If a cursor file contains multiple images for the same size, this
typically indicates an animation. The compositor weston uses
wl_cursor_frame_and_duration to figure out at which time a specific image
should be shown.
The total delay is the sum of all image delays. But if all images have a
delay of 0, the total delay is 0 as well. The code does not check for this
special condition and triggers a floating point exception by eventually
performing a modulo operation with 0.
This, of course, could also happen if the sum of all image delays
triggers an unsigned int overflow. But since a comment in the code
already indicates that it does not try to "fix" handling of weird files,
I would argue that it's "okay" if that happens. At least the program
won't crash.
Proof of Concept:
install -D ~/.icons/poc/cursors
base64 -d > ~/.icons/poc/cursors/left_ptr << EOF
WGN1chAAAAAAAAEAAgAAAAIA/f8BAAAAKAAAAAIA/f8BAAAAKAAAACQAAAACAP3/AQAAAAEAAAAB
AAAAAQAAAAEAAAABAAAAAAAAAAAAAAA=
EOF
cat > /tmp/weston.ini << EOF
[shell]
cursor-theme=poc
EOF
weston -c /tmp/weston.ini
Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
Some headers and source files have been using types such as uint32_t
without explicitly including stdint.h.
Explicitly include stdint.h where appropriate.
Signed-off-by: Yong Bakos <ybakos@humanoriented.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
It's useful to know how long the current cursor frame should be displayed
so we can wait that long to change it.
Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
If posix_fallocate is available, use it to detect when we are running
out of buffer space.
Propagate the failure properly through the various functions, stopping
loading cursors but keeping the cursors that were already successfully
loaded.
This may result in an animated cursor not having all of its images, or a
cursor theme not having all of its cursors. When that happens, the
failure is NOT communicated to the application. Instead, the application
will get NULL from wl_cursor_theme_get_cursor() for a cursor that was
not loaded successfully. If an animated cursor is missing only some
images, the animation is truncated but the cursor is still available.
This patch relies on the commit "os: use posix_fallocate in creating
sharable buffers" for defining HAVE_POSIX_FALLOCATE.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Exporting unprefixed symbols is a pretty bad idea so don't do that.
Instea of redefining it WL_ARRAY_LENGTH, we just move the define to
our private header. The scanner generates code that uses ARRAY_LENGTH,
but we can just make it count the number elements and emit an integer
constant instead.
This theme is loaded when the specified cursor theme can not be found.
These cursors are extracted from the xorg sources and transformed into
raw ARGB data by a small helper program (commited separately).
- don't leak fd in shm_pool_destroy()
- return NULL from wl_cursor_theme_load() if pool fails
Tha last one fixes a segfault, when shm_pool_create() has failed.
Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>
Copy the implementation of os_create_anonymous_file() here from weston,
so we can use it instead of hardcoding a path to /tmp.
Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>
Defining a list of all cursors a theme, client or toolkit should have
is not the purpose of libwayland-cursor. The cursor type enum existed
for making lookups faster, but this kind of optmization belongs in the
toolkits.
The purpose of this library is to be the equivalent of libXcursor in
the X world. This library is compatible with X cursor themes and loads
them directly into an shm pool making it easy for the clients to get
buffer for each cursor image.
The code for handling the X cursor theme was taken from libXcursor. The
files cursor/xcursor.[ch] are a stripped down version of that library
containing only the interfaces necessary for implementing the wayland
counterpart.
