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 <winsock2.h>
33#include "Font.h"
34#include "FontCache.h"
35#include "FloatRect.h"
36#include "FontDescription.h"
37#include <wtf/MathExtras.h>
38#include <unicode/uchar.h>
39#include <unicode/unorm.h>
40#include <mlang.h>
41#include <tchar.h>
42
43#if PLATFORM(CG)
44#include <ApplicationServices/ApplicationServices.h>
45#include <WebKitSystemInterface/WebKitSystemInterface.h>
46#endif
47
48namespace WebCore {
49
50using std::max;
51
52const float cSmallCapsFontSizeMultiplier = 0.7f;
53
54static bool g_shouldApplyMacAscentHack;
55
56void SimpleFontData::setShouldApplyMacAscentHack(bool b)
57{
58    g_shouldApplyMacAscentHack = b;
59}
60
61bool SimpleFontData::shouldApplyMacAscentHack()
62{
63    return g_shouldApplyMacAscentHack;
64}
65
66void SimpleFontData::initGDIFont()
67{
68     HDC hdc = GetDC(0);
69     HGDIOBJ oldFont = SelectObject(hdc, m_platformData.hfont());
70     OUTLINETEXTMETRIC metrics;
71     GetOutlineTextMetrics(hdc, sizeof(metrics), &metrics);
72     TEXTMETRIC& textMetrics = metrics.otmTextMetrics;
73     m_ascent = textMetrics.tmAscent;
74     m_descent = textMetrics.tmDescent;
75     m_lineGap = textMetrics.tmExternalLeading;
76     m_lineSpacing = m_ascent + m_descent + m_lineGap;
77     m_avgCharWidth = textMetrics.tmAveCharWidth;
78     m_maxCharWidth = textMetrics.tmMaxCharWidth;
79     m_xHeight = m_ascent * 0.56f; // Best guess for xHeight if no x glyph is present.
80
81     GLYPHMETRICS gm;
82     MAT2 mat = { 1, 0, 0, 1 };
83     DWORD len = GetGlyphOutline(hdc, 'x', GGO_METRICS, &gm, 0, 0, &mat);
84     if (len != GDI_ERROR && gm.gmptGlyphOrigin.y > 0)
85         m_xHeight = gm.gmptGlyphOrigin.y;
86
87     m_unitsPerEm = metrics.otmEMSquare;
88
89     SelectObject(hdc, oldFont);
90     ReleaseDC(0, hdc);
91
92     return;
93}
94
95void SimpleFontData::platformDestroy()
96{
97    // We don't hash this on Win32, so it's effectively owned by us.
98    delete m_smallCapsFontData;
99    m_smallCapsFontData = 0;
100
101    ScriptFreeCache(&m_scriptCache);
102    delete m_scriptFontProperties;
103}
104
105SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
106{
107    if (!m_smallCapsFontData) {
108        float smallCapsHeight = cSmallCapsFontSizeMultiplier * m_platformData.size();
109        if (isCustomFont()) {
110            FontPlatformData smallCapsFontData(m_platformData);
111            smallCapsFontData.setSize(smallCapsHeight);
112            m_smallCapsFontData = new SimpleFontData(smallCapsFontData, true, false);
113        } else {
114            LOGFONT winfont;
115            GetObject(m_platformData.hfont(), sizeof(LOGFONT), &winfont);
116            winfont.lfHeight = -lroundf(smallCapsHeight * (m_platformData.useGDI() ? 1 : 32));
117            HFONT hfont = CreateFontIndirect(&winfont);
118            m_smallCapsFontData = new SimpleFontData(FontPlatformData(hfont, smallCapsHeight, m_platformData.syntheticBold(), m_platformData.syntheticOblique(), m_platformData.useGDI()));
119        }
120    }
121    return m_smallCapsFontData;
122}
123
124bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
125{
126    // FIXME: Support custom fonts.
127    if (isCustomFont())
128        return false;
129
130    // FIXME: Microsoft documentation seems to imply that characters can be output using a given font and DC
131    // merely by testing code page intersection.  This seems suspect though.  Can't a font only partially
132    // cover a given code page?
133    IMLangFontLink2* langFontLink = fontCache()->getFontLinkInterface();
134    if (!langFontLink)
135        return false;
136
137    HDC dc = GetDC(0);
138
139    DWORD acpCodePages;
140    langFontLink->CodePageToCodePages(CP_ACP, &acpCodePages);
141
142    DWORD fontCodePages;
143    langFontLink->GetFontCodePages(dc, m_platformData.hfont(), &fontCodePages);
144
145    DWORD actualCodePages;
146    long numCharactersProcessed;
147    long offset = 0;
148    while (offset < length) {
149        langFontLink->GetStrCodePages(characters, length, acpCodePages, &actualCodePages, &numCharactersProcessed);
150        if ((actualCodePages & fontCodePages) == 0)
151            return false;
152        offset += numCharactersProcessed;
153    }
154
155    ReleaseDC(0, dc);
156
157    return true;
158}
159
160void SimpleFontData::determinePitch()
161{
162    if (isCustomFont()) {
163        m_treatAsFixedPitch = false;
164        return;
165    }
166
167    // TEXTMETRICS have this.  Set m_treatAsFixedPitch based off that.
168    HDC dc = GetDC(0);
169    SaveDC(dc);
170    SelectObject(dc, m_platformData.hfont());
171
172    // Yes, this looks backwards, but the fixed pitch bit is actually set if the font
173    // is *not* fixed pitch.  Unbelievable but true.
174    TEXTMETRIC tm;
175    GetTextMetrics(dc, &tm);
176    m_treatAsFixedPitch = ((tm.tmPitchAndFamily & TMPF_FIXED_PITCH) == 0);
177
178    RestoreDC(dc, -1);
179    ReleaseDC(0, dc);
180}
181
182float SimpleFontData::widthForGDIGlyph(Glyph glyph) const
183{
184    HDC hdc = GetDC(0);
185    SetGraphicsMode(hdc, GM_ADVANCED);
186    HGDIOBJ oldFont = SelectObject(hdc, m_platformData.hfont());
187    int width;
188    GetCharWidthI(hdc, glyph, 1, 0, &width);
189    SelectObject(hdc, oldFont);
190    ReleaseDC(0, hdc);
191    return width + m_syntheticBoldOffset;
192}
193
194SCRIPT_FONTPROPERTIES* SimpleFontData::scriptFontProperties() const
195{
196    if (!m_scriptFontProperties) {
197        m_scriptFontProperties = new SCRIPT_FONTPROPERTIES;
198        memset(m_scriptFontProperties, 0, sizeof(SCRIPT_FONTPROPERTIES));
199        m_scriptFontProperties->cBytes = sizeof(SCRIPT_FONTPROPERTIES);
200        HRESULT result = ScriptGetFontProperties(0, scriptCache(), m_scriptFontProperties);
201        if (result == E_PENDING) {
202            HDC dc = GetDC(0);
203            SaveDC(dc);
204            SelectObject(dc, m_platformData.hfont());
205            ScriptGetFontProperties(dc, scriptCache(), m_scriptFontProperties);
206            RestoreDC(dc, -1);
207            ReleaseDC(0, dc);
208        }
209    }
210    return m_scriptFontProperties;
211}
212
213}
214