Expose _cairo_null_surface_create() via a test surface

Using a null surface is a convenient method to measure the overhead of the
performance testing framework, so export it although as a test-surface so
that it will only be available in development builds and not pollute
distributed libraries.

1 files changed, 51 insertions, 5 deletions

diff --git a/src/cairo-analysis-surface.c b/src/cairo-analysis-surface.c
index c767d07c4..b0cc54c1d 100644
--- a/src/cairo-analysis-surface.c
+++ b/src/cairo-analysis-surface.c
@@ -875,6 +875,12 @@ typedef cairo_int_status_t
 (*_set_clip_region_func)	(void			*surface,
 				 cairo_region_t		*region);
 typedef cairo_int_status_t
+(*_intersect_clip_path_func)	(void			*dst,
+				 cairo_path_fixed_t	*path,
+				 cairo_fill_rule_t	fill_rule,
+				 double			tolerance,
+				 cairo_antialias_t	antialias);
+typedef cairo_int_status_t
 (*_paint_func)			(void			*surface,
 			         cairo_operator_t	 op,
 				 const cairo_pattern_t	*source,
@@ -919,10 +925,50 @@ typedef cairo_int_status_t
 				 int			*remaining_glyphs,
 				 cairo_rectangle_int_t  *extents);
 
+typedef cairo_int_status_t
+(*_show_text_glyphs_func)	(void			    *surface,
+				 cairo_operator_t	     op,
+				 const cairo_pattern_t	    *source,
+				 const char		    *utf8,
+				 int			     utf8_len,
+				 cairo_glyph_t		    *glyphs,
+				 int			     num_glyphs,
+				 const cairo_text_cluster_t *clusters,
+				 int			     num_clusters,
+				 cairo_text_cluster_flags_t  cluster_flags,
+				 cairo_scaled_font_t	    *scaled_font,
+				 cairo_rectangle_int_t	    *extents);
+
+static cairo_surface_t *
+_cairo_null_surface_create_similar (void *other,
+				    cairo_content_t content,
+				    int width, int height)
+{
+    return _cairo_null_surface_create (content);
+}
+
+static cairo_int_status_t
+_cairo_null_surface_get_extents (void *surface,
+				 cairo_rectangle_int_t *extents)
+{
+    extents->x = 0;
+    extents->y = 0;
+    extents->width = 0;
+    extents->height = 0;
+
+    return CAIRO_STATUS_SUCCESS;
+}
+
+static cairo_bool_t
+_cairo_null_surface_has_show_text_glyphs (void *surface)
+{
+    return TRUE;
+}
+
 static const cairo_surface_backend_t cairo_null_surface_backend = {
     CAIRO_INTERNAL_SURFACE_TYPE_NULL,
 
-    NULL, /* create_similar */
+    _cairo_null_surface_create_similar,
     NULL, /* finish */
     NULL, /* acquire_source_image */
     NULL, /* release_source_image */
@@ -937,8 +983,8 @@ static const cairo_surface_backend_t cairo_null_surface_backend = {
     NULL, /* copy_page */
     NULL, /* show_page */
     (_set_clip_region_func) _return_success, /* set_clip_region */
-    NULL, /* intersect_clip_path */
-    NULL, /* get_extents */
+    (_intersect_clip_path_func) _return_success, /* intersect_clip_path */
+    _cairo_null_surface_get_extents,
     NULL, /* old_show_glyphs */
     NULL, /* get_font_options */
     NULL, /* flush */
@@ -956,8 +1002,8 @@ static const cairo_surface_backend_t cairo_null_surface_backend = {
     NULL, /* fill_stroke */
     NULL, /* create_solid_pattern_surface */
     NULL, /* can_repaint_solid_pattern_surface */
-    NULL, /* has_show_text_glyphs */
-    NULL  /* show_text_glyphs */
+    _cairo_null_surface_has_show_text_glyphs,
+    (_show_text_glyphs_func) _return_success,    /* show_text_glyphs */
 };
 
 cairo_surface_t *