[HarfBuzz] question about Mongolian text render

[aron]

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2014-11-28 17:28 GMT+09:00 aron <aronsoyol at gmail.com>:

> Hi
> I use the latest version of HarfBuzz as a static library in VisualStudio,
> The Mongolian string can't be rendered as I expected in my program
> but rendered correctly in sh-view.exe. Could anyone tell me where is wrong
> in my program.
>
> I found that the vaule -- glyph_info[i].codepoint is less than real glyph
> index, the difference is always 87 in my case.What is the correct way to
> get glyph index?
>
> ​void HBDrawText(HDC dc, int x, int y)
> {
> const char * fontFilePath  = "./MongolianWhite.ttf";
> const wchar_t * text   = L"ᠺᠣᠮᠫᠢᠦ᠋ᠲ᠋ᠧᠷ";//Mongolian string for render
>
>
> FT_Library ft_library;
> FT_Face ft_face;
>
> FT_Init_FreeType(&ft_library); /* initialize library */
> FT_New_Face(ft_library, fontFilePath, 0, &ft_face); /* create face object
> */
> FT_Set_Pixel_Sizes(ft_face, 0, 40); /* set character size */
>
> hb_font_t * font = hb_ft_font_create(ft_face, NULL);
> hb_buffer_t * buffer= hb_buffer_create();;
>
> //
> //set buffer
> //
> hb_buffer_add_utf16(buffer, (uint16_t *)text, lstrlen(text), 0, -1);
> hb_buffer_set_direction(buffer, HB_DIRECTION_TTB); /* or LTR */
> hb_buffer_set_script(buffer, HB_SCRIPT_MONGOLIAN); /* see hb-unicode.h */
> hb_buffer_guess_segment_properties(buffer);
> //
> //
> //
> hb_shape(font, buffer, NULL, 0);
>
> int  glyph_count = hb_buffer_get_length(buffer);
> hb_glyph_info_t * glyph_info = hb_buffer_get_glyph_infos(buffer, 0);
>
> WCHAR dbg_info[6];
> int pen_x = x;
> int yBaseLine = y;
> int glyphPosX = 0;
> int glyphPosY = 0;
>
> for (int i = 0; i < glyph_count; ++i)
> {
> FT_UInt glyph_index  = glyph_info[i].codepoint;
> FT_Load_Glyph(ft_face, glyph_index, FT_LOAD_DEFAULT);
>  wsprintf(dbg_info, L"%d,", glyph_index + 87);//*why + 87?*
> OutputDebugString(dbg_info);
>
> /* convert to an anti-aliased bitmap */
> FT_Render_Glyph(ft_face->glyph, FT_RENDER_MODE_NORMAL);
>
> FreeTypeDrawBitmap(dc, &ft_face->glyph->bitmap, pen_x +
> ft_face->glyph->bitmap_left,
> yBaseLine - ft_face->glyph->bitmap_top);
> pen_x += ft_face->glyph->advance.x >> 6;
> }
> hb_buffer_destroy(buffer);
> hb_font_destroy(font);
> FT_Done_Face(ft_face);
> FT_Done_FreeType(ft_library);
> }
>
> this is the glyph index list generated by this program(incorrect).
> 769,660,566,487,675,490,705
> hb-shape' s output(correct) is:
>  [769|660|566|484|678|492|705]
>
>
> --
> Aron
>



-- 
Aron
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