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