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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 <hb-ot.h>
#include <fontinstance.hxx>
#include <impfontcache.hxx>
#include <PhysicalFontFace.hxx>
// extend std namespace to add custom hash needed for LogicalFontInstance
namespace std
{
template <> struct hash< pair< sal_UCS4, FontWeight > >
{
size_t operator()(const pair< sal_UCS4, FontWeight >& rData) const
{
std::size_t seed = 0;
boost::hash_combine(seed, rData.first);
boost::hash_combine(seed, rData.second);
return seed;
}
};
}
LogicalFontInstance::LogicalFontInstance(const PhysicalFontFace& rFontFace, const 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<PhysicalFontFace&>(rFontFace))
{
}
LogicalFontInstance::~LogicalFontInstance()
{
mpUnicodeFallbackList.reset();
mpFontCache = nullptr;
mxFontMetric = nullptr;
if (m_pHbFont)
hb_font_destroy(m_pHbFont);
}
hb_font_t* LogicalFontInstance::InitHbFont(hb_face_t* pHbFace)
{
assert(pHbFace);
hb_font_t* pHbFont = hb_font_create(pHbFace);
unsigned int nUPEM = hb_face_get_upem(pHbFace);
hb_font_set_scale(pHbFont, nUPEM, nUPEM);
hb_ot_font_set_funcs(pHbFont);
return pHbFont;
}
int LogicalFontInstance::GetKashidaWidth()
{
hb_font_t* pHbFont = GetHbFont();
hb_position_t nWidth = 0;
hb_codepoint_t nIndex = 0;
if (hb_font_get_glyph(pHbFont, 0x0640, 0, &nIndex))
{
double nXScale = 0;
GetScale(&nXScale, nullptr);
nWidth = hb_font_get_glyph_h_advance(pHbFont, nIndex) * nXScale;
}
return nWidth;
}
void LogicalFontInstance::GetScale(double* nXScale, double* nYScale)
{
hb_face_t* pHbFace = hb_font_get_face(GetHbFont());
unsigned int nUPEM = hb_face_get_upem(pHbFace);
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 )
{
if( !mpUnicodeFallbackList )
mpUnicodeFallbackList.reset(new UnicodeFallbackList);
(*mpUnicodeFallbackList)[ std::pair< sal_UCS4, FontWeight >(cChar,eWeight) ] = rFontName;
}
bool LogicalFontInstance::GetFallbackForUnicode( sal_UCS4 cChar, FontWeight eWeight, OUString* pFontName ) const
{
if( !mpUnicodeFallbackList )
return false;
UnicodeFallbackList::const_iterator it = mpUnicodeFallbackList->find( std::pair< sal_UCS4, FontWeight >(cChar,eWeight) );
if( it == mpUnicodeFallbackList->end() )
return false;
*pFontName = (*it).second;
return true;
}
void LogicalFontInstance::IgnoreFallbackForUnicode( sal_UCS4 cChar, FontWeight eWeight, const OUString& rFontName )
{
UnicodeFallbackList::iterator it = mpUnicodeFallbackList->find( std::pair< sal_UCS4,FontWeight >(cChar,eWeight) );
if( it == mpUnicodeFallbackList->end() )
return;
if( (*it).second == rFontName )
mpUnicodeFallbackList->erase( it );
}
bool LogicalFontInstance::GetGlyphBoundRect(sal_GlyphId nID, tools::Rectangle &rRect, bool bVertical)
{
if (mpFontCache && mpFontCache->GetCachedGlyphBoundRect(this, nID, rRect))
return true;
hb_font_t* pHbFont = GetHbFont();
hb_glyph_extents_t aExtents;
bool res = hb_font_get_glyph_extents(pHbFont, nID, &aExtents);
if (res)
{
double nXScale = 0, nYScale = 0;
GetScale(&nXScale, &nYScale);
double fMinX = aExtents.x_bearing;
double fMinY = aExtents.y_bearing;
double fMaxX = aExtents.x_bearing + aExtents.width;
double fMaxY = aExtents.y_bearing + aExtents.height;
tools::Rectangle aRect( std::floor(fMinX * nXScale),
-std::ceil(fMinY * nYScale),
std::ceil(fMaxX * nXScale),
-std::floor(fMaxY * nYScale));
if (mnOrientation && !bVertical)
{
// Apply font rotation.
const double fRad = basegfx::deg2rad(mnOrientation);
const double fCos = cos(fRad);
const double fSin = sin(fRad);
rRect.SetLeft( fCos * aRect.Left() + fSin * aRect.Top());
rRect.SetTop( -fSin * aRect.Left() - fCos * aRect.Top());
rRect.SetRight( fCos * aRect.Right() + fSin * aRect.Bottom());
rRect.SetBottom(-fSin * aRect.Right() - fCos * aRect.Bottom());
}
else
rRect = aRect;
}
else
{
// Fallback to platform implementations.
// TODO: remove once we require HarfBuzz >= 2.3.0
res = ImplGetGlyphBoundRect(nID, rRect, bVertical);
}
if (mpFontCache && res)
mpFontCache->CacheGlyphBoundRect(this, nID, rRect);
return res;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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