[Development] Regarding qmlcachegen and qml bytecode compression

[Fatih Uzunoğlu]

Hello,

I could not find a reference if `qmlcachegen` compresses (and relevant 
part in `qtdeclarative` then decompresses) the QML bytecode it 
generates. My understanding is that the bytecode is embedded to the C++ 
file it generates (in addition to the limited QML to C++ compilation), 
and this is outside the resource system (which uses compression by default).

If this is the case, unlike `qsb` where shader bytecode would be subject 
to regular compression through the resource system, QML bytecode would 
not be compressed at all.

My question is that, does `qmlcachegen` compress the bytecode before it 
is embedded in the generated C++ source file? If not, is there a plan to 
do that or a reason not to do that?

Thanks in advance for the answer,
Fatih Uzunoğlu

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