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geometry: Avoid sign issues when interpolating

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Width and height in ClutterGeometry are unsigned, and this might lead to
overflow and wrap around issues.
This commit is contained in:
Emmanuele Bassi 2010-12-17 13:53:28 +00:00
parent c3313726f0
commit 6c244c0549
1 changed files with 6 additions and 2 deletions
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8
clutter/clutter-actor.c
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@ -9244,12 +9244,16 @@ clutter_geometry_progress (const GValue *a,
const ClutterGeometry *a_geom = g_value_get_boxed (a); const ClutterGeometry *a_geom = g_value_get_boxed (a);
const ClutterGeometry *b_geom = g_value_get_boxed (b); const ClutterGeometry *b_geom = g_value_get_boxed (b);
ClutterGeometry res = { 0, }; ClutterGeometry res = { 0, };
gint a_width = a_geom->width;
gint b_width = b_geom->width;
gint a_height = a_geom->height;
gint b_height = b_geom->height;
res.x = a_geom->x + (b_geom->x - a_geom->x) * progress; res.x = a_geom->x + (b_geom->x - a_geom->x) * progress;
res.y = a_geom->y + (b_geom->y - a_geom->y) * progress; res.y = a_geom->y + (b_geom->y - a_geom->y) * progress;
res.width = a_geom->width + (b_geom->width - a_geom->width) * progress; res.width = a_width + (b_width - a_width) * progress;
res.height = a_geom->height + (b_geom->height - a_geom->height) * progress; res.height = a_height + (b_height - a_height) * progress;
g_value_set_boxed (retval, &res); g_value_set_boxed (retval, &res);