QTransform m. img.transformed(m).copy() will create one copy. But:
QTransform m. m.rotate(10); img.transformed(m).copy() will copy image twice; On embedded device, if you do some video decoding it is a problem :) 2016-07-11 12:52 GMT+01:00 Giuseppe D'Angelo <dange...@gmail.com>: > On Mon, Jul 11, 2016 at 1:40 PM, Tomasz Olszak <olszak.tom...@gmail.com> > wrote: > > The problem here is that you can't say if transformed returns shallow or > > deep copy. Result depends on argument value. Of course the transform > > returning shallow copy on identity matrix is nice but should be > documented > > somewhere. After reading docs I expected deep copy like from copy > function. > > But maybe it's only me :) > > Then always deep copy and then move on with the processing? Because > relying on shallow copies is a bit of a gamble -- by the same > reasoning, can you be sure that setPixel(x, y, color) always detaches? > What if it gets implemented in a way that first checks if the pixel > already has that color, and if so, it doesn't do anything? > > -- > Giuseppe D'Angelo >
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