SimpleFontDataCairoWin.cpp [plain text]
#include "config.h"
#include "Font.h"
#include <windows.h>
#include "FontCache.h"
#include "FontDescription.h"
#include "HWndDC.h"
#include <cairo.h>
#include <cairo-win32.h>
#include <mlang.h>
#include <wtf/MathExtras.h>
namespace WebCore {
void Font::platformInit()
{
m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f;
m_scriptCache = 0;
m_scriptFontProperties = 0;
if (m_platformData.useGDI())
return initGDIFont();
if (!m_platformData.size()) {
m_fontMetrics.reset();
m_avgCharWidth = 0;
m_maxCharWidth = 0;
m_scriptCache = 0;
m_scriptFontProperties = 0;
return;
}
HWndDC dc(0);
SaveDC(dc);
cairo_scaled_font_t* scaledFont = m_platformData.scaledFont();
const double metricsMultiplier = cairo_win32_scaled_font_get_metrics_factor(scaledFont) * m_platformData.size();
cairo_win32_scaled_font_select_font(scaledFont, dc);
OUTLINETEXTMETRIC metrics;
GetOutlineTextMetrics(dc, sizeof(metrics), &metrics);
TEXTMETRIC& textMetrics = metrics.otmTextMetrics;
float ascent, descent, lineGap;
const UINT useTypoMetricsMask = 1 << 7;
if (metrics.otmfsSelection & useTypoMetricsMask) {
ascent = metrics.otmAscent * metricsMultiplier;
descent = metrics.otmDescent * metricsMultiplier;
lineGap = metrics.otmLineGap * metricsMultiplier;
} else {
ascent = textMetrics.tmAscent * metricsMultiplier;
descent = textMetrics.tmDescent * metricsMultiplier;
lineGap = textMetrics.tmExternalLeading * metricsMultiplier;
}
float xHeight = ascent * 0.56f;
m_fontMetrics.setAscent(ascent);
m_fontMetrics.setDescent(descent);
m_fontMetrics.setLineGap(lineGap);
m_fontMetrics.setLineSpacing(lroundf(ascent) + lroundf(descent) + lroundf(lineGap));
m_avgCharWidth = textMetrics.tmAveCharWidth * metricsMultiplier;
m_maxCharWidth = textMetrics.tmMaxCharWidth * metricsMultiplier;
cairo_text_extents_t extents;
cairo_scaled_font_text_extents(scaledFont, "x", &extents);
xHeight = -extents.y_bearing;
m_fontMetrics.setXHeight(xHeight);
cairo_win32_scaled_font_done_font(scaledFont);
m_scriptCache = 0;
m_scriptFontProperties = 0;
RestoreDC(dc, -1);
}
FloatRect Font::platformBoundsForGlyph(Glyph glyph) const
{
if (m_platformData.useGDI())
return boundsForGDIGlyph(glyph);
return FloatRect();
}
float Font::platformWidthForGlyph(Glyph glyph) const
{
if (m_platformData.useGDI())
return widthForGDIGlyph(glyph);
if (!m_platformData.size())
return 0;
HWndDC dc(0);
SaveDC(dc);
cairo_scaled_font_t* scaledFont = m_platformData.scaledFont();
cairo_win32_scaled_font_select_font(scaledFont, dc);
int width;
GetCharWidthI(dc, glyph, 1, 0, &width);
cairo_win32_scaled_font_done_font(scaledFont);
RestoreDC(dc, -1);
const double metricsMultiplier = cairo_win32_scaled_font_get_metrics_factor(scaledFont) * m_platformData.size();
return width * metricsMultiplier;
}
}