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);
TEXTMETRIC textMetrics;
GetTextMetrics(dc, &textMetrics);
float ascent = textMetrics.tmAscent * metricsMultiplier;
float descent = textMetrics.tmDescent * metricsMultiplier;
float lineGap = textMetrics.tmExternalLeading * metricsMultiplier;
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);
float xHeight = -extents.y_bearing;
m_fontMetrics.setXHeight(xHeight);
cairo_win32_scaled_font_done_font(scaledFont);
m_scriptCache = 0;
m_scriptFontProperties = 0;
RestoreDC(dc, -1);
}
void Font::determinePitch()
{
if (origin() == Origin::Remote) {
m_treatAsFixedPitch = false;
return;
}
HWndDC dc(0);
SaveDC(dc);
SelectObject(dc, m_platformData.hfont());
TEXTMETRIC tm;
GetTextMetrics(dc, &tm);
m_treatAsFixedPitch = !(tm.tmPitchAndFamily & TMPF_FIXED_PITCH);
RestoreDC(dc, -1);
}
bool Font::platformSupportsCodePoint(UChar32 character, Optional<UChar32> variation) const
{
return variation ? false : glyphForCharacter(character);
}
}