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72 lines
2.2 KiB
72 lines
2.2 KiB
4 months ago
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/*
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* Copyright (c) 2016 - 2017, The Linux Foundation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <unistd.h>
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#include <math.h>
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#include <utils/sys.h>
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#include <utils/utils.h>
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#include <algorithm>
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#define __CLASS__ "Utils"
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namespace sdm {
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float gcd(float a, float b) {
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if (a < b) {
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std::swap(a, b);
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}
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while (b != 0) {
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float tmp = b;
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b = fmodf(a, b);
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a = tmp;
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}
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return a;
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}
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float lcm(float a, float b) {
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return (a * b) / gcd(a, b);
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}
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void CloseFd(int *fd) {
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if (*fd >= 0) {
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Sys::close_(*fd);
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*fd = -1;
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}
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}
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DriverType GetDriverType() {
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const char *fb_caps = "/sys/devices/virtual/graphics/fb0/mdp/caps";
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// 0 - File exists
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return Sys::access_(fb_caps, F_OK) ? DriverType::DRM : DriverType::FB;
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}
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} // namespace sdm
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