wiki:QtBackLog

Version 3 (modified by zecke@selfish.org, 11 years ago) (diff)

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Backlog of Qt and QtWebKit problems

Qt problems

  • ARM optimized qdrawhelper is only enabled for RCVT (symbian) . The needs to be transferred to gcc inline assembly. This will optimize memfill, Source, SourceOver and some blend functions.
  • ARMv6 should be auto detected. Currently arm/armv6 can be passed as -embedded options. The benefit of ARMv6 in src/corelib is the use of atomic load and exchange, instead of the old "swap" extension. __ARCH_ARM_6__ should be used to detect it.
  • Enabled pld (preload) in qdrawhelper for ARMv5te and upwards
  • QImageReader deserves some optimatations. E.g. decode to the QImage provided to the decoder, do not parse every gif when trying to determine the size.
  • Changes to QHttpNetworkReply to reduce memory reallocations. Reserve some bytes instead of doing QByteArray::append all them time.
  • Cut down on the usage of QUrl::toEncoded as it shows up in the profile of starting jobs.

QtWebKit problems

  • Image decoder changes to greatly reduce memory and load speed. See this bug for planned changes. The possible impact is quite big.
  • TCmalloc needs to be tested. Does it make anything faster/slower? How to test memory fragmentation.
  • The fuzz testing will make QtWebKit go in infinite loops and stop working. This situation needs to be analyzed as this can be a serve reliabality problem.