WebP Format & libwebp Integration Skill (wlframe/C Style)

When to Apply

Use this skill when implementing, integrating, or reviewing WebP read/write C code in wlframe, especially in image/, buffer/, or related modules, or when using libwebp for WebP parsing/generation.

WebP Format Essentials

• WebP is a modern image format supporting lossy and lossless compression, alpha, animation.
• File is RIFF-based, starts with 'RIFF' and 'WEBP' signatures.
• Supports VP8 (lossy), VP8L (lossless), VP8X (extended), alpha, ICC profile, EXIF, XMP.

libwebp Integration & API Design

• Use official libwebp (https://github.com/webmproject/libwebp).
• Typical workflow:
  1. Use WebPDecode* or WebPEncode* APIs for decoding/encoding.
  2. Set up input/output (file or memory).
  3. Convert pixel data to/from wlframe's internal format as needed.
  4. Release all allocated resources.
• API prefix: wlf_webp_. Use init/create and finish/destroy patterns.
• Struct layout: hot fields first, group pointers/handles/flags, hide implementation details via impl pointer.