SimpleFontDataCairoWin.cpp [plain text]
#include "config.h"
#include "SimpleFontData.h"
#include <windows.h>
#include "Font.h"
#include "FontCache.h"
#include "FontDescription.h"
#include <cairo.h>
#include <cairo-win32.h>
#include <mlang.h>
#include <tchar.h>
#include <wtf/MathExtras.h>
namespace WebCore {
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);
m_ascent = lroundf(textMetrics.tmAscent * metricsMultiplier);
m_descent = lroundf(textMetrics.tmDescent * metricsMultiplier);
m_xHeight = m_ascent * 0.56f; m_lineGap = lroundf(textMetrics.tmExternalLeading * metricsMultiplier);
m_lineSpacing = m_ascent + m_descent + m_lineGap;
m_avgCharWidth = lroundf(textMetrics.tmAveCharWidth * metricsMultiplier);
m_maxCharWidth = lroundf(textMetrics.tmMaxCharWidth * metricsMultiplier);
OUTLINETEXTMETRIC metrics;
if (GetOutlineTextMetrics(hdc, sizeof(metrics), &metrics) > 0) {
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)
m_xHeight = gm.gmptGlyphOrigin.y * metricsMultiplier;
}
cairo_win32_scaled_font_done_font(scaledFont);
m_isSystemFont = false;
m_scriptCache = 0;
m_scriptFontProperties = 0;
RestoreDC(hdc, -1);
ReleaseDC(0, hdc);
}
void SimpleFontData::platformCharWidthInit()
{
}
FloatRect SimpleFontData::platformBoundsForGlyph(Glyph glyph) const
{
if (m_platformData.useGDI())
return boundsForGDIGlyph(glyph);
return FloatRect();
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
if (m_platformData.useGDI())
return widthForGDIGlyph(glyph);
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;
}
}