diff options
Diffstat (limited to 'src/3rdparty/webkit/WebCore/platform/graphics/GlyphMetricsMap.h')
-rw-r--r-- | src/3rdparty/webkit/WebCore/platform/graphics/GlyphMetricsMap.h | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/src/3rdparty/webkit/WebCore/platform/graphics/GlyphMetricsMap.h b/src/3rdparty/webkit/WebCore/platform/graphics/GlyphMetricsMap.h new file mode 100644 index 0000000..49854be --- /dev/null +++ b/src/3rdparty/webkit/WebCore/platform/graphics/GlyphMetricsMap.h @@ -0,0 +1,104 @@ +/* + * Copyright (C) 2006, 2009 Apple Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of + * its contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef GlyphMetricsMap_h +#define GlyphMetricsMap_h + +#include "FloatRect.h" +#include <wtf/HashMap.h> +#include <wtf/OwnPtr.h> +#include <wtf/unicode/Unicode.h> + +namespace WebCore { + +typedef unsigned short Glyph; + +const float cGlyphSizeUnknown = -1; + +struct GlyphMetrics { + float horizontalAdvance; + FloatRect boundingBox; +}; + +class GlyphMetricsMap : public Noncopyable { +public: + GlyphMetricsMap() : m_filledPrimaryPage(false) { } + ~GlyphMetricsMap() + { + if (m_pages) + deleteAllValues(*m_pages); + } + + GlyphMetrics metricsForGlyph(Glyph glyph) + { + return locatePage(glyph / GlyphMetricsPage::size)->metricsForGlyph(glyph); + } + + float widthForGlyph(Glyph glyph) + { + return locatePage(glyph / GlyphMetricsPage::size)->metricsForGlyph(glyph).horizontalAdvance; + } + + void setMetricsForGlyph(Glyph glyph, const GlyphMetrics& metrics) + { + locatePage(glyph / GlyphMetricsPage::size)->setMetricsForGlyph(glyph, metrics); + } + +private: + struct GlyphMetricsPage { + static const size_t size = 256; // Usually covers Latin-1 in a single page. + GlyphMetrics m_metrics[size]; + + GlyphMetrics metricsForGlyph(Glyph glyph) const { return m_metrics[glyph % size]; } + void setMetricsForGlyph(Glyph glyph, const GlyphMetrics& metrics) + { + setMetricsForIndex(glyph % size, metrics); + } + void setMetricsForIndex(unsigned index, const GlyphMetrics& metrics) + { + m_metrics[index] = metrics; + } + }; + + GlyphMetricsPage* locatePage(unsigned pageNumber) + { + if (!pageNumber && m_filledPrimaryPage) + return &m_primaryPage; + return locatePageSlowCase(pageNumber); + } + + GlyphMetricsPage* locatePageSlowCase(unsigned pageNumber); + + bool m_filledPrimaryPage; + GlyphMetricsPage m_primaryPage; // We optimize for the page that contains glyph indices 0-255. + OwnPtr<HashMap<int, GlyphMetricsPage*> > m_pages; +}; + +} // namespace WebCore + +#endif |