gecko-dev/gfx/thebes/gfxGDIFont.h

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Foundation code.
 *
 * The Initial Developer of the Original Code is Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2005-2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Stuart Parmenter <stuart@mozilla.com>
 *   Masayuki Nakano <masayuki@d-toybox.com>
 *   John Daggett <jdaggett@mozilla.com>
 *   Jonathan Kew <jfkthame@gmail.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef GFX_GDIFONT_H
#define GFX_GDIFONT_H

#include "gfxFont.h"
#include "gfxGDIFontList.h"

#include "nsDataHashtable.h"
#include "nsHashKeys.h"

#include "cairo.h"

class gfxGDIFont : public gfxFont
{
public:
    gfxGDIFont(GDIFontEntry *aFontEntry,
               const gfxFontStyle *aFontStyle,
               PRBool aNeedsBold,
               AntialiasOption anAAOption = kAntialiasDefault);

    virtual ~gfxGDIFont();

    HFONT GetHFONT() { if (!mMetrics) Initialize(); return mFont; }

    gfxFloat GetAdjustedSize() const { return mAdjustedSize; }

    cairo_font_face_t   *CairoFontFace() { return mFontFace; }
    cairo_scaled_font_t *CairoScaledFont() { return mScaledFont; }

    /* overrides for the pure virtual methods in gfxFont */
    virtual const gfxFont::Metrics& GetMetrics();

    virtual PRUint32 GetSpaceGlyph();

    virtual PRBool SetupCairoFont(gfxContext *aContext);

    /* required for MathML to suppress effects of ClearType "padding" */
    virtual gfxFont* CopyWithAntialiasOption(AntialiasOption anAAOption);

    /* override to check for uniscribe failure and fall back to GDI */
    virtual PRBool InitTextRun(gfxContext *aContext,
                               gfxTextRun *aTextRun,
                               const PRUnichar *aString,
                               PRUint32 aRunStart,
                               PRUint32 aRunLength,
                               PRInt32 aRunScript);

    virtual PRBool ProvidesHintedWidths() const { return PR_TRUE; }

    // get hinted glyph width in pixels as 16.16 fixed-point value
    virtual PRInt32 GetHintedGlyphWidth(gfxContext *aCtx, PRUint16 aGID);

protected:
    virtual void CreatePlatformShaper();

    void Initialize(); // creates metrics and Cairo fonts

    void FillLogFont(LOGFONTW& aLogFont, gfxFloat aSize);

    // mPlatformShaper is used for the GDI shaper, mUniscribeShaper
    // for the Uniscribe version if needed
    nsAutoPtr<gfxFontShaper>   mUniscribeShaper;

    HFONT                 mFont;
    cairo_font_face_t    *mFontFace;
    cairo_scaled_font_t  *mScaledFont;

    Metrics              *mMetrics;
    PRUint32              mSpaceGlyph;

    PRBool                mNeedsBold;

    // cache of glyph widths in 16.16 fixed-point pixels
    nsDataHashtable<nsUint32HashKey,PRInt32>    mGlyphWidths;
};

#endif /* GFX_GDIFONT_H */