/* * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. * Copyright (C) 2006 Michael Emmel mike.emmel@gmail.com * Copyright (C) 2007, 2008 Alp Toker * Copyright (C) 2007 Holger Hans Peter Freyther * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include "SimpleFontData.h" #include "FloatRect.h" #include "Font.h" #include "FontCache.h" #include "FontDescription.h" #include "GlyphBuffer.h" #include #include namespace WebCore { void SimpleFontData::platformInit() { cairo_font_extents_t font_extents; cairo_text_extents_t text_extents; cairo_scaled_font_extents(m_platformData.m_scaledFont, &font_extents); m_ascent = static_cast(lroundf(font_extents.ascent)); m_descent = static_cast(lroundf(font_extents.descent)); m_lineSpacing = static_cast(lroundf(font_extents.height)); // There seems to be some rounding error in cairo (or in how we // use cairo) with some fonts, like DejaVu Sans Mono, which makes // cairo report a height smaller than ascent + descent, which is // wrong and confuses WebCore's layout system. Workaround this // while we figure out what's going on. if (m_lineSpacing < m_ascent + m_descent) m_lineSpacing = m_ascent + m_descent; cairo_scaled_font_text_extents(m_platformData.m_scaledFont, "x", &text_extents); m_xHeight = text_extents.height; cairo_scaled_font_text_extents(m_platformData.m_scaledFont, " ", &text_extents); m_spaceWidth = static_cast(text_extents.x_advance); m_lineGap = m_lineSpacing - m_ascent - m_descent; m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f; } void SimpleFontData::platformCharWidthInit() { m_avgCharWidth = 0.f; m_maxCharWidth = 0.f; initCharWidths(); } void SimpleFontData::platformDestroy() { delete m_smallCapsFontData; m_smallCapsFontData = 0; } SimpleFontData* SimpleFontData::smallCapsFontData(const FontDescription& fontDescription) const { if (!m_smallCapsFontData) { FontDescription desc = FontDescription(fontDescription); desc.setComputedSize(0.70f*fontDescription.computedSize()); const FontPlatformData* pdata = new FontPlatformData(desc, desc.family().family()); m_smallCapsFontData = new SimpleFontData(*pdata); } return m_smallCapsFontData; } bool SimpleFontData::containsCharacters(const UChar* characters, int length) const { FT_Face face = cairo_ft_scaled_font_lock_face(m_platformData.m_scaledFont); if (!face) return false; for (int i = 0; i < length; i++) { if (FcFreeTypeCharIndex(face, characters[i]) == 0) { cairo_ft_scaled_font_unlock_face(m_platformData.m_scaledFont); return false; } } cairo_ft_scaled_font_unlock_face(m_platformData.m_scaledFont); return true; } void SimpleFontData::determinePitch() { m_treatAsFixedPitch = m_platformData.isFixedPitch(); } float SimpleFontData::platformWidthForGlyph(Glyph glyph) const { ASSERT(m_platformData.m_scaledFont); cairo_glyph_t cglyph = { glyph, 0, 0 }; cairo_text_extents_t extents; cairo_scaled_font_glyph_extents(m_platformData.m_scaledFont, &cglyph, 1, &extents); float w = (float)m_spaceWidth; if (cairo_scaled_font_status(m_platformData.m_scaledFont) == CAIRO_STATUS_SUCCESS && extents.x_advance != 0) w = (float)extents.x_advance; return w; } }