}
			} else if mask0, ok := mask.(*image.Alpha); ok {
				switch src0 := src.(type) {
				case *image.Uniform:
					drawGlyphOver(dst0, r, src0, mask0, mp)
					return
				case *image.RGBA:
					drawRGBAMaskOver(dst0, r, src0, sp, mask0, mp)
					return
				case *image.Gray:
					drawGrayMaskOver(dst0, r, src0, sp, mask0, mp)
					return
				// Case order matters. The next case (image.RGBA64Image) is an