egui overlay to replace the UI

egui-tiny-skia/Cargo.toml

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+[package]
+name = "egui-tiny-skia"
+version = "0.1.0"
+edition.workspace = true
+rust-version.workspace = true
+repository.workspace = true
+license.workspace = true
+
+[dependencies]
+egui = { version = "0.33", default-features = false, features = ["default_fonts"] }
+tiny-skia = "0.11"

egui-tiny-skia/README.md

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+# egui-tiny-skia
+
+A small, platform-agnostic `egui` backend that renders into a `tiny-skia`
+`Pixmap`.
+
+This crate is intended for OpenZT UI experiments where the integration layer can
+copy pixels into the game window. The pixmap is cleared to solid magenta before
+each paint call so the Windows integration can treat untouched pixels as a
+chroma-key transparent color.
+
+## Current scope
+
+- Owns an `egui::Context`, a `tiny_skia::Pixmap`, and a CPU texture store.
+- Applies egui texture deltas.
+- Tessellates egui shapes into clipped mesh primitives.
+- Rasterizes mesh triangles on the CPU with vertex color, texture sampling, and
+  alpha blending.
+- Handles `Primitive::Callback` as a no-op.
+
+Text is rendered through egui's normal font atlas texture path. There is no
+separate `fontdue` glyph pipeline at the moment.
+
+## Run tests
+
+From the workspace root:
+
+```bash
+cargo test --manifest-path egui-tiny-skia/Cargo.toml
+```
+
+## Render PNG example
+
+From the workspace root:
+
+```bash
+cargo run --manifest-path egui-tiny-skia/Cargo.toml --example render_png
+```
+
+The example writes:
+
+```text
+egui-tiny-skia/target/egui-tiny-skia-render.png
+```
+