422ee4515d
This means we'll get warnings whenever a floating point value looses precision, e.g. gets implicitly casted to an integer. It also warns when implicitly casting double's to float's, which arguably is less of a problem, but there are no warning for just float/double to int. This would have caught https://gitlab.gnome.org/GNOME/mutter/-/issues/3530. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3822>
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/*
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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, see <http://www.gnu.org/licenses/>.
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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 <glib.h>
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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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double numerator;
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double denominator;
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if (drm_mode->htotal <= 0 || drm_mode->vtotal <= 0)
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return 0.0;
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numerator = drm_mode->clock * 1000.0;
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denominator = (double) drm_mode->vtotal * drm_mode->htotal;
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if (drm_mode->vscan > 1)
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denominator *= drm_mode->vscan;
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return (float) (numerator / denominator);
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}
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int64_t
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meta_calculate_drm_mode_vblank_duration_us (const drmModeModeInfo *drm_mode)
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{
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int64_t value;
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if (drm_mode->htotal <= 0 || drm_mode->vtotal <= 0)
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return 0;
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/* Convert to int64_t early. */
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value = drm_mode->vtotal - drm_mode->vdisplay;
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value *= drm_mode->htotal;
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if (drm_mode->flags & DRM_MODE_FLAG_DBLSCAN)
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value *= 2;
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/* Round the duration up as it is used for buffer swap deadline computation. */
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value = (value * 1000 + drm_mode->clock - 1) / drm_mode->clock;
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return value;
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}
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