float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
if (m_platformData.useGDI())
return widthForGDIGlyph(glyph);
if (!m_platformData.size())
return 0;
HDC hdc = GetDC(0);
SaveDC(hdc);
cairo_scaled_font_t* scaledFont = m_platformData.scaledFont();
cairo_win32_scaled_font_select_font(scaledFont, hdc);
int width;
GetCharWidthI(hdc, glyph, 1, 0, &width);
cairo_win32_scaled_font_done_font(scaledFont);
RestoreDC(hdc, -1);
ReleaseDC(0, hdc);
const double metricsMultiplier = cairo_win32_scaled_font_get_metrics_factor(scaledFont) * m_platformData.size();
return width * metricsMultiplier;
}
static double
pango_cairo_win32_font_get_metrics_factor (PangoFont *font)
{
PangoWin32Font *win32font = PANGO_WIN32_FONT (font);
cairo_scaled_font_t *scaled_font = pango_cairo_win32_font_get_scaled_font (PANGO_CAIRO_FONT (font));
return cairo_win32_scaled_font_get_metrics_factor (scaled_font) * win32font->size;
}
void SimpleFontData::platformInit()
{
m_scriptCache = 0;
m_scriptFontProperties = 0;
m_isSystemFont = false;
m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f;
if (m_platformData.useGDI())
return initGDIFont();
HDC hdc = GetDC(0);
SaveDC(hdc);
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, hdc);
TEXTMETRIC textMetrics;
GetTextMetrics(hdc, &textMetrics);
float ascent = textMetrics.tmAscent * metricsMultiplier;
float descent = textMetrics.tmDescent * metricsMultiplier;
float xHeight = ascent * 0.56f; // Best guess for xHeight for non-Truetype fonts.
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;
OUTLINETEXTMETRIC metrics;
if (GetOutlineTextMetrics(hdc, sizeof(metrics), &metrics) > 0) {
// This is a TrueType font. We might be able to get an accurate xHeight
GLYPHMETRICS gm;
MAT2 mat = { 1, 0, 0, 1 };
DWORD len = GetGlyphOutline(hdc, 'x', GGO_METRICS, &gm, 0, 0, &mat);
if (len != GDI_ERROR && gm.gmptGlyphOrigin.y > 0)
xHeight = gm.gmptGlyphOrigin.y * metricsMultiplier;
}
m_fontMetrics.setXHeight(xHeight);
cairo_win32_scaled_font_done_font(scaledFont);
m_isSystemFont = false;
m_scriptCache = 0;
m_scriptFontProperties = 0;
RestoreDC(hdc, -1);
ReleaseDC(0, hdc);
}
void Font::platformInit()
{
m_syntheticBoldOffset = m_platformData.syntheticBold() ? 1.0f : 0.f;
m_scriptCache = 0;
m_scriptFontProperties = 0;
m_isSystemFont = false;
if (m_platformData.useGDI())
return initGDIFont();
if (!m_platformData.size()) {
m_fontMetrics.reset();
m_avgCharWidth = 0;
m_maxCharWidth = 0;
m_isSystemFont = false;
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 xHeight = ascent * 0.56f; // Best guess for xHeight for non-Truetype fonts.
float lineGap = textMetrics.tmExternalLeading * metricsMultiplier;
int faceLength = ::GetTextFace(dc, 0, 0);
Vector<WCHAR> faceName(faceLength);
::GetTextFace(dc, faceLength, faceName.data());
m_isSystemFont = !wcscmp(faceName.data(), L"Lucida Grande");
ascent = ascentConsideringMacAscentHack(faceName.data(), ascent, descent);
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);
}
