IMGU_GDC_LUT_MASK
u32 val0 = imgu_css_gdc_lut[0][i] & IMGU_GDC_LUT_MASK;
u32 val1 = imgu_css_gdc_lut[1][i] & IMGU_GDC_LUT_MASK;
u32 val2 = imgu_css_gdc_lut[2][i] & IMGU_GDC_LUT_MASK;
u32 val3 = imgu_css_gdc_lut[3][i] & IMGU_GDC_LUT_MASK;