1# Android differences from upstream chromium 2 3Android builds with `C_ARITH_CODING_SUPPORTED` and `D_ARITH_CODING_SUPPORTED`, 4added in 5https://android-review.googlesource.com/c/platform/external/libjpeg-turbo/+/291407/ 6to support a variant of jpeg files using arithmetic (instead of Huffman) 7encoding. This variant isn't often used because of a lack of support in many 8viewers (e.g. Chromium), but Android really values backwards compatibility, and 9this might break some users. Android probably only needs to keep 10`D_ARITH_CODING_SUPPORTED`, but vendor code might also be encoding by setting 11jpeg_compress_struct.arith_code to true, so we enable both to ensure full 12backwards compatibility since it's not really costing us anything. 13We `#define` these in jconfig.h rather than in Android.bp so that they're 14correctly exported to any *users* (in particular, jerror.h only conditionally 15defines the corresponding error codes if these `#define`s are present). 16