Add HEIC output format for iOS images - #16
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Research findings for iOS HEIC image export: - Xcode asset catalogs support HEIC since Xcode 10.1 - Apple ImageIO provides native encoding on macOS (not Linux) - libheif is cross-platform but has GPL licensing (x265) - Recommended: Phase 1 with macOS-only ImageIO approach
Add HEIC encoding support for iOS image exports using native ImageIO. HEIC provides ~40-50% smaller file sizes than PNG while maintaining full transparency support. - Add NativeHeicEncoder for RGBA → HEIC encoding (macOS only) - Add SvgToHeicConverter for SVG → HEIC pipeline via resvg - Add HeicConverter for batch PNG → HEIC conversion - Support both lossy and lossless encoding modes with quality control - Gracefully fall back to PNG on Linux with warning - Update Xcode asset catalog export to reference .heic files - Add outputFormat and heicOptions config parameters for iOS images
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Description
Adds HEIC as an optional output format for iOS image exports, providing ~40-50% smaller file sizes compared to PNG while maintaining transparency support. Uses native ImageIO framework on macOS with automatic PNG fallback on Linux.
NativeHeicEncoderusing Apple ImageIO for HEIC encodingSvgToHeicConverterfor SVG source with HEIC output (best quality)HeicConverterfor PNG to HEIC batch conversionoutputFormat: heicandheicOptionsconfiguration in Params