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7265a79e46
The "restrict" keyword can be used to indicate that no other pointer will be used to access a chunk of memory while the restricted pointer is alive. If that promise is not upheld, undefined behavior is triggered. It may be difficult to ensure this property, and the property may be brittle - becoming invalid as code evolves. Just like "inline", let's just leave optimizations up to the compiler to figure out.
41 lines
1.4 KiB
C
41 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(const char code[static 3]);
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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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void generate_cvt_mode(drmModeModeInfo *mode, int hdisplay, int vdisplay,
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float vrefresh);
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// Part of match_connectors_with_crtcs
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#define UNMATCHED ((uint32_t)-1)
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/**
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* Tries to match DRM connectors with DRM CRTCs.
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*
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* conns contains an array of bitmasks describing compatible CRTCs. For
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* instance bit 0 set in an connector element means that it's compatible with
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* CRTC 0.
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*
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* prev_crtcs contains connector indices each CRTC was previously matched with,
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* or UNMATCHED.
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*
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* new_crtcs is populated with the new connector indices.
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*/
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void match_connectors_with_crtcs(size_t num_conns,
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const uint32_t conns[static num_conns],
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size_t num_crtcs, const uint32_t prev_crtcs[static num_crtcs],
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uint32_t new_crtcs[static num_crtcs]);
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#endif
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