1 /* 2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. 3 * Copyright (C) 2006 Michael Emmel mike.emmel (at) gmail.com 4 * Copyright (C) 2007, 2008 Alp Toker <alp (at) atoker.com> 5 * Copyright (C) 2007 Holger Hans Peter Freyther 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 18 * its contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 22 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 24 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 25 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 26 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 28 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include "config.h" 34 #include "SimpleFontData.h" 35 36 #include "FloatRect.h" 37 #include "Font.h" 38 #include "FontCache.h" 39 #include "FontDescription.h" 40 #include "GlyphBuffer.h" 41 #include <cairo-ft.h> 42 #include <cairo.h> 43 #include <fontconfig/fcfreetype.h> 44 #include <wtf/MathExtras.h> 45 46 namespace WebCore { 47 48 void SimpleFontData::platformInit() 49 { 50 cairo_font_extents_t font_extents; 51 cairo_text_extents_t text_extents; 52 cairo_scaled_font_extents(m_platformData.scaledFont(), &font_extents); 53 54 m_fontMetrics.setAscent(font_extents.ascent); 55 m_fontMetrics.setDescent(font_extents.descent); 56 57 // There seems to be some rounding error in cairo (or in how we 58 // use cairo) with some fonts, like DejaVu Sans Mono, which makes 59 // cairo report a height smaller than ascent + descent, which is 60 // wrong and confuses WebCore's layout system. Workaround this 61 // while we figure out what's going on. 62 float lineSpacing = font_extents.height; 63 if (lineSpacing < font_extents.ascent + font_extents.descent) 64 lineSpacing = font_extents.ascent + font_extents.descent; 65 66 m_fontMetrics.setLineSpacing(lroundf(lineSpacing)); 67 m_fontMetrics.setLineGap(lineSpacing - font_extents.ascent - font_extents.descent); 68 69 cairo_scaled_font_text_extents(m_platformData.scaledFont(), "x", &text_extents); 70 m_fontMetrics.setXHeight(text_extents.height); 71 72 cairo_scaled_font_text_extents(m_platformData.scaledFont(), " ", &text_extents); 73 m_spaceWidth = static_cast<float>(text_extents.x_advance); 74 75 m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f; 76 } 77 78 void SimpleFontData::platformCharWidthInit() 79 { 80 m_avgCharWidth = 0.f; 81 m_maxCharWidth = 0.f; 82 initCharWidths(); 83 } 84 85 void SimpleFontData::platformDestroy() 86 { 87 } 88 89 SimpleFontData* SimpleFontData::scaledFontData(const FontDescription& fontDescription, float scaleFactor) const 90 { 91 return new SimpleFontData(FontPlatformData(cairo_scaled_font_get_font_face(m_platformData.scaledFont()), 92 scaleFactor * fontDescription.computedSize(), m_platformData.syntheticBold(), m_platformData.syntheticOblique()), 93 isCustomFont(), false); 94 } 95 96 SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const 97 { 98 if (!m_derivedFontData) 99 m_derivedFontData = DerivedFontData::create(isCustomFont()); 100 // FIXME: I think we want to ask FontConfig for the right font again. 101 if (!m_derivedFontData->smallCaps) 102 m_derivedFontData->smallCaps = scaledFontData(fontDescription, .7); 103 104 return m_derivedFontData->smallCaps.get(); 105 } 106 107 SimpleFontData* SimpleFontData::emphasisMarkFontData(const FontDescription& fontDescription) const 108 { 109 if (!m_derivedFontData) 110 m_derivedFontData = DerivedFontData::create(isCustomFont()); 111 if (!m_derivedFontData->emphasisMark) 112 m_derivedFontData->emphasisMark = scaledFontData(fontDescription, .5); 113 114 return m_derivedFontData->emphasisMark.get(); 115 } 116 117 bool SimpleFontData::containsCharacters(const UChar* characters, int length) const 118 { 119 FT_Face face = cairo_ft_scaled_font_lock_face(m_platformData.scaledFont()); 120 121 if (!face) 122 return false; 123 124 for (int i = 0; i < length; i++) { 125 if (FcFreeTypeCharIndex(face, characters[i]) == 0) { 126 cairo_ft_scaled_font_unlock_face(m_platformData.scaledFont()); 127 return false; 128 } 129 } 130 131 cairo_ft_scaled_font_unlock_face(m_platformData.scaledFont()); 132 133 return true; 134 } 135 136 void SimpleFontData::determinePitch() 137 { 138 m_treatAsFixedPitch = m_platformData.isFixedPitch(); 139 } 140 141 FloatRect SimpleFontData::platformBoundsForGlyph(Glyph) const 142 { 143 return FloatRect(); 144 } 145 146 float SimpleFontData::platformWidthForGlyph(Glyph glyph) const 147 { 148 ASSERT(m_platformData.scaledFont()); 149 150 cairo_glyph_t cglyph = { glyph, 0, 0 }; 151 cairo_text_extents_t extents; 152 cairo_scaled_font_glyph_extents(m_platformData.scaledFont(), &cglyph, 1, &extents); 153 154 float w = (float)m_spaceWidth; 155 if (cairo_scaled_font_status(m_platformData.scaledFont()) == CAIRO_STATUS_SUCCESS && extents.x_advance) 156 w = (float)extents.x_advance; 157 158 return w; 159 } 160 161 } 162
