Kontron KTAM3874-pITX - Manual (Page 157)

KTD-S0057-I Page 153 Linux® Programming Examples (DebianTM)
KTAM3874/pITX Software Guide
XAllocNamedColor (sys.disp, sys.cmap, OBJ2_COL1, &col, &col);
cairo_set_source_rgb (cr, RGB_R (C(col)), RGB_G (C(col)), RGB_B (C(col)));
cairo_stroke (cr);
cairo_move_to (cr, x_off - extents->x_bearing, y_off - extents->y_bearing);
XAllocNamedColor (sys.disp, sys.cmap, OBJ2_COL2, &col, &col);
cairo_set_source_rgb (cr, RGB_R (C(col)), RGB_G (C(col)), RGB_B (C(col)));
cairo_show_text (cr, text);
cairo_restore (cr);
}
}
static void draw_cairo_object1 (XSystem sys, cairo_t *cr)
{
cairo_text_extents_t
extents;
cairo_font_options_t *font_options;
const char text[] = "cairo";
int x_off, y_off;
cairo_matrix_t m;
cairo_save (cr);
cairo_select_font_face (cr, "Sans", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size (cr, TEXT_SIZE);
font_options = cairo_font_options_create ();
cairo_get_font_options (cr, font_options);
cairo_font_options_set_hint_metrics (font_options, CAIRO_HINT_METRICS_OFF);
cairo_set_font_options (cr, font_options);
cairo_font_options_destroy (font_options);
cairo_translate (cr, TEXT_WIDTH / 2.0, TEXT_HEIGHT / 2.0);
cairo_text_extents (cr, text, &extents);
x_off = floor (0.5 + (extents.height + 1.0) / (2.0 * tan (M_PI / (double) NUM_TEXT)));
y_off = -floor (0.5 + extents.height / 2.0);
cairo_save (cr);
cairo_matrix_init_identity (&m);
draw_quadrant (sys, cr, text, &extents, &m, x_off, y_off);
cairo_matrix_init (&m, 0.0, 1.0, -1.0, 0.0, 0.0, 0.0);
draw_quadrant (sys, cr, text, &extents, &m, x_off, y_off);
cairo_restore (cr);
cairo_save (cr);
cairo_scale (cr, -1.0, -1.0);
cairo_matrix_init_identity (&m);
draw_quadrant (sys, cr, text, &extents, &m, x_off, y_off);
cairo_matrix_init (&m, 0.0, 1.0, -1.0, 0.0, 0.0, 0.0);
draw_quadrant (sys, cr, text, &extents, &m, x_off, y_off);
cairo_restore (cr);
cairo_restore (cr);
}