//TextExtents reports the extents for s.
//The extents describe a user-space rectangle that encloses the "inked" portion
//of the text, as it would be drawn with ShownText.
//Additionally, the x_advance and y_advance values indicate the amount by which
//the current point would be advanced by ShowText.
//
//Note that whitespace characters do not directly contribute to the size
//of the rectangle (extents.Width and extents.Height), but they do contribute
//indirectly by changing the position of non-whitespace characters.
//In particular, trailing whitespace characters are likely to not affect
//the size of the rectangle, though they will affect the AdvanceX and AdvanceY
//values.
//
//Originally cairo_text_extents.
func (c *Context) TextExtents(s string) TextExtents {
var t C.cairo_text_extents_t
cs := C.CString(s)
C.cairo_text_extents(c.c, cs, &t)
C.free(unsafe.Pointer(cs))
return XtensionNewTextExtents(t)
}
func (v *Context) TextExtents(utf8 string) TextExtents {
cstr := C.CString(utf8)
defer C.free(unsafe.Pointer(cstr))
var extents C.cairo_text_extents_t
C.cairo_text_extents(v.native(), (*C.char)(cstr), &extents)
return TextExtents{
XBearing: float64(extents.x_bearing),
YBearing: float64(extents.y_bearing),
Width: float64(extents.width),
Height: float64(extents.height),
XAdvance: float64(extents.x_advance),
YAdvance: float64(extents.y_advance),
}
}
func (self *Surface) TextExtents(text string) *TextExtents {
cte := C.cairo_text_extents_t{}
cs := C.CString(text)
C.cairo_text_extents(self.context, cs, &cte)
C.free(unsafe.Pointer(cs))
te := &TextExtents{
Xbearing: float64(cte.x_bearing),
Ybearing: float64(cte.y_bearing),
Width: float64(cte.width),
Height: float64(cte.height),
Xadvance: float64(cte.x_advance),
Yadvance: float64(cte.y_advance),
}
return te
}
func (self *Surface) GetTextExtents(text string) *GTextExtents {
p := C.CString(text)
e := new(TextExtents)
C.cairo_text_extents(self.context, p, &(e.extents))
C.free(unsafe.Pointer(p))
r := new(GTextExtents)
r.XBearing = float64(e.extents.x_bearing)
r.YBearing = float64(e.extents.y_bearing)
r.Width = float64(e.extents.width)
r.Height = float64(e.extents.height)
r.XAdvance = float64(e.extents.x_advance)
r.YAdvance = float64(e.extents.y_advance)
return r
}
// void cairo_text_extents (cairo_t *cr, const char *utf8, cairo_text_extents_t *extents);
func (self *Surface) TextExtents(utf8 string, extents *TextExtents) {
C.cairo_text_extents(self.context, C.CString(utf8), (*C.cairo_text_extents_t)(unsafe.Pointer(extents)))
}