59 lines
2.2 KiB
Rust
59 lines
2.2 KiB
Rust
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use shell::Buffer;
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use smithay::wayland::shm::BufferData;
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use smithay::wayland_server::protocol::wl_shm::Format;
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pub fn load_shm_buffer(data: BufferData, pool: &[u8], log: &::slog::Logger) -> Buffer {
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// ensure consistency, the SHM handler of smithay should ensure this
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debug_assert!(((data.offset + data.stride * data.height) as usize) <= pool.len());
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let mut out = Vec::with_capacity((data.width * data.height * 4) as usize);
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let offset = data.offset as usize;
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let width = data.width as usize;
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let height = data.height as usize;
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let stride = data.stride as usize;
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match data.format {
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Format::Argb8888 => {
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// TODO: this is so slooooow
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for j in 0..height {
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for i in 0..width {
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// value must be read as native endianness
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let val: u32 =
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unsafe { *(&pool[offset + j * stride + i * 4] as *const u8 as *const u32) };
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out.push(((val & 0x00FF0000) >> 16) as u8); //r
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out.push(((val & 0x0000FF00) >> 8) as u8); //g
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out.push(((val & 0x000000FF) >> 0) as u8); //b
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out.push(((val & 0xFF000000) >> 24) as u8); //a
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}
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}
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}
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Format::Xrgb8888 => {
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// TODO: this is so slooooow
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for j in 0..height {
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for i in 0..width {
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// value must be read as native endianness
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let val: u32 =
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unsafe { *(&pool[offset + j * stride + i * 4] as *const u8 as *const u32) };
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out.push(((val & 0x00FF0000) >> 16) as u8); //r
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out.push(((val & 0x0000FF00) >> 8) as u8); //g
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out.push(((val & 0x000000FF) >> 0) as u8); //b
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out.push(255); // a
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}
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}
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}
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_ => {
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error!(log, "Unsupported buffer format"; "format" => format!("{:?}", data.format));
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// fill in with black
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for _ in 0..(data.height * data.width) {
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out.extend(&[0, 0, 0, 255])
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}
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}
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}
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Buffer::Shm {
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data: out,
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size: (data.width as u32, data.height as u32),
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}
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}
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