import sun.java2d.pipe.TextPipe; //导入依赖的package包/类
private TextPipe getTextPipe(SunGraphics2D sg2d, boolean aaHintIsOn) {

        /* Try to avoid calling getFontInfo() unless its needed to
         * resolve one of the new AA types.
         */
        switch (sg2d.textAntialiasHint) {
        case SunHints.INTVAL_TEXT_ANTIALIAS_DEFAULT:
            if (aaHintIsOn) {
                return aaTextRenderer;
            } else {
                return solidTextRenderer;
            }
        case SunHints.INTVAL_TEXT_ANTIALIAS_OFF:
            return solidTextRenderer;

        case SunHints.INTVAL_TEXT_ANTIALIAS_ON:
            return aaTextRenderer;

        default:
            switch (sg2d.getFontInfo().aaHint) {

            case SunHints.INTVAL_TEXT_ANTIALIAS_LCD_HRGB:
            case SunHints.INTVAL_TEXT_ANTIALIAS_LCD_VRGB:
                return lcdTextRenderer;

            case SunHints.INTVAL_TEXT_ANTIALIAS_ON:
                return aaTextRenderer;

            case SunHints.INTVAL_TEXT_ANTIALIAS_OFF:
                return solidTextRenderer;

                 /* This should not be reached as the FontInfo will
                 * always explicitly set its hint value. So whilst
                 * this could be collapsed to returning say just
                 * solidTextRenderer, or even removed, its left
                 * here in case DEFAULT is ever passed in.
                 */
            default:
                if (aaHintIsOn) {
                    return aaTextRenderer;
                } else {
                    return solidTextRenderer;
                }
            }
        }
    }