author John Daggett <>
Fri, 25 Jun 2010 21:43:10 +0900
changeset 46221 31c52b96e75e01c116a24df7e34555374e3e8c20
parent 43527 e76d7213680c8ad63ef167e827b9aa969660be80
permissions -rw-r--r--
Bug 561304. Use GDI shaper by default on XP and handle bitmap fonts better. r=jkew

/* -*- 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
 * 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 <>
 *   Masayuki Nakano <>
 *   John Daggett <>
 *   Jonathan Kew <>
 * 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
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 * and other provisions required by the GPL or the LGPL. If you do not delete
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 * ***** END LICENSE BLOCK ***** */


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

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

#include "cairo.h"

class gfxGDIFont : public gfxFont
    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);

    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 */