1 /*
2 * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 * its contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "config.h"
30 #include "SimpleFontData.h"
31
32 #include "Font.h"
33 #include "FontCache.h"
34 #include "FloatRect.h"
35 #include "FontDescription.h"
36 #include "PlatformString.h"
37 #include <ApplicationServices/ApplicationServices.h>
38 #include <WebKitSystemInterface/WebKitSystemInterface.h>
39 #include <mlang.h>
40 #include <unicode/uchar.h>
41 #include <unicode/unorm.h>
42 #include <winsock2.h>
43 #include <wtf/MathExtras.h>
44 #include <wtf/RetainPtr.h>
45
46 namespace WebCore {
47
48 using std::max;
49
scaleEmToUnits(float x,unsigned unitsPerEm)50 static inline float scaleEmToUnits(float x, unsigned unitsPerEm) { return unitsPerEm ? x / static_cast<float>(unitsPerEm) : x; }
51
platformInit()52 void SimpleFontData::platformInit()
53 {
54 m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f;
55 m_scriptCache = 0;
56 m_scriptFontProperties = 0;
57 m_isSystemFont = false;
58
59 if (m_platformData.useGDI())
60 return initGDIFont();
61
62 CGFontRef font = m_platformData.cgFont();
63 int iAscent = CGFontGetAscent(font);
64 int iDescent = CGFontGetDescent(font);
65 int iLineGap = CGFontGetLeading(font);
66 unsigned unitsPerEm = CGFontGetUnitsPerEm(font);
67 float pointSize = m_platformData.size();
68 float fAscent = scaleEmToUnits(iAscent, unitsPerEm) * pointSize;
69 float fDescent = -scaleEmToUnits(iDescent, unitsPerEm) * pointSize;
70 float fLineGap = scaleEmToUnits(iLineGap, unitsPerEm) * pointSize;
71
72 if (!isCustomFont()) {
73 HDC dc = GetDC(0);
74 HGDIOBJ oldFont = SelectObject(dc, m_platformData.hfont());
75 int faceLength = GetTextFace(dc, 0, 0);
76 Vector<WCHAR> faceName(faceLength);
77 GetTextFace(dc, faceLength, faceName.data());
78 m_isSystemFont = !wcscmp(faceName.data(), L"Lucida Grande");
79 SelectObject(dc, oldFont);
80 ReleaseDC(0, dc);
81
82 if (shouldApplyMacAscentHack()) {
83 // This code comes from FontDataMac.mm. We only ever do this when running regression tests so that our metrics will match Mac.
84
85 // We need to adjust Times, Helvetica, and Courier to closely match the
86 // vertical metrics of their Microsoft counterparts that are the de facto
87 // web standard. The AppKit adjustment of 20% is too big and is
88 // incorrectly added to line spacing, so we use a 15% adjustment instead
89 // and add it to the ascent.
90 if (!wcscmp(faceName.data(), L"Times") || !wcscmp(faceName.data(), L"Helvetica") || !wcscmp(faceName.data(), L"Courier"))
91 fAscent += floorf(((fAscent + fDescent) * 0.15f) + 0.5f);
92 }
93 }
94
95 m_fontMetrics.setAscent(fAscent);
96 m_fontMetrics.setDescent(fDescent);
97 m_fontMetrics.setLineGap(fLineGap);
98 m_fontMetrics.setLineSpacing(lroundf(fAscent) + lroundf(fDescent) + lroundf(fLineGap));
99
100 GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
101 Glyph xGlyph = glyphPageZero ? glyphPageZero->glyphDataForCharacter('x').glyph : 0;
102 if (xGlyph) {
103 // Measure the actual character "x", since it's possible for it to extend below the baseline, and we need the
104 // reported x-height to only include the portion of the glyph that is above the baseline.
105 CGRect xBox;
106 CGFontGetGlyphBBoxes(font, &xGlyph, 1, &xBox);
107 m_fontMetrics.setXHeight(scaleEmToUnits(CGRectGetMaxY(xBox), unitsPerEm) * pointSize);
108 } else {
109 int iXHeight = CGFontGetXHeight(font);
110 m_fontMetrics.setXHeight(scaleEmToUnits(iXHeight, unitsPerEm) * pointSize);
111 }
112
113 m_fontMetrics.setUnitsPerEm(unitsPerEm);
114 }
115
platformCharWidthInit()116 void SimpleFontData::platformCharWidthInit()
117 {
118 // GDI Fonts init charwidths in initGDIFont.
119 if (!m_platformData.useGDI()) {
120 m_avgCharWidth = 0.f;
121 m_maxCharWidth = 0.f;
122 initCharWidths();
123 }
124 }
platformBoundsForGlyph(Glyph glyph) const125 FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const
126 {
127 if (m_platformData.useGDI())
128 return boundsForGDIGlyph(glyph);
129
130 CGRect box;
131 CGFontGetGlyphBBoxes(m_platformData.cgFont(), &glyph, 1, &box);
132 float pointSize = m_platformData.size();
133 CGFloat scale = pointSize / fontMetrics().unitsPerEm();
134 FloatRect boundingBox = CGRectApplyAffineTransform(box, CGAffineTransformMakeScale(scale, -scale));
135 if (m_syntheticBoldOffset)
136 boundingBox.setWidth(boundingBox.width() + m_syntheticBoldOffset);
137
138 return boundingBox;
139 }
140
platformWidthForGlyph(Glyph glyph) const141 float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
142 {
143 if (m_platformData.useGDI())
144 return widthForGDIGlyph(glyph);
145
146 CGFontRef font = m_platformData.cgFont();
147 float pointSize = m_platformData.size();
148 CGSize advance;
149 CGAffineTransform m = CGAffineTransformMakeScale(pointSize, pointSize);
150
151 // FIXME: Need to add real support for printer fonts.
152 bool isPrinterFont = false;
153 wkGetGlyphAdvances(font, m, m_isSystemFont, isPrinterFont, glyph, advance);
154
155 return advance.width + m_syntheticBoldOffset;
156 }
157
158 }
159