initHEADmaster

1 files changed, 75 insertions, 0 deletions

diff --git a/src/canvas/wayland/window/shm.cpp b/src/canvas/wayland/window/shm.cpp
new file mode 100644
index 0000000..461267d
--- /dev/null
+++ b/src/canvas/wayland/window/shm.cpp
@@ -0,0 +1,75 @@
+// 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);
+    }
+}