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