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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 <sal/config.h>
#include <com/sun/star/rendering/TextDirection.hpp>
#include <rtl/math.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <tools/diagnose_ex.h>
#include <vcl/canvastools.hxx>
#include <vcl/metric.hxx>
#include <vcl/virdev.hxx>
#include <canvas/canvastools.hxx>
#include <verifyinput.hxx>
#include <cairo.h>
#include "cairo_canvasfont.hxx"
#include "cairo_canvashelper.hxx"
#include "cairo_textlayout.hxx"
using namespace ::cairo;
using namespace ::com::sun::star;
namespace cairocanvas
{
uno::Reference< rendering::XCanvasFont > CanvasHelper::createFont( const rendering::XCanvas* ,
const rendering::FontRequest& fontRequest,
const uno::Sequence< beans::PropertyValue >& extraFontProperties,
const geometry::Matrix2D& fontMatrix )
{
return uno::Reference< rendering::XCanvasFont >( new CanvasFont( fontRequest, extraFontProperties, fontMatrix, mpSurfaceProvider ));
}
uno::Sequence< rendering::FontInfo > CanvasHelper::queryAvailableFonts( const rendering::XCanvas* ,
const rendering::FontInfo& /*aFilter*/,
const uno::Sequence< beans::PropertyValue >& /*aFontProperties*/ )
{
// TODO
return uno::Sequence< rendering::FontInfo >();
}
static bool
setupFontTransform( ::OutputDevice const & rOutDev,
::Point& o_rPoint,
vcl::Font& io_rVCLFont,
const rendering::ViewState& rViewState,
const rendering::RenderState& rRenderState )
{
::basegfx::B2DHomMatrix aMatrix;
::canvas::tools::mergeViewAndRenderTransform(aMatrix,
rViewState,
rRenderState);
::basegfx::B2DTuple aScale;
::basegfx::B2DTuple aTranslate;
double nRotate, nShearX;
aMatrix.decompose( aScale, aTranslate, nRotate, nShearX );
// query font metric _before_ tampering with width and height
if( !::rtl::math::approxEqual(aScale.getX(), aScale.getY()) )
{
// retrieve true font width
const sal_Int32 nFontWidth( rOutDev.GetFontMetric( io_rVCLFont ).GetAverageFontWidth() );
const sal_Int32 nScaledFontWidth( ::basegfx::fround(nFontWidth * aScale.getX()) );
if( !nScaledFontWidth )
{
// scale is smaller than one pixel - disable text
// output altogether
return false;
}
io_rVCLFont.SetAverageFontWidth( nScaledFontWidth );
}
if( !::rtl::math::approxEqual(aScale.getY(), 1.0) )
{
const sal_Int32 nFontHeight( io_rVCLFont.GetFontHeight() );
io_rVCLFont.SetFontHeight( ::basegfx::fround(nFontHeight * aScale.getY()) );
}
io_rVCLFont.SetOrientation( static_cast< short >( ::basegfx::fround(-fmod(nRotate, 2*M_PI)*(1800.0/M_PI)) ) );
// TODO(F2): Missing functionality in VCL: shearing
o_rPoint.setX( ::basegfx::fround(aTranslate.getX()) );
o_rPoint.setY( ::basegfx::fround(aTranslate.getY()) );
return true;
}
static int
setupOutDevState( OutputDevice& rOutDev,
const rendering::XCanvas* pOwner,
const rendering::ViewState& viewState,
const rendering::RenderState& renderState )
{
::canvas::tools::verifyInput( renderState,
OSL_THIS_FUNC,
const_cast<rendering::XCanvas*>(pOwner), // only for refcount
2,
3 /* text */ );
int nTransparency(0);
// TODO(P2): Don't change clipping all the time, maintain current clip
// state and change only when update is necessary
::canvas::tools::clipOutDev(viewState, renderState, rOutDev);
Color aColor( COL_WHITE );
if( renderState.DeviceColor.getLength() > 2 )
{
aColor = vcl::unotools::stdColorSpaceSequenceToColor( renderState.DeviceColor );
}
// extract alpha, and make color opaque
// afterwards. Otherwise, OutputDevice won't draw anything
nTransparency = aColor.GetTransparency();
aColor.SetTransparency(0);
rOutDev.SetTextColor( aColor );
return nTransparency;
}
namespace {
class DeviceSettingsGuard
{
private:
VclPtr<OutputDevice> mpVirtualDevice;
bool mbMappingWasEnabled;
public:
DeviceSettingsGuard(OutputDevice *pVirtualDevice)
: mpVirtualDevice(pVirtualDevice)
, mbMappingWasEnabled(mpVirtualDevice->IsMapModeEnabled())
{
mpVirtualDevice->Push();
mpVirtualDevice->EnableMapMode(false);
}
~DeviceSettingsGuard()
{
mpVirtualDevice->EnableMapMode(mbMappingWasEnabled);
mpVirtualDevice->Pop();
}
};
}
static bool setupTextOutput( OutputDevice& rOutDev,
const rendering::XCanvas* pOwner,
::Point& o_rOutPos,
const rendering::ViewState& viewState,
const rendering::RenderState& renderState,
const uno::Reference< rendering::XCanvasFont >& xFont )
{
setupOutDevState( rOutDev, pOwner, viewState, renderState );
CanvasFont* pFont = dynamic_cast< CanvasFont* >( xFont.get() );
ENSURE_ARG_OR_THROW( pFont,
"CanvasHelper::setupTextOutput(): Font not compatible with this canvas" );
vcl::Font aVCLFont = pFont->getVCLFont();
Color aColor( COL_BLACK );
if( renderState.DeviceColor.getLength() > 2 )
{
aColor = vcl::unotools::stdColorSpaceSequenceToColor(renderState.DeviceColor );
}
// setup font color
aVCLFont.SetColor( aColor );
aVCLFont.SetFillColor( aColor );
// no need to replicate this for mp2ndOutDev, we're modifying only aVCLFont here.
if( !setupFontTransform( rOutDev, o_rOutPos, aVCLFont, viewState, renderState ) )
return false;
rOutDev.SetFont( aVCLFont );
return true;
}
uno::Reference< rendering::XCachedPrimitive > CanvasHelper::drawText( const rendering::XCanvas* pOwner,
const rendering::StringContext& text,
const uno::Reference< rendering::XCanvasFont >& xFont,
const rendering::ViewState& viewState,
const rendering::RenderState& renderState,
sal_Int8 textDirection )
{
#ifdef CAIRO_CANVAS_PERF_TRACE
struct timespec aTimer;
mxDevice->startPerfTrace( &aTimer );
#endif
ENSURE_ARG_OR_THROW( xFont.is(),
"CanvasHelper::drawText(): font is NULL");
if( !mpVirtualDevice )
mpVirtualDevice = mpSurface->createVirtualDevice();
if( mpVirtualDevice )
{
DeviceSettingsGuard aGuard(mpVirtualDevice.get());
::Point aOutpos;
if( !setupTextOutput( *mpVirtualDevice, pOwner, aOutpos, viewState, renderState, xFont ) )
return uno::Reference< rendering::XCachedPrimitive >(nullptr); // no output necessary
// change text direction and layout mode
ComplexTextLayoutFlags nLayoutMode(ComplexTextLayoutFlags::Default);
switch( textDirection )
{
case rendering::TextDirection::WEAK_LEFT_TO_RIGHT:
case rendering::TextDirection::STRONG_LEFT_TO_RIGHT:
nLayoutMode |= ComplexTextLayoutFlags::BiDiStrong;
nLayoutMode |= ComplexTextLayoutFlags::TextOriginLeft;
break;
case rendering::TextDirection::WEAK_RIGHT_TO_LEFT:
nLayoutMode |= ComplexTextLayoutFlags::BiDiRtl;
[[fallthrough]];
case rendering::TextDirection::STRONG_RIGHT_TO_LEFT:
nLayoutMode |= ComplexTextLayoutFlags::BiDiRtl | ComplexTextLayoutFlags::BiDiStrong;
nLayoutMode |= ComplexTextLayoutFlags::TextOriginRight;
break;
}
// TODO(F2): alpha
mpVirtualDevice->SetLayoutMode( nLayoutMode );
rtl::Reference pTextLayout( new TextLayout(text, textDirection, 0, CanvasFont::Reference(dynamic_cast< CanvasFont* >( xFont.get() )), mpSurfaceProvider) );
pTextLayout->draw(mpCairo, *mpVirtualDevice, aOutpos, viewState, renderState);
}
return uno::Reference< rendering::XCachedPrimitive >(nullptr);
}
uno::Reference< rendering::XCachedPrimitive > CanvasHelper::drawTextLayout( const rendering::XCanvas* pOwner,
const uno::Reference< rendering::XTextLayout >& xLayoutedText,
const rendering::ViewState& viewState,
const rendering::RenderState& renderState )
{
ENSURE_ARG_OR_THROW( xLayoutedText.is(),
"CanvasHelper::drawTextLayout(): layout is NULL");
TextLayout* pTextLayout = dynamic_cast< TextLayout* >( xLayoutedText.get() );
if( pTextLayout )
{
if( !mpVirtualDevice )
mpVirtualDevice = mpSurface->createVirtualDevice();
if( mpVirtualDevice )
{
DeviceSettingsGuard aGuard(mpVirtualDevice.get());
// TODO(T3): Race condition. We're taking the font
// from xLayoutedText, and then calling draw() at it,
// without exclusive access. Move setupTextOutput(),
// e.g. to impltools?
::Point aOutpos;
if( !setupTextOutput( *mpVirtualDevice, pOwner, aOutpos, viewState, renderState, xLayoutedText->getFont() ) )
return uno::Reference< rendering::XCachedPrimitive >(nullptr); // no output necessary
// TODO(F2): What about the offset scalings?
pTextLayout->draw(mpCairo, *mpVirtualDevice, aOutpos, viewState, renderState);
}
}
else
{
ENSURE_ARG_OR_THROW( false,
"CanvasHelper::drawTextLayout(): TextLayout not compatible with this canvas" );
}
return uno::Reference< rendering::XCachedPrimitive >(nullptr);
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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