void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const TextStyle& style, const FloatPoint& point, int from, int to) const
{
cairo_t* cr = context->platformContext();
cairo_save(cr);
PangoLayout* layout = pango_cairo_create_layout(cr);
gchar* utf8 = convertUniCharToUTF8(run.characters(), run.length(), from, run.length());
pango_layout_set_text(layout, utf8, -1);
setPangoAttributes(this, run, layout, style.rtl());
// Set the text color to use for drawing.
float red, green, blue, alpha;
Color penColor = context->fillColor();
penColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha);
cairo_move_to(cr, point.x(), point.y());
PangoLayoutLine* layoutLine = pango_layout_get_line(layout, 0);
pango_cairo_show_layout_line(cr, layoutLine);
g_free(utf8);
g_object_unref(layout);
cairo_restore(cr);
}
void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const TextStyle& style, const FloatPoint& point,
int from, int to) const
{
// This glyph buffer holds our glyphs + advances + font data for each glyph.
GlyphBuffer glyphBuffer;
float startX = point.x();
UniscribeController controller(this, run, style);
controller.advance(from);
float beforeWidth = controller.runWidthSoFar();
controller.advance(to, &glyphBuffer);
// We couldn't generate any glyphs for the run. Give up.
if (glyphBuffer.isEmpty())
return;
float afterWidth = controller.runWidthSoFar();
if (style.rtl()) {
controller.advance(run.length());
startX += controller.runWidthSoFar() - afterWidth;
} else
startX += beforeWidth;
// Draw the glyph buffer now at the starting point returned in startX.
FloatPoint startPoint(startX, point.y());
drawGlyphBuffer(context, glyphBuffer, run, style, startPoint);
}
FloatRect Font::selectionRectForComplexText(const TextRun& run, const TextStyle& style, const IntPoint& point, int h, int from, int to) const
{
FloatRect rect;
float tw;
PangoLayout* layout = getDefaultPangoLayout(run);
setPangoAttributes(this, run, layout, style.rtl());
float beforeWidth = getWidth (layout, run, 0, from);
float afterWidth = getWidth (layout, run, 0, to);
if (style.rtl()) {
float totalWidth = getWidth (layout, run, 0, run.length());
tw = totalWidth;
rect = FloatRect(point.x() + floorf(totalWidth - afterWidth), point.y(), roundf(totalWidth - beforeWidth) - floorf(totalWidth - afterWidth), h);
}
else
rect = FloatRect(point.x() + floorf(beforeWidth), point.y(), roundf(afterWidth) - floorf(beforeWidth), h);
g_object_unref(layout);
return rect;
}
int Font::offsetForPositionForComplexText(const TextRun& run, const TextStyle& style, int x, bool includePartialGlyphs) const
{
PangoLayout* layout = getDefaultPangoLayout(run);
setPangoAttributes(this, run, layout, style.rtl());
gchar* utf8 = convertUniCharToUTF8(run.characters(), run.length(), 0, run.length());
pango_layout_set_text(layout, utf8, -1);
int index, trailing;
pango_layout_xy_to_index(layout, x * PANGO_SCALE, 1, &index, &trailing);
glong offset = g_utf8_pointer_to_offset(utf8, utf8 + index);
g_object_unref(layout);
g_free(utf8);
return offset;
}
FloatRect Font::selectionRectForComplexText(const TextRun& run, const TextStyle& style, const IntPoint& point, int h,
int from, int to) const
{
UniscribeController it(this, run, style);
it.advance(from);
float beforeWidth = it.runWidthSoFar();
it.advance(to);
float afterWidth = it.runWidthSoFar();
// Using roundf() rather than ceilf() for the right edge as a compromise to ensure correct caret positioning
if (style.rtl()) {
it.advance(run.length());
float totalWidth = it.runWidthSoFar();
return FloatRect(point.x() + floorf(totalWidth - afterWidth), point.y(), roundf(totalWidth - beforeWidth) - floorf(totalWidth - afterWidth), h);
}
return FloatRect(point.x() + floorf(beforeWidth), point.y(), roundf(afterWidth) - floorf(beforeWidth), h);
}
float Font::floatWidthForComplexText(const TextRun& run, const TextStyle& style) const
{
if (run.length() == 0)
return 0.0f;
PangoLayout* layout = getDefaultPangoLayout(run);
setPangoAttributes(this, run, layout, style.rtl());
gchar* utf8 = convertUniCharToUTF8(run.characters(), run.length(), 0, run.length());
pango_layout_set_text(layout, utf8, -1);
g_free(utf8);
int layoutWidth;
pango_layout_get_size(layout, &layoutWidth, 0);
float width = (float)layoutWidth / (double)PANGO_SCALE;
g_object_unref(layout);
return width;
}