office-gobmx/vcl/inc/impfontcharmap.hxx
Jan-Marek Glogowski c7482bc290 Replace FindCmap with ParseCMAP
This introduces a potential performance regression, because
FindCmap works on the existing font tables and just sets up
a lookup function, while ParseCMAP creates some optimized,
in-memory lookup table, which needs a bit more work, but
is faster in its usage, I think. At least the initial usage
is faster the old way, as the CMAPs aren't decoded at all.

As you can see, the old code is just used on Windows and
MacOS / iOS. Deep in the bowels of the PrintFontManager, the
CMAP is also decoded using ParseCMAP...

So I'm not sure this potential regression really exists. Most
fonts will already have a decoded CMAP, so my guess is this
is actually faster in the end. No idea, how to measure.

Change-Id: I52caac1264cd3ff11a2a3fa6e9c800f67f146a79
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/102685
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>
2020-09-15 06:42:33 +02:00

59 lines
2.1 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
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* 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/.
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* This file incorporates work covered by the following license notice:
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
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* 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
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*/
#ifndef INCLUDED_VCL_INC_IMPFONTCHARMAP_HXX
#define INCLUDED_VCL_INC_IMPFONTCHARMAP_HXX
#include <tools/ref.hxx>
#include <vcl/dllapi.h>
class ImplFontCharMap;
typedef tools::SvRef<ImplFontCharMap> ImplFontCharMapRef;
class CmapResult;
class ImplFontCharMap : public SvRefBase
{
public:
explicit ImplFontCharMap( const CmapResult& );
virtual ~ImplFontCharMap() override;
private:
friend class FontCharMap;
ImplFontCharMap( const ImplFontCharMap& ) = delete;
void operator=( const ImplFontCharMap& ) = delete;
static ImplFontCharMapRef const & getDefaultMap( bool bSymbols=false);
bool isDefaultMap() const;
private:
const sal_uInt32* mpRangeCodes; // pairs of StartCode/(EndCode+1)
const int* mpStartGlyphs; // range-specific mapper to glyphs
const sal_uInt16* mpGlyphIds; // individual glyphid mappings
int mnRangeCount;
int mnCharCount; // covered codepoints
const bool m_bSymbolic;
};
bool VCL_DLLPUBLIC ParseCMAP( const unsigned char* pRawData, int nRawLength, CmapResult& );
#endif // INCLUDED_VCL_INC_IMPFONTCHARMAP_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */