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 }