DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Untracked file

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201
/* -*- 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
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Vladimir Vukicevic <vladimir@mozilla.com>
 *   Masayuki Nakano <masayuki@d-toybox.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_PANGOFONTS_H
#define GFX_PANGOFONTS_H

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

#include <pango/pango.h>

// Control when we bypass Pango
// Enable this to use FreeType to glyph-convert 8bit-only textruns, but use Pango
// to shape any textruns with non-8bit characters
// XXX
#define ENABLE_FAST_PATH_8BIT
// Enable this to bypass Pango shaping for all textruns.  Don't expect
// anything other than simple Latin work though!
//#define ENABLE_FAST_PATH_ALWAYS

#include "nsDataHashtable.h"
#include "nsClassHashtable.h"

class gfxPangoTextRun;

class gfxPangoFont : public gfxFont {
public:
    gfxPangoFont (const nsAString& aName,
                  const gfxFontStyle *aFontStyle);
    virtual ~gfxPangoFont ();
    static already_AddRefed<gfxPangoFont> GetOrMakeFont(PangoFont *aPangoFont);

    static void Shutdown();

    virtual const gfxFont::Metrics& GetMetrics();

    PangoFont *GetPangoFont() { if (!mPangoFont) RealizePangoFont(); return mPangoFont; }

    // Check GetStyle()->sizeAdjust != 0.0 before calling this 
    gfxFloat GetAdjustedSize() { if (!mPangoFont) RealizePangoFont(); return mAdjustedSize; }

    PRUint32 GetGlyph(const PRUint32 aChar);

    virtual nsString GetUniqueName();

    // Get the glyphID of a space
    virtual PRUint32 GetSpaceGlyph() {
        NS_ASSERTION(GetStyle()->size != 0,
                     "forgot to short-circuit a text run with zero-sized font?");
        GetMetrics();
        return mSpaceGlyph;
    }

protected:
    PangoFont *mPangoFont;
    cairo_scaled_font_t *mCairoFont;

    PRBool   mHasMetrics;
    PRUint32 mSpaceGlyph;
    Metrics  mMetrics;
    gfxFloat mAdjustedSize;

    gfxPangoFont(PangoFont *aPangoFont, const nsAString &aName,
                 const gfxFontStyle *aFontStyle);
    void RealizePangoFont();
    void GetCharSize(const char aChar, gfxSize& aInkSize, gfxSize& aLogSize,
                     PRUint32 *aGlyphID = nsnull);

    virtual PRBool SetupCairoFont(gfxContext *aContext);
};

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

    virtual gfxFontGroup *Copy(const gfxFontStyle *aStyle);

    // Create and initialize a textrun using Pango
    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);

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

protected:
    // ****** Textrun glyph conversion helpers ******

    /**
     * Fill in the glyph-runs for the textrun.
     * @param aTake8BitPath the text contains only characters below 0x100
     * (TEXT_IS_8BIT can return false when the characters are all below 0x100
     * but stored in UTF16 format)
     */
    void InitTextRun(gfxTextRun *aTextRun, const gchar *aUTF8Text,
                     PRUint32 aUTF8Length, PRUint32 aUTF8HeaderLength,
                     PRBool aTake8BitPath);

    // Returns NS_ERROR_FAILURE if there's a missing glyph
    nsresult SetGlyphs(gfxTextRun *aTextRun, gfxPangoFont *aFont,
                       const gchar *aUTF8, PRUint32 aUTF8Length,
                       PRUint32 *aUTF16Offset, PangoGlyphString *aGlyphs,
                       PangoGlyphUnit aOverrideSpaceWidth,
                       PRBool aAbortOnMissingGlyph);
    nsresult SetMissingGlyphs(gfxTextRun *aTextRun,
                              const gchar *aUTF8, PRUint32 aUTF8Length,
                              PRUint32 *aUTF16Offset);
    void CreateGlyphRunsItemizing(gfxTextRun *aTextRun,
                                  const gchar *aUTF8, PRUint32 aUTF8Length,
                                  PRUint32 aUTF8HeaderLength);
#if defined(ENABLE_FAST_PATH_8BIT) || defined(ENABLE_FAST_PATH_ALWAYS)
    PRBool CanTakeFastPath(PRUint32 aFlags);
    nsresult CreateGlyphRunsFast(gfxTextRun *aTextRun,
                                 const gchar *aUTF8, PRUint32 aUTF8Length);
#endif

    static PRBool FontCallback (const nsAString& fontName,
                                const nsACString& genericName,
                                void *closure);
};

class gfxPangoFontWrapper {
public:
    gfxPangoFontWrapper(PangoFont *aFont) {
        mFont = aFont;
        g_object_ref(mFont);
    }
    ~gfxPangoFontWrapper() {
        if (mFont)
            g_object_unref(mFont);
    }
    PangoFont* Get() { return mFont; }
private:
    PangoFont *mFont;
};

class gfxPangoFontCache
{
public:
    gfxPangoFontCache();
    ~gfxPangoFontCache();

    static gfxPangoFontCache* GetPangoFontCache() {
        if (!sPangoFontCache)
            sPangoFontCache = new gfxPangoFontCache();
        return sPangoFontCache;
    }
    static void Shutdown() {
        if (sPangoFontCache)
            delete sPangoFontCache;
        sPangoFontCache = nsnull;
    }

    void Put(const PangoFontDescription *aFontDesc, PangoFont *aPangoFont);
    PangoFont* Get(const PangoFontDescription *aFontDesc);
private:
    static gfxPangoFontCache *sPangoFontCache;
    nsClassHashtable<nsUint32HashKey,  gfxPangoFontWrapper> mPangoFonts;
};

#endif /* GFX_PANGOFONTS_H */