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
|
/*
* Copyright (C) 2003, 2006, 2008, 2011 Apple Inc. All rights reserved.
* Copyright (C) 2008 Holger Hans Peter Freyther
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef WidthIterator_h
#define WidthIterator_h
#include <wtf/HashSet.h>
#include <wtf/unicode/Unicode.h>
namespace WebCore {
class Font;
class GlyphBuffer;
class SimpleFontData;
class TextRun;
struct WidthIterator {
WidthIterator(const Font*, const TextRun&, HashSet<const SimpleFontData*>* fallbackFonts = 0, bool accountForGlyphBounds = false, bool forTextEmphasis = false);
void advance(int to, GlyphBuffer* = 0);
bool advanceOneCharacter(float& width, GlyphBuffer* = 0);
float maxGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_maxGlyphBoundingBoxY; }
float minGlyphBoundingBoxY() const { ASSERT(m_accountForGlyphBounds); return m_minGlyphBoundingBoxY; }
float firstGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_firstGlyphOverflow; }
float lastGlyphOverflow() const { ASSERT(m_accountForGlyphBounds); return m_lastGlyphOverflow; }
const Font* m_font;
const TextRun& m_run;
int m_end;
unsigned m_currentCharacter;
float m_runWidthSoFar;
float m_expansion;
float m_expansionPerOpportunity;
bool m_isAfterExpansion;
private:
UChar32 normalizeVoicingMarks(int currentCharacter);
HashSet<const SimpleFontData*>* m_fallbackFonts;
bool m_accountForGlyphBounds;
float m_maxGlyphBoundingBoxY;
float m_minGlyphBoundingBoxY;
float m_firstGlyphOverflow;
float m_lastGlyphOverflow;
bool m_forTextEmphasis;
};
}
#endif
|
