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 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
66PassRefPtr<SimpleFontData> SimpleFontData::platformCreateScaledFontData(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    if (!result)
74        return 0;
75    return SimpleFontData::create(*result);
76}
77
78DWORD getKnownFontCodePages(const wchar_t* family);
79
80bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
81{
82    if (m_platformData.isDisabled())
83        return true;
84
85    // FIXME: Microsoft documentation seems to imply that characters can be output using a given font and DC
86    // merely by testing code page intersection.  This seems suspect though.  Can't a font only partially
87    // cover a given code page?
88
89    // FIXME: in the case that we failed to get the interface, still use the font.
90    IMLangFontLinkType* langFontLink = fontCache().getFontLinkInterface();
91    if (!langFontLink)
92        return true;
93
94    DWORD fontCodePages = m_platformData.codePages();
95    if (!fontCodePages)
96        return false;
97
98    DWORD acpCodePages = 0;
99    langFontLink->CodePageToCodePages(CP_ACP, &acpCodePages);
100
101    DWORD actualCodePages;
102    long numCharactersProcessed;
103    while (length) {
104        langFontLink->GetStrCodePages(characters, length, acpCodePages, &actualCodePages, &numCharactersProcessed);
105        if (actualCodePages && !(actualCodePages & fontCodePages))
106            return false;
107
108        length -= numCharactersProcessed;
109        characters += numCharactersProcessed;
110    }
111
112    return true;
113}
114
115void SimpleFontData::determinePitch()
116{
117    if (!m_platformData.isValid())
118        return;
119
120    const TEXTMETRIC& tm = m_platformData.metrics();
121
122    // Yes, this looks backwards, but the fixed pitch bit is actually set if the font
123    // is *not* fixed pitch.  Unbelievable but true.
124    m_treatAsFixedPitch = !(tm.tmPitchAndFamily & TMPF_FIXED_PITCH);
125}
126
127FloatRect SimpleFontData::platformBoundsForGlyph(Glyph) const
128{
129    return FloatRect();
130}
131
132float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
133{
134    if (m_platformData.isDisabled())
135        return 0;
136
137    HGDIOBJ hOldFont = SelectObject(g_screenDC, m_platformData.hfont());
138
139    SIZE fontSize;
140    wchar_t c = glyph;
141    GetTextExtentPoint32(g_screenDC, &c, 1, &fontSize);
142
143    SelectObject(g_screenDC, hOldFont);
144
145    return (float)fontSize.cx * (float)m_platformData.size() / 72.f;
146}
147
148
149void SimpleFontData::platformCharWidthInit()
150{
151    if (!m_platformData.isValid())
152        return;
153
154    const TEXTMETRIC& tm = m_platformData.metrics();
155    m_avgCharWidth = (tm.tmAveCharWidth * m_platformData.size() + 36) / 72;
156    m_maxCharWidth = (tm.tmMaxCharWidth * m_platformData.size() + 36) / 72;
157}
158
159} // namespace WebCore
160