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 46 namespace WebCore { 47 48 using std::max; 49 50 static inline float scaleEmToUnits(float x, unsigned unitsPerEm) { return unitsPerEm ? x / static_cast<float>(unitsPerEm) : x; } 51 52 void 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 } 115 116 void 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 } 125 FloatRect 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 } 140 141 float 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