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
|
/*
* Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "SimpleFontData.h"
#include <winsock2.h>
#include "Font.h"
#include "FontCache.h"
#include "FloatRect.h"
#include "FontDescription.h"
#include <wtf/MathExtras.h>
#include <unicode/uchar.h>
#include <unicode/unorm.h>
#include <ApplicationServices/ApplicationServices.h>
#include <WebKitSystemInterface/WebKitSystemInterface.h>
#include <mlang.h>
#include <tchar.h>
namespace WebCore {
using std::max;
static inline float scaleEmToUnits(float x, unsigned unitsPerEm) { return unitsPerEm ? x / static_cast<float>(unitsPerEm) : x; }
void SimpleFontData::platformInit()
{
m_syntheticBoldOffset = m_font.syntheticBold() ? 1.0f : 0.f;
m_scriptCache = 0;
m_scriptFontProperties = 0;
m_isSystemFont = false;
if (m_font.useGDI()) {
HDC hdc = GetDC(0);
HGDIOBJ oldFont = SelectObject(hdc, m_font.hfont());
OUTLINETEXTMETRIC metrics;
GetOutlineTextMetrics(hdc, sizeof(metrics), &metrics);
TEXTMETRIC& textMetrics = metrics.otmTextMetrics;
m_ascent = textMetrics.tmAscent;
m_descent = textMetrics.tmDescent;
m_lineGap = textMetrics.tmExternalLeading;
m_lineSpacing = m_ascent + m_descent + m_lineGap;
m_xHeight = m_ascent * 0.56f; // Best guess for xHeight if no x glyph is present.
GLYPHMETRICS gm;
MAT2 mat = { 1, 0, 0, 1 };
DWORD len = GetGlyphOutline(hdc, 'x', GGO_METRICS, &gm, 0, 0, &mat);
if (len != GDI_ERROR && gm.gmptGlyphOrigin.y > 0)
m_xHeight = gm.gmptGlyphOrigin.y;
m_unitsPerEm = metrics.otmEMSquare;
SelectObject(hdc, oldFont);
ReleaseDC(0, hdc);
return;
}
CGFontRef font = m_font.cgFont();
int iAscent = CGFontGetAscent(font);
int iDescent = CGFontGetDescent(font);
int iLineGap = CGFontGetLeading(font);
m_unitsPerEm = CGFontGetUnitsPerEm(font);
float pointSize = m_font.size();
float fAscent = scaleEmToUnits(iAscent, m_unitsPerEm) * pointSize;
float fDescent = -scaleEmToUnits(iDescent, m_unitsPerEm) * pointSize;
float fLineGap = scaleEmToUnits(iLineGap, m_unitsPerEm) * pointSize;
if (!isCustomFont()) {
HDC dc = GetDC(0);
HGDIOBJ oldFont = SelectObject(dc, m_font.hfont());
int faceLength = GetTextFace(dc, 0, 0);
Vector<TCHAR> faceName(faceLength);
GetTextFace(dc, faceLength, faceName.data());
m_isSystemFont = !_tcscmp(faceName.data(), _T("Lucida Grande"));
SelectObject(dc, oldFont);
ReleaseDC(0, dc);
if (shouldApplyMacAscentHack()) {
// This code comes from FontDataMac.mm. We only ever do this when running regression tests so that our metrics will match Mac.
// We need to adjust Times, Helvetica, and Courier to closely match the
// vertical metrics of their Microsoft counterparts that are the de facto
// web standard. The AppKit adjustment of 20% is too big and is
// incorrectly added to line spacing, so we use a 15% adjustment instead
// and add it to the ascent.
if (!_tcscmp(faceName.data(), _T("Times")) || !_tcscmp(faceName.data(), _T("Helvetica")) || !_tcscmp(faceName.data(), _T("Courier")))
fAscent += floorf(((fAscent + fDescent) * 0.15f) + 0.5f);
}
}
m_ascent = lroundf(fAscent);
m_descent = lroundf(fDescent);
m_lineGap = lroundf(fLineGap);
m_lineSpacing = m_ascent + m_descent + m_lineGap;
// Measure the actual character "x", because AppKit synthesizes X height rather than getting it from the font.
// Unfortunately, NSFont will round this for us so we don't quite get the right value.
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
Glyph xGlyph = glyphPageZero ? glyphPageZero->glyphDataForCharacter('x').glyph : 0;
if (xGlyph) {
CGRect xBox;
CGFontGetGlyphBBoxes(font, &xGlyph, 1, &xBox);
// Use the maximum of either width or height because "x" is nearly square
// and web pages that foolishly use this metric for width will be laid out
// poorly if we return an accurate height. Classic case is Times 13 point,
// which has an "x" that is 7x6 pixels.
m_xHeight = scaleEmToUnits(max(CGRectGetMaxX(xBox), CGRectGetMaxY(xBox)), m_unitsPerEm) * pointSize;
} else {
int iXHeight = CGFontGetXHeight(font);
m_xHeight = scaleEmToUnits(iXHeight, m_unitsPerEm) * pointSize;
}
}
void SimpleFontData::platformDestroy()
{
if (!isCustomFont()) {
DeleteObject(m_font.hfont());
CGFontRelease(m_font.cgFont());
}
// We don't hash this on Win32, so it's effectively owned by us.
delete m_smallCapsFontData;
ScriptFreeCache(&m_scriptCache);
delete m_scriptFontProperties;
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
if (m_font.useGDI()) {
HDC hdc = GetDC(0);
HGDIOBJ oldFont = SelectObject(hdc, m_font.hfont());
int width;
GetCharWidthI(hdc, glyph, 1, 0, &width);
SelectObject(hdc, oldFont);
ReleaseDC(0, hdc);
return width;
}
CGFontRef font = m_font.cgFont();
float pointSize = m_font.size();
CGSize advance;
CGAffineTransform m = CGAffineTransformMakeScale(pointSize, pointSize);
// FIXME: Need to add real support for printer fonts.
bool isPrinterFont = false;
wkGetGlyphAdvances(font, m, m_isSystemFont, isPrinterFont, glyph, advance);
return advance.width + m_syntheticBoldOffset;
}
}
|