func (t *Texture) MarkSubTexture(r splish.Rectangle) interface{} {
si := t.Src.SubImage(r.ToImage()).(*image.RGBA)
size := r.Size()
var subTex *sdl.Texture
var err error
subTex, err = t.Win.renderer.CreateTexture(
sdl.PIXELFORMAT_RGBA8888,
sdl.TEXTUREACCESS_STATIC,
int(size.X),
int(size.Y),
)
if err == nil {
err = subTex.Update(nil, unsafe.Pointer(&si.Pix), t.Src.Stride)
}
if err != nil {
return 0
}
t.Subs = append(t.Subs, subTex)
return len(t.Subs) - 1
}
