gecko/gfx/thebes/public/gfxAtsuiFonts.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 thebes gfx code.
 *
 * The Initial Developer of the Original Code is Mozilla Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Vladimir Vukicevic <vladimir@pobox.com>
 *   Masayuki Nakano <masayuki@d-toybox.com>
 *   John Daggett <jdaggett@mozilla.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_ATSUIFONTS_H
#define GFX_ATSUIFONTS_H

#include "cairo.h"
#include "gfxTypes.h"
#include "gfxFont.h"
#include "gfxFontUtils.h"

#include <Carbon/Carbon.h>

class gfxAtsuiFontGroup;

class MacOSFontEntry;

class gfxAtsuiFont : public gfxFont {
public:

    gfxAtsuiFont(MacOSFontEntry *aFontEntry,
                 const gfxFontStyle *fontStyle);

    virtual ~gfxAtsuiFont();

    virtual const gfxFont::Metrics& GetMetrics();

    float GetCharWidth(PRUnichar c, PRUint32 *aGlyphID = nsnull);
    float GetCharHeight(PRUnichar c);

    ATSUFontID GetATSUFontID();

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

    ATSUStyle GetATSUStyle() { return mATSUStyle; }

    virtual nsString GetUniqueName();

    virtual PRUint32 GetSpaceGlyph() { return mSpaceGlyph; }
    
    PRBool HasMirroringInfo();

    virtual void SetupGlyphExtents(gfxContext *aContext, PRUint32 aGlyphID,
            PRBool aNeedTight, gfxGlyphExtents *aExtents);

    PRBool TestCharacterMap(PRUint32 aCh);

protected:
    const gfxFontStyle *mFontStyle;

    ATSUStyle mATSUStyle;

    nsRefPtr<MacOSFontEntry> mFontEntry;

    PRBool mHasMirroring;
    PRBool mHasMirroringLookedUp;

    nsString mUniqueName;

    cairo_font_face_t *mFontFace;
    cairo_scaled_font_t *mScaledFont;

    gfxFont::Metrics mMetrics;

    gfxFloat mAdjustedSize;
    PRUint32 mSpaceGlyph;    

    void InitMetrics(ATSUFontID aFontID, ATSFontRef aFontRef);

    virtual PRBool SetupCairoFont(gfxContext *aContext);
};

class THEBES_API gfxAtsuiFontGroup : public gfxFontGroup {
public:
    gfxAtsuiFontGroup(const nsAString& families,
                      const gfxFontStyle *aStyle);
    virtual ~gfxAtsuiFontGroup() {};

    virtual gfxFontGroup *Copy(const gfxFontStyle *aStyle);

    virtual gfxTextRun *MakeTextRun(const PRUnichar* aString, PRUint32 aLength,
                                    const Parameters* aParams, PRUint32 aFlags);
    virtual gfxTextRun *MakeTextRun(const PRUint8* aString, PRUint32 aLength,
                                    const Parameters* aParams, PRUint32 aFlags);
    // When aWrapped is true, the string includes bidi control
    // characters. The first character will be LRO or LRO to force setting the
    // direction for all characters, the last character is PDF, and the
    // second to last character is a non-whitespace character --- to ensure
    // that there is no "trailing whitespace" in the string, see
    // http://weblogs.mozillazine.org/roc/archives/2007/02/superlaser_targ.html#comments
    void MakeTextRunInternal(const PRUnichar *aString, PRUint32 aLength,
                             PRBool aWrapped, gfxTextRun *aTextRun);

    gfxAtsuiFont* GetFontAt(PRInt32 aFontIndex) {
        return static_cast<gfxAtsuiFont*>(static_cast<gfxFont*>(mFonts[aFontIndex]));
    }

    PRBool HasFont(ATSUFontID fid);

    inline gfxAtsuiFont* WhichFontSupportsChar(nsTArray< nsRefPtr<gfxFont> >& aFontList, PRUint32 aCh) {
        PRUint32 len = aFontList.Length();
        for (PRUint32 i = 0; i < len; i++) {
            gfxAtsuiFont* font = static_cast<gfxAtsuiFont*>(aFontList.ElementAt(i).get());
            if (font->TestCharacterMap(aCh))
                return font;
        }
        return nsnull;
    }

   // search through pref fonts for a character, return nsnull if no matching pref font
   already_AddRefed<gfxAtsuiFont> WhichPrefFontSupportsChar(PRUint32 aCh);
   
   already_AddRefed<gfxAtsuiFont> FindFontForChar(PRUint32 aCh, PRUint32 aPrevCh, PRUint32 aNextCh, gfxAtsuiFont* aPrevMatchedFont);

protected:
    static PRBool FindATSUFont(const nsAString& aName,
                               const nsACString& aGenericName,
                               void *closure);

    PRUint32 GuessMaximumStringLength();

    /** Returns true for success */
    PRBool InitTextRun(gfxTextRun *aRun, const PRUnichar *aString, PRUint32 aLength,
                       PRBool aWrapped, PRUint32 aSegmentStart, PRUint32 aSegmentLength);

};
#endif /* GFX_ATSUIFONTS_H */