[Mesa-stable] [PATCH] wayland/egl: Resize EGL surface on update buffer for swrast

[Olivier Fourdan]

After commit a9fb331ea ("wayland/egl: update surface size on window
resize"), the surface size is updated as soon as the resize is done, and
`update_buffers()` would resize only if the surface size differs from
the attached size.

However, in the case of swrast, there is no resize callback and the
attached size is updated in `dri2_wl_swrast_commit_backbuffer()` prior
to the `swrast_update_buffers()` so the attached size is always up to
date when it reaches `swrast_update_buffers()` and the surface is never
resized.

This can be observed with "totem" using the GDK backend on Wayland (the
default) when running on software rendering:

  $ LIBGL_ALWAYS_SOFTWARE=true CLUTTER_BACKEND=gdk totem

Resizing the window would leave the EGL surface size unchanged.

To avoid the issue, partially revert the part of commit a9fb331ea for
`swrast_update_buffers()` and resize on the win size and not the
attached size.

Fixes: a9fb331ea - wayland/egl: update surface size on window resize
Signed-off-by: Olivier Fourdan <ofourdan at redhat.com>
CC: Daniel Stone <daniel at fooishbar.org>
CC: Juan A. Suarez Romero <jasuarez at igalia.com>
CC: mesa-stable at lists.freedesktop.org
---
 Resending because I got the "mesa-dev" address wrong! And a reply to the
 previous email won't fly with patchwork... Sorry! 

 src/egl/drivers/dri2/platform_wayland.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/egl/drivers/dri2/platform_wayland.c b/src/egl/drivers/dri2/platform_wayland.c
index 03a3e0993b..69a51e64fd 100644
--- a/src/egl/drivers/dri2/platform_wayland.c
+++ b/src/egl/drivers/dri2/platform_wayland.c
@@ -1652,8 +1652,8 @@ swrast_update_buffers(struct dri2_egl_surface *dri2_surf)
    if (dri2_surf->back)
       return 0;
 
-   if (dri2_surf->base.Width != dri2_surf->wl_win->attached_width ||
-       dri2_surf->base.Height != dri2_surf->wl_win->attached_height) {
+   if (dri2_surf->base.Width != dri2_surf->wl_win->width ||
+       dri2_surf->base.Height != dri2_surf->wl_win->height) {
 
       dri2_wl_release_buffers(dri2_surf);
 
-- 
2.19.1