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
31#include "config.h"
32#include "SimpleFontData.h"
33
34#include "FloatRect.h"
35#include "Font.h"
36#include "FontCache.h"
37#include "FontDescription.h"
38#include <wtf/MathExtras.h>
39#include <mlang.h>
40#include <tchar.h>
41
42namespace WebCore {
43
44extern HDC g_screenDC;
45
46void SimpleFontData::platformInit()
47{
48    if (!m_platformData.isValid())
49        return;
50
51    const TEXTMETRIC& tm = m_platformData.metrics();
52    m_isSystemFont = m_platformData.isSystemFont();
53
54    m_ascent = (tm.tmAscent * m_platformData.size() + 36) / 72;
55    m_descent = (tm.tmDescent * m_platformData.size() + 36) / 72;
56    m_lineGap = (tm.tmExternalLeading * m_platformData.size() + 36) / 72;
57    m_lineSpacing = m_ascent + m_descent + m_lineGap;
58    m_xHeight = m_ascent * 0.56f;
59}
60
61void SimpleFontData::platformDestroy()
62{
63    delete m_smallCapsFontData;
64    m_smallCapsFontData = 0;
65}
66
67SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
68{
69    if (!m_smallCapsFontData) {
70        FontDescription fontDesc(fontDescription);
71        fontDesc.setComputedSize(lroundf(0.70f * fontDesc.computedSize()));
72        fontDesc.setSpecifiedSize(lroundf(0.70f * fontDesc.specifiedSize()));
73        fontDesc.setKeywordSize(lroundf(0.70f * fontDesc.keywordSize()));
74        FontPlatformData* result = fontCache()->getCachedFontPlatformData(fontDesc, m_platformData.family());
75        if (result)
76            m_smallCapsFontData = new SimpleFontData(*result);
77    }
78    return m_smallCapsFontData;
79}
80
81DWORD getKnownFontCodePages(const wchar_t* family);
82
83bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
84{
85    if (m_platformData.isDisabled())
86        return true;
87
88    // FIXME: Microsoft documentation seems to imply that characters can be output using a given font and DC
89    // merely by testing code page intersection.  This seems suspect though.  Can't a font only partially
90    // cover a given code page?
91
92    // FIXME: in the case that we failed to get the interface, still use the font.
93#if defined(IMLANG_FONT_LINK) && (IMLANG_FONT_LINK == 2)
94    IMLangFontLink2* langFontLink = fontCache()->getFontLinkInterface();
95#else
96    IMLangFontLink* langFontLink = fontCache()->getFontLinkInterface();
97#endif
98    if (!langFontLink)
99        return true;
100
101    DWORD fontCodePages = m_platformData.codePages();
102    if (!fontCodePages)
103        return false;
104
105    DWORD acpCodePages = 0;
106    langFontLink->CodePageToCodePages(CP_ACP, &acpCodePages);
107
108    DWORD actualCodePages;
109    long numCharactersProcessed;
110    while (length) {
111        langFontLink->GetStrCodePages(characters, length, acpCodePages, &actualCodePages, &numCharactersProcessed);
112        if (actualCodePages && !(actualCodePages & fontCodePages))
113            return false;
114
115        length -= numCharactersProcessed;
116        characters += numCharactersProcessed;
117    }
118
119    return true;
120}
121
122void SimpleFontData::determinePitch()
123{
124    if (!m_platformData.isValid())
125        return;
126
127    const TEXTMETRIC& tm = m_platformData.metrics();
128
129    // Yes, this looks backwards, but the fixed pitch bit is actually set if the font
130    // is *not* fixed pitch.  Unbelievable but true.
131    m_treatAsFixedPitch = !(tm.tmPitchAndFamily & TMPF_FIXED_PITCH);
132}
133
134float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
135{
136    if (m_platformData.isDisabled())
137        return 0;
138
139    HGDIOBJ hOldFont = SelectObject(g_screenDC, m_platformData.hfont());
140
141    SIZE fontSize;
142    wchar_t c = glyph;
143    GetTextExtentPoint32(g_screenDC, &c, 1, &fontSize);
144
145    SelectObject(g_screenDC, hOldFont);
146
147    return (float)fontSize.cx * (float)m_platformData.size() / 72.f;
148}
149
150
151void SimpleFontData::platformCharWidthInit()
152{
153    if (!m_platformData.isValid())
154        return;
155
156    const TEXTMETRIC& tm = m_platformData.metrics();
157    m_avgCharWidth = (tm.tmAveCharWidth * m_platformData.size() + 36) / 72;
158    m_maxCharWidth = (tm.tmMaxCharWidth * m_platformData.size() + 36) / 72;
159}
160
161}
162