42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
// somebar - dwl bar
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// See LICENSE file for copyright and license details.
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#include <sys/mman.h>
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#include <unistd.h>
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#include "shm_buffer.hpp"
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#include "common.hpp"
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constexpr int n = 2;
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ShmBuffer::ShmBuffer(int w, int h, wl_shm_format format)
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: width(w)
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, height(h)
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, stride(w*4)
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{
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auto oneSize = stride*h;
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_totalSize = oneSize * n;
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auto fd = memfd_create("wl_shm", MFD_CLOEXEC);
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ftruncate(fd, _totalSize);
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auto pool = wl_shm_create_pool(shm, fd, _totalSize);
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auto ptr = reinterpret_cast<uint8_t*>(mmap(nullptr, _totalSize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0));
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close(fd);
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for (auto i=0; i<n; i++) {
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auto offset = oneSize*i;
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auto buffer = wl_shm_pool_create_buffer(pool, offset, width, height, stride, format);
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_buffers[i] = { ptr+offset, buffer };
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}
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wl_shm_pool_destroy(pool);
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}
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ShmBuffer::~ShmBuffer()
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{
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munmap(_buffers[0].data, _totalSize);
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for (auto i=0; i<n; i++) {
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wl_buffer_destroy(_buffers[i].buffer);
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}
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}
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uint8_t* ShmBuffer::data() const { return _buffers[_current].data; }
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wl_buffer* ShmBuffer::buffer() const { return _buffers[_current].buffer; }
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void ShmBuffer::flip() { _current = 1-_current; }
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