1 /*
2 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
3 * Copyright (C) 2007-2009 Torch Mobile, Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
15 * its contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "config.h"
31 #include "SimpleFontData.h"
32
33 #include "FloatRect.h"
34 #include "Font.h"
35 #include "FontCache.h"
36 #include "FontDescription.h"
37 #include <mlang.h>
38 #include <wtf/MathExtras.h>
39
40 namespace WebCore {
41
42 extern HDC g_screenDC;
43
platformInit()44 void SimpleFontData::platformInit()
45 {
46 if (!m_platformData.isValid())
47 return;
48
49 const TEXTMETRIC& tm = m_platformData.metrics();
50 m_isSystemFont = m_platformData.isSystemFont();
51
52 float ascent = (tm.tmAscent * m_platformData.size() + 36) / 72.0f;
53 float descent = (tm.tmDescent * m_platformData.size() + 36) / 72.0f;
54 float lineGap = (tm.tmExternalLeading * m_platformData.size() + 36) / 72.0f;
55 m_fontMetrics.setAscent(ascent);
56 m_fontMetrics.setDescent(descent);
57 m_fontMetrics.setLineGap(lineGap);
58 m_fontMetrics.setLineSpacing(lroundf(ascent) + lroundf(descent) + lroundf(lineGap));
59 m_fontMetrics.setXHeight(ascent * 0.56f);
60 }
61
platformDestroy()62 void SimpleFontData::platformDestroy()
63 {
64 }
65
scaledFontData(const FontDescription & fontDescription,float scaleFactor) const66 SimpleFontData* SimpleFontData::scaledFontData(const FontDescription& fontDescription, float scaleFactor) const
67 {
68 FontDescription fontDesc(fontDescription);
69 fontDesc.setComputedSize(lroundf(scaleFactor * fontDesc.computedSize()));
70 fontDesc.setSpecifiedSize(lroundf(scaleFactor * fontDesc.specifiedSize()));
71 fontDesc.setKeywordSize(lroundf(scaleFactor * fontDesc.keywordSize()));
72 FontPlatformData* result = fontCache()->getCachedFontPlatformData(fontDesc, m_platformData.family());
73 return result ? new SimpleFontData(*result) : 0;
74 }
75
smallCapsFontData(const FontDescription & fontDescription) const76 SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
77 {
78 if (!m_derivedFontData)
79 m_derivedFontData = DerivedFontData::create(isCustomFont());
80 if (!m_derivedFontData->smallCaps)
81 m_derivedFontData->smallCaps = scaledFontData(fontDescription, .7);
82
83 return m_derivedFontData->smallCaps.get();
84 }
85
emphasisMarkFontData(const FontDescription & fontDescription) const86 SimpleFontData* SimpleFontData::emphasisMarkFontData(const FontDescription& fontDescription) const
87 {
88 if (!m_derivedFontData)
89 m_derivedFontData = DerivedFontData::create(isCustomFont());
90 if (!m_derivedFontData->emphasisMark)
91 m_derivedFontData->emphasisMark = scaledFontData(fontDescription, .5);
92
93 return m_derivedFontData->emphasisMark.get();
94 }
95
96 DWORD getKnownFontCodePages(const wchar_t* family);
97
containsCharacters(const UChar * characters,int length) const98 bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
99 {
100 if (m_platformData.isDisabled())
101 return true;
102
103 // FIXME: Microsoft documentation seems to imply that characters can be output using a given font and DC
104 // merely by testing code page intersection. This seems suspect though. Can't a font only partially
105 // cover a given code page?
106
107 // FIXME: in the case that we failed to get the interface, still use the font.
108 #if defined(IMLANG_FONT_LINK) && (IMLANG_FONT_LINK == 2)
109 IMLangFontLink2* langFontLink = fontCache()->getFontLinkInterface();
110 #else
111 IMLangFontLink* langFontLink = fontCache()->getFontLinkInterface();
112 #endif
113 if (!langFontLink)
114 return true;
115
116 DWORD fontCodePages = m_platformData.codePages();
117 if (!fontCodePages)
118 return false;
119
120 DWORD acpCodePages = 0;
121 langFontLink->CodePageToCodePages(CP_ACP, &acpCodePages);
122
123 DWORD actualCodePages;
124 long numCharactersProcessed;
125 while (length) {
126 langFontLink->GetStrCodePages(characters, length, acpCodePages, &actualCodePages, &numCharactersProcessed);
127 if (actualCodePages && !(actualCodePages & fontCodePages))
128 return false;
129
130 length -= numCharactersProcessed;
131 characters += numCharactersProcessed;
132 }
133
134 return true;
135 }
136
determinePitch()137 void SimpleFontData::determinePitch()
138 {
139 if (!m_platformData.isValid())
140 return;
141
142 const TEXTMETRIC& tm = m_platformData.metrics();
143
144 // Yes, this looks backwards, but the fixed pitch bit is actually set if the font
145 // is *not* fixed pitch. Unbelievable but true.
146 m_treatAsFixedPitch = !(tm.tmPitchAndFamily & TMPF_FIXED_PITCH);
147 }
148
platformBoundsForGlyph(Glyph) const149 FloatRect SimpleFontData::platformBoundsForGlyph(Glyph) const
150 {
151 return FloatRect();
152 }
153
platformWidthForGlyph(Glyph glyph) const154 float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
155 {
156 if (m_platformData.isDisabled())
157 return 0;
158
159 HGDIOBJ hOldFont = SelectObject(g_screenDC, m_platformData.hfont());
160
161 SIZE fontSize;
162 wchar_t c = glyph;
163 GetTextExtentPoint32(g_screenDC, &c, 1, &fontSize);
164
165 SelectObject(g_screenDC, hOldFont);
166
167 return (float)fontSize.cx * (float)m_platformData.size() / 72.f;
168 }
169
170
platformCharWidthInit()171 void SimpleFontData::platformCharWidthInit()
172 {
173 if (!m_platformData.isValid())
174 return;
175
176 const TEXTMETRIC& tm = m_platformData.metrics();
177 m_avgCharWidth = (tm.tmAveCharWidth * m_platformData.size() + 36) / 72;
178 m_maxCharWidth = (tm.tmMaxCharWidth * m_platformData.size() + 36) / 72;
179 }
180
181 } // namespace WebCore
182