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) 2006-2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Vladimir Vukicevic <vladimir@pobox.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
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 * 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

#ifndef __LP64__ /* ATSUI not available on 64-bit */

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

#include <Carbon/Carbon.h>

class gfxAtsuiFontGroup;

class MacOSFontEntry;

class gfxAtsuiFont : public gfxFont {
public:

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

    virtual ~gfxAtsuiFont();

    virtual const gfxFont::Metrics& GetMetrics();

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

    ATSFontRef GetATSFontRef();

    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);

    MacOSFontEntry* GetFontEntry();
    PRBool Valid() { return mIsValid; }

protected:
    const gfxFontStyle *mFontStyle;

    ATSUStyle mATSUStyle;

    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,
                      gfxUserFontSet *aUserFontSet);
    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) {
        // If it turns out to be hard for all clients that cache font
        // groups to call UpdateFontList at appropriate times, we could
        // instead consider just calling UpdateFontList from someplace
        // more central (such as here).
        NS_ASSERTION(!mUserFontSet || mCurrGeneration == GetGeneration(),
                     "Whoever was caching this font group should have "
                     "called UpdateFontList on it");

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

    PRBool HasFont(ATSFontRef aFontRef);

    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<gfxFont> WhichPrefFontSupportsChar(PRUint32 aCh);

    already_AddRefed<gfxFont> WhichSystemFontSupportsChar(PRUint32 aCh);

    void UpdateFontList();

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

    PRUint32 GuessMaximumStringLength();

    /**
     * @param aRun the text run to fill in
     * @param aString the complete text including all wrapper characters
     * @param aLength the length of aString
     * @param aLayoutStart the first character of aString that should be
     * at the start of the ATSUI layout; this skips any wrapper character
     * used to override direction
     * @param aLayoutLength the length of the characters that should be
     * in the ATSUI layout; this excludes any trailing wrapper character
     * used to override direction
     * @param aTrailingCharsToIgnore the number of trailing characters
     * in the ATSUI layout that are not part of the text run
     * (characters added to ensure correct RTL and kerning behaviour)
     * @param aTextRunOffset the character offset in the textrun where
     * the glyph data from the ATSUI layout should be copied
     * @return true for success
     */
    PRBool InitTextRun(gfxTextRun *aRun,
                       const PRUnichar *aString, PRUint32 aLength,
                       PRUint32 aLayoutStart, PRUint32 aLayoutLength,
                       PRUint32 aOffsetInTextRun, PRUint32 aLengthInTextRun);

    /**
     * Function to reinitialize our mFonts array and any other data
     * that depends on mFonts.
     */
    void InitFontList();
    
    // cache the most recent pref font to avoid general pref font lookup
    nsRefPtr<gfxFontFamily>       mLastPrefFamily;
    nsRefPtr<gfxAtsuiFont>        mLastPrefFont;
    eFontPrefLang                 mLastPrefLang;       // lang group for last pref font
    PRBool                        mLastPrefFirstFont;  // is this the first font in the list of pref fonts for this lang group?
    eFontPrefLang                 mPageLang;
};

#endif /* not __LP64__ */

#endif /* GFX_ATSUIFONTS_H */