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78bfe61554
- the .so contract and deb assertions no longer pipe into grep. under `set -o pipefail`, `producer | grep -q` reports a FALSE FAILURE once the producer outruns the 64 KB pipe buffer: grep -q exits at the first match, the producer dies on SIGPIPE, and pipefail makes that the pipeline's status - so a library that HAS the symbol is reported as missing it and the step fails on a good build. measured on a real EGL-enabled .so (101 KB of strings, both markers present): the piped form reported both missing. this was introduced by the strictness fix two rounds ago and only passes today because a release-sized .so fits in the buffer. NOTE the obvious repair does not work either - materializing the output and piping the variable keeps the pipe and fails identically (measured), so these now match with bash's own pattern operator and no subprocess at all. verified with positive and negative controls. - warm_availability decides X11 for itself, inside its retry loop, with the UNMEMOISED `scrap::is_x11()`. this is the same one-shot-at -startup bug the pre-warm had, in its sibling call site, left behind when that one was fixed: the check ran during startup, where loginctl cannot yet name the seat0 session and the answer defaults to "x11", so a Wayland host that came up slowly skipped the warm for the life of the process and got back the cold-probe "No displays" symptom the warm exists to remove. the memoised form would have moved the bug rather than fixed it, since it latches its first answer. - the grab_desc SAFETY comment says what the frame protocol actually is instead of promising a release on every return path: traced in the C, a failing grab_desc leaves nothing to release (-EINVAL returns before allocating, a failed inner grab has already cleaned up, and -ENOTSUP releases the frame itself), so releasing on those paths would be a double free.
Derived from https://github.com/quadrupleslap/scrap
scrap
Scrap records your screen! At least it does if you're on Windows, macOS, or Linux.
Usage
[dependencies]
scrap = "0.5"
Its API is as simple as it gets!
struct Display; /// A screen.
struct Frame; /// An array of the pixels that were on-screen.
struct Capturer; /// A recording instance.
impl Capturer {
/// Begin recording.
pub fn new(display: Display) -> io::Result<Capturer>;
/// Try to get a frame.
/// Returns WouldBlock if it's not ready yet.
pub fn frame<'a>(&'a mut self) -> io::Result<Frame<'a>>;
pub fn width(&self) -> usize;
pub fn height(&self) -> usize;
}
impl Display {
/// The primary screen.
pub fn primary() -> io::Result<Display>;
/// All the screens.
pub fn all() -> io::Result<Vec<Display>>;
pub fn width(&self) -> usize;
pub fn height(&self) -> usize;
}
impl<'a> ops::Deref for Frame<'a> {
/// A frame is just an array of bytes.
type Target = [u8];
}
The Frame Format
- The frame format is guaranteed to be packed BGRA.
- The width and height are guaranteed to remain constant.
- The stride might be greater than the width, and it may also vary between frames.
System Requirements
| OS | Minimum Requirements |
|---|---|
| macOS | macOS 10.8 |
| Linux | XCB + SHM + RandR |
| Windows | DirectX 11.1 |