michael.thaler at physik.tu-muenchen.de
Mon Oct 13 17:44:02 CEST 2003
> Some corrections...
> In your document, you should really talk about QUANTUM, downscale and upscale.
Yes. It still needs some reiterations;-) But I learned a lot while writing it.
> 1) The owner flag indicates if the KisPixelData owns the the actual memory
> pointer to by the QUANTUM array. If so, delete gets called on it at
> destruction time.
This is good to know. I should add this...
> 2) stride is what you have to add to get to the next line, sometimes, even if
> your KisPixelData is smaller, we have to fetch a bigger block of memory,
> hence stride takes that into account, width does not.
> So base + stride = line 2, but base + width might be line 2 or might be
> outside the memory region you requested, but still inside the paint device.
> KisTileCacheInterface, also used to help swapping, every tile would actually
> put it's data in here for easy maintance, when you lock, we actually try to
> get the data from here first, then from the swap interface.
Thanks for the explanation. This makes it clear.
> KisScopedLock, might be a bug here, don't know, haven't looked at the code in
> a while.
It is used quite often. I will look at KisScopedLock, maybe I
understand what it is for.
> What Java?
I meant that there was something like
class KisPaintDevice implements KisRenderInterface : KShared
But this is not a C++ construct, but Java...
> kis_global.h, upscale and downscale do more than nothing, again I refer you to
> the list.
In the case of 8 Bit per channel they do nothing, that's what I
meant. For 16 Bit they of course are important.
> Hey! I find KisGuide interesting :)
It is, but not if you want to understand the basics of krita;-)
> Why do you need these new functions?
Because you told me, that the dirty flag is for rendering and
valid/invalid for memory management stuff, which is actually not the
(Just ordered Effective C++;-))
We shall not cease from exploration, and the end of all our exploring
will be to arrive where we started and know the place for the first time.
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