flutter_flutter/engine/platform/fonts/GlyphBuffer.h

/*
 * Copyright (C) 2006, 2009, 2011 Apple Inc. All rights reserved.
 * Copyright (C) 2007-2008 Torch Mobile Inc.
 *
 * 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
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef SKY_ENGINE_PLATFORM_FONTS_GLYPHBUFFER_H_
#define SKY_ENGINE_PLATFORM_FONTS_GLYPHBUFFER_H_

#include "sky/engine/platform/fonts/Glyph.h"
#include "sky/engine/platform/geometry/FloatSize.h"
#include "sky/engine/wtf/Vector.h"

namespace blink {

class SimpleFontData;

class GlyphBuffer {
public:
    GlyphBuffer() { }

    bool isEmpty() const { return m_fontData.isEmpty(); }
    bool hasOffsets() const { return !m_offsets.isEmpty(); }
    unsigned size() const { return m_fontData.size(); }

    void clear()
    {
        m_fontData.clear();
        m_glyphs.clear();
        m_advances.clear();
        m_offsets.clear();
    }

    const Glyph* glyphs(unsigned from) const { return m_glyphs.data() + from; }
    const float* advances(unsigned from) const { return m_advances.data() + from; }
    const FloatSize* offsets(unsigned from) const { return m_offsets.data() + from; }

    const SimpleFontData* fontDataAt(unsigned index) const { return m_fontData[index]; }

    Glyph glyphAt(unsigned index) const
    {
        return m_glyphs[index];
    }

    float advanceAt(unsigned index) const
    {
        return m_advances[index];
    }

    void add(Glyph glyph, const SimpleFontData* font, float width)
    {
        // should not mix offset/advance-only glyphs
        ASSERT(!hasOffsets());

        m_fontData.append(font);
        m_glyphs.append(glyph);
        m_advances.append(width);
    }

    void add(Glyph glyph, const SimpleFontData* font, const FloatSize& offset, float advance)
    {
        // should not mix offset/advance-only glyphs
        ASSERT(size() == m_offsets.size());

        m_fontData.append(font);
        m_glyphs.append(glyph);
        m_offsets.append(offset);
        m_advances.append(advance);
    }

    void reverse()
    {
        m_fontData.reverse();
        m_glyphs.reverse();
        m_advances.reverse();
    }

    void expandLastAdvance(float width)
    {
        ASSERT(!isEmpty());
        float& lastAdvance = m_advances.last();
        lastAdvance += width;
    }

private:
    Vector<const SimpleFontData*, 2048> m_fontData;
    Vector<Glyph, 2048> m_glyphs;
    Vector<float, 2048> m_advances;
    Vector<FloatSize, 1024> m_offsets;
};

} // namespace blink

#endif  // SKY_ENGINE_PLATFORM_FONTS_GLYPHBUFFER_H_