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