Add sanity checking feature configury.

Add sanity checking feature.
Add sanity checking.
Add prototypes.
New functions.
New function.
Use fixed functions. (_cairo_gstate_clip): Arithmetic fixes. (_cairo_gstate_clip_and_composite_trapezoids): (_cairo_gstate_show_surface): (_cairo_gstate_show_text): (_cairo_gstate_show_glyphs): Corrections to clipping.
Add XCopyArea fast path. (_cairo_xlib_surface_set_clip_region): Drive clip to drawable.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/cairo-fixed.c b/src/cairo-fixed.c
index 9a7e7bc47..2561a4ad5 100644
--- a/src/cairo-fixed.c
+++ b/src/cairo-fixed.c
@@ -51,3 +51,14 @@ _cairo_fixed_to_double (cairo_fixed_t f)
     return ((double) f) / 65536.0;
 }
 
+int
+_cairo_fixed_is_integer (cairo_fixed_t f)
+{
+    return (f & 0xFFFF) == 0;
+}
+
+int
+_cairo_fixed_integer_part (cairo_fixed_t f)
+{
+    return f >> 16;
+}