135 lines
4.3 KiB
C++
135 lines
4.3 KiB
C++
/*
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* Copyright (C) 2006, 2007, 2008, 2013 Apple Inc. All rights reserved.
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* Copyright (C) Research In Motion Limited 2011. 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 GlyphPage_h
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#define GlyphPage_h
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#include "Glyph.h"
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#include <unicode/utypes.h>
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#include <wtf/RefCounted.h>
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#include <wtf/Ref.h>
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namespace WebCore {
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class Font;
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// Holds the glyph index and the corresponding Font information for a given
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// character.
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struct GlyphData {
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GlyphData(Glyph glyph = 0, const Font* font = nullptr)
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: glyph(glyph)
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, font(font)
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{
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}
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bool isValid() const { return glyph || font; }
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Glyph glyph;
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const Font* font;
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};
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// A GlyphPage contains a fixed-size set of GlyphData mappings for a contiguous
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// range of characters in the Unicode code space. GlyphPages are indexed
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// starting from 0 and incrementing for each "size" number of glyphs.
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class GlyphPage : public RefCounted<GlyphPage> {
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public:
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static Ref<GlyphPage> create(const Font& font)
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{
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return adoptRef(*new GlyphPage(font));
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}
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~GlyphPage()
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{
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--s_count;
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}
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static unsigned count() { return s_count; }
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static const unsigned size = 16;
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static unsigned sizeForPageNumber(unsigned) { return 16; }
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static unsigned indexForCodePoint(UChar32 c) { return c % size; }
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static unsigned pageNumberForCodePoint(UChar32 c) { return c / size; }
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static UChar32 startingCodePointInPageNumber(unsigned pageNumber) { return pageNumber * size; }
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static bool pageNumberIsUsedForArabic(unsigned pageNumber) { return startingCodePointInPageNumber(pageNumber) >= 0x600 && startingCodePointInPageNumber(pageNumber) + sizeForPageNumber(pageNumber) < 0x700; }
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GlyphData glyphDataForCharacter(UChar32 c) const
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{
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return glyphDataForIndex(indexForCodePoint(c));
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}
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Glyph glyphForCharacter(UChar32 c) const
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{
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return glyphForIndex(indexForCodePoint(c));
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}
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GlyphData glyphDataForIndex(unsigned index) const
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{
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Glyph glyph = glyphForIndex(index);
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return GlyphData(glyph, glyph ? &m_font : nullptr);
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}
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Glyph glyphForIndex(unsigned index) const
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{
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ASSERT_WITH_SECURITY_IMPLICATION(index < size);
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return m_glyphs[index];
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}
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// FIXME: Pages are immutable after initialization. This should be private.
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void setGlyphForIndex(unsigned index, Glyph glyph)
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{
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ASSERT_WITH_SECURITY_IMPLICATION(index < size);
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m_glyphs[index] = glyph;
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}
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const Font& font() const
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{
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return m_font;
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}
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// Implemented by the platform.
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bool fill(UChar* characterBuffer, unsigned bufferLength);
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private:
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explicit GlyphPage(const Font& font)
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: m_font(font)
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{
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++s_count;
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}
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const Font& m_font;
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Glyph m_glyphs[size] { };
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WEBCORE_EXPORT static unsigned s_count;
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};
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} // namespace WebCore
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#endif // GlyphPage_h
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