogicalAdvancements = aAdvancements;
}
uno::Sequence< sal_Bool > SAL_CALL TextLayout::queryKashidaPositions( )
{
std::unique_lock aGuard( m_aMutex );
return maKashidaPositions;
}
void SAL_CALL TextLayout::applyKashidaPositions( const uno::Sequence< sal_Bool >& aPositions )
{
std::unique_lock aGuard( m_aMutex );
if( aPositions.hasElements() && aPositions.getLength() != maText.Length )
{
SAL_WARN("canvas.cairo", "TextLayout::applyKashidaPositions(): mismatching number of positions" );
throw lang::IllegalArgumentException("mismatching number of positions", getXWeak(), 1);
}
maKashidaPositions = aPositions;
}
geometry::RealRectangle2D SAL_CALL TextLayout::queryTextBounds( )
{
std::unique_lock 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( )
{
return mnTextDirection;
}
uno::Reference< rendering::XCanvasFont > SAL_CALL TextLayout::getFont( )
{
std::unique_lock aGuard( m_aMutex );
return mpFont;
}
rendering::StringContext SAL_CALL TextLayout::getText( )
{
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
{
std::unique_lock aGuard( m_aMutex );
setupLayoutMode( rOutDev, mnTextDirection );
if (maLogicalAdvancements.hasElements())
{
KernArray aOffsets(setupTextOffsets(maLogicalAdvancements, viewState, renderState));
std::span<const sal_Bool> aKashidaArray(maKashidaPositions.getConstArray(), maKashidaPositions.getLength());
rOutDev.DrawTextArray( rOutpos, maText.Text, aOffsets, aKashidaArray,
::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;
};
}
KernArray TextLayout::setupTextOffsets(
const uno::Sequence< double >& inputOffsets,
const rendering::ViewState& viewState,
const rendering::RenderState& renderState ) const
{
::basegfx::B2DHomMatrix aMatrix;
::canvas::tools::mergeViewAndRenderTransform(aMatrix,
viewState,
renderState);
// fill integer offsets
KernArray outputOffsets;
OffsetTransformer aTransform(aMatrix);
std::for_each(inputOffsets.begin(), inputOffsets.end(),
[&outputOffsets, &aTransform](double n) {outputOffsets.push_back(aTransform(n)); } );
return outputOffsets;
}
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: */