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https://github.com/brl/mutter.git
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84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
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/*
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* Copyright (C) 2013-2019 Red Hat
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* Copyright (c) 2018 DisplayLink (UK) Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#include "config.h"
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#include "backends/native/meta-kms-utils.h"
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#include <drm_fourcc.h>
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#include <glib.h>
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/* added in libdrm 2.4.95 */
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#ifndef DRM_FORMAT_INVALID
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#define DRM_FORMAT_INVALID 0
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#endif
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float
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meta_calculate_drm_mode_refresh_rate (const drmModeModeInfo *drm_mode)
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{
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float refresh = 0.0;
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if (drm_mode->htotal > 0 && drm_mode->vtotal > 0)
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{
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/* Calculate refresh rate in milliHz first for extra precision. */
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refresh = (drm_mode->clock * 1000000LL) / drm_mode->htotal;
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refresh += (drm_mode->vtotal / 2);
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refresh /= drm_mode->vtotal;
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if (drm_mode->vscan > 1)
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refresh /= drm_mode->vscan;
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refresh /= 1000.0;
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}
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return refresh;
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}
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/**
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* meta_drm_format_to_string:
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* @tmp: temporary buffer
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* @drm_format: DRM fourcc pixel format
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*
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* Returns a pointer to a string naming the given pixel format,
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* usually a pointer to the temporary buffer but not always.
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* Invalid formats may return nonsense names.
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*
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* When calling this, allocate one MetaDrmFormatBuf on the stack to
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* be used as the temporary buffer.
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*/
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const char *
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meta_drm_format_to_string (MetaDrmFormatBuf *tmp,
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uint32_t drm_format)
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{
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int i;
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if (drm_format == DRM_FORMAT_INVALID)
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return "INVALID";
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G_STATIC_ASSERT (sizeof (tmp->s) == 5);
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for (i = 0; i < 4; i++)
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{
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char c = (drm_format >> (i * 8)) & 0xff;
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tmp->s[i] = g_ascii_isgraph (c) ? c : '.';
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}
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tmp->s[i] = 0;
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return tmp->s;
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}
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