61 lines
2 KiB
C++
61 lines
2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#include "nsComplexBreaker.h"
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#include <algorithm>
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#include "LineBreakCache.h"
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#include "MainThreadUtils.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/Services.h"
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#include "mozilla/StaticPtr.h"
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#include "mozilla/UniquePtr.h"
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#include "nsTHashMap.h"
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#include "nsIObserver.h"
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#include "nsIObserverService.h"
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#include "nsString.h"
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#include "nsTArray.h"
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#include "nsThreadUtils.h"
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using namespace mozilla;
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using namespace mozilla::intl;
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void ComplexBreaker::GetBreaks(const char16_t* aText, uint32_t aLength,
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uint8_t* aBreakBefore) {
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// It is believed that this is only called on the main thread, so we don't
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// need to lock the caching structures. A diagnostic assert is used in case
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// our tests don't exercise all code paths.
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MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(aText, "aText shouldn't be null");
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MOZ_ASSERT(aLength, "aLength shouldn't be zero");
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MOZ_ASSERT(aBreakBefore, "aBreakBefore shouldn't be null");
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// Check the cache.
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LineBreakCache::KeyType key{aText, aLength};
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auto entry = LineBreakCache::Cache()->Lookup(key);
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if (entry) {
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auto& breakBefore = entry.Data().mBreaks;
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LineBreakCache::CopyAndFill(breakBefore, aBreakBefore,
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aBreakBefore + aLength);
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return;
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}
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NS_GetComplexLineBreaks(aText, aLength, aBreakBefore);
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// As a very simple memory saving measure we trim off trailing elements that
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// are false before caching.
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auto* afterLastTrue = aBreakBefore + aLength;
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while (!*(afterLastTrue - 1)) {
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if (--afterLastTrue == aBreakBefore) {
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break;
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}
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}
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entry.Set(LineBreakCache::EntryType{
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nsString(aText, aLength),
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nsTArray<uint8_t>(aBreakBefore, afterLastTrue - aBreakBefore)});
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}
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