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/*
* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
* Copyright (C) 2006 Michael Emmel mike.emmel@gmail.com
* Copyright (C) 2007, 2008 Alp Toker <alp@atoker.com>
* Copyright (C) 2007 Holger Hans Peter Freyther
* Copyright (C) 2007 Pioneer Research Center USA, Inc.
* 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 <cairo.h>
#include <wtf/MathExtras.h>
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_fontMetrics.setAscent(font_extents.ascent);
m_fontMetrics.setDescent(font_extents.descent);
// 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.
float lineSpacing = font_extents.height;
if (lineSpacing < font_extents.ascent + font_extents.descent)
lineSpacing = font_extents.ascent + font_extents.descent;
m_fontMetrics.setLineSpacing(lroundf(lineSpacing));
m_fontMetrics.setLineGap(lineSpacing - font_extents.ascent - font_extents.descent);
cairo_scaled_font_text_extents(m_platformData.m_scaledFont, "x", &text_extents);
m_fontMetrics.setXHeight(text_extents.height);
cairo_scaled_font_text_extents(m_platformData.m_scaledFont, " ", &text_extents);
m_spaceWidth = static_cast<float>(text_extents.x_advance);
m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f;
}
void SimpleFontData::platformCharWidthInit()
{
m_avgCharWidth = 0.f;
m_maxCharWidth = 0.f;
initCharWidths();
}
void SimpleFontData::platformDestroy()
{
}
PassRefPtr<SimpleFontData> SimpleFontData::createScaledFontData(const FontDescription& fontDescription, float scaleFactor) const
{
FontDescription desc = FontDescription(fontDescription);
desc.setSpecifiedSize(scaleFactor * fontDescription.computedSize());
FontPlatformData platformData(desc, desc.family().family());
return SimpleFontData::create(platformData);
}
bool SimpleFontData::containsCharacters(const UChar* characters, int length) const
{
bool result = true;
PangoCoverage* coverage = pango_font_get_coverage(m_platformData.m_font, pango_language_get_default());
for (int i = 0; i < length; i++) {
if (PANGO_COVERAGE_NONE == pango_coverage_get(coverage, characters[i])) {
result = false;
break;
}
}
pango_coverage_unref(coverage);
return result;
}
void SimpleFontData::determinePitch()
{
if (isCustomFont()) {
m_treatAsFixedPitch = false;
return;
}
m_treatAsFixedPitch = m_platformData.isFixedPitch();
}
FloatRect SimpleFontData::platformBoundsForGlyph(Glyph) const
{
return FloatRect();
}
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 width = (float)m_spaceWidth;
if (cairo_scaled_font_status(m_platformData.m_scaledFont) == CAIRO_STATUS_SUCCESS && extents.x_advance != 0)
width = (float)extents.x_advance;
return width;
}
}
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