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f0bb53c4ab
Following ideas from [1], snapshot the entire KMS state when the VT is switched away, and restore it when the VT is switched back. > Well the neat trick is that userspace doesn’t need to be able to > understand properties to save and restore them - the actual property > value transport between kernel and userspace is fully generic. That way, even if another DRM master changes a property we don't understand like CTM or HDR_OUTPUT_METADATA, we can switch it back and avoid getting garbage on screen. [1]: https://blog.ffwll.ch/2016/01/vt-switching-with-atomic-modeset.html
43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
#ifndef BACKEND_DRM_UTIL_H
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#define BACKEND_DRM_UTIL_H
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#include <stdint.h>
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#include <xf86drm.h>
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#include <xf86drmMode.h>
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struct wlr_drm_connector;
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// Calculates a more accurate refresh rate (mHz) than what mode itself provides
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int32_t calculate_refresh_rate(const drmModeModeInfo *mode);
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enum wlr_output_mode_aspect_ratio get_picture_aspect_ratio(const drmModeModeInfo *mode);
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// Returns manufacturer based on pnp id
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const char *get_pnp_manufacturer(uint16_t code);
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// Populates the make/model/phys_{width,height} of output from the edid data
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void parse_edid(struct wlr_drm_connector *conn, size_t len, const uint8_t *data);
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const char *drm_connector_status_str(drmModeConnection status);
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drmModeAtomicReq *snapshot_drm_state(int drm_fd);
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// Part of match_obj
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enum {
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UNMATCHED = (uint32_t)-1,
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SKIP = (uint32_t)-2,
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};
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/*
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* Tries to match some DRM objects with some other DRM resource.
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* e.g. Match CRTCs with Encoders, CRTCs with Planes.
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*
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* objs contains a bit array which resources it can be matched with.
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* e.g. Bit 0 set means can be matched with res[0]
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*
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* res contains an index of which objs it is matched with or UNMATCHED.
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*
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* This solution is left in out.
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* Returns the total number of matched solutions.
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*/
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size_t match_obj(size_t num_objs, const uint32_t objs[static restrict num_objs],
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size_t num_res, const uint32_t res[static restrict num_res],
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uint32_t out[static restrict num_res]);
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#endif
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