mirror of
https://gitlab.freedesktop.org/emersion/libliftoff.git
synced 2024-12-26 21:59:18 +01:00
57 lines
1.4 KiB
Markdown
57 lines
1.4 KiB
Markdown
# libliftoff
|
|
|
|
[](https://builds.sr.ht/~emersion/libliftoff)
|
|
|
|
Lightweight hardware composer library for libdrm.
|
|
|
|
libliftoff eases the use of KMS planes from userspace without standing in your
|
|
way. Users create "virtual planes" called layers, set KMS properties on them,
|
|
and libliftoff will allocate planes for these layers if possible.
|
|
|
|
See the [blog post introducing the project][intro-post] for more context.
|
|
|
|
## Building
|
|
|
|
Depends on libdrm. Requires universal planes and atomic.
|
|
|
|
meson build/
|
|
ninja -C build/
|
|
|
|
## Usage
|
|
|
|
See [`liftoff.h`][liftoff.h]. Here's the general idea:
|
|
|
|
```c
|
|
struct liftoff_display *display;
|
|
struct liftoff_output *output;
|
|
struct liftoff_layer *layer;
|
|
drmModeAtomicReq *req;
|
|
int ret;
|
|
|
|
display = liftoff_display_create(drm_fd);
|
|
output = liftoff_output_create(display, crtc_id);
|
|
|
|
layer = liftoff_layer_create(output);
|
|
liftoff_layer_set_property(layer, "FB_ID", fb_id);
|
|
/* Probably setup more properties and more layers */
|
|
|
|
req = drmModeAtomicAlloc();
|
|
if (!liftoff_display_apply(display, req)) {
|
|
perror("liftoff_display_apply");
|
|
exit(1);
|
|
}
|
|
|
|
ret = drmModeAtomicCommit(drm_fd, req, DRM_MODE_ATOMIC_NONBLOCK, NULL);
|
|
if (ret < 0) {
|
|
perror("drmModeAtomicCommit");
|
|
exit(1);
|
|
}
|
|
drmModeAtomicFree(req);
|
|
```
|
|
|
|
## License
|
|
|
|
MIT
|
|
|
|
[liftoff.h]: https://github.com/emersion/libliftoff/blob/master/include/libliftoff.h
|
|
[intro-post]: https://emersion.fr/blog/2019/xdc2019-wrap-up/#libliftoff
|