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/*
* Copyright (C) 2006 Apple Computer, Inc. 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 GlyphWidthMap_h
#define GlyphWidthMap_h
#include <wtf/unicode/Unicode.h>
#include <wtf/Noncopyable.h>
#include <wtf/HashMap.h>
namespace WebCore {
typedef unsigned short Glyph;
const float cGlyphWidthUnknown = -1;
class GlyphWidthMap : Noncopyable {
public:
GlyphWidthMap() : m_filledPrimaryPage(false), m_pages(0) {}
~GlyphWidthMap() { if (m_pages) { deleteAllValues(*m_pages); delete m_pages; } }
float widthForGlyph(Glyph);
void setWidthForGlyph(Glyph, float);
private:
struct GlyphWidthPage {
static const size_t size = 256; // Usually covers Latin-1 in a single page.
float m_widths[size];
float widthForGlyph(Glyph g) const { return m_widths[g % size]; }
void setWidthForGlyph(Glyph g, float w)
{
setWidthForIndex(g % size, w);
}
void setWidthForIndex(unsigned index, float w)
{
m_widths[index] = w;
}
};
GlyphWidthPage* locatePage(unsigned page);
bool m_filledPrimaryPage;
GlyphWidthPage m_primaryPage; // We optimize for the page that contains glyph indices 0-255.
HashMap<int, GlyphWidthPage*>* m_pages;
};
}
#endif
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