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
40namespace WebCore {
41
42extern HDC g_screenDC;
43
44void 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
62void SimpleFontData::platformDestroy()
63{
64}
65
66SimpleFontData* 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
76SimpleFontData* 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
86SimpleFontData* 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
96DWORD getKnownFontCodePages(const wchar_t* family);
97
98bool 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
137void 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
149FloatRect SimpleFontData::platformBoundsForGlyph(Glyph) const
150{
151    return FloatRect();
152}
153
154float 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
171void 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