SimpleFontDataPango.cpp [plain text]
#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_ascent = static_cast<int>(lroundf(font_extents.ascent));
m_descent = static_cast<int>(lroundf(font_extents.descent));
m_lineSpacing = static_cast<int>(lroundf(font_extents.height));
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<float>(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.setSpecifiedSize(0.70f * fontDescription.computedSize());
FontPlatformData platformData(desc, desc.family().family());
m_smallCapsFontData = new SimpleFontData(platformData);
}
return m_smallCapsFontData;
}
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;
}
}