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 "Font.h"
33#include "FontCache.h"
34#include "FloatRect.h"
35#include "FontDescription.h"
36#include "PlatformString.h"
37#include <ApplicationServices/ApplicationServices.h>
38#include <WebKitSystemInterface/WebKitSystemInterface.h>
39#include <mlang.h>
40#include <unicode/uchar.h>
41#include <unicode/unorm.h>
42#include <winsock2.h>
43#include <wtf/MathExtras.h>
44#include <wtf/RetainPtr.h>
45
46namespace WebCore {
47
48using std::max;
49
50static inline float scaleEmToUnits(float x, unsigned unitsPerEm) { return unitsPerEm ? x / static_cast<float>(unitsPerEm) : x; }
51
52void SimpleFontData::platformInit()
53{
54    m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f;
55    m_scriptCache = 0;
56    m_scriptFontProperties = 0;
57    m_isSystemFont = false;
58
59    if (m_platformData.useGDI())
60       return initGDIFont();
61
62    CGFontRef font = m_platformData.cgFont();
63    int iAscent = CGFontGetAscent(font);
64    int iDescent = CGFontGetDescent(font);
65    int iLineGap = CGFontGetLeading(font);
66    unsigned unitsPerEm = CGFontGetUnitsPerEm(font);
67    float pointSize = m_platformData.size();
68    float fAscent = scaleEmToUnits(iAscent, unitsPerEm) * pointSize;
69    float fDescent = -scaleEmToUnits(iDescent, unitsPerEm) * pointSize;
70    float fLineGap = scaleEmToUnits(iLineGap, unitsPerEm) * pointSize;
71
72    if (!isCustomFont()) {
73        HDC dc = GetDC(0);
74        HGDIOBJ oldFont = SelectObject(dc, m_platformData.hfont());
75        int faceLength = GetTextFace(dc, 0, 0);
76        Vector<WCHAR> faceName(faceLength);
77        GetTextFace(dc, faceLength, faceName.data());
78        m_isSystemFont = !wcscmp(faceName.data(), L"Lucida Grande");
79        SelectObject(dc, oldFont);
80        ReleaseDC(0, dc);
81
82        if (shouldApplyMacAscentHack()) {
83            // This code comes from FontDataMac.mm. We only ever do this when running regression tests so that our metrics will match Mac.
84
85            // We need to adjust Times, Helvetica, and Courier to closely match the
86            // vertical metrics of their Microsoft counterparts that are the de facto
87            // web standard. The AppKit adjustment of 20% is too big and is
88            // incorrectly added to line spacing, so we use a 15% adjustment instead
89            // and add it to the ascent.
90            if (!wcscmp(faceName.data(), L"Times") || !wcscmp(faceName.data(), L"Helvetica") || !wcscmp(faceName.data(), L"Courier"))
91                fAscent += floorf(((fAscent + fDescent) * 0.15f) + 0.5f);
92        }
93    }
94
95    m_fontMetrics.setAscent(fAscent);
96    m_fontMetrics.setDescent(fDescent);
97    m_fontMetrics.setLineGap(fLineGap);
98    m_fontMetrics.setLineSpacing(lroundf(fAscent) + lroundf(fDescent) + lroundf(fLineGap));
99
100    GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
101    Glyph xGlyph = glyphPageZero ? glyphPageZero->glyphDataForCharacter('x').glyph : 0;
102    if (xGlyph) {
103        // Measure the actual character "x", since it's possible for it to extend below the baseline, and we need the
104        // reported x-height to only include the portion of the glyph that is above the baseline.
105        CGRect xBox;
106        CGFontGetGlyphBBoxes(font, &xGlyph, 1, &xBox);
107        m_fontMetrics.setXHeight(scaleEmToUnits(CGRectGetMaxY(xBox), unitsPerEm) * pointSize);
108    } else {
109        int iXHeight = CGFontGetXHeight(font);
110        m_fontMetrics.setXHeight(scaleEmToUnits(iXHeight, unitsPerEm) * pointSize);
111    }
112
113    m_fontMetrics.setUnitsPerEm(unitsPerEm);
114}
115
116void SimpleFontData::platformCharWidthInit()
117{
118    // GDI Fonts init charwidths in initGDIFont.
119    if (!m_platformData.useGDI()) {
120        m_avgCharWidth = 0.f;
121        m_maxCharWidth = 0.f;
122        initCharWidths();
123    }
124}
125FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const
126{
127    if (m_platformData.useGDI())
128        return boundsForGDIGlyph(glyph);
129
130    CGRect box;
131    CGFontGetGlyphBBoxes(m_platformData.cgFont(), &glyph, 1, &box);
132    float pointSize = m_platformData.size();
133    CGFloat scale = pointSize / fontMetrics().unitsPerEm();
134    FloatRect boundingBox = CGRectApplyAffineTransform(box, CGAffineTransformMakeScale(scale, -scale));
135    if (m_syntheticBoldOffset)
136        boundingBox.setWidth(boundingBox.width() + m_syntheticBoldOffset);
137
138    return boundingBox;
139}
140
141float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
142{
143    if (m_platformData.useGDI())
144        return widthForGDIGlyph(glyph);
145
146    CGFontRef font = m_platformData.cgFont();
147    float pointSize = m_platformData.size();
148    CGSize advance;
149    CGAffineTransform m = CGAffineTransformMakeScale(pointSize, pointSize);
150
151    // FIXME: Need to add real support for printer fonts.
152    bool isPrinterFont = false;
153    wkGetGlyphAdvances(font, m, m_isSystemFont, isPrinterFont, glyph, advance);
154
155    return advance.width + m_syntheticBoldOffset;
156}
157
158}
159