- properly pass on color format in simplified JPEG encoder interface
- add alternative write-callback-style encoding mode
also add encode example variant which uses write-callback style output
- add support for "fake grayscale mode" in encoders
this is done by using I420 internally and filling the U and V planes
with 0x80 bytes
- make sure JPEG quantization table is copied in standardized zig zag order
the VPU does not, so this has to be done explicitely
Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org> Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
