kicad-developers team mailing list archive

[Tomasz Wlostowski <tomasz.wlostowski@xxxxxxx>]

On 28/08/18 19:55, Seth Hillbrand wrote:
> OK.  Then, you should be able to scale the cairo context by 0.5 and draw
> individual pixels instead of 2x2 blocks.

It doesn't work this way on OSX. If you want smooth graphics, you either
have to request a full resolution framebuffer (see
common/gal/hidpi_gl_canvas.cpp) or use Quartz for drawing. Since Cairo
in Kicad renders to memory and then copies to framebuffer, if the FB's
resolution is downscaled by 2 by Apple, the output will be blocky.

My solution would be to stick to OpenGL with hardware antialiasing.

Tom


> 
> -S
> 
> Am Di., 28. Aug. 2018 um 10:35 Uhr schrieb Jeff Young <jeff@xxxxxxxxx
> <mailto:jeff@xxxxxxxxx>>:
> 
>     Scratch that last comment; I got myself tied in knots.
> 
>     It is Cairo that renders blocky.
> 
> 
>>     On 28 Aug 2018, at 18:29, Jeff Young <jeff@xxxxxxxxx
>>     <mailto:jeff@xxxxxxxxx>> wrote:
>>
>>     Interesting.  It’s not Cairo.
>>
>>     We currently have EDA_DRAW_PANEL_GAL hard-coded to OpenGL, so it’s
>>     actually OpenGL that’s rendering blocky….
>>
>>
>>>     On 28 Aug 2018, at 18:11, Jeff Young <jeff@xxxxxxxxx
>>>     <mailto:jeff@xxxxxxxxx>> wrote:
>>>
>>>     Hi Seth,
>>>
>>>     The scaling comes out correct, it’s just blocky.
>>>
>>>     Is there some way to adjust what Cairo thinks the screen
>>>     resolution is and then re-scale the canvas so that everything
>>>     comes out the same again?  I don’t know.
>>>
>>>     Cheers,
>>>     Jeff.
>>>
>>>
>>>>     On 28 Aug 2018, at 18:06, Seth Hillbrand <seth@xxxxxxxxxxxxx
>>>>     <mailto:seth@xxxxxxxxxxxxx>> wrote:
>>>>
>>>>     Can we just use cairo_scale to adjust the axes for Mac retina?
>>>>
>>>>     -S
>>>>
>>>>     Am Di., 28. Aug. 2018 um 09:59 Uhr schrieb Jeff Young
>>>>     <jeff@xxxxxxxxx <mailto:jeff@xxxxxxxxx>>:
>>>>
>>>>         JP made the Footprint Wizard Cairo-only recently, and I
>>>>         planned to do the same for the Eeschema dialog previews.
>>>>
>>>>         However, I’ve just discovered that Cairo doesn’t handle
>>>>         Retina displays on Mac.  (It essentially draws blocks of 2x2
>>>>         pixels instead of individual ones.)
>>>>
>>>>         Anyone know if this is something we can fix, or if we need
>>>>         to use OpenGL on Mac?
>>>>         _______________________________________________
>>>>         Mailing list: https://launchpad.net/~kicad-developers
>>>>         <https://launchpad.net/%7Ekicad-developers>
>>>>         Post to     : kicad-developers@xxxxxxxxxxxxxxxxxxx
>>>>         <mailto:kicad-developers@xxxxxxxxxxxxxxxxxxx>
>>>>         Unsubscribe : https://launchpad.net/~kicad-developers
>>>>         <https://launchpad.net/%7Ekicad-developers>
>>>>         More help   : https://help.launchpad.net/ListHelp
>>>>
>>>
>>>     _______________________________________________
>>>     Mailing list: https://launchpad.net/~kicad-developers
>>>     <https://launchpad.net/%7Ekicad-developers>
>>>     Post to     : kicad-developers@xxxxxxxxxxxxxxxxxxx
>>>     <mailto:kicad-developers@xxxxxxxxxxxxxxxxxxx>
>>>     Unsubscribe : https://launchpad.net/~kicad-developers
>>>     <https://launchpad.net/%7Ekicad-developers>
>>>     More help   : https://help.launchpad.net/ListHelp
>>
> 
> 
> 
> _______________________________________________
> Mailing list: https://launchpad.net/~kicad-developers
> Post to     : kicad-developers@xxxxxxxxxxxxxxxxxxx
> Unsubscribe : https://launchpad.net/~kicad-developers
> More help   : https://help.launchpad.net/ListHelp
>