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libreoffice/xmloff/source/style/TransGradientStyle.cxx
Regina Henschel 8aa623714f MCGR: Use tryToRecreateBorder too for transparency 
This is similar to 'Use tryToRecreateBorder for better BW comp with LO'
(see commit 8259a99f41), but now for
transparency gradients.

Change-Id: I1c2e11562fa998c364896d517f4ed3bfe92f6c15
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/152508
Tested-by: Jenkins
Reviewed-by: Regina Henschel <rb.henschel@t-online.de>
2023-06-02 12:35:24 +02:00

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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 <TransGradientStyle.hxx>
#include <com/sun/star/awt/Gradient2.hpp>
#include <basegfx/utils/bgradient.hxx>
#include <comphelper/documentconstants.hxx>
#include <rtl/ustrbuf.hxx>
#include <rtl/ustring.hxx>
#include <sal/log.hxx>
#include <sax/tools/converter.hxx>
#include <tools/color.hxx>
#include <xmloff/namespacemap.hxx>
#include <xmloff/xmlement.hxx>
#include <xmloff/xmlexp.hxx>
#include <xmloff/xmlimp.hxx>
#include <xmloff/xmlnamespace.hxx>
#include <xmloff/xmltkmap.hxx>
#include <xmloff/xmluconv.hxx>
using namespace ::com::sun::star;
using namespace ::xmloff::token;
SvXMLEnumMapEntry<awt::GradientStyle> const pXML_GradientStyle_Enum[] =
{
{ XML_LINEAR, awt::GradientStyle_LINEAR },
{ XML_GRADIENTSTYLE_AXIAL, awt::GradientStyle_AXIAL },
{ XML_GRADIENTSTYLE_RADIAL, awt::GradientStyle_RADIAL },
{ XML_GRADIENTSTYLE_ELLIPSOID, awt::GradientStyle_ELLIPTICAL },
{ XML_GRADIENTSTYLE_SQUARE, awt::GradientStyle_SQUARE },
{ XML_GRADIENTSTYLE_RECTANGULAR, awt::GradientStyle_RECT },
{ XML_TOKEN_INVALID, awt::GradientStyle(0) }
};
// Import
XMLTransGradientStyleImport::XMLTransGradientStyleImport( SvXMLImport& rImp )
: rImport(rImp)
{
}
void XMLTransGradientStyleImport::importXML(
const uno::Reference< xml::sax::XFastAttributeList >& xAttrList,
uno::Any& rValue,
OUString& rStrName )
{
OUString aDisplayName;
awt::Gradient2 aGradient;
aGradient.XOffset = 0;
aGradient.YOffset = 0;
aGradient.StartIntensity = 100;
aGradient.EndIntensity = 100;
aGradient.Angle = 0;
aGradient.Border = 0;
for (auto &aIter : sax_fastparser::castToFastAttributeList( xAttrList ))
{
sal_Int32 nTmpValue;
switch( aIter.getToken() )
{
case XML_ELEMENT(DRAW, XML_NAME):
{
rStrName = aIter.toString();
}
break;
case XML_ELEMENT(DRAW, XML_DISPLAY_NAME):
{
aDisplayName = aIter.toString();
}
break;
case XML_ELEMENT(DRAW, XML_STYLE):
{
SvXMLUnitConverter::convertEnum( aGradient.Style, aIter.toView(), pXML_GradientStyle_Enum );
}
break;
case XML_ELEMENT(DRAW, XML_CX):
::sax::Converter::convertPercent( nTmpValue, aIter.toView() );
aGradient.XOffset = sal::static_int_cast< sal_Int16 >(nTmpValue);
break;
case XML_ELEMENT(DRAW, XML_CY):
::sax::Converter::convertPercent( nTmpValue, aIter.toView() );
aGradient.YOffset = sal::static_int_cast< sal_Int16 >(nTmpValue);
break;
case XML_ELEMENT(DRAW, XML_START):
{
sal_Int32 aStartTransparency;
::sax::Converter::convertPercent( aStartTransparency, aIter.toView() );
sal_uInt8 n = sal::static_int_cast< sal_uInt8 >(
( (100 - aStartTransparency) * 255 ) / 100 );
Color aColor( n, n, n );
aGradient.StartColor = static_cast<sal_Int32>( aColor );
}
break;
case XML_ELEMENT(DRAW, XML_END):
{
sal_Int32 aEndTransparency;
::sax::Converter::convertPercent( aEndTransparency, aIter.toView() );
sal_uInt8 n = sal::static_int_cast< sal_uInt8 >(
( (100 - aEndTransparency) * 255 ) / 100 );
Color aColor( n, n, n );
aGradient.EndColor = static_cast<sal_Int32>( aColor );
}
break;
case XML_ELEMENT(DRAW, XML_GRADIENT_ANGLE):
{
auto const cmp12(rImport.GetODFVersion().compareTo(ODFVER_012_TEXT));
bool const bSuccess =
::sax::Converter::convertAngle(aGradient.Angle, aIter.toView(),
// tdf#89475 try to detect borked OOo angles
(cmp12 < 0) || (cmp12 == 0
&& (rImport.isGeneratorVersionOlderThan(SvXMLImport::AOO_4x, SvXMLImport::LO_7x)
// also for AOO 4.x, assume there won't ever be a 4.2
|| rImport.getGeneratorVersion() == SvXMLImport::AOO_4x)));
SAL_INFO_IF(!bSuccess, "xmloff.style", "failed to import draw:angle");
}
break;
case XML_ELEMENT(DRAW, XML_BORDER):
::sax::Converter::convertPercent( nTmpValue, aIter.toView() );
aGradient.Border = sal::static_int_cast< sal_Int16 >(nTmpValue);
break;
default:
XMLOFF_WARN_UNKNOWN("xmloff.style", aIter);
}
}
rValue <<= aGradient;
if( !aDisplayName.isEmpty() )
{
rImport.AddStyleDisplayName( XmlStyleFamily::SD_GRADIENT_ID, rStrName,
aDisplayName );
rStrName = aDisplayName;
}
}
// Export
XMLTransGradientStyleExport::XMLTransGradientStyleExport( SvXMLExport& rExp )
: rExport(rExp)
{
}
void XMLTransGradientStyleExport::exportXML(
const OUString& rStrName,
const uno::Any& rValue )
{
// MCGR: We try to write the gradient so, that applications without multi-color gradient support
// can render it as best as possible.
// This is similar to XMLGradientStyleExport::exportXML(). For details see there.
if( rStrName.isEmpty() )
return;
if (!rValue.has<css::awt::Gradient2>() && !rValue.has<css::awt::Gradient>())
return;
basegfx::BGradient aGradient(rValue);
// ToDo: aGradient.tryToConvertToAxial();
aGradient.tryToRecreateBorder(nullptr);
OUString aStrValue;
OUStringBuffer aOut;
// Style
if (!SvXMLUnitConverter::convertEnum(aOut, aGradient.GetGradientStyle(),
pXML_GradientStyle_Enum))
return;
// Name
bool bEncoded = false;
rExport.AddAttribute( XML_NAMESPACE_DRAW, XML_NAME,
rExport.EncodeStyleName( rStrName,
&bEncoded ) );
if( bEncoded )
rExport.AddAttribute( XML_NAMESPACE_DRAW, XML_DISPLAY_NAME,
rStrName );
aStrValue = aOut.makeStringAndClear();
rExport.AddAttribute( XML_NAMESPACE_DRAW, XML_STYLE, aStrValue );
// Center x/y
if (awt::GradientStyle_LINEAR != aGradient.GetGradientStyle()
&& awt::GradientStyle_AXIAL != aGradient.GetGradientStyle())
{
::sax::Converter::convertPercent(aOut, aGradient.GetXOffset());
aStrValue = aOut.makeStringAndClear();
rExport.AddAttribute( XML_NAMESPACE_DRAW, XML_CX, aStrValue );
::sax::Converter::convertPercent(aOut, aGradient.GetYOffset());
aStrValue = aOut.makeStringAndClear();
rExport.AddAttribute( XML_NAMESPACE_DRAW, XML_CY, aStrValue );
}
// LO uses a gray color as transparency. ODF uses opacity in range [0%,100%].
// Default 100% opacity.
double fOpacityStartPerc = 100.0;
double fOpacityEndPerc = 100.0;
if (!aGradient.GetColorStops().empty())
{
fOpacityStartPerc
= (1.0 - aGradient.GetColorStops().front().getStopColor().getRed()) * 100.0;
fOpacityEndPerc = (1.0 - aGradient.GetColorStops().back().getStopColor().getRed()) * 100.0;
}
// Opacity start
::sax::Converter::convertPercent(aOut, static_cast<sal_Int32>(std::lround(fOpacityStartPerc)));
aStrValue = aOut.makeStringAndClear();
rExport.AddAttribute( XML_NAMESPACE_DRAW, XML_START, aStrValue );
// Opacity end
::sax::Converter::convertPercent( aOut, static_cast<sal_Int32>(std::lround(fOpacityEndPerc)));
aStrValue = aOut.makeStringAndClear();
rExport.AddAttribute( XML_NAMESPACE_DRAW, XML_END, aStrValue );
// Angle
if (awt::GradientStyle_RADIAL != aGradient.GetGradientStyle())
{
::sax::Converter::convertAngle(aOut, aGradient.GetAngle().get(),
rExport.getSaneDefaultVersion());
aStrValue = aOut.makeStringAndClear();
rExport.AddAttribute( XML_NAMESPACE_DRAW, XML_GRADIENT_ANGLE, aStrValue );
}
// Border
::sax::Converter::convertPercent(aOut, aGradient.GetBorder());
aStrValue = aOut.makeStringAndClear();
rExport.AddAttribute( XML_NAMESPACE_DRAW, XML_BORDER, aStrValue );
// ctor writes start tag. End-tag is written by destructor at block end.
SvXMLElementExport rElem(rExport, XML_NAMESPACE_DRAW, XML_OPACITY, true, false);
// Write child elements <loext:opacity-stop>
// Do not export in standard ODF 1.3 or older.
if ((rExport.getSaneDefaultVersion() & SvtSaveOptions::ODFSVER_EXTENDED) == 0)
return;
if (aGradient.GetColorStops().empty())
return;
double fPreviousOffset = 0.0;
for (auto& aCandidate : aGradient.GetColorStops())
{
// Attribute svg:offset. Make sure offsets are increasing.
double fOffset = std::clamp<double>(aCandidate.getStopOffset(), 0.0, 1.0);
if (fOffset < fPreviousOffset)
fOffset = fPreviousOffset;
rExport.AddAttribute(XML_NAMESPACE_SVG, XML_OFFSET, OUString::number(fOffset));
fPreviousOffset = fOffset;
// Attribute svg:stop-opacity, data type zeroToOneDecimal
double fOpacity = std::clamp<double>(1.0 - aCandidate.getStopColor().getRed(), 0.0, 1.0);
rExport.AddAttribute(XML_NAMESPACE_SVG, XML_STOP_OPACITY, OUString::number(fOpacity));
// write opacity stop element
SvXMLElementExport aStopElement(rExport, XML_NAMESPACE_LO_EXT, XML_OPACITY_STOP, true, true);
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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