55d62057c0
hb_icu_script_to_script is used in CommonSalLayout.cxx only Change-Id: I1d8de8c420963b42623bb06a7f5e1f37986e1c16 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/149935 Tested-by: Jenkins Reviewed-by: خالد حسني <khaled@libreoffice.org>
87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#pragma once
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#include <sal/types.h>
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#include <rtl/ustring.hxx>
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#include <o3tl/hash_combine.hxx>
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#include <vcl/dllapi.h>
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#include <unicode/uscript.h>
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#include <vector>
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namespace vcl::text
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{
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struct Run
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{
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int32_t nStart;
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int32_t nEnd;
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UScriptCode nCode;
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Run(int32_t nStart_, int32_t nEnd_, UScriptCode nCode_)
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: nStart(nStart_)
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, nEnd(nEnd_)
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, nCode(nCode_)
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{
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}
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};
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class VCL_DLLPUBLIC TextLayoutCache
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{
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public:
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std::vector<vcl::text::Run> runs;
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TextLayoutCache(sal_Unicode const* pStr, sal_Int32 const nEnd);
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// Creates a cached instance.
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static std::shared_ptr<const vcl::text::TextLayoutCache> Create(OUString const&);
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};
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struct FirstCharsStringHash
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{
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size_t operator()(const OUString& str) const
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{
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// Strings passed to GenericSalLayout::CreateTextLayoutCache() may be very long,
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// and computing an entire hash could almost negate the gain of hashing. Hash just first
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// characters, that should be good enough.
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size_t hash
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= rtl_ustr_hashCode_WithLength(str.getStr(), std::min<size_t>(100, str.getLength()));
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o3tl::hash_combine(hash, str.getLength());
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return hash;
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}
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};
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struct FastStringCompareEqual
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{
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bool operator()(const OUString& str1, const OUString& str2) const
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{
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// Strings passed to GenericSalLayout::CreateTextLayoutCache() may be very long,
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// and OUString operator == compares backwards and using hard-written code, while
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// memcmp() compares much faster.
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if (str1.getLength() != str2.getLength())
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return false;
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if (str1.getStr() == str2.getStr())
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return true;
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return memcmp(str1.getStr(), str2.getStr(), str1.getLength() * sizeof(str1.getStr()[0]))
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== 0;
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}
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};
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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