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72389ed5a8
- FrameScreenshot now carries PNG bytes instead of raw RGBA (PROTOCOL_VERSION 1→2); add a shared `encode_png` helper behind a new `png` feature so the live plugin and the kittest harness encode frames identically. - Make the protocol module unconditional: drop the `protocol` feature flag and the optional serde/serde_bytes/rmp-serde deps it gated. - plugin.rs: re-stamp screenshot-bearing frames with the current step (so inspectors waiting for step > prev don't reject them) and pump a tail-side repaint while awaiting the GPU readback.
22 lines
1015 B
Rust
22 lines
1015 B
Rust
//! Shared screenshot PNG encoder.
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//!
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//! Both peers — the live [`crate::InspectionPlugin`] and `egui_kittest`'s harness inspector
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//! — encode their frames here so they produce identically-encoded
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//! [`crate::protocol::FrameScreenshot`]s.
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/// Encode tightly-packed RGBA8 pixels (`width * height * 4` bytes) as PNG using `image`'s
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/// default settings (`CompressionType::Default` + `FilterType::Adaptive`).
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///
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/// PNG keeps high-resolution captures off the hot path of socket throughput — a 1550×2114
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/// RGBA8 buffer is ~13 MiB raw but typically <1 MiB encoded.
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///
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/// # Errors
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/// When the encoder fails (e.g. the buffer length doesn't match `width * height * 4`).
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pub fn encode_png(width: u32, height: u32, rgba: &[u8]) -> Result<Vec<u8>, image::ImageError> {
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use image::ImageEncoder as _;
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let mut out = std::io::Cursor::new(Vec::new());
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image::codecs::png::PngEncoder::new(&mut out)
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.write_image(rgba, width, height, image::ExtendedColorType::Rgba8)?;
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Ok(out.into_inner())
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}
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