Home | History | Annotate | Download | only in fonts 
      1 /*
      2  * Copyright (C) 2006, 2009, 2011 Apple Inc. All rights reserved.
      3  * Copyright (C) 2007-2008 Torch Mobile Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *
      9  * 1.  Redistributions of source code must retain the above copyright
     10  *     notice, this list of conditions and the following disclaimer.
     11  * 2.  Redistributions in binary form must reproduce the above copyright
     12  *     notice, this list of conditions and the following disclaimer in the
     13  *     documentation and/or other materials provided with the distribution.
     14  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     15  *     its contributors may be used to endorse or promote products derived
     16  *     from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     21  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #ifndef GlyphBuffer_h
     31 #define GlyphBuffer_h
     32 
     33 #include "platform/fonts/Glyph.h"
     34 #include "platform/geometry/FloatSize.h"
     35 #include "platform/heap/Heap.h"
     36 #include "wtf/Vector.h"
     37 
     38 namespace blink {
     39 
     40 class SimpleFontData;
     41 
     42 class GlyphBuffer {
     43     STACK_ALLOCATED();
     44 public:
     45     GlyphBuffer() : m_hasVerticalAdvances(false) { }
     46 
     47     bool isEmpty() const { return m_fontData.isEmpty(); }
     48     unsigned size() const { return m_fontData.size(); }
     49     bool hasVerticalAdvances() const { return m_hasVerticalAdvances; }
     50 
     51     void clear()
     52     {
     53         m_fontData.clear();
     54         m_glyphs.clear();
     55         m_advances.clear();
     56         m_hasVerticalAdvances = false;
     57     }
     58 
     59     const Glyph* glyphs(unsigned from) const { return m_glyphs.data() + from; }
     60     const FloatSize* advances(unsigned from) const { return m_advances.data() + from; }
     61 
     62     const SimpleFontData* fontDataAt(unsigned index) const { return m_fontData[index]; }
     63 
     64     Glyph glyphAt(unsigned index) const
     65     {
     66         return m_glyphs[index];
     67     }
     68 
     69     FloatSize advanceAt(unsigned index) const
     70     {
     71         return m_advances[index];
     72     }
     73 
     74     void add(Glyph glyph, const SimpleFontData* font, float width)
     75     {
     76         m_fontData.append(font);
     77         m_glyphs.append(glyph);
     78         m_advances.append(FloatSize(width, 0));
     79     }
     80 
     81     void add(Glyph glyph, const SimpleFontData* font, const FloatSize& advance)
     82     {
     83         m_fontData.append(font);
     84         m_glyphs.append(glyph);
     85         m_advances.append(advance);
     86         if (advance.height())
     87             m_hasVerticalAdvances = true;
     88     }
     89 
     90     void reverse()
     91     {
     92         m_fontData.reverse();
     93         m_glyphs.reverse();
     94         m_advances.reverse();
     95     }
     96 
     97     void setAdvanceWidth(unsigned index, float newWidth)
     98     {
     99         m_advances[index].setWidth(newWidth);
    100     }
    101 
    102     void expandLastAdvance(float width)
    103     {
    104         ASSERT(!isEmpty());
    105         FloatSize& lastAdvance = m_advances.last();
    106         lastAdvance.setWidth(lastAdvance.width() + width);
    107     }
    108 
    109 private:
    110     Vector<const SimpleFontData*, 2048> m_fontData;
    111     Vector<Glyph, 2048> m_glyphs;
    112     Vector<FloatSize, 2048> m_advances;
    113     bool m_hasVerticalAdvances;
    114 };
    115 
    116 } // namespace blink
    117 
    118 #endif
    119