compositor: drop inverse matrix from weston_transform

Remove the inverse matrix member from struct weston_transform. It is
easier (and probably faster, too) to create and store only forward
transformation matrices in a list, multiply them once, and then invert
the final matrix, rather than creating both forward and inverse
matrices, and multiplying both.

Add a stub for the 4x4 matrix inversion function.

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>

1 files changed, 0 insertions, 3 deletions

diff --git a/src/util.c b/src/util.c
index c803716..6b8477a 100644
--- a/src/util.c
+++ b/src/util.c
@@ -145,9 +145,6 @@ weston_zoom_frame(struct weston_animation *animation,
 	es->alpha = zoom->spring.current * 255;
 	if (es->alpha > 255)
 		es->alpha = 255;
-	scale = 1.0 / zoom->spring.current;
-	weston_matrix_init(&zoom->transform.inverse);
-	weston_matrix_scale(&zoom->transform.inverse, scale, scale, scale);
 
 	zoom->surface->transform.dirty = 1;