void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, int from, int to) const
{
#if defined(USE_FREETYPE)
if (!primaryFont()->platformData().m_pattern) {
drawSimpleText(context, run, point, from, to);
return;
}
#endif
cairo_t* cr = context->platformContext();
PangoLayout* layout = pango_cairo_create_layout(cr);
setPangoAttributes(this, run, layout);
gchar* utf8 = convertUniCharToUTF8(run.characters(), run.length(), 0, run.length());
pango_layout_set_text(layout, utf8, -1);
// Our layouts are single line
PangoLayoutLine* layoutLine = pango_layout_get_line_readonly(layout, 0);
// Get the region where this text will be laid out. We will use it to clip
// the Cairo context, for when we are only painting part of the text run and
// to calculate the size of the shadow buffer.
PangoRegionType partialRegion = 0;
char* start = g_utf8_offset_to_pointer(utf8, from);
char* end = g_utf8_offset_to_pointer(start, to - from);
int ranges[] = {start - utf8, end - utf8};
partialRegion = gdk_pango_layout_line_get_clip_region(layoutLine, 0, 0, ranges, 1);
drawGlyphsShadow(context, cr, point, layoutLine, partialRegion);
cairo_save(cr);
cairo_translate(cr, point.x(), point.y());
float red, green, blue, alpha;
context->fillColor().getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha);
gdk_cairo_region(cr, partialRegion);
cairo_clip(cr);
pango_cairo_show_layout_line(cr, layoutLine);
if (context->textDrawingMode() & TextModeStroke) {
Color strokeColor = context->strokeColor();
strokeColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha);
pango_cairo_layout_line_path(cr, layoutLine);
cairo_set_line_width(cr, context->strokeThickness());
cairo_stroke(cr);
}
// Pango sometimes leaves behind paths we don't want
cairo_new_path(cr);
destroyPangoRegion(partialRegion);
g_free(utf8);
g_object_unref(layout);
cairo_restore(cr);
}
void Font::drawGlyphs(GraphicsContext* context, const SimpleFontData* font, const GlyphBuffer& glyphBuffer,
int from, int numGlyphs, const FloatPoint& point) const
{
if (!font->platformData().size())
return;
GlyphBufferGlyph* glyphs = const_cast<GlyphBufferGlyph*>(glyphBuffer.glyphs(from));
float offset = point.x();
for (int i = 0; i < numGlyphs; i++) {
glyphs[i].x = offset;
glyphs[i].y = point.y();
offset += glyphBuffer.advanceAt(from + i).width();
}
PlatformContextCairo* platformContext = context->platformContext();
drawGlyphsShadow(context, point, font, glyphs, numGlyphs);
cairo_t* cr = platformContext->cr();
cairo_save(cr);
if (context->textDrawingMode() & TextModeFill) {
platformContext->prepareForFilling(context->state(), PlatformContextCairo::AdjustPatternForGlobalAlpha);
drawGlyphsToContext(cr, font, glyphs, numGlyphs);
}
// Prevent running into a long computation within cairo. If the stroke width is
// twice the size of the width of the text we will not ask cairo to stroke
// the text as even one single stroke would cover the full wdth of the text.
// See https://bugs.webkit.org/show_bug.cgi?id=33759.
if (context->textDrawingMode() & TextModeStroke && context->strokeThickness() < 2 * offset) {
platformContext->prepareForStroking(context->state());
cairo_set_line_width(cr, context->strokeThickness());
// This may disturb the CTM, but we are going to call cairo_restore soon after.
cairo_set_scaled_font(cr, font->platformData().scaledFont());
cairo_glyph_path(cr, glyphs, numGlyphs);
cairo_stroke(cr);
}
cairo_restore(cr);
}
