18e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project/* 28e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. 38e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * Copyright (C) 2006 Michael Emmel mike.emmel@gmail.com 48e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * Copyright (C) 2007, 2008 Alp Toker <alp@atoker.com> 58e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * Copyright (C) 2007 Holger Hans Peter Freyther 68e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * Copyright (C) 2007 Pioneer Research Center USA, Inc. 78e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * All rights reserved. 88e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * 98e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * Redistribution and use in source and binary forms, with or without 108e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * modification, are permitted provided that the following conditions 118e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * are met: 128e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * 138e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * 1. Redistributions of source code must retain the above copyright 148e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * notice, this list of conditions and the following disclaimer. 158e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 168e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * notice, this list of conditions and the following disclaimer in the 178e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * documentation and/or other materials provided with the distribution. 188e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 198e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * its contributors may be used to endorse or promote products derived 208e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * from this software without specific prior written permission. 218e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * 228e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 238e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 248e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 258e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 268e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 278e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 288e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 298e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 308e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 318e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 328e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project */ 338e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 348e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include "config.h" 358e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include "SimpleFontData.h" 368e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 378e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include "FloatRect.h" 388e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include "Font.h" 398e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include "FontCache.h" 408e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include "FontDescription.h" 418e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include "GlyphBuffer.h" 428e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include <cairo.h> 438e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include <wtf/MathExtras.h> 448e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 458e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Projectnamespace WebCore { 468e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 478e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Projectvoid SimpleFontData::platformInit() 488e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project{ 498e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project cairo_font_extents_t font_extents; 508e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project cairo_text_extents_t text_extents; 515f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian cairo_scaled_font_extents(m_platformData.m_scaledFont, &font_extents); 522fc2651226baac27029e38c9d6ef883fa32084dbSteve Block 532fc2651226baac27029e38c9d6ef883fa32084dbSteve Block m_fontMetrics.setAscent(font_extents.ascent); 542fc2651226baac27029e38c9d6ef883fa32084dbSteve Block m_fontMetrics.setDescent(font_extents.descent); 552fc2651226baac27029e38c9d6ef883fa32084dbSteve Block 568f72e70a9fd78eec56623b3a62e68f16b7b27e28Feng Qian // There seems to be some rounding error in cairo (or in how we 578f72e70a9fd78eec56623b3a62e68f16b7b27e28Feng Qian // use cairo) with some fonts, like DejaVu Sans Mono, which makes 588f72e70a9fd78eec56623b3a62e68f16b7b27e28Feng Qian // cairo report a height smaller than ascent + descent, which is 598f72e70a9fd78eec56623b3a62e68f16b7b27e28Feng Qian // wrong and confuses WebCore's layout system. Workaround this 608f72e70a9fd78eec56623b3a62e68f16b7b27e28Feng Qian // while we figure out what's going on. 612fc2651226baac27029e38c9d6ef883fa32084dbSteve Block float lineSpacing = font_extents.height; 622fc2651226baac27029e38c9d6ef883fa32084dbSteve Block if (lineSpacing < font_extents.ascent + font_extents.descent) 632fc2651226baac27029e38c9d6ef883fa32084dbSteve Block lineSpacing = font_extents.ascent + font_extents.descent; 642fc2651226baac27029e38c9d6ef883fa32084dbSteve Block m_fontMetrics.setLineSpacing(lroundf(lineSpacing)); 652fc2651226baac27029e38c9d6ef883fa32084dbSteve Block m_fontMetrics.setLineGap(lineSpacing - font_extents.ascent - font_extents.descent); 662fc2651226baac27029e38c9d6ef883fa32084dbSteve Block 675f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian cairo_scaled_font_text_extents(m_platformData.m_scaledFont, "x", &text_extents); 682fc2651226baac27029e38c9d6ef883fa32084dbSteve Block m_fontMetrics.setXHeight(text_extents.height); 692fc2651226baac27029e38c9d6ef883fa32084dbSteve Block 705f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian cairo_scaled_font_text_extents(m_platformData.m_scaledFont, " ", &text_extents); 712fc2651226baac27029e38c9d6ef883fa32084dbSteve Block m_spaceWidth = static_cast<float>(text_extents.x_advance); 722fc2651226baac27029e38c9d6ef883fa32084dbSteve Block 735f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f; 745f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian} 755f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian 765f1ab04193ad0130ca8204aadaceae083aca9881Feng Qianvoid SimpleFontData::platformCharWidthInit() 775f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian{ 785f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian m_avgCharWidth = 0.f; 795f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian m_maxCharWidth = 0.f; 805f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian initCharWidths(); 818e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project} 828e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 838e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Projectvoid SimpleFontData::platformDestroy() 848e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project{ 85f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch} 86f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch 87f05b935882198ccf7d81675736e3aeb089c5113aBen MurdochSimpleFontData* SimpleFontData::scaledFontData(const FontDescription& fontDescription, float scaleFactor) const 88f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch{ 89f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch FontDescription desc = FontDescription(fontDescription); 90f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch desc.setSpecifiedSize(scaleFactor * fontDescription.computedSize()); 91f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch FontPlatformData platformData(desc, desc.family().family()); 92f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch return new SimpleFontData(platformData); 938e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project} 948e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 958e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source ProjectSimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const 968e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project{ 97f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch if (!m_derivedFontData) 98f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch m_derivedFontData = DerivedFontData::create(isCustomFont()); 99f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch if (!m_derivedFontData->smallCaps) 100f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch m_derivedFontData->smallCaps = scaledFontData(fontDescription, .7); 101f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch 102f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch return m_derivedFontData->smallCaps.get(); 103f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch} 104f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch 105f05b935882198ccf7d81675736e3aeb089c5113aBen MurdochSimpleFontData* SimpleFontData::emphasisMarkFontData(const FontDescription& fontDescription) const 106f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch{ 107f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch if (!m_derivedFontData) 108f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch m_derivedFontData = DerivedFontData::create(isCustomFont()); 109f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch if (!m_derivedFontData->emphasisMark) 110f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch m_derivedFontData->emphasisMark = scaledFontData(fontDescription, .5); 111f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch 112f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch return m_derivedFontData->emphasisMark.get(); 1138e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project} 1148e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 1158e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Projectbool SimpleFontData::containsCharacters(const UChar* characters, int length) const 1168e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project{ 1178e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project bool result = true; 1188e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 1195f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian PangoCoverage* coverage = pango_font_get_coverage(m_platformData.m_font, pango_language_get_default()); 1208e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 1218e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project for (int i = 0; i < length; i++) { 122635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (PANGO_COVERAGE_NONE == pango_coverage_get(coverage, characters[i])) { 1238e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project result = false; 1248e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project break; 1258e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project } 1268e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project } 1278e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 128635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project pango_coverage_unref(coverage); 1298e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 1308e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project return result; 1318e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project} 1328e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 1338e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Projectvoid SimpleFontData::determinePitch() 1348e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project{ 135635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project if (isCustomFont()) { 136635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project m_treatAsFixedPitch = false; 137635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project return; 138635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project } 139635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 1405f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian m_treatAsFixedPitch = m_platformData.isFixedPitch(); 1418e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project} 1428e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 14321939df44de1705786c545cd1bf519d47250322dBen MurdochFloatRect SimpleFontData::platformBoundsForGlyph(Glyph) const 14421939df44de1705786c545cd1bf519d47250322dBen Murdoch{ 14521939df44de1705786c545cd1bf519d47250322dBen Murdoch return FloatRect(); 14621939df44de1705786c545cd1bf519d47250322dBen Murdoch} 14721939df44de1705786c545cd1bf519d47250322dBen Murdoch 14821939df44de1705786c545cd1bf519d47250322dBen Murdochfloat SimpleFontData::platformWidthForGlyph(Glyph glyph) const 1498e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project{ 1505f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian ASSERT(m_platformData.m_scaledFont); 1518e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 1528e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project cairo_glyph_t cglyph = { glyph, 0, 0 }; 1538e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project cairo_text_extents_t extents; 1545f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian cairo_scaled_font_glyph_extents(m_platformData.m_scaledFont, &cglyph, 1, &extents); 1558e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 15621939df44de1705786c545cd1bf519d47250322dBen Murdoch float width = (float)m_spaceWidth; 1575f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian if (cairo_scaled_font_status(m_platformData.m_scaledFont) == CAIRO_STATUS_SUCCESS && extents.x_advance != 0) 15821939df44de1705786c545cd1bf519d47250322dBen Murdoch width = (float)extents.x_advance; 15921939df44de1705786c545cd1bf519d47250322dBen Murdoch 16021939df44de1705786c545cd1bf519d47250322dBen Murdoch return width; 1618e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project} 1628e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 1638e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project} 164