yuv_to_png 1.0.0

yuv_to_png: ^1.0.0 copied to clipboard

Major Changes #

• Removed OpenCV dependency - Replaced with stb_image_write.h for PNG encoding

  • Significantly reduced APK size (~400-700 KB saved per architecture)
  • Simpler build process with zero external dependencies for PNG encoding
  • Maintained same functionality with minimal performance impact

• Migrated to libyuv for all image operations

  • Replaced OpenCV flip/rotate with libyuv's ARGBMirror and ARGBRotate
  • Fixed critical crash issues with in-place rotation
  • Added proper ARGB to RGBA conversion for correct color output
  • Eliminated blue skin color bug in PNG output

Architecture Changes #

• Improved CMake build system

  • Added automatic library download with multiple mirror fallback
  • Enhanced error handling with clear warning messages
  • Added ELF binary verification for downloaded files
  • Graceful handling of missing libraries with user guidance

• Front camera handling

  • Fixed mirror/flip logic for front-facing camera
  • Added conditional rotation (270° for front, 90° for back camera)
  • Proper horizontal flip using ARGBMirror

Dependencies #

• Removed: OpenCV (libopencv_java4.so)
• Added: stb_image_write.h (single-header library, ~50-80 KB)
• Retained: libyuv (for YUV conversion and image manipulation)

Technical Details #

• Conversion pipeline: YUV → ARGB → Mirror/Rotate → RGBA → PNG
• Uses libyuv for: Android420ToARGB, NV21ToARGB, ARGBMirror, ARGBRotate, ARGBToRGBA
• PNG encoding via stb_image_write with memory callback for std::vector<uint8_t>
• Proper memory management with separate buffers for each transformation stage

• Flutter plugin for YUV to PNG conversion
• Support for YUV420 and NV21 formats
• Camera image processing with rotation and flip
• Android-only implementation
• OpenCV-based image processing