Add initial code from Vello.

.cargo/config.toml

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+[alias]
+run_wasm = "run --release --package run_wasm --"
+# Other crates use the alias run-wasm, even though crate names should use `_`s not `-`s
+# Allow this to be used
+run-wasm = "run_wasm"

.github/copyright.sh

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+#!/bin/bash
+
+# If there are new files with headers that can't match the conditions here,
+# then the files can be ignored by an additional glob argument via the -g flag.
+# For example:
+#   -g "!src/special_file.rs"
+#   -g "!src/special_directory"
+
+# Check all the standard Rust source files
+output=$(rg "^// Copyright (19|20)[\d]{2} (.+ and )?the Vello Authors( and .+)?$\n^// SPDX-License-Identifier: Apache-2\.0 OR MIT$\n\n" --files-without-match --multiline -g "*.rs" -g "!src/geom.rs" .)
+
+if [ -n "$output" ]; then
+	echo -e "The following files lack the correct copyright header:\n"
+	echo $output
+	echo -e "\n\nPlease add the following header:\n"
+	echo "// Copyright $(date +%Y) the Vello Authors"
+	echo "// SPDX-License-Identifier: Apache-2.0 OR MIT"
+	echo -e "\n... rest of the file ...\n"
+	exit 1
+fi
+
+echo "All files have correct copyright headers."
+exit 0
+

.github/workflows/ci.yml

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+env:
+  # We aim to always test with the latest stable Rust toolchain, however we pin to a specific
+  # version like 1.70. Note that we only specify MAJOR.MINOR and not PATCH so that bugfixes still
+  # come automatically. If the version specified here is no longer the latest stable version,
+  # then please feel free to submit a PR that adjusts it along with the potential clippy fixes.
+  RUST_STABLE_VER: "1.76" # In quotes because otherwise (e.g.) 1.70 would be interpreted as 1.7
+
+
+# Rationale
+#
+# We don't run clippy with --all-targets because then even --lib and --bins are compiled with
+# dev dependencies enabled, which does not match how they would be compiled by users.
+# A dev dependency might enable a feature of a regular dependency that we need, but testing
+# with --all-targets would not catch that. Thus we split --lib & --bins into a separate step.
+
+name: CI
+
+on:
+  pull_request:
+  merge_group:
+
+jobs:
+  rustfmt:
+    runs-on: ubuntu-latest
+    name: cargo fmt
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: install stable toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_STABLE_VER }}
+          components: rustfmt
+
+      - name: cargo fmt
+        run: cargo fmt --all --check
+
+      - name: install ripgrep
+        run: |
+          sudo apt update
+          sudo apt install ripgrep
+
+      - name: check copyright headers
+        run: bash .github/copyright.sh
+
+  test-stable:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        # We use macos-14 as that is an arm runner. These have the virtgpu support we need
+        os: [windows-latest, macos-14, ubuntu-latest]
+        include:
+          - os: ubuntu-latest
+            gpu: 'yes'
+          - os: macos-14
+            gpu: 'yes'
+          - os: windows-latest
+            # TODO: The windows runners theoretically have CPU fallback for GPUs, but
+            # this failed in initial testing
+            gpu: 'no'
+    name: cargo clippy + test
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: install stable toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_STABLE_VER }}
+          components: clippy
+
+      - name: restore cache
+        uses: Swatinem/rust-cache@v2
+
+      - name: Install native dependencies
+        if: matrix.os == 'ubuntu-latest'
+        run: sudo apt-get update; sudo apt-get install --no-install-recommends libasound2-dev libudev-dev
+
+      # Adapted from https://github.com/bevyengine/bevy/blob/b446374392adc70aceb92621b080d1a6cf7a7392/.github/workflows/validation-jobs.yml#L74-L79
+      - name: install xvfb, llvmpipe and lavapipe
+        if: matrix.os == 'ubuntu-latest'
+        # https://launchpad.net/~kisak/+archive/ubuntu/turtle
+        run: |
+          sudo apt-get update -y -qq
+          sudo add-apt-repository ppa:kisak/turtle -y
+          sudo apt-get update
+          sudo apt install -y xvfb libegl1-mesa libgl1-mesa-dri libxcb-xfixes0-dev mesa-vulkan-drivers
+
+      - name: cargo clippy (no default features)
+        run: cargo clippy --workspace --lib --bins --no-default-features -- -D warnings
+
+      - name: cargo clippy (no default features) (auxiliary)
+        run: cargo clippy --workspace --tests --benches --examples --no-default-features -- -D warnings
+
+      - name: cargo clippy (default features)
+        run: cargo clippy --workspace --lib --bins -- -D warnings
+
+      - name: cargo clippy (default features) (auxiliary)
+        run: cargo clippy --workspace --tests --benches --examples -- -D warnings
+
+      - name: cargo clippy (all features)
+        run: cargo clippy --workspace --lib --bins --all-features -- -D warnings
+
+      - name: cargo clippy (all features) (auxiliary)
+        run: cargo clippy --workspace --tests --benches --examples --all-features -- -D warnings
+
+      # At the time of writing, we don't have any tests. Nevertheless, it's better to still run this
+      - name: cargo test
+        run: cargo test --workspace --all-features
+        env:
+          VELLO_CI_GPU_SUPPORT: ${{ matrix.gpu }}
+
+  clippy-stable-wasm:
+    runs-on: ubuntu-latest
+    name: cargo test (wasm32)
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: restore cache
+        uses: Swatinem/rust-cache@v2
+
+      - name: install stable toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_STABLE_VER }}
+          targets: wasm32-unknown-unknown
+          components: clippy
+
+      - name: cargo clippy (wasm)
+        run: cargo clippy --all-targets --target wasm32-unknown-unknown --workspace -- -D warnings
+
+  android-stable-check:
+    runs-on: ubuntu-latest
+    name: cargo check (aarch64-android)
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: restore cache
+        uses: Swatinem/rust-cache@v2
+
+      - name: install stable toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_STABLE_VER }}
+          targets: aarch64-linux-android
+
+      - name: install cargo apk
+        run: cargo install cargo-apk
+
+      - name: cargo apk check (android)
+        run: cargo apk check -p with_winit --lib
+        env:
+          # This is a bit of a hack, but cargo apk doesn't seem to allow customising this
+          RUSTFLAGS: '-D warnings'
+
+  docs:
+    name: cargo doc
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [windows-latest, macos-latest, ubuntu-latest]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: install nightly toolchain
+        uses: dtolnay/rust-toolchain@nightly
+
+      - name: restore cache
+        uses: Swatinem/rust-cache@v2
+
+      # We test documentation using nightly to match docs.rs. This prevents potential breakages
+      - name: cargo doc
+        run: cargo doc --workspace --all-features --no-deps --document-private-items -Zunstable-options -Zrustdoc-scrape-examples

.github/workflows/pages-release.yml

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+name: Web Demo Update
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+
+jobs:
+  release-web:
+    permissions:
+      contents: read
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install | Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: wasm32-unknown-unknown
+
+      - name: Install | WASM Bindgen
+        uses: jetli/[email protected]
+        with:
+          version: 'latest'
+
+      - name: Build | WASM
+        run: cargo build -p with_winit --bin with_winit_bin --release --target wasm32-unknown-unknown
+
+      - name: Package | WASM
+        run: |
+          mkdir public
+          wasm-bindgen --target web --out-dir public target/wasm32-unknown-unknown/release/with_winit_bin.wasm --no-typescript
+          cat << EOF > public/index.html
+            <html>
+              <title>vello_svg Web Demo</title>
+              <meta content=no-cache http-equiv=Cache-control>
+              <meta content=-1 http-equiv=Expires>
+              <script type=module>import initSync from"/vello_svg/with_winit_bin.js";initSync(`/vello_svg/with_winit_bin_bg.wasm`);</script>
+              <link as=fetch crossorigin href=/vello_svg/with_winit_bin_bg.wasm rel=preload type=application/wasm>
+              <link crossorigin href=/vello_svg/with_winit_bin.js rel=modulepreload>
+              </head>
+              <body>
+                <style>
+                  body {
+                    margin: 0;
+                    padding: 0;
+                  }
+                </style>
+              </body>
+            </html>
+          EOF
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: './public'
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.gitignore

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+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+examples/assets/*
+
+# Generated by Cargo
+# will have compiled files and executables
+target/
+
+# Generated by Trunk
+dist/
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# Some people use VSCode
+/.vscode/
+
+# Some people use IntelliJ with Rust
+/.idea/
+*.iml
+
+# Some people use pre-commit
+.pre-commit-config.yaml
+.pre-commit-config.yml
+
+# Some people have Apple
+.DS_Store
+
+# Generated on wasm-pack failure
+**/unsupported.js

AUTHORS

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+# This is the list of Vello's significant contributors.
+#
+# This does not necessarily list everyone who has contributed code,
+# especially since many employees of one corporation may be contributing.
+# To see the full list of contributors, see the revision history in
+# source control.
+Google LLC
+Raph Levien
+Chad Brokaw
+Arman Uguray
+Elias Naur
+Daniel McNab
+Spencer C. Imbleau
+Bruce Mitchener
+Tatsuyuki Ishi
+Markus Siglreithmaier
+Rose Hudson
+Brian Merchant
+Matt Rice
+Kaur Kuut

Cargo.toml

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+[workspace]
+resolver = "2"
+members = ["examples/with_winit", "examples/run_wasm", "examples/scenes"]
+
+[workspace.package]
+edition = "2021"
+version = "0.1.0"
+license = "Apache-2.0 OR MIT"
+repository = "https://github.com/linebender/vello_svg"
+
+[workspace.dependencies]
+vello = "0.1"
+
+[package]
+name = "vello_svg"
+description = "An SVG integration for vello."
+categories = ["rendering", "graphics"]
+keywords = ["2d", "vector-graphics", "vello", "svg"]
+version.workspace = true
+license = "(Apache-2.0 OR MIT) AND MPL-2.0"
+edition.workspace = true
+repository.workspace = true
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies]
+vello = { workspace = true }
+usvg = "0.40"
+image = { version = "0.24", default-features = false, features = [
+  "png",
+  "jpeg",
+  "gif",
+] }
+
+
+[target.'cfg(target_arch = "wasm32")'.dev-dependencies]
+wasm-bindgen-test = "0.3"