clip: Rudimentary support for clip-polygon extraction

Step 1, fix the failings sighted recently by tracking clip-boxes as an
explicit property of the clipping and of composition.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/cairo-fixed-private.h b/src/cairo-fixed-private.h
index 6cecc8dc5..9a16a037b 100644
--- a/src/cairo-fixed-private.h
+++ b/src/cairo-fixed-private.h
@@ -164,6 +164,12 @@ _cairo_fixed_floor (cairo_fixed_t f)
 }
 
 static inline cairo_fixed_t
+_cairo_fixed_ceil (cairo_fixed_t f)
+{
+    return _cairo_fixed_floor (f + CAIRO_FIXED_FRAC_MASK);
+}
+
+static inline cairo_fixed_t
 _cairo_fixed_round (cairo_fixed_t f)
 {
     return _cairo_fixed_floor (f + (CAIRO_FIXED_FRAC_MASK+1)/2);