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Diffstat (limited to 'vcl/source/font/fontmetric.cxx')
| -rw-r--r-- | vcl/source/font/fontmetric.cxx | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/vcl/source/font/fontmetric.cxx b/vcl/source/font/fontmetric.cxx new file mode 100644 index 000000000..3b7a7ed09 --- /dev/null +++ b/vcl/source/font/fontmetric.cxx @@ -0,0 +1,394 @@ +/* -*- 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 <i18nlangtag/mslangid.hxx> +#include <officecfg/Office/Common.hxx> +#include <unotools/configmgr.hxx> +#include <vcl/metric.hxx> +#include <vcl/outdev.hxx> +#include <sal/log.hxx> + +#include <fontinstance.hxx> +#include <fontselect.hxx> +#include <impfontmetricdata.hxx> +#include <sft.hxx> + +#include <com/sun/star/uno/Sequence.hxx> +#include <comphelper/sequence.hxx> + +using namespace ::com::sun::star; +using namespace ::com::sun::star::uno; +using namespace ::rtl; +using namespace ::utl; + +FontMetric::FontMetric() +: mnAscent( 0 ), + mnDescent( 0 ), + mnIntLeading( 0 ), + mnExtLeading( 0 ), + mnLineHeight( 0 ), + mnSlant( 0 ), + mnBulletOffset( 0 ), + mbFullstopCentered( false ) +{} + +FontMetric::FontMetric( const FontMetric& rFontMetric ) = default; + +FontMetric::~FontMetric() +{ +} + +FontMetric& FontMetric::operator=(const FontMetric& rFontMetric) = default; + +FontMetric& FontMetric::operator=(FontMetric&& rFontMetric) = default; + +bool FontMetric::operator==( const FontMetric& r ) const +{ + if( Font::operator!=(r) ) + return false; + if (mbFullstopCentered != r.mbFullstopCentered) + return false; + if( mnAscent != r.mnAscent ) + return false; + if( mnDescent != r.mnDescent ) + return false; + if( mnIntLeading != r.mnIntLeading ) + return false; + if( mnExtLeading != r.mnExtLeading ) + return false; + if( mnSlant != r.mnSlant ) + return false; + + return true; +} + +ImplFontMetricData::ImplFontMetricData( const FontSelectPattern& rFontSelData ) + : FontAttributes( rFontSelData ) + , mnHeight ( rFontSelData.mnHeight ) + , mnWidth ( rFontSelData.mnWidth ) + , mnOrientation( static_cast<short>(rFontSelData.mnOrientation) ) + , mnAscent( 0 ) + , mnDescent( 0 ) + , mnIntLeading( 0 ) + , mnExtLeading( 0 ) + , mnSlant( 0 ) + , mnMinKashida( 0 ) + , mbFullstopCentered( false ) + , mnBulletOffset( 0 ) + , mnUnderlineSize( 0 ) + , mnUnderlineOffset( 0 ) + , mnBUnderlineSize( 0 ) + , mnBUnderlineOffset( 0 ) + , mnDUnderlineSize( 0 ) + , mnDUnderlineOffset1( 0 ) + , mnDUnderlineOffset2( 0 ) + , mnWUnderlineSize( 0 ) + , mnWUnderlineOffset( 0 ) + , mnAboveUnderlineSize( 0 ) + , mnAboveUnderlineOffset( 0 ) + , mnAboveBUnderlineSize( 0 ) + , mnAboveBUnderlineOffset( 0 ) + , mnAboveDUnderlineSize( 0 ) + , mnAboveDUnderlineOffset1( 0 ) + , mnAboveDUnderlineOffset2( 0 ) + , mnAboveWUnderlineSize( 0 ) + , mnAboveWUnderlineOffset( 0 ) + , mnStrikeoutSize( 0 ) + , mnStrikeoutOffset( 0 ) + , mnBStrikeoutSize( 0 ) + , mnBStrikeoutOffset( 0 ) + , mnDStrikeoutSize( 0 ) + , mnDStrikeoutOffset1( 0 ) + , mnDStrikeoutOffset2( 0 ) +{ + // initialize the used font name + sal_Int32 nTokenPos = 0; + SetFamilyName( GetNextFontToken( rFontSelData.GetFamilyName(), nTokenPos ) ); + SetStyleName( rFontSelData.GetStyleName() ); +} + +void ImplFontMetricData::ImplInitTextLineSize( const OutputDevice* pDev ) +{ + long nDescent = mnDescent; + if ( nDescent <= 0 ) + { + nDescent = mnAscent / 10; + if ( !nDescent ) + nDescent = 1; + } + + // #i55341# for some fonts it is not a good idea to calculate + // their text line metrics from the real font descent + // => work around this problem just for these fonts + if( 3*nDescent > mnAscent ) + nDescent = mnAscent / 3; + + long nLineHeight = ((nDescent*25)+50) / 100; + if ( !nLineHeight ) + nLineHeight = 1; + long nLineHeight2 = nLineHeight / 2; + if ( !nLineHeight2 ) + nLineHeight2 = 1; + + long nBLineHeight = ((nDescent*50)+50) / 100; + if ( nBLineHeight == nLineHeight ) + nBLineHeight++; + long nBLineHeight2 = nBLineHeight/2; + if ( !nBLineHeight2 ) + nBLineHeight2 = 1; + + long n2LineHeight = ((nDescent*16)+50) / 100; + if ( !n2LineHeight ) + n2LineHeight = 1; + long n2LineDY = n2LineHeight; + /* #117909# + * add some pixels to minimum double line distance on higher resolution devices + */ + long nMin2LineDY = 1 + pDev->GetDPIY()/150; + if ( n2LineDY < nMin2LineDY ) + n2LineDY = nMin2LineDY; + long n2LineDY2 = n2LineDY/2; + if ( !n2LineDY2 ) + n2LineDY2 = 1; + + const vcl::Font& rFont ( pDev->GetFont() ); + bool bCJKVertical = MsLangId::isCJK(rFont.GetLanguage()) && rFont.IsVertical(); + long nUnderlineOffset = bCJKVertical ? mnDescent : (mnDescent/2 + 1); + long nStrikeoutOffset = -((mnAscent - mnIntLeading) / 3); + + mnUnderlineSize = nLineHeight; + mnUnderlineOffset = nUnderlineOffset - nLineHeight2; + + mnBUnderlineSize = nBLineHeight; + mnBUnderlineOffset = nUnderlineOffset - nBLineHeight2; + + mnDUnderlineSize = n2LineHeight; + mnDUnderlineOffset1 = nUnderlineOffset - n2LineDY2 - n2LineHeight; + mnDUnderlineOffset2 = mnDUnderlineOffset1 + n2LineDY + n2LineHeight; + + long nWCalcSize = mnDescent; + if ( nWCalcSize < 6 ) + { + if ( (nWCalcSize == 1) || (nWCalcSize == 2) ) + mnWUnderlineSize = nWCalcSize; + else + mnWUnderlineSize = 3; + } + else + mnWUnderlineSize = ((nWCalcSize*50)+50) / 100; + + + // Don't assume that wavelines are never placed below the descent, because for most fonts the waveline + // is drawn into the text + mnWUnderlineOffset = nUnderlineOffset; + + mnStrikeoutSize = nLineHeight; + mnStrikeoutOffset = nStrikeoutOffset - nLineHeight2; + + mnBStrikeoutSize = nBLineHeight; + mnBStrikeoutOffset = nStrikeoutOffset - nBLineHeight2; + + mnDStrikeoutSize = n2LineHeight; + mnDStrikeoutOffset1 = nStrikeoutOffset - n2LineDY2 - n2LineHeight; + mnDStrikeoutOffset2 = mnDStrikeoutOffset1 + n2LineDY + n2LineHeight; + + mnBulletOffset = ( pDev->GetTextWidth( OUString( u' ' ) ) - pDev->GetTextWidth( OUString( u'\x00b7' ) ) ) >> 1 ; + +} + + +void ImplFontMetricData::ImplInitAboveTextLineSize() +{ + long nIntLeading = mnIntLeading; + // TODO: assess usage of nLeading below (changed in extleading CWS) + // if no leading is available, we assume 15% of the ascent + if ( nIntLeading <= 0 ) + { + nIntLeading = mnAscent*15/100; + if ( !nIntLeading ) + nIntLeading = 1; + } + + long nLineHeight = ((nIntLeading*25)+50) / 100; + if ( !nLineHeight ) + nLineHeight = 1; + + long nBLineHeight = ((nIntLeading*50)+50) / 100; + if ( nBLineHeight == nLineHeight ) + nBLineHeight++; + + long n2LineHeight = ((nIntLeading*16)+50) / 100; + if ( !n2LineHeight ) + n2LineHeight = 1; + + long nCeiling = -mnAscent; + + mnAboveUnderlineSize = nLineHeight; + mnAboveUnderlineOffset = nCeiling + (nIntLeading - nLineHeight + 1) / 2; + + mnAboveBUnderlineSize = nBLineHeight; + mnAboveBUnderlineOffset = nCeiling + (nIntLeading - nBLineHeight + 1) / 2; + + mnAboveDUnderlineSize = n2LineHeight; + mnAboveDUnderlineOffset1 = nCeiling + (nIntLeading - 3*n2LineHeight + 1) / 2; + mnAboveDUnderlineOffset2 = nCeiling + (nIntLeading + n2LineHeight + 1) / 2; + + long nWCalcSize = nIntLeading; + if ( nWCalcSize < 6 ) + { + if ( (nWCalcSize == 1) || (nWCalcSize == 2) ) + mnAboveWUnderlineSize = nWCalcSize; + else + mnAboveWUnderlineSize = 3; + } + else + mnAboveWUnderlineSize = ((nWCalcSize*50)+50) / 100; + + mnAboveWUnderlineOffset = nCeiling + (nIntLeading + 1) / 2; +} + +void ImplFontMetricData::ImplInitFlags( const OutputDevice* pDev ) +{ + const vcl::Font& rFont ( pDev->GetFont() ); + bool bCentered = true; + if (MsLangId::isCJK(rFont.GetLanguage())) + { + const OUString sFullstop( u'\x3001' ); // Fullwidth fullstop + tools::Rectangle aRect; + pDev->GetTextBoundRect( aRect, sFullstop ); + const auto nH = rFont.GetFontSize().Height(); + const auto nB = aRect.Left(); + // Use 18.75% as a threshold to define a centered fullwidth fullstop. + // In general, nB/nH < 5% for most Japanese fonts. + bCentered = nB > (((nH >> 1)+nH)>>3); + } + SetFullstopCenteredFlag( bCentered ); +} + +bool ImplFontMetricData::ShouldUseWinMetrics(const vcl::TTGlobalFontInfo& rInfo) +{ + if (utl::ConfigManager::IsFuzzing()) + return false; + + OUString aFontIdentifier( + GetFamilyName() + "," + + OUString::number(rInfo.ascender) + "," + OUString::number(rInfo.descender) + "," + + OUString::number(rInfo.typoAscender) + "," + OUString::number(rInfo.typoDescender) + "," + + OUString::number(rInfo.winAscent) + "," + OUString::number(rInfo.winDescent)); + + css::uno::Sequence<OUString> rWinMetricFontList( + officecfg::Office::Common::Misc::FontsUseWinMetrics::get()); + if (comphelper::findValue(rWinMetricFontList, aFontIdentifier) != -1) + { + SAL_INFO("vcl.gdi.fontmetric", "Using win metrics for: " << aFontIdentifier); + return true; + } + return false; +} + +/* + * Calculate line spacing: + * + * - hhea metrics should be used, since hhea is a mandatory font table and + * should always be present. + * - But if OS/2 is present, it should be used since it is mandatory in + * Windows. + * OS/2 has Typo and Win metrics, but the later was meant to control + * text clipping not line spacing and can be ridiculously large. + * Unfortunately many Windows application incorrectly use the Win metrics + * (thanks to GDI’s TEXTMETRIC) and old fonts might be designed with this + * in mind, so OpenType introduced a flag for fonts to indicate that they + * really want to use Typo metrics. So for best backward compatibility: + * - Use Win metrics if available. + * - Unless USE_TYPO_METRICS flag is set, in which case use Typo metrics. +*/ +void ImplFontMetricData::ImplCalcLineSpacing(LogicalFontInstance *pFontInstance) +{ + mnAscent = mnDescent = mnExtLeading = mnIntLeading = 0; + + hb_font_t* pHbFont = pFontInstance->GetHbFont(); + hb_face_t* pHbFace = hb_font_get_face(pHbFont); + + hb_blob_t* pHhea = hb_face_reference_table(pHbFace, HB_TAG('h', 'h', 'e', 'a')); + hb_blob_t* pOS2 = hb_face_reference_table(pHbFace, HB_TAG('O', 'S', '/', '2')); + + vcl::TTGlobalFontInfo rInfo = {}; + GetTTFontMetrics(reinterpret_cast<const uint8_t*>(hb_blob_get_data(pHhea, nullptr)), hb_blob_get_length(pHhea), + reinterpret_cast<const uint8_t*>(hb_blob_get_data(pOS2, nullptr)), hb_blob_get_length(pOS2), + &rInfo); + + hb_blob_destroy(pHhea); + hb_blob_destroy(pOS2); + + double nUPEM = hb_face_get_upem(pHbFace); + double fScale = mnHeight / nUPEM; + double fAscent = 0, fDescent = 0, fExtLeading = 0; + + // Try hhea table first. + // tdf#107605: Some fonts have weird values here, so check that ascender is + // +ve and descender is -ve as they normally should. + if (rInfo.ascender >= 0 && rInfo.descender <= 0) + { + fAscent = rInfo.ascender * fScale; + fDescent = -rInfo.descender * fScale; + fExtLeading = rInfo.linegap * fScale; + } + + // But if OS/2 is present, prefer it. + if (rInfo.winAscent || rInfo.winDescent || + rInfo.typoAscender || rInfo.typoDescender) + { + if (ShouldUseWinMetrics(rInfo) || (fAscent == 0.0 && fDescent == 0.0)) + { + fAscent = rInfo.winAscent * fScale; + fDescent = rInfo.winDescent * fScale; + fExtLeading = 0; + } + + const uint16_t kUseTypoMetricsMask = 1 << 7; + if (rInfo.fsSelection & kUseTypoMetricsMask && + rInfo.typoAscender >= 0 && rInfo.typoDescender <= 0) + { + fAscent = rInfo.typoAscender * fScale; + fDescent = -rInfo.typoDescender * fScale; + fExtLeading = rInfo.typoLineGap * fScale; + } + } + + mnAscent = round(fAscent); + mnDescent = round(fDescent); + mnExtLeading = round(fExtLeading); + + if (mnAscent || mnDescent) + mnIntLeading = mnAscent + mnDescent - mnHeight; + + SAL_INFO("vcl.gdi.fontmetric", GetFamilyName() + << ": fsSelection: " << rInfo.fsSelection + << ", typoAscender: " << rInfo.typoAscender + << ", typoDescender: " << rInfo.typoDescender + << ", typoLineGap: " << rInfo.typoLineGap + << ", winAscent: " << rInfo.winAscent + << ", winDescent: " << rInfo.winDescent + << ", ascender: " << rInfo.ascender + << ", descender: " << rInfo.descender + << ", linegap: " << rInfo.linegap + ); +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |