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Skip layer debug early
If the verbosity is low we can skip logging layer information early and do not
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example Replace liftoff_device_apply with liftoff_output_apply 2019-11-24 18:13:40 +01:00
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list.c Rename library to liftoff 2019-09-12 11:40:21 +03:00
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meson.build build: install public header file 2020-01-27 11:04:52 +01:00
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plane.c Remove chatty debug log 2019-12-12 23:26:05 +01:00
README.md Replace liftoff_device_apply with liftoff_output_apply 2019-11-24 18:13:40 +01:00

libliftoff

builds.sr.ht status

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 for more context.

Building

Depends on libdrm. Requires universal planes and atomic.

meson build/
ninja -C build/

Usage

See liftoff.h. Here's the general idea:

struct liftoff_device *device;
struct liftoff_output *output;
struct liftoff_layer *layer;
drmModeAtomicReq *req;
int ret;

device = liftoff_device_create(drm_fd);
output = liftoff_output_create(device, 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_output_apply(output, req)) {
	perror("liftoff_output_apply");
	exit(1);
}

ret = drmModeAtomicCommit(drm_fd, req, DRM_MODE_ATOMIC_NONBLOCK, NULL);
if (ret < 0) {
	perror("drmModeAtomicCommit");
	exit(1);
}
drmModeAtomicFree(req);

License

MIT