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 * All rights reserved.
78e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project *
88e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * Redistribution and use in source and binary forms, with or without
98e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * modification, are permitted provided that the following conditions
108e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * are met:
118e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project *
128e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * 1.  Redistributions of source code must retain the above copyright
138e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project *     notice, this list of conditions and the following disclaimer.
148e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * 2.  Redistributions in binary form must reproduce the above copyright
158e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project *     notice, this list of conditions and the following disclaimer in the
168e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project *     documentation and/or other materials provided with the distribution.
178e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
188e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project *     its contributors may be used to endorse or promote products derived
198e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project *     from this software without specific prior written permission.
208e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project *
218e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
228e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
238e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
248e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
258e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
268e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
278e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
288e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
298e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
308e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
318e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project */
328e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
338e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include "config.h"
348e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include "SimpleFontData.h"
358e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
368e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include "FloatRect.h"
378e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include "Font.h"
388e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include "FontCache.h"
398e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include "FontDescription.h"
408e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include "GlyphBuffer.h"
41bec39347bb3bb5bf1187ccaf471d26247f28b585Kristian Monsen#include <cairo-ft.h>
428e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include <cairo.h>
43bec39347bb3bb5bf1187ccaf471d26247f28b585Kristian Monsen#include <fontconfig/fcfreetype.h>
448e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include <wtf/MathExtras.h>
458e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
468e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Projectnamespace WebCore {
478e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
488e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Projectvoid SimpleFontData::platformInit()
498e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project{
508e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project    cairo_font_extents_t font_extents;
518e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project    cairo_text_extents_t text_extents;
5228040489d744e0c5d475a88663056c9040ed5320Teng-Hui Zhu    cairo_scaled_font_extents(m_platformData.scaledFont(), &font_extents);
532fc2651226baac27029e38c9d6ef883fa32084dbSteve Block
542fc2651226baac27029e38c9d6ef883fa32084dbSteve Block    m_fontMetrics.setAscent(font_extents.ascent);
552fc2651226baac27029e38c9d6ef883fa32084dbSteve Block    m_fontMetrics.setDescent(font_extents.descent);
562fc2651226baac27029e38c9d6ef883fa32084dbSteve Block
578f72e70a9fd78eec56623b3a62e68f16b7b27e28Feng Qian    // There seems to be some rounding error in cairo (or in how we
588f72e70a9fd78eec56623b3a62e68f16b7b27e28Feng Qian    // use cairo) with some fonts, like DejaVu Sans Mono, which makes
598f72e70a9fd78eec56623b3a62e68f16b7b27e28Feng Qian    // cairo report a height smaller than ascent + descent, which is
608f72e70a9fd78eec56623b3a62e68f16b7b27e28Feng Qian    // wrong and confuses WebCore's layout system. Workaround this
618f72e70a9fd78eec56623b3a62e68f16b7b27e28Feng Qian    // while we figure out what's going on.
622fc2651226baac27029e38c9d6ef883fa32084dbSteve Block    float lineSpacing = font_extents.height;
632fc2651226baac27029e38c9d6ef883fa32084dbSteve Block    if (lineSpacing < font_extents.ascent + font_extents.descent)
642fc2651226baac27029e38c9d6ef883fa32084dbSteve Block        lineSpacing = font_extents.ascent + font_extents.descent;
652fc2651226baac27029e38c9d6ef883fa32084dbSteve Block
662fc2651226baac27029e38c9d6ef883fa32084dbSteve Block    m_fontMetrics.setLineSpacing(lroundf(lineSpacing));
672fc2651226baac27029e38c9d6ef883fa32084dbSteve Block    m_fontMetrics.setLineGap(lineSpacing - font_extents.ascent - font_extents.descent);
682fc2651226baac27029e38c9d6ef883fa32084dbSteve Block
6928040489d744e0c5d475a88663056c9040ed5320Teng-Hui Zhu    cairo_scaled_font_text_extents(m_platformData.scaledFont(), "x", &text_extents);
702fc2651226baac27029e38c9d6ef883fa32084dbSteve Block    m_fontMetrics.setXHeight(text_extents.height);
712fc2651226baac27029e38c9d6ef883fa32084dbSteve Block
7228040489d744e0c5d475a88663056c9040ed5320Teng-Hui Zhu    cairo_scaled_font_text_extents(m_platformData.scaledFont(), " ", &text_extents);
73231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block    m_spaceWidth = static_cast<float>(text_extents.x_advance);
742fc2651226baac27029e38c9d6ef883fa32084dbSteve Block
755f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian    m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f;
765f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian}
775f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian
785f1ab04193ad0130ca8204aadaceae083aca9881Feng Qianvoid SimpleFontData::platformCharWidthInit()
795f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian{
805f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian    m_avgCharWidth = 0.f;
815f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian    m_maxCharWidth = 0.f;
825f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian    initCharWidths();
838e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project}
848e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
858e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Projectvoid SimpleFontData::platformDestroy()
868e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project{
878e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project}
888e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
89f05b935882198ccf7d81675736e3aeb089c5113aBen MurdochSimpleFontData* SimpleFontData::scaledFontData(const FontDescription& fontDescription, float scaleFactor) const
90f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch{
91f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch    return new SimpleFontData(FontPlatformData(cairo_scaled_font_get_font_face(m_platformData.scaledFont()),
92f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch        scaleFactor * fontDescription.computedSize(), m_platformData.syntheticBold(), m_platformData.syntheticOblique()),
93f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch        isCustomFont(), false);
94f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch}
95f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch
968e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source ProjectSimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const
978e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project{
98f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch    if (!m_derivedFontData)
99f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch        m_derivedFontData = DerivedFontData::create(isCustomFont());
100bec39347bb3bb5bf1187ccaf471d26247f28b585Kristian Monsen    // FIXME: I think we want to ask FontConfig for the right font again.
101f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch    if (!m_derivedFontData->smallCaps)
102f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch        m_derivedFontData->smallCaps = scaledFontData(fontDescription, .7);
103f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch
104f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch    return m_derivedFontData->smallCaps.get();
105f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch}
106f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch
107f05b935882198ccf7d81675736e3aeb089c5113aBen MurdochSimpleFontData* SimpleFontData::emphasisMarkFontData(const FontDescription& fontDescription) const
108f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch{
109f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch    if (!m_derivedFontData)
110f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch        m_derivedFontData = DerivedFontData::create(isCustomFont());
111f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch    if (!m_derivedFontData->emphasisMark)
112f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch        m_derivedFontData->emphasisMark = scaledFontData(fontDescription, .5);
113bec39347bb3bb5bf1187ccaf471d26247f28b585Kristian Monsen
114f05b935882198ccf7d81675736e3aeb089c5113aBen Murdoch    return m_derivedFontData->emphasisMark.get();
1158e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project}
1168e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
1178e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Projectbool SimpleFontData::containsCharacters(const UChar* characters, int length) const
1188e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project{
11928040489d744e0c5d475a88663056c9040ed5320Teng-Hui Zhu    FT_Face face = cairo_ft_scaled_font_lock_face(m_platformData.scaledFont());
1208e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
1218e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project    if (!face)
1228e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project        return false;
1238e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
1240bf48ef3be53ddaa52bbead65dfd75bf90e7a2b5Ben Murdoch    for (int i = 0; i < length; i++) {
1258e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project        if (FcFreeTypeCharIndex(face, characters[i]) == 0) {
12628040489d744e0c5d475a88663056c9040ed5320Teng-Hui Zhu            cairo_ft_scaled_font_unlock_face(m_platformData.scaledFont());
1278e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project            return false;
1288e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project        }
1298e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project    }
1308e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
13128040489d744e0c5d475a88663056c9040ed5320Teng-Hui Zhu    cairo_ft_scaled_font_unlock_face(m_platformData.scaledFont());
1328e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
1338e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project    return true;
1348e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project}
1358e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
1368e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Projectvoid SimpleFontData::determinePitch()
1378e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project{
1385f1ab04193ad0130ca8204aadaceae083aca9881Feng Qian    m_treatAsFixedPitch = m_platformData.isFixedPitch();
1398e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project}
1408e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
14121939df44de1705786c545cd1bf519d47250322dBen MurdochFloatRect SimpleFontData::platformBoundsForGlyph(Glyph) const
14221939df44de1705786c545cd1bf519d47250322dBen Murdoch{
14321939df44de1705786c545cd1bf519d47250322dBen Murdoch    return FloatRect();
14421939df44de1705786c545cd1bf519d47250322dBen Murdoch}
14521939df44de1705786c545cd1bf519d47250322dBen Murdoch
14621939df44de1705786c545cd1bf519d47250322dBen Murdochfloat SimpleFontData::platformWidthForGlyph(Glyph glyph) const
1478e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project{
14828040489d744e0c5d475a88663056c9040ed5320Teng-Hui Zhu    ASSERT(m_platformData.scaledFont());
1498e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
1508e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project    cairo_glyph_t cglyph = { glyph, 0, 0 };
1518e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project    cairo_text_extents_t extents;
15228040489d744e0c5d475a88663056c9040ed5320Teng-Hui Zhu    cairo_scaled_font_glyph_extents(m_platformData.scaledFont(), &cglyph, 1, &extents);
1538e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
1548e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project    float w = (float)m_spaceWidth;
15528040489d744e0c5d475a88663056c9040ed5320Teng-Hui Zhu    if (cairo_scaled_font_status(m_platformData.scaledFont()) == CAIRO_STATUS_SUCCESS && extents.x_advance)
1568e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project        w = (float)extents.x_advance;
15721939df44de1705786c545cd1bf519d47250322dBen Murdoch
15821939df44de1705786c545cd1bf519d47250322dBen Murdoch    return w;
1598e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project}
1608e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project
1618e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project}
162