path: Exponentially grow buffer based on populated points and ops.

Instead of simply doubling the buffer size every time we overflow a point
or an op, enlarge the buffer to fit twice the number of used points and
ops.  We expect paths to be fairly consistent in the mix of operations,
and this allows the buffer size to tune itself to actual usage and reduce
wastage.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/cairo-path-fixed-private.h b/src/cairo-path-fixed-private.h
index 4345fd53d..42e64eda3 100644
--- a/src/cairo-path-fixed-private.h
+++ b/src/cairo-path-fixed-private.h
@@ -61,9 +61,10 @@ typedef char cairo_path_op_t;
 
 typedef struct _cairo_path_buf {
     cairo_list_t link;
-    unsigned int buf_size;
     unsigned int num_ops;
+    unsigned int size_ops;
     unsigned int num_points;
+    unsigned int size_points;
 
     cairo_path_op_t *op;
     cairo_point_t *points;