One needs to translate the Gralloc buffer flags for AFBC (eg MALI_GRALLOC_INTFMT_AFBC_BASIC) to the corresponding linux kernel drm modifiers. This gets passed to libdrm via drmModeAddFB2WithModifiers.
Changes from v1:-
- Moved ConvertGrallocFormatToDrmModifiers() and IsDrmFormatRgb() from 'DrmGenericImporter' to 'HisiImporter' as suggested by Sean paul
- Check if the format is rgb and set AFBC_FORMAT_MOD_YTR only if any of the AFBC related Gralloc flags are set.
Changes from v2:-
- Changed ConvertGrallocFormatToDrmModifiers() and IsDrmFormatRgb() from 'public' to 'private' (suggested by Sean Paul)
Changes from v3:-
- Reordered the members of 'class HisiImporter'. Functions should go above member variables. (suggested by Sean Paul)
/-- Note for reviewer I was able to get this working for hikey960 with aosp/master for kernel 4.14. The libdrm headers need to be updated as the AFBC modifiers are missing in the aosp/master's external/libdrm. --/