SimpleFontDataWin.cpp revision cad810f21b803229eb11403f9209855525a25d57 
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    if (!m_platformData.size()) {
69        m_ascent = 0;
70        m_descent = 0;
71        m_lineGap = 0;
72        m_lineSpacing = 0;
73        m_avgCharWidth = 0;
74        m_maxCharWidth = 0;
75        m_xHeight = 0;
76        m_unitsPerEm = 0;
77        return;
78    }
79
80     HDC hdc = GetDC(0);
81     HGDIOBJ oldFont = SelectObject(hdc, m_platformData.hfont());
82     OUTLINETEXTMETRIC metrics;
83     GetOutlineTextMetrics(hdc, sizeof(metrics), &metrics);
84     TEXTMETRIC& textMetrics = metrics.otmTextMetrics;
85     m_ascent = textMetrics.tmAscent;
86     m_descent = textMetrics.tmDescent;
87     m_lineGap = textMetrics.tmExternalLeading;
88     m_lineSpacing = m_ascent + m_descent + m_lineGap;
89     m_avgCharWidth = textMetrics.tmAveCharWidth;
90     m_maxCharWidth = textMetrics.tmMaxCharWidth;
91     m_xHeight = m_ascent * 0.56f; // Best guess for xHeight if no x glyph is present.
92
93     GLYPHMETRICS gm;
94     MAT2 mat = { 1, 0, 0, 1 };
95     DWORD len = GetGlyphOutline(hdc, 'x', GGO_METRICS, &gm, 0, 0, &mat);
96     if (len != GDI_ERROR && gm.gmptGlyphOrigin.y > 0)
97         m_xHeight = gm.gmptGlyphOrigin.y;
98
99     m_unitsPerEm = metrics.otmEMSquare;
100
101     SelectObject(hdc, oldFont);
102     ReleaseDC(0, hdc);
103
104     return;
105}
106
107void SimpleFontData::platformDestroy()
108{
109    ScriptFreeCache(&m_scriptCache);
110    delete m_scriptFontProperties;
111}
112
113SimpleFontData* SimpleFontData::scaledFontData(const FontDescription& fontDescription, float scaleFactor) const
114{
115        float scaledSize = scaleFactor * m_platformData.size();
116        if (isCustomFont()) {
117            FontPlatformData scaledFont(m_platformData);
118            scaledFont.setSize(scaledSize);
119            return new SimpleFontData(scaledFont, true, false);
120        }
121
122        LOGFONT winfont;
123        GetObject(m_platformData.hfont(), sizeof(LOGFONT), &winfont);
124        winfont.lfHeight = -lroundf(scaledSize * (m_platformData.useGDI() ? 1 : 32));
125        HFONT hfont = CreateFontIndirect(&winfont);
126        return new SimpleFontData(FontPlatformData(hfont, scaledSize, m_platformData.syntheticBold(), m_platformData.syntheticOblique(), m_platformData.useGDI()), isCustomFont(), false);
127}
128
129SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
130{
131    if (!m_derivedFontData)
132        m_derivedFontData = DerivedFontData::create(isCustomFont());
133    if (!m_derivedFontData->smallCaps)
134        m_derivedFontData->smallCaps = scaledFontData(fontDescription, cSmallCapsFontSizeMultiplier);
135
136    return m_derivedFontData->smallCaps.get();
137}
138
139SimpleFontData* SimpleFontData::emphasisMarkFontData(const FontDescription& fontDescription) const
140{
141    if (!m_derivedFontData)
142        m_derivedFontData = DerivedFontData::create(isCustomFont());
143    if (!m_derivedFontData->emphasisMark)
144        m_derivedFontData->emphasisMark = scaledFontData(fontDescription, .5);
145
146    return m_derivedFontData->emphasisMark.get();
147}
148
149bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
150{
151    // FIXME: Support custom fonts.
152    if (isCustomFont())
153        return false;
154
155    // FIXME: Microsoft documentation seems to imply that characters can be output using a given font and DC
156    // merely by testing code page intersection.  This seems suspect though.  Can't a font only partially
157    // cover a given code page?
158    IMLangFontLink2* langFontLink = fontCache()->getFontLinkInterface();
159    if (!langFontLink)
160        return false;
161
162    HDC dc = GetDC(0);
163
164    DWORD acpCodePages;
165    langFontLink->CodePageToCodePages(CP_ACP, &acpCodePages);
166
167    DWORD fontCodePages;
168    langFontLink->GetFontCodePages(dc, m_platformData.hfont(), &fontCodePages);
169
170    DWORD actualCodePages;
171    long numCharactersProcessed;
172    long offset = 0;
173    while (offset < length) {
174        langFontLink->GetStrCodePages(characters, length, acpCodePages, &actualCodePages, &numCharactersProcessed);
175        if ((actualCodePages & fontCodePages) == 0)
176            return false;
177        offset += numCharactersProcessed;
178    }
179
180    ReleaseDC(0, dc);
181
182    return true;
183}
184
185void SimpleFontData::determinePitch()
186{
187    if (isCustomFont()) {
188        m_treatAsFixedPitch = false;
189        return;
190    }
191
192    // TEXTMETRICS have this.  Set m_treatAsFixedPitch based off that.
193    HDC dc = GetDC(0);
194    SaveDC(dc);
195    SelectObject(dc, m_platformData.hfont());
196
197    // Yes, this looks backwards, but the fixed pitch bit is actually set if the font
198    // is *not* fixed pitch.  Unbelievable but true.
199    TEXTMETRIC tm;
200    GetTextMetrics(dc, &tm);
201    m_treatAsFixedPitch = ((tm.tmPitchAndFamily & TMPF_FIXED_PITCH) == 0);
202
203    RestoreDC(dc, -1);
204    ReleaseDC(0, dc);
205}
206
207FloatRect SimpleFontData::boundsForGDIGlyph(Glyph glyph) const
208{
209    HDC hdc = GetDC(0);
210    SetGraphicsMode(hdc, GM_ADVANCED);
211    HGDIOBJ oldFont = SelectObject(hdc, m_platformData.hfont());
212
213    GLYPHMETRICS gdiMetrics;
214    static const MAT2 identity = { 0, 1,  0, 0,  0, 0,  0, 1 };
215    GetGlyphOutline(hdc, glyph, GGO_METRICS | GGO_GLYPH_INDEX, &gdiMetrics, 0, 0, &identity);
216
217    SelectObject(hdc, oldFont);
218    ReleaseDC(0, hdc);
219
220    return FloatRect(gdiMetrics.gmptGlyphOrigin.x, -gdiMetrics.gmptGlyphOrigin.y,
221        gdiMetrics.gmBlackBoxX + m_syntheticBoldOffset, gdiMetrics.gmBlackBoxY);
222}
223
224float SimpleFontData::widthForGDIGlyph(Glyph glyph) const
225{
226    HDC hdc = GetDC(0);
227    SetGraphicsMode(hdc, GM_ADVANCED);
228    HGDIOBJ oldFont = SelectObject(hdc, m_platformData.hfont());
229
230    GLYPHMETRICS gdiMetrics;
231    static const MAT2 identity = { 0, 1,  0, 0,  0, 0,  0, 1 };
232    GetGlyphOutline(hdc, glyph, GGO_METRICS | GGO_GLYPH_INDEX, &gdiMetrics, 0, 0, &identity);
233
234    SelectObject(hdc, oldFont);
235    ReleaseDC(0, hdc);
236
237    return gdiMetrics.gmCellIncX + m_syntheticBoldOffset;
238}
239
240SCRIPT_FONTPROPERTIES* SimpleFontData::scriptFontProperties() const
241{
242    if (!m_scriptFontProperties) {
243        m_scriptFontProperties = new SCRIPT_FONTPROPERTIES;
244        memset(m_scriptFontProperties, 0, sizeof(SCRIPT_FONTPROPERTIES));
245        m_scriptFontProperties->cBytes = sizeof(SCRIPT_FONTPROPERTIES);
246        HRESULT result = ScriptGetFontProperties(0, scriptCache(), m_scriptFontProperties);
247        if (result == E_PENDING) {
248            HDC dc = GetDC(0);
249            SaveDC(dc);
250            SelectObject(dc, m_platformData.hfont());
251            ScriptGetFontProperties(dc, scriptCache(), m_scriptFontProperties);
252            RestoreDC(dc, -1);
253            ReleaseDC(0, dc);
254        }
255    }
256    return m_scriptFontProperties;
257}
258
259}
260