Move Glyph related classes to platform/fonts

Source/core/platform/graphics/GlyphPage.h

-/*
- * 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 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 GlyphPage_h
-#define GlyphPage_h
-
-#include "platform/fonts/Glyph.h"
-#include <string.h>
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefCounted.h"
-#include "wtf/RefPtr.h"
-#include "wtf/unicode/Unicode.h"
-
-namespace WebCore {
-
-class SimpleFontData;
-class GlyphPageTreeNode;
-
-// Holds the glyph index and the corresponding SimpleFontData information for a given
-// character.
-struct GlyphData {
-    GlyphData(Glyph g = 0, const SimpleFontData* f = 0)
-        : glyph(g)
-        , fontData(f)
-    {
-    }
-    Glyph glyph;
-    const SimpleFontData* fontData;
-};
-
-#if COMPILER(MSVC)
-#pragma warning(push)
-#pragma warning(disable: 4200) // Disable "zero-sized array in struct/union" warning
-#endif
-
-// 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 256 glyphs.
-//
-// One page may actually include glyphs from other fonts if the characters are
-// missing in the primary font. It is owned by exactly one GlyphPageTreeNode,
-// although multiple nodes may reference it as their "page" if they are supposed
-// to be overriding the parent's node, but provide no additional information.
-class GlyphPage : public RefCounted<GlyphPage> {
-public:
-    static PassRefPtr<GlyphPage> createForMixedFontData(GlyphPageTreeNode* owner)
-    {
-        void* slot = fastMalloc(sizeof(GlyphPage) + sizeof(SimpleFontData*) * GlyphPage::size);
-        return adoptRef(new (slot) GlyphPage(owner));
-    }
-
-    static PassRefPtr<GlyphPage> createForSingleFontData(GlyphPageTreeNode* owner, const SimpleFontData* fontData)
-    {
-        ASSERT(fontData);
-        return adoptRef(new GlyphPage(owner, fontData));
-    }
-
-    PassRefPtr<GlyphPage> createCopiedSystemFallbackPage(GlyphPageTreeNode* owner) const
-    {
-        RefPtr<GlyphPage> page = GlyphPage::createForMixedFontData(owner);
-        memcpy(page->m_glyphs, m_glyphs, sizeof(m_glyphs));
-        if (hasPerGlyphFontData())
-            memcpy(page->m_perGlyphFontData, m_perGlyphFontData, sizeof(SimpleFontData*) * GlyphPage::size);
-        else {
-            for (size_t i = 0; i < GlyphPage::size; ++i) {
-                page->m_perGlyphFontData[i] = m_glyphs[i] ? m_fontDataForAllGlyphs : 0;
-            }
-        }
-        return page.release();
-    }
-
-    ~GlyphPage() { }
-
-    static const size_t size = 256; // Covers Latin-1 in a single page.
-    static unsigned indexForCharacter(UChar32 c) { return c % GlyphPage::size; }
-
-    ALWAYS_INLINE GlyphData glyphDataForCharacter(UChar32 c) const
-    {
-        return glyphDataForIndex(indexForCharacter(c));
-    }
-
-    ALWAYS_INLINE GlyphData glyphDataForIndex(unsigned index) const
-    {
-        ASSERT_WITH_SECURITY_IMPLICATION(index < size);
-        Glyph glyph = m_glyphs[index];
-        if (hasPerGlyphFontData())
-            return GlyphData(glyph, m_perGlyphFontData[index]);
-        return GlyphData(glyph, glyph ? m_fontDataForAllGlyphs : 0);
-    }
-
-    ALWAYS_INLINE Glyph glyphForCharacter(UChar32 c) const
-    {
-        return glyphAt(indexForCharacter(c));
-    }
-
-    ALWAYS_INLINE Glyph glyphAt(unsigned index) const
-    {
-        ASSERT_WITH_SECURITY_IMPLICATION(index < size);
-        return m_glyphs[index];
-    }
-
-    ALWAYS_INLINE const SimpleFontData* fontDataForCharacter(UChar32 c) const
-    {
-        unsigned index = indexForCharacter(c);
-        if (hasPerGlyphFontData())
-            return m_perGlyphFontData[index];
-        return m_glyphs[index] ? m_fontDataForAllGlyphs : 0;
-    }
-
-    void setGlyphDataForCharacter(UChar32 c, Glyph g, const SimpleFontData* f)
-    {
-        setGlyphDataForIndex(indexForCharacter(c), g, f);
-    }
-
-    void setGlyphDataForIndex(unsigned index, Glyph glyph, const SimpleFontData* fontData)
-    {
-        ASSERT_WITH_SECURITY_IMPLICATION(index < size);
-        m_glyphs[index] = glyph;
-
-        // GlyphPage getters will always return a null SimpleFontData* for glyph #0 if there's no per-glyph font array.
-        if (hasPerGlyphFontData()) {
-            m_perGlyphFontData[index] = glyph ? fontData : 0;
-            return;
-        }
-
-        // A single-font GlyphPage already assigned m_fontDataForAllGlyphs in the constructor.
-        ASSERT(!glyph || fontData == m_fontDataForAllGlyphs);
-    }
-
-    void setGlyphDataForIndex(unsigned index, const GlyphData& glyphData)
-    {
-        setGlyphDataForIndex(index, glyphData.glyph, glyphData.fontData);
-    }
-
-    void removeFontDataFromSystemFallbackPage(const SimpleFontData* fontData)
-    {
-        // This method should only be called on the system fallback page, which is never single-font.
-        ASSERT(hasPerGlyphFontData());
-        for (size_t i = 0; i < size; ++i) {
-            if (m_perGlyphFontData[i] == fontData) {
-                m_glyphs[i] = 0;
-                m_perGlyphFontData[i] = 0;
-            }
-        }
-    }
-
-    GlyphPageTreeNode* owner() const { return m_owner; }
-
-    // Implemented by the platform.
-    bool fill(unsigned offset, unsigned length, UChar* characterBuffer, unsigned bufferLength, const SimpleFontData*);
-
-private:
-    explicit GlyphPage(GlyphPageTreeNode* owner, const SimpleFontData* fontDataForAllGlyphs = 0)
-        : m_fontDataForAllGlyphs(fontDataForAllGlyphs)
-        , m_owner(owner)
-    {
-        memset(m_glyphs, 0, sizeof(m_glyphs));
-        if (hasPerGlyphFontData())
-            memset(m_perGlyphFontData, 0, sizeof(SimpleFontData*) * GlyphPage::size);
-    }
-
-    bool hasPerGlyphFontData() const { return !m_fontDataForAllGlyphs; }
-
-    const SimpleFontData* m_fontDataForAllGlyphs;
-    GlyphPageTreeNode* m_owner;
-    Glyph m_glyphs[size];
-
-    // NOTE: This array has (GlyphPage::size) elements if m_fontDataForAllGlyphs is null.
-    const SimpleFontData* m_perGlyphFontData[0];
-};
-
-#if COMPILER(MSVC)
-#pragma warning(pop)
-#endif
-
-} // namespace WebCore
-
-#endif // GlyphPage_h