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