[Development] Painting an image onto itself
thiago.macieira at intel.com
Wed Apr 11 00:52:33 CEST 2012
On terça-feira, 10 de abril de 2012 23.08.26, André Pönitz wrote:
> But I am not sure that kind of guarantee needs to be given.
> Would it be really needed in practice? How many occurences of such
> code are there in Qt/Qt Creator?
The guarantees we give change how we can optimise this code. I'll be satisfied
if we require that no single pixel is both source and destination.
I can't think anymore of a case where adjacency would cause a problem. The
source loads never cause a write back and bytes off limits must not be used.
The destination stores, if they write off-limits, they need to ensure that they
store the same value that was there before in any case.
Thiago Macieira - thiago.macieira (AT) intel.com
Software Architect - Intel Open Source Technology Center
Intel Sweden AB - Registration Number: 556189-6027
Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
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