Hi,Uli thank you.cairo_show_glyphs() works,can display english words correctly. but Asian fonts(Chinese, Japanese and Korean), how to, anyidea? I tried FT_Select_Charmap( face, FT_ENCODING_UNICODE ), details as below, 1. init FT_Library library; FT_Face freetype_face; cairo_font_face_t *cairo_face; cairo_glyph_t glyph; FT_Init_FreeType(&library); FT_New_Face(library, "/usr/share/fonts/simhei.ttf", 0, &freetype_face); cairo_face = (cairo_font_face_t *) cairo_ft_font_face_create_for_ft_face( freetype_face, 0); cairo_t *cr; cairo_surface_t * surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 390, 400); cr = cairo_create(surface); cairo_set_font_face(cr, cairo_face); cairo_set_font_size(cr, TEXT_SIZE); cairo_set_source_rgb(cr, 1.0, 1.0, 1.0); cairo_paint(cr); cairo_set_source_rgb(cr,0, 0, 1.0); 2. try draw on cairo_t void draw(cairo_t *cr, int width, int height) { glyph_array_t glyphs; glyph_array_init(&glyphs, 1, TEXT_SIZE); glyph_array_add_text(&glyphs, cr, "English", 0.0); glyph_array_rel_move_to(&glyphs, TEXT_SIZE * 1.5, 0.0); glyph_array_add_text(&glyphs, cr, "中文", 0.0); glyph_array_show(&glyphs, cr); } 3. glyph_array_add_text void glyph_array_add_text(glyph_array_t *glyphs, cairo_t *cr, const char *s, double spacing) { cairo_scaled_font_t *scaled_font; cairo_status_t status; FT_Face face; unsigned long charcode; unsigned int index; cairo_text_extents_t extents; const char *p; FT_Vector kerning; double kern_x; int first = true; scaled_font = cairo_get_scaled_font(cr); status = cairo_scaled_font_status(scaled_font); face = cairo_ft_scaled_font_lock_face(scaled_font); FT_Select_Charmap( face, FT_ENCODING_UNICODE ); FT_Set_Char_Size(face, 16 << 6, 16 << 6, 300, 300); p = s; while (*p) { charcode = *p; index = FT_Get_Char_Index(face, charcode); glyphs->glyph_list[glyphs->num_glyphs].index = index; if (first) { first = false; glyphs->glyph_list[glyphs->num_glyphs].x = glyphs->x; glyphs->glyph_list[glyphs->num_glyphs].y = glyphs->y; } else { cairo_glyph_extents(cr, &glyphs->glyph_list[glyphs->num_glyphs - 1], 1, &extents); FT_Get_Kerning(face, glyphs->glyph_list[glyphs->num_glyphs - 1].index, glyphs->glyph_list[glyphs->num_glyphs].index, FT_KERNING_UNSCALED, &kerning); kern_x = DOUBLE_FROM_26_6(kerning.x); glyphs->glyph_list[glyphs->num_glyphs].x = glyphs->glyph_list[glyphs->num_glyphs - 1].x + extents.x_advance + kern_x + spacing; glyphs->glyph_list[glyphs->num_glyphs].y = glyphs->glyph_list[glyphs->num_glyphs - 1].y + extents.y_advance; } cairo_glyph_extents(cr, &glyphs->glyph_list[glyphs->num_glyphs], 1, &extents); glyphs->x = glyphs->glyph_list[glyphs->num_glyphs].x + extents.x_advance + spacing; glyphs->y = glyphs->glyph_list[glyphs->num_glyphs].y + extents.y_advance; p++; glyphs->num_glyphs++; } cairo_ft_scaled_font_unlock_face(scaled_font); } 4. glyph_array_show void glyph_array_show(glyph_array_t *glyphs, cairo_t *cr) { cairo_show_glyphs(cr, glyphs->glyph_list, glyphs->num_glyphs); } Thanks Wei <div class="gmail_quote"> 2012/6/4 Uli Schlachter <<a href="mailto:psychon@znc.in" target="_blank">psychon@znc.in</a>> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Hi,<div><div> On 04.06.2012 09:57, Jihe Wei wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> When we try to show text with multi-language, like Asian fonts(Chinese, Japanese and Korean). But can't display them except some squares. also <a href="http://blog.vlad1.com/2007/12/11/graphics-in-mozilla/" target="_blank">http://blog.vlad1.com/2007/12/11/graphics-in-mozilla/</a> says "The toy font API that’s present in Cairo can be ignored, as it does not support international text and is there only for convenience for smaller projects." so what's your opinion? </blockquote> </div></div> So let's first make it clear what said toy font API is: cairo_show_text() and cairo_select_font_face() What should applications use instead? The docs point at cairo_show_glyphs() / cairo_show_text_glyphs() and font-backend specific functions like e.g. cairo_ft_font_face_create_for_pattern(). However, for these APIs, you are rendering glyphs instead of a text. Converting your text into glyphs is something that cairo does not do for you (unless you use the toy text API). If you want a solution that should work everywhere, you should take a look at Pango[0]. With PangoCairo, you can make Pango draw to a cairo_t and thus continue using cairo. Pango will convert your text to glyphs and use the non-toy API for doing its job. Hopefully this helped. Uli [0] <a href="http://www.pango.org" target="_blank">http://www.pango.org</a> </blockquote></div>