1 files changed, 45 insertions, 0 deletions
diff --git a/wm/somebar/src/shm_buffer.hpp b/wm/somebar/src/shm_buffer.hpp
new file mode 100644
index 0000000..f6927dd
--- /dev/null
+++ b/wm/somebar/src/shm_buffer.hpp
@@ -0,0 +1,45 @@
+// somebar - dwl bar
+// See LICENSE file for copyright and license details.
+
+#pragma once
+#include <array>
+#include <sys/mman.h>
+#include <wayland-client.h>
+#include "common.hpp"
+
+class MemoryMapping {
+	void* _ptr {nullptr};
+	size_t _size {0};
+public:
+	MemoryMapping() { }
+	explicit MemoryMapping(void* ptr, size_t size) : _ptr(ptr), _size(size) { }
+	MemoryMapping(const MemoryMapping&) = delete;
+	MemoryMapping(MemoryMapping&& other) { swap(other); }
+	MemoryMapping& operator=(const MemoryMapping& other) = delete;
+	MemoryMapping& operator=(MemoryMapping&& other) { swap(other); return *this; }
+	~MemoryMapping() { if (_ptr) munmap(_ptr, _size); }
+	void swap(MemoryMapping &other) {
+		using std::swap;
+		swap(_ptr, other._ptr);
+		swap(_size, other._size);
+	}
+};
+
+// double buffered shm
+// format is must be 32-bit
+class ShmBuffer {
+	struct Buf {
+		uint8_t* data {nullptr};
+		wl_unique_ptr<wl_buffer> buffer;
+	};
+	std::array<Buf, 2> _buffers;
+	int _current {0};
+	MemoryMapping _mapping;
+public:
+	const uint32_t width, height, stride;
+
+	explicit ShmBuffer(int width, int height, wl_shm_format format);
+	uint8_t* data();
+	wl_buffer* buffer();
+	void flip();
+};