wlroots/backend/drm/drm-legacy.c

#include <gbm.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <wlr/util/log.h>
#include "backend/drm.h"
#include "backend/drm-util.h"

static bool legacy_crtc_pageflip(struct wlr_backend_state *drm, struct wlr_output_state *output,
		struct wlr_drm_crtc *crtc, uint32_t fb_id, drmModeModeInfo *mode) {
	if (mode) {
		drmModeSetCrtc(drm->fd, crtc->id, fb_id, 0, 0,
			&output->connector, 1, mode);
	}

	drmModePageFlip(drm->fd, crtc->id, fb_id, DRM_MODE_PAGE_FLIP_EVENT, output);

	return true;
}

static void legacy_conn_enable(struct wlr_backend_state *drm, struct wlr_output_state *output,
		bool enable) {
	drmModeConnectorSetProperty(drm->fd, output->connector, output->props.dpms,
		enable ? DRM_MODE_DPMS_ON : DRM_MODE_DPMS_OFF);
}

bool legacy_crtc_set_cursor(struct wlr_backend_state *drm, struct wlr_drm_crtc *crtc,
		struct gbm_bo *bo) {
	if (!crtc || !crtc->cursor) {
		return true;
	}

	if (!bo) {
		drmModeSetCursor(drm->fd, crtc->id, 0, 0, 0);
		return true;
	}

	struct wlr_drm_plane *plane = crtc->cursor;

	if (drmModeSetCursor(drm->fd, crtc->id, gbm_bo_get_handle(bo).u32,
			plane->width, plane->height)) {
		wlr_log_errno(L_ERROR, "Failed to set hardware cursor");
		return false;
	}

	return true;
}

bool legacy_crtc_move_cursor(struct wlr_backend_state *drm, struct wlr_drm_crtc *crtc,
		int x, int y) {
	return !drmModeMoveCursor(drm->fd, crtc->id, x, y);
}

const struct wlr_drm_interface legacy_iface = {
	.conn_enable = legacy_conn_enable,
	.crtc_pageflip = legacy_crtc_pageflip,
	.crtc_set_cursor = legacy_crtc_set_cursor,
	.crtc_move_cursor = legacy_crtc_move_cursor,
};