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.h> 42 #include <wtf/MathExtras.h> 43 44 namespace WebCore { 45 46 void SimpleFontData::platformInit() 47 { 48 cairo_font_extents_t font_extents; 49 cairo_text_extents_t text_extents; 50 cairo_scaled_font_extents(m_platformData.m_scaledFont, &font_extents); 51 m_ascent = static_cast<int>(lroundf(font_extents.ascent)); 52 m_descent = static_cast<int>(lroundf(font_extents.descent)); 53 m_lineSpacing = static_cast<int>(lroundf(font_extents.height)); 54 // There seems to be some rounding error in cairo (or in how we 55 // use cairo) with some fonts, like DejaVu Sans Mono, which makes 56 // cairo report a height smaller than ascent + descent, which is 57 // wrong and confuses WebCore's layout system. Workaround this 58 // while we figure out what's going on. 59 if (m_lineSpacing < m_ascent + m_descent) 60 m_lineSpacing = m_ascent + m_descent; 61 cairo_scaled_font_text_extents(m_platformData.m_scaledFont, "x", &text_extents); 62 m_xHeight = text_extents.height; 63 cairo_scaled_font_text_extents(m_platformData.m_scaledFont, " ", &text_extents); 64 m_spaceWidth = static_cast<float>(text_extents.x_advance); 65 m_lineGap = m_lineSpacing - m_ascent - m_descent; 66 m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f; 67 } 68 69 void SimpleFontData::platformCharWidthInit() 70 { 71 m_avgCharWidth = 0.f; 72 m_maxCharWidth = 0.f; 73 initCharWidths(); 74 } 75 76 void SimpleFontData::platformDestroy() 77 { 78 delete m_smallCapsFontData; 79 m_smallCapsFontData = 0; 80 } 81 82 SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const 83 { 84 if (!m_smallCapsFontData) { 85 FontDescription desc = FontDescription(fontDescription); 86 desc.setComputedSize(0.70f*fontDescription.computedSize()); 87 const FontPlatformData* pdata = new FontPlatformData(desc, desc.family().family()); 88 m_smallCapsFontData = new SimpleFontData(*pdata); 89 } 90 return m_smallCapsFontData; 91 } 92 93 bool SimpleFontData::containsCharacters(const UChar* characters, int length) const 94 { 95 FT_Face face = cairo_ft_scaled_font_lock_face(m_platformData.m_scaledFont); 96 97 if (!face) 98 return false; 99 100 for (int i = 0; i < length; i++) { 101 if (FcFreeTypeCharIndex(face, characters[i]) == 0) { 102 cairo_ft_scaled_font_unlock_face(m_platformData.m_scaledFont); 103 return false; 104 } 105 } 106 107 cairo_ft_scaled_font_unlock_face(m_platformData.m_scaledFont); 108 109 return true; 110 } 111 112 void SimpleFontData::determinePitch() 113 { 114 m_treatAsFixedPitch = m_platformData.isFixedPitch(); 115 } 116 117 float SimpleFontData::platformWidthForGlyph(Glyph glyph) const 118 { 119 ASSERT(m_platformData.m_scaledFont); 120 121 cairo_glyph_t cglyph = { glyph, 0, 0 }; 122 cairo_text_extents_t extents; 123 cairo_scaled_font_glyph_extents(m_platformData.m_scaledFont, &cglyph, 1, &extents); 124 125 float w = (float)m_spaceWidth; 126 if (cairo_scaled_font_status(m_platformData.m_scaledFont) == CAIRO_STATUS_SUCCESS && extents.x_advance != 0) 127 w = (float)extents.x_advance; 128 return w; 129 } 130 131 } 132
