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/*
* Copyright (c) 2006, 2007, 2008, 2009, Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 UniscribeHelperTextRun_h
#define UniscribeHelperTextRun_h
#include "UniscribeHelper.h"
namespace WebCore {
class Font;
class TextRun;
// Wrapper around the Uniscribe helper that automatically sets it up with the
// WebKit types we supply.
class UniscribeHelperTextRun : public UniscribeHelper {
public:
// Regular constructor used for WebCore text run processing.
UniscribeHelperTextRun(const TextRun&, const Font&);
// Constructor with the same interface as the gfx::UniscribeState. Using
// this constructor will not give you font fallback, but it will provide
// the ability to load fonts that may not be in the OS cache
// ("TryToPreloadFont") if the caller does not have a TextRun/Font.
UniscribeHelperTextRun(const wchar_t* input,
int inputLength,
bool isRtl,
HFONT hfont,
SCRIPT_CACHE*,
SCRIPT_FONTPROPERTIES*);
protected:
virtual void tryToPreloadFont(HFONT);
private:
// This function retrieves the Windows font data (HFONT, etc) for the next
// WebKit font in the list. If the font data corresponding to font_index_
// has been obtained before, returns the values stored in our internal
// vectors (hfonts_, etc). Otherwise, it gets next SimpleFontData from
// WebKit and adds them to in hfonts_ and friends so that font data can be
// returned quickly next time they're requested.
virtual bool nextWinFontData(HFONT*, SCRIPT_CACHE**, SCRIPT_FONTPROPERTIES**, int* ascent);
virtual void resetFontIndex();
// Reference to WebKit::Font that contains all the information about fonts
// we can use to render this input run of text. It is used in
// NextWinFontData to retrieve Windows font data for a series of
// non-primary fonts.
//
// This pointer can be NULL for no font fallback handling.
const Font* m_font;
// It's rare that many fonts are listed in stylesheets.
// Four would be large enough in most cases.
const static size_t kNumberOfFonts = 4;
// These vectors are used to store Windows font data for non-primary fonts.
Vector<HFONT, kNumberOfFonts> m_hfonts;
Vector<SCRIPT_CACHE*, kNumberOfFonts> m_scriptCaches;
Vector<SCRIPT_FONTPROPERTIES*, kNumberOfFonts> m_fontProperties;
Vector<int, kNumberOfFonts> m_ascents;
// Index of the fallback font we're currently using for NextWinFontData.
int m_fontIndex;
};
} // namespace WebCore
#endif // UniscribeHelperTextRun_h
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