[ft] Render 16x16 font, ASCII is gray, but CJK is Mono

[Charles Wang]

Hi,

    Using FT Lib which version is 2.2.1.

    ************* Code start ****************   
    error = FT_New_Face(library, "SimHei.ttf", 0, &face);
    error = FT_Select_Charmap(face, FT_ENCODING_UNICODE); 
    error = FT_Set_Char_Size(face,  16 << 6, 16 << 6,   96,   96);   
    error = FT_Set_Pixel_Sizes(face,  16,  16); 
    error = FT_Load_Char(face, uwCode, FT_LOAD_RENDER);
    ************* Code end ****************   

The render is OK, I can draw the font correctly, BUT,
If I render a ASCII (uwCode = 'A' ) , face->glyph->bitmap.pixel_mode = 2
If I render a CJK char (a Chinese charactor, unicode), face->glyph->
bitmap.pixel_mode
 = 1

If I set the font size to 22x22, or bigger, then display CJK charactor,   face->glyph->bitmap.pixel_mode = 2

Request:
I just want to render CJK charactor (unicode) which pixel mode is GRAY.

But now if I render small size font (less than 22x22), the pixel mode is always MONO  

Thanks and Regards
Charles