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295f920116
I wrote a script to do this which is attached to the bug. TBR=abarth@chromium.org BUG=435361 Review URL: https://codereview.chromium.org/736373003
132 lines
4.6 KiB
C++
132 lines
4.6 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 Computer, 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 SKY_ENGINE_PLATFORM_FONTS_GLYPHMETRICSMAP_H_
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#define SKY_ENGINE_PLATFORM_FONTS_GLYPHMETRICSMAP_H_
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#include "sky/engine/platform/fonts/Glyph.h"
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#include "sky/engine/platform/geometry/FloatRect.h"
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#include "sky/engine/wtf/Assertions.h"
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#include "sky/engine/wtf/HashMap.h"
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#include "sky/engine/wtf/OwnPtr.h"
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#include "sky/engine/wtf/PassOwnPtr.h"
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#include "sky/engine/wtf/unicode/Unicode.h"
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namespace blink {
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const float cGlyphSizeUnknown = -1;
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template<class T> class GlyphMetricsMap {
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WTF_MAKE_NONCOPYABLE(GlyphMetricsMap);
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public:
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GlyphMetricsMap() : m_filledPrimaryPage(false) { }
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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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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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public:
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static const size_t size = 256; // Usually covers Latin-1 in a single page.
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T metricsForGlyph(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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void setMetricsForIndex(unsigned index, const T& metrics)
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{
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ASSERT_WITH_SECURITY_IMPLICATION(index < size);
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m_metrics[index] = metrics;
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}
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private:
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T m_metrics[size];
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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;
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GlyphMetricsPage m_primaryPage; // We optimize for the page that contains glyph indices 0-255.
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OwnPtr<HashMap<int, OwnPtr<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<class T> typename GlyphMetricsMap<T>::GlyphMetricsPage* GlyphMetricsMap<T>::locatePageSlowCase(unsigned pageNumber)
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{
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GlyphMetricsPage* page;
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if (!pageNumber) {
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ASSERT(!m_filledPrimaryPage);
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page = &m_primaryPage;
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m_filledPrimaryPage = true;
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} else {
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if (m_pages) {
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page = m_pages->get(pageNumber);
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if (page)
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return page;
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} else
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m_pages = adoptPtr(new HashMap<int, OwnPtr<GlyphMetricsPage> >);
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page = new GlyphMetricsPage;
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m_pages->set(pageNumber, adoptPtr(page));
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}
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// Fill in the whole page with the unknown glyph information.
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for (unsigned i = 0; i < GlyphMetricsPage::size; i++)
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page->setMetricsForIndex(i, unknownMetrics());
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return page;
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}
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} // namespace blink
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#endif // SKY_ENGINE_PLATFORM_FONTS_GLYPHMETRICSMAP_H_
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