test/halo: Transformation seems key to the bug...

Only it is actually transformation of the result that is required in
order to magnify the effect to a detectable level.

test/Makefile.am

@@ -690,6 +690,11 @@ REFERENCE_IMAGES = \
 	halo.ref.png \
 	halo.image16.ref.png \
 	halo.xlib.ref.png \
+	halo.ps.ref.png \
+	halo-transform.ref.png \
+	halo-transform.image16.ref.png \
+	halo-transform.xlib.ref.png \
+	halo-transform.ps.ref.png \
 	huge-linear.image16.ref.png \
 	huge-linear.pdf.ref.png \
 	huge-linear.ps3.ref.png \

test/halo.c

@@ -35,7 +35,7 @@ halo_around_path (cairo_t *cr, const char *str)
 {
     cairo_text_path (cr, str);
 
-    cairo_set_source_rgba (cr, 0, .5, 1, .5);
+    cairo_set_source_rgb (cr, 0, .5, 1);
     cairo_stroke_preserve (cr);
     cairo_set_source_rgb (cr, 1, .5, 0);
     cairo_fill (cr);
@@ -49,7 +49,7 @@ halo_around_text (cairo_t *cr, const char *str)
     cairo_get_current_point (cr, &x, &y);
     cairo_text_path (cr, str);
 
-    cairo_set_source_rgba (cr, 0, .5, 1, .5);
+    cairo_set_source_rgb (cr, 0, .5, 1);
     cairo_stroke(cr);
 
     cairo_set_source_rgb (cr, 1, .5, 0);
@@ -68,13 +68,66 @@ draw (cairo_t *cr, int width, int height)
 
     cairo_text_extents (cr, string, &extents);
 
+    cairo_set_font_size (cr, 12);
     cairo_set_line_width (cr, 3);
     cairo_move_to (cr, 9, 4 + extents.height);
     halo_around_path (cr, string);
 
     cairo_move_to (cr, 109, 4 + extents.height);
+    halo_around_text (cr, string);
+
+    cairo_set_font_size (cr, 6);
+    cairo_set_line_width (cr, 3);
+    cairo_move_to (cr, 19 + extents.width, 20 + extents.height);
+    halo_around_path (cr, "0");
+
+    cairo_move_to (cr, 119 + extents.width, 20 + extents.height);
+    halo_around_text (cr, "0");
+
+    cairo_set_font_size (cr, 64);
+    cairo_set_line_width (cr, 10);
+    cairo_move_to (cr, 8, 70);
+    halo_around_path (cr, "6");
+    cairo_move_to (cr, 32, 90);
+    halo_around_path (cr, "7");
+
+    cairo_move_to (cr, 108, 70);
+    halo_around_text (cr, "6");
+    cairo_move_to (cr, 132, 90);
+    halo_around_text (cr, "7");
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+static cairo_test_status_t
+draw_transform (cairo_t *cr, int width, int height)
+{
+    const char *string = "0123456789";
+    cairo_text_extents_t extents;
+
+    cairo_translate (cr, 50, 50);
+    cairo_scale (cr, M_SQRT2, M_SQRT2);
+
+    cairo_set_source_rgb (cr, 1, 1, 1);
+    cairo_paint (cr);
+
+    cairo_text_extents (cr, string, &extents);
+
+    cairo_set_line_width (cr, 3);
+    cairo_move_to (cr, 9, 4 + extents.height);
     halo_around_path (cr, string);
 
+    cairo_move_to (cr, 109, 4 + extents.height);
+    halo_around_text (cr, string);
+
+    cairo_set_font_size (cr, 6);
+    cairo_set_line_width (cr, 3);
+    cairo_move_to (cr, 19 + extents.width, 20 + extents.height);
+    halo_around_path (cr, "0");
+
+    cairo_move_to (cr, 119 + extents.width, 20 + extents.height);
+    halo_around_text (cr, "0");
+
     cairo_set_font_size (cr, 64);
     cairo_set_line_width (cr, 10);
     cairo_move_to (cr, 8, 70);
@@ -96,3 +149,10 @@ CAIRO_TEST (halo,
 	    NULL, /* requirements */
 	    200, 100,
 	    NULL, draw)
+
+CAIRO_TEST (halo_transform,
+	    "Check the show_glyphs() vs glyph_path()",
+	    "text", /* keywords */
+	    NULL, /* requirements */
+	    400, 200,
+	    NULL, draw_transform)