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// Display images inside a terminal
// Copyright (C) 2023 JustKidding
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
#include "shm.hpp"
#include "util.hpp"
#include "util/ptr.hpp"
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fmt/format.h>
#include <cerrno>
#include <system_error>
WaylandShm::WaylandShm(int width, int height, int scale_factor, struct wl_shm *shm)
: shm(shm),
width(width),
height(height),
stride(width * 4),
pool_size(height * stride * scale_factor)
{
const int path_size = 32;
shm_path = fmt::format("/{}", util::generate_random_string(path_size));
create_shm_file();
allocate_pool_buffers();
}
void WaylandShm::create_shm_file()
{
fd = memfd_create("ueberzugpp-shm", 0);
if (fd == -1) {
throw std::system_error(errno, std::system_category());
}
int res = ftruncate(fd, pool_size);
if (res == -1) {
throw std::system_error(errno, std::system_category());
}
auto *pool_ptr = mmap(nullptr, pool_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (pool_ptr == MAP_FAILED) {
throw std::system_error(errno, std::system_category());
}
pool_data = static_cast<uint8_t *>(pool_ptr);
}
void WaylandShm::allocate_pool_buffers()
{
const auto pool = c_unique_ptr<struct wl_shm_pool, wl_shm_pool_destroy>{wl_shm_create_pool(shm, fd, pool_size)};
buffer = wl_shm_pool_create_buffer(pool.get(), 0, width, height, stride, WL_SHM_FORMAT_ARGB8888);
}
WaylandShm::~WaylandShm()
{
shm_unlink(shm_path.c_str());
close(fd);
munmap(pool_data, pool_size);
if (buffer != nullptr) {
wl_buffer_destroy(buffer);
}
}
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