Add cross-compilation support for Linux and Windows

- Add Docker-based build system for cross-compiling on Apple Silicon
- Create Dockerfiles for Linux x86_64 and ARM64, Windows x86_64
- Add build-all.sh script for automated multi-platform builds
- Configure cargo-deb and cargo-generate-rpm for Linux packaging
- Update README with cross-compilation instructions

Supported outputs:
- Linux x86_64: .deb, .rpm, .tar.gz
- Windows x86_64: .zip

Note: Linux ARM64 disabled due to upstream zune-jpeg NEON bug

.gitignore

@@ -1,5 +1,6 @@
 chat-summaries/
 target/
+dist/
 
 .DS_Store
 *.mp4

Cargo.toml

@@ -41,3 +41,17 @@ open = "5"
 [profile.release]
 opt-level = 3
 lto = true
+
+[package.metadata.deb]
+maintainer = "cottongin"
+copyright = "2026"
+depends = "ffmpeg"
+section = "graphics"
+# Note: cargo-deb auto-detects binary location when --target is specified
+
+[package.metadata.generate-rpm]
+assets = [
+    { source = "target/x86_64-unknown-linux-gnu/release/avif-maker", dest = "/usr/bin/avif-maker", mode = "755" }
+]
+[package.metadata.generate-rpm.requires]
+ffmpeg = "*"

Cross.toml

@@ -0,0 +1,19 @@
+[build]
+# Don't mount host's cargo/rustup - use container's toolchain
+pre-build = []
+
+[build.env]
+passthrough = ["RUST_BACKTRACE"]
+
+[target.x86_64-unknown-linux-gnu]
+image = "avif-maker-linux-x86_64"
+# Use container's Rust instead of host's
+env.volumes = []
+
+[target.aarch64-unknown-linux-gnu]
+image = "avif-maker-linux-arm64"
+env.volumes = []
+
+[target.x86_64-pc-windows-gnu]
+image = "avif-maker-windows-x86_64"
+env.volumes = []

README.md

@@ -85,6 +85,51 @@ Three test files are included:
 - `Highlander-IMustFlipSmaller-OG.gif` - Animated GIF without transparency
 - `BTS-240-art.gif` - Animated GIF with transparency (1-bit alpha)
 
+## Cross-Compilation (Build for Linux/Windows from macOS)
+
+Build distributable packages for multiple platforms from a single machine.
+
+### Prerequisites
+
+```bash
+# Install build tools
+cargo install cross cargo-deb cargo-generate-rpm
+
+# Ensure Docker Desktop is installed and running
+docker info
+```
+
+### Docker Configuration (Apple Silicon Mac)
+
+Before cross-compiling, configure Docker Desktop to share the Homebrew path:
+
+1. Open Docker Desktop
+2. Go to **Settings** → **Resources** → **File Sharing**
+3. Add `/opt/homebrew` to the shared paths
+4. Click **Apply & Restart**
+
+### Building
+
+```bash
+# First-time setup: Build Docker images
+./scripts/build-all.sh --setup-docker
+
+# Build all targets
+./scripts/build-all.sh
+```
+
+### Output
+
+After building, packages are in `dist/<version>/`:
+
+| Platform | Files | Notes |
+|----------|-------|-------|
+| Linux x86_64 | `.deb`, `.rpm`, `.tar.gz` | Cross-compiled |
+| Linux ARM64 | `.tar.gz` | Build natively on ARM64 Linux |
+| Windows x86_64 | `.zip` | Cross-compiled |
+
+**Note:** Linux ARM64 cross-compilation is disabled due to an upstream `zune-jpeg` NEON bug. Build ARM64 natively on a Linux ARM64 system.
+
 ## Architecture
 
 ```
@@ -105,6 +150,9 @@ avif-maker/
 │       ├── drop_zone.rs        # Drag-and-drop area
 │       ├── settings.rs         # Settings panel
 │       └── queue.rs            # Job queue display
+├── docker/                     # Cross-compilation Dockerfiles
+├── scripts/
+│   └── build-all.sh            # Build script for all platforms
 └── Cargo.toml
 ```
 

docker/Dockerfile.linux-arm64

@@ -0,0 +1,22 @@
+FROM --platform=linux/amd64 rust:1.85-bookworm
+
+# Install build dependencies and ARM64 cross-compiler
+RUN dpkg --add-architecture arm64 && apt-get update && apt-get install -y \
+    cmake \
+    nasm \
+    meson \
+    ninja-build \
+    gcc-aarch64-linux-gnu \
+    g++-aarch64-linux-gnu \
+    libc6-dev-arm64-cross \
+    && rm -rf /var/lib/apt/lists/*
+
+# Add the ARM64 target
+RUN rustup target add aarch64-unknown-linux-gnu
+
+# Configure cargo for cross-compilation
+ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc
+ENV CC_aarch64_unknown_linux_gnu=aarch64-linux-gnu-gcc
+ENV CXX_aarch64_unknown_linux_gnu=aarch64-linux-gnu-g++
+
+WORKDIR /build

docker/Dockerfile.linux-x86_64

@@ -0,0 +1,25 @@
+FROM --platform=linux/amd64 rust:1.85-bookworm
+
+# Install build dependencies for libavif, dav1d, and GUI
+RUN apt-get update && apt-get install -y \
+    cmake \
+    nasm \
+    meson \
+    ninja-build \
+    libx11-dev \
+    libxcursor-dev \
+    libxrandr-dev \
+    libxi-dev \
+    libgl1-mesa-dev \
+    libwayland-dev \
+    libxkbcommon-dev \
+    rpm \
+    && rm -rf /var/lib/apt/lists/*
+
+# Add the target
+RUN rustup target add x86_64-unknown-linux-gnu
+
+# Install packaging tools
+RUN cargo install cargo-deb cargo-generate-rpm
+
+WORKDIR /build

docker/Dockerfile.windows-x86_64

@@ -0,0 +1,20 @@
+FROM --platform=linux/amd64 rust:1.85-bookworm
+
+# Install build dependencies and MinGW cross-compiler
+RUN apt-get update && apt-get install -y \
+    cmake \
+    nasm \
+    meson \
+    ninja-build \
+    mingw-w64 \
+    && rm -rf /var/lib/apt/lists/*
+
+# Add the Windows target
+RUN rustup target add x86_64-pc-windows-gnu
+
+# Configure cargo for cross-compilation
+ENV CARGO_TARGET_X86_64_PC_WINDOWS_GNU_LINKER=x86_64-w64-mingw32-gcc
+ENV CC_x86_64_pc_windows_gnu=x86_64-w64-mingw32-gcc
+ENV CXX_x86_64_pc_windows_gnu=x86_64-w64-mingw32-g++
+
+WORKDIR /build

scripts/build-all.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+set -e
+
+# Cross-compilation build script for AVIF Maker
+# Uses Docker directly (not cross tool) for Apple Silicon compatibility
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
+cd "$PROJECT_DIR"
+
+VERSION=${1:-$(grep '^version' Cargo.toml | head -1 | sed 's/.*"\(.*\)".*/\1/')}
+DIST_DIR="dist/$VERSION"
+
+# Handle --setup-docker flag
+if [[ "$1" == "--setup-docker" ]]; then
+    echo "Building Docker images for cross-compilation..."
+    echo ""
+    echo "Building Linux x86_64 image..."
+    docker build --platform linux/amd64 -t avif-maker-linux-x86_64 -f docker/Dockerfile.linux-x86_64 .
+    echo ""
+    echo "Building Linux ARM64 image..."
+    docker build --platform linux/amd64 -t avif-maker-linux-arm64 -f docker/Dockerfile.linux-arm64 .
+    echo ""
+    echo "Building Windows x86_64 image..."
+    docker build --platform linux/amd64 -t avif-maker-windows-x86_64 -f docker/Dockerfile.windows-x86_64 .
+    echo ""
+    echo "Docker images built successfully!"
+    echo "You can now run: ./scripts/build-all.sh"
+    exit 0
+fi
+
+mkdir -p "$DIST_DIR"
+
+echo "Building AVIF Maker v$VERSION"
+echo "================================"
+
+# Check if Docker images exist
+if ! docker image inspect avif-maker-linux-x86_64 >/dev/null 2>&1; then
+    echo "Docker images not found. Run './scripts/build-all.sh --setup-docker' first."
+    exit 1
+fi
+
+# Linux x86_64
+echo ""
+echo "Building and packaging Linux x86_64..."
+docker run --rm --platform linux/amd64 \
+    -v "$PROJECT_DIR:/build" \
+    -w /build \
+    avif-maker-linux-x86_64 \
+    bash -c "
+        set -e
+        echo 'Compiling...'
+        cargo build --release --target x86_64-unknown-linux-gnu
+        echo 'Stripping binary...'
+        strip target/x86_64-unknown-linux-gnu/release/avif-maker
+        echo 'Creating .deb package...'
+        cargo deb --target x86_64-unknown-linux-gnu --no-build -o dist/$VERSION/
+        echo 'Creating .rpm package...'
+        cargo generate-rpm --target x86_64-unknown-linux-gnu -o dist/$VERSION/
+    "
+
+# Create tarball (can run on host)
+echo "Creating tarball..."
+tar -czvf "$DIST_DIR/avif-maker-$VERSION-linux-x86_64.tar.gz" \
+    -C target/x86_64-unknown-linux-gnu/release avif-maker
+
+# Linux ARM64  
+# NOTE: ARM64 cross-compilation is currently disabled due to upstream zune-jpeg NEON bug.
+# Build ARM64 natively on a Linux ARM64 system instead.
+echo ""
+echo "Skipping Linux ARM64 (upstream zune-jpeg bug with NEON cross-compilation)"
+echo "To build ARM64, run natively on a Linux ARM64 system."
+
+# Windows x86_64
+echo ""
+echo "Building Windows x86_64..."
+docker run --rm --platform linux/amd64 \
+    -v "$PROJECT_DIR:/build" \
+    -w /build \
+    avif-maker-windows-x86_64 \
+    cargo build --release --target x86_64-pc-windows-gnu
+
+zip -j "$DIST_DIR/avif-maker-$VERSION-windows-x86_64.zip" \
+    target/x86_64-pc-windows-gnu/release/avif-maker.exe
+
+echo ""
+echo "================================"
+echo "Build complete! Artifacts in $DIST_DIR/"
+echo ""
+ls -la "$DIST_DIR/"