isa/mutter
1
0
Fork 0
mirror of https://github.com/brl/mutter.git synced 2024-11-26 10:00:45 -05:00
Code Issues Packages Projects Releases Wiki Activity

Bug 1195 - ClutterBehaviourBspline only works for very short paths

Browse Source 
* clutter/clutter-behaviour-bspline.c: Changed the CBZ_T_POW3 and
        CBZ_T_MUL functions so that they preserve more of the least
        significant bits. This fixes some of the jaggy behaviour with
        longer paths.
This commit is contained in:
Neil Roberts 2008-10-20 09:43:12 +00:00
parent 8f1819cd52
commit 49192f60b6
2 changed files with 16 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
ChangeLog
View File

@ -1,3 +1,12 @@
2008-10-20 Neil Roberts <neil@linux.intel.com>
Bug 1195 - ClutterBehaviourBspline only works for very short paths
* clutter/clutter-behaviour-bspline.c: Changed the CBZ_T_POW3 and
CBZ_T_MUL functions so that they preserve more of the least
significant bits. This fixes some of the jaggy behaviour with
longer paths.
2008-10-17 Thomas Wood <thomas@linux.intel.com>
reviewed by: Emmanuele Bassi <ebassi@linux.intel.com>

12
clutter/clutter-behaviour-bspline.c
View File

@ -68,14 +68,16 @@
****************************************************************************/
/*
* The t parameter of the bezier is from interval <0,1>, so we use
* 14.18 fixed format to improve precission and simplify POW3 calculation.
* The t parameter of the bezier is from interval <0,1>, so we can use
* 14.18 format and special multiplication functions that preserve
* more of the least significant bits but would overflow if the value
* is > 1
*/
#define CBZ_T_Q 18
#define CBZ_T_ONE (1 << CBZ_T_Q)
#define CBZ_T_POW2(x) ((x >> 9) * (x >> 9))
#define CBZ_T_POW3(x) ((x >> 12) * (x >> 12) * (x >> 12))
#define CBZ_T_MUL(x,y) ((x >> 9) * (y >> 9))
#define CBZ_T_MUL(x,y) ((((x) >> 3) * ((y) >> 3)) >> 12)
#define CBZ_T_POW2(x) CBZ_T_MUL (x, x)
#define CBZ_T_POW3(x) CBZ_T_MUL (CBZ_T_POW2 (x), x)
#define CBZ_T_DIV(x,y) ((((x) << 9)/(y)) << 9)
/*