Module process 

Image processing and responsive image generation.

Stage 2 of the Simple Gal build pipeline. Takes the manifest from the scan stage and processes all images to generate responsive sizes and thumbnails.

Dependencies

Uses the pure Rust imaging backend — no external dependencies required.

Output Formats

For each source image, generates:

• Responsive images: Multiple sizes in AVIF format
• Thumbnails: Fixed aspect ratio crops for gallery grids

Default Configuration

Responsive sizes: 800px, 1400px, 2080px (on the longer edge)
Quality: 90%
Thumbnail aspect: 4:5 (portrait)
Thumbnail size: 400px (on the short edge)

Output Structure

processed/
├── manifest.json              # Updated manifest with generated paths
├── 010-Landscapes/
│   ├── 001-dawn-800.avif      # Responsive sizes
│   ├── 001-dawn-1400.avif
│   ├── 001-dawn-2080.avif
│   └── 001-dawn-thumb.avif    # 4:5 center-cropped thumbnail
└── ...

Structs

GeneratedVariant

InputAlbum

InputImage

InputManifest

Input manifest (from scan stage)

OutputAlbum

OutputImage

OutputManifest

Output manifest (after processing)

ProcessConfig

Configuration for image processing

ProcessResult

Process result containing the output manifest and cache statistics.

VariantInfo

Information about a single processed variant (for progress reporting).

Enums

ProcessError

ProcessEvent

Progress events emitted during image processing.

VariantStatus

Cache outcome for a single processed variant (for progress reporting).

Functions

process

process_with_backend

Process images using a specific backend (allows testing with mock).