This file is indexed.

/usr/include/firefox/nsFontMetrics.h is in firefox-dev 11.0+build1-0ubuntu4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
/* -*- 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.org code.
 *
 * The Initial Developer of the Original Code is
 * mozilla.org.
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Stuart Parmenter <pavlov@pavlov.net>
 *
 * 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 NSFONTMETRICS__H__
#define NSFONTMETRICS__H__

#include "nsCOMPtr.h"
#include "nsCoord.h"
#include "nsFont.h"
#include "gfxFont.h"

class nsIAtom;
class nsDeviceContext;
class nsRenderingContext;
struct nsBoundingMetrics;

/**
 * Font metrics
 *
 * This class may be somewhat misnamed. A better name might be
 * nsFontList. The style system uses the nsFont struct for various
 * font properties, one of which is font-family, which can contain a
 * *list* of font names. The nsFont struct is "realized" by asking the
 * device context to cough up an nsFontMetrics object, which contains
 * a list of real font handles, one for each font mentioned in
 * font-family (and for each fallback when we fall off the end of that
 * list).
 *
 * The style system needs to have access to certain metrics, such as
 * the em height (for the CSS "em" unit), and we use the first Western
 * font's metrics for that purpose. The platform-specific
 * implementations are expected to select non-Western fonts that "fit"
 * reasonably well with the Western font that is loaded at Init time.
 */
class nsFontMetrics
{
public:
    nsFontMetrics();
    ~nsFontMetrics();

    NS_INLINE_DECL_REFCOUNTING(nsFontMetrics)

    /**
     * Initialize the font metrics. Call this after creating the font metrics.
     * Font metrics you get from the font cache do NOT need to be initialized
     *
     * @see nsDeviceContext#GetMetricsFor()
     */
    nsresult Init(const nsFont& aFont, nsIAtom* aLanguage,
                  nsDeviceContext *aContext,
                  gfxUserFontSet *aUserFontSet = nsnull);

    /**
     * Destroy this font metrics. This breaks the association between
     * the font metrics and the device context.
     */
    void Destroy();

    /**
     * Return the font's x-height.
     */
    nscoord XHeight();

    /**
     * Return the font's superscript offset (the distance from the
     * baseline to where a superscript's baseline should be placed).
     * The value returned will be positive.
     */
    nscoord SuperscriptOffset();

    /**
     * Return the font's subscript offset (the distance from the
     * baseline to where a subscript's baseline should be placed).
     * The value returned will be positive.
     */
    nscoord SubscriptOffset();

    /**
     * Return the font's strikeout offset (the distance from the
     * baseline to where a strikeout should be placed) and size.
     * Positive values are above the baseline, negative below.
     */
    void GetStrikeout(nscoord& aOffset, nscoord& aSize);

    /**
     * Return the font's underline offset (the distance from the
     * baseline to where a underline should be placed) and size.
     * Positive values are above the baseline, negative below.
     */
    void GetUnderline(nscoord& aOffset, nscoord& aSize);

    /**
     * Returns the amount of internal leading for the font.
     * This is normally the difference between the max ascent
     * and the em ascent.
     */
    nscoord InternalLeading();

    /**
     * Returns the amount of external leading for the font.
     * em ascent(?) plus external leading is the font designer's
     * recommended line-height for this font.
     */
    nscoord ExternalLeading();

    /**
     * Returns the height of the em square.
     * This is em ascent plus em descent.
     */
    nscoord EmHeight();

    /**
     * Returns the ascent part of the em square.
     */
    nscoord EmAscent();

    /**
     * Returns the descent part of the em square.
     */
    nscoord EmDescent();

    /**
     * Returns the height of the bounding box.
     * This is max ascent plus max descent.
     */
    nscoord MaxHeight();

    /**
     * Returns the maximum distance characters in this font extend
     * above the base line.
     */
    nscoord MaxAscent();

    /**
     * Returns the maximum distance characters in this font extend
     * below the base line.
     */
    nscoord MaxDescent();

    /**
     * Returns the maximum character advance for the font.
     */
    nscoord MaxAdvance();

    /**
     * Returns the average character width
     */
    nscoord AveCharWidth();

    /**
     * Returns the often needed width of the space character
     */
    nscoord SpaceWidth();

    /**
     * Returns the font associated with these metrics. The return value
     * is only defined after Init() has been called.
     */
    const nsFont &Font() { return mFont; }

    /**
     * Returns the language associated with these metrics
     */
    nsIAtom* Language() { return mLanguage; }

    PRInt32 GetMaxStringLength();

    // Get the width for this string.  aWidth will be updated with the
    // width in points, not twips.  Callers must convert it if they
    // want it in another format.
    nscoord GetWidth(const char* aString, PRUint32 aLength,
                     nsRenderingContext *aContext);
    nscoord GetWidth(const PRUnichar* aString, PRUint32 aLength,
                     nsRenderingContext *aContext);

    // Draw a string using this font handle on the surface passed in.
    void DrawString(const char *aString, PRUint32 aLength,
                    nscoord aX, nscoord aY,
                    nsRenderingContext *aContext);
    void DrawString(const PRUnichar* aString, PRUint32 aLength,
                    nscoord aX, nscoord aY,
                    nsRenderingContext *aContext,
                    nsRenderingContext *aTextRunConstructionContext);

    nsBoundingMetrics GetBoundingMetrics(const PRUnichar *aString,
                                         PRUint32 aLength,
                                         nsRenderingContext *aContext);

    void SetTextRunRTL(bool aIsRTL) { mTextRunRTL = aIsRTL; }
    bool GetTextRunRTL() { return mTextRunRTL; }

    gfxFontGroup* GetThebesFontGroup() { return mFontGroup; }
    gfxUserFontSet* GetUserFontSet() { return mFontGroup->GetUserFontSet(); }

    PRUint32 AppUnitsPerDevPixel() { return mP2A; }

protected:
    const gfxFont::Metrics& GetMetrics() const;

    nsFont mFont;
    nsRefPtr<gfxFontGroup> mFontGroup;
    nsCOMPtr<nsIAtom> mLanguage;
    nsDeviceContext *mDeviceContext;
    PRUint32 mP2A;
    bool mTextRunRTL;
};

#endif /* NSFONTMETRICS__H__ */