144 lines
4.5 KiB
C++
144 lines
4.5 KiB
C++
/*
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* Copyright (C) 2006, 2009 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef GlyphMetricsMap_h
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#define GlyphMetricsMap_h
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#include "Glyph.h"
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#include "Path.h"
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#include <array>
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#include <wtf/HashMap.h>
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namespace WebCore {
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const float cGlyphSizeUnknown = -1;
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template<class T> class GlyphMetricsMap {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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T metricsForGlyph(Glyph glyph)
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{
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return locatePage(glyph / GlyphMetricsPage::size).metricsForGlyph(glyph);
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}
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const T& existingMetricsForGlyph(Glyph glyph)
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{
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return locatePage(glyph / GlyphMetricsPage::size).existingMetricsForGlyph(glyph);
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}
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void setMetricsForGlyph(Glyph glyph, const T& metrics)
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{
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locatePage(glyph / GlyphMetricsPage::size).setMetricsForGlyph(glyph, metrics);
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}
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private:
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class GlyphMetricsPage {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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static const size_t size = 16;
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GlyphMetricsPage() = default;
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explicit GlyphMetricsPage(const T& initialValue)
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{
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fill(initialValue);
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}
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void fill(const T& value)
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{
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m_metrics.fill(value);
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}
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T metricsForGlyph(Glyph glyph) const { return m_metrics[glyph % size]; }
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const T& existingMetricsForGlyph(Glyph glyph) const { return m_metrics[glyph % size]; }
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void setMetricsForGlyph(Glyph glyph, const T& metrics)
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{
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setMetricsForIndex(glyph % size, metrics);
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}
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private:
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void setMetricsForIndex(unsigned index, const T& metrics)
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{
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m_metrics[index] = metrics;
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}
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std::array<T, size> m_metrics;
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};
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GlyphMetricsPage& locatePage(unsigned pageNumber)
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{
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if (!pageNumber && m_filledPrimaryPage)
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return m_primaryPage;
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return locatePageSlowCase(pageNumber);
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}
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GlyphMetricsPage& locatePageSlowCase(unsigned pageNumber);
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static T unknownMetrics();
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bool m_filledPrimaryPage { false };
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GlyphMetricsPage m_primaryPage; // We optimize for the page that contains glyph indices 0-255.
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std::unique_ptr<HashMap<int, std::unique_ptr<GlyphMetricsPage>>> m_pages;
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};
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template<> inline float GlyphMetricsMap<float>::unknownMetrics()
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{
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return cGlyphSizeUnknown;
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}
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template<> inline FloatRect GlyphMetricsMap<FloatRect>::unknownMetrics()
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{
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return FloatRect(0, 0, cGlyphSizeUnknown, cGlyphSizeUnknown);
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}
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template<> inline std::optional<Path> GlyphMetricsMap<std::optional<Path>>::unknownMetrics()
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{
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return std::nullopt;
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}
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template<class T> typename GlyphMetricsMap<T>::GlyphMetricsPage& GlyphMetricsMap<T>::locatePageSlowCase(unsigned pageNumber)
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{
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if (!pageNumber) {
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ASSERT(!m_filledPrimaryPage);
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m_primaryPage.fill(unknownMetrics());
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m_filledPrimaryPage = true;
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return m_primaryPage;
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}
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if (!m_pages)
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m_pages = makeUnique<HashMap<int, std::unique_ptr<GlyphMetricsPage>>>();
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auto& page = m_pages->ensure(pageNumber, [] {
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return makeUnique<GlyphMetricsPage>(unknownMetrics());
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}).iterator->value;
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return *page;
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}
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} // namespace WebCore
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#endif
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