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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 <hb-ot.h>
#include <hb-graphite2.h>
#include <font/PhysicalFontFace.hxx>
#include <font/LogicalFontInstance.hxx>
#include <impfontcache.hxx>
LogicalFontInstance::LogicalFontInstance(const vcl::font::PhysicalFontFace& rFontFace,
const vcl::font::FontSelectPattern& rFontSelData)
: mxFontMetric(new ImplFontMetricData(rFontSelData))
, mpConversion(nullptr)
, mnLineHeight(0)
, mnOwnOrientation(0)
, mnOrientation(0)
, mbInit(false)
, mpFontCache(nullptr)
, m_aFontSelData(rFontSelData)
, m_pHbFont(nullptr)
, m_nAveWidthFactor(1.0f)
, m_pFontFace(&const_cast<vcl::font::PhysicalFontFace&>(rFontFace))
{
}
LogicalFontInstance::~LogicalFontInstance()
{
maUnicodeFallbackList.clear();
mpFontCache = nullptr;
mxFontMetric = nullptr;
if (m_pHbFont)
hb_font_destroy(m_pHbFont);
}
hb_font_t* LogicalFontInstance::InitHbFont()
{
auto pFace = GetFontFace();
hb_face_t* pHbFace = pFace->GetHbFace();
assert(pHbFace);
hb_font_t* pHbFont = hb_font_create(pHbFace);
auto nUPEM = pFace->UnitsPerEm();
hb_font_set_scale(pHbFont, nUPEM, nUPEM);
hb_ot_font_set_funcs(pHbFont);
ImplInitHbFont(pHbFont);
return pHbFont;
}
int LogicalFontInstance::GetKashidaWidth() const
{
sal_GlyphId nGlyph = GetGlyphIndex(0x0640);
if (nGlyph)
return std::ceil(GetGlyphWidth(nGlyph));
return 0;
}
void LogicalFontInstance::GetScale(double* nXScale, double* nYScale) const
{
double nUPEM = GetFontFace()->UnitsPerEm();
double nHeight(m_aFontSelData.mnHeight);
// On Windows, mnWidth is relative to average char width not font height,
// and we need to keep it that way for GDI to correctly scale the glyphs.
// Here we compensate for this so that HarfBuzz gives us the correct glyph
// positions.
double nWidth(m_aFontSelData.mnWidth ? m_aFontSelData.mnWidth * m_nAveWidthFactor : nHeight);
if (nYScale)
*nYScale = nHeight / nUPEM;
if (nXScale)
*nXScale = nWidth / nUPEM;
}
void LogicalFontInstance::AddFallbackForUnicode(sal_UCS4 cChar, FontWeight eWeight,
const OUString& rFontName, bool bEmbolden,
const ItalicMatrix& rMatrix)
{
MapEntry& rEntry = maUnicodeFallbackList[std::pair<sal_UCS4, FontWeight>(cChar, eWeight)];
rEntry.sFontName = rFontName;
rEntry.bEmbolden = bEmbolden;
rEntry.aItalicMatrix = rMatrix;
}
bool LogicalFontInstance::GetFallbackForUnicode(sal_UCS4 cChar, FontWeight eWeight,
OUString* pFontName, bool* pEmbolden,
ItalicMatrix* pMatrix) const
{
UnicodeFallbackList::const_iterator it
= maUnicodeFallbackList.find(std::pair<sal_UCS4, FontWeight>(cChar, eWeight));
if (it == maUnicodeFallbackList.end())
return false;
const MapEntry& rEntry = (*it).second;
*pFontName = rEntry.sFontName;
*pEmbolden = rEntry.bEmbolden;
*pMatrix = rEntry.aItalicMatrix;
return true;
}
void LogicalFontInstance::IgnoreFallbackForUnicode(sal_UCS4 cChar, FontWeight eWeight,
std::u16string_view rFontName)
{
UnicodeFallbackList::iterator it
= maUnicodeFallbackList.find(std::pair<sal_UCS4, FontWeight>(cChar, eWeight));
if (it == maUnicodeFallbackList.end())
return;
const MapEntry& rEntry = (*it).second;
if (rEntry.sFontName == rFontName)
maUnicodeFallbackList.erase(it);
}
bool LogicalFontInstance::GetGlyphBoundRect(sal_GlyphId nID, tools::Rectangle& rRect,
bool bVertical) const
{
if (mpFontCache && mpFontCache->GetCachedGlyphBoundRect(this, nID, rRect))
return true;
bool res = ImplGetGlyphBoundRect(nID, rRect, bVertical);
if (mpFontCache && res)
mpFontCache->CacheGlyphBoundRect(this, nID, rRect);
return res;
}
sal_GlyphId LogicalFontInstance::GetGlyphIndex(uint32_t nUnicode, uint32_t nVariationSelector) const
{
auto* pHbFont = const_cast<LogicalFontInstance*>(this)->GetHbFont();
sal_GlyphId nGlyph = 0;
if (hb_font_get_glyph(pHbFont, nUnicode, nVariationSelector, &nGlyph))
return nGlyph;
return 0;
}
double LogicalFontInstance::GetGlyphWidth(sal_GlyphId nGlyph, bool bVertical, bool bScale) const
{
auto* pHbFont = const_cast<LogicalFontInstance*>(this)->GetHbFont();
int nWidth;
if (bVertical)
nWidth = hb_font_get_glyph_v_advance(pHbFont, nGlyph);
else
nWidth = hb_font_get_glyph_h_advance(pHbFont, nGlyph);
if (!bScale)
return nWidth;
double nScale = 0;
GetScale(&nScale, nullptr);
return double(nWidth * nScale);
}
bool LogicalFontInstance::IsGraphiteFont()
{
if (!m_xbIsGraphiteFont)
{
m_xbIsGraphiteFont
= hb_graphite2_face_get_gr_face(hb_font_get_face(GetHbFont())) != nullptr;
}
return *m_xbIsGraphiteFont;
}
bool LogicalFontInstance::NeedOffsetCorrection(sal_Int32 nYOffset)
{
if (!m_xeFontFamilyEnum)
{
m_xeFontFamilyEnum = FontFamilyEnum::Unclassified;
// DFKai-SB (ukai.ttf) is a built-in font under traditional Chinese
// Windows. It has wrong extent values in glyf table. The problem results
// in wrong positioning of glyphs in vertical writing.
// Check https://github.com/harfbuzz/harfbuzz/issues/3521 for reference.
if (GetFontFace()->GetName(vcl::font::NAME_ID_FONT_FAMILY) == "DFKai-SB")
m_xeFontFamilyEnum = FontFamilyEnum::DFKaiSB;
}
bool bRet = true;
switch (*m_xeFontFamilyEnum)
{
case FontFamilyEnum::DFKaiSB:
// -839: optimization for one third of ukai.ttf
if (nYOffset == -839)
bRet = false;
break;
default:
bRet = false;
}
return bRet;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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