kicad-developers team mailing list archive

[Marius Kintel <kintel@...>]

On 28. okt. 2007, at 11:13, jean-pierre charras wrote:

> In this case, the Devices Contexts are differents...
> The first DC is relative to the main draw area (the main panel), 
> and the
> second is relative to an other panel.
Even in this case, it's not allowed. I'm not 100% sure why this is 
so, but it has to do with how the drawing code is implemented 
natively. My guess is that they use hardware-accelerated drawing 
using Core Graphics (which again use OpenGL I guess). Thus all 
restrictions are related to how graphics contexts in Core Graphics 
are handled.

Note that it's _nested_ contexts that are disallowed, not drawing 
outsite the paint event (AFAIU).
It should thus not be a problem constructing and destructing a lot of 
DCs serially, or pass existing DCs onto drawing functions which today 
create their own DC on the stack.

~/= Marius

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