[ft-devel] FT_Glyphslot_Embolden is broken at sometimes.

[sunmoon1997]

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hi,
    FT_Glyphslot_Embolden works at most of time, but sometimes it
doesn't(see attachment). To run the testcase, you need simsun.ttc
from windows.  Any comments?

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#include <cairo.h>

#define WIDTH 350
#define HEIGHT 100
#define TEXT "惊"

int main() {
        cairo_surface_t * sr;
        cairo_t * cr;
        cairo_text_extents_t extents;
        double y = 0;
        
        sr = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,  WIDTH, HEIGHT);
        cr = cairo_create (sr);

        cairo_select_font_face (cr, "simsun",
                                CAIRO_FONT_SLANT_NORMAL,
                                CAIRO_FONT_WEIGHT_NORMAL);
        cairo_set_font_size (cr, 48.0);
        
        cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
        cairo_paint(cr);

        cairo_set_source_rgb (cr, 0, 0, 1.0);   
        cairo_text_extents (cr, TEXT, &extents);
        cairo_move_to (cr, -extents.x_bearing, y - extents.y_bearing);
        cairo_show_text (cr, TEXT);

        /* require bold style */
        cairo_select_font_face (cr, "simsun",
                                CAIRO_FONT_SLANT_NORMAL,
                                CAIRO_FONT_WEIGHT_BOLD);

        /* cairo will call FT_GlyphSlot_Embolden */
        y += extents.height + 2.0;
        cairo_text_extents (cr, TEXT, &extents);
        cairo_move_to (cr, -extents.x_bearing, y - extents.y_bearing);
        cairo_show_text (cr, TEXT);

        cairo_set_line_width (cr, 0.5);
        cairo_set_source_rgb (cr, 0, 0, 0);
        cairo_set_font_size (cr, 48.0);
        
        /* outline */
        cairo_move_to (cr, 80, 80);
        cairo_text_path (cr, TEXT);
        cairo_stroke (cr);

        /* regular style */
        cairo_select_font_face (cr, "simsun",
                                CAIRO_FONT_SLANT_NORMAL,
                                CAIRO_FONT_WEIGHT_NORMAL);
        cairo_move_to (cr, 140, 80);
        cairo_text_path (cr, TEXT);
        cairo_stroke (cr);

        cairo_move_to (cr, 200, 80);
        cairo_text_path (cr, TEXT);
        cairo_fill (cr);

        cairo_surface_write_to_png (sr, "ft-glyphslot-embolden-broken.png");

        cairo_destroy (cr);
        cairo_surface_destroy (sr);

        return 0;
}