Color picker issues on macOS

[Seppe Stas]

The new color picker introduced in [5f4599fb56da4dd748845ab10abec02961d477f3](https://git.launchpad.net/kicad/patch/?id=5f4599fb56da4dd748845ab10abec02961d477f3) does not work correctly on macOS. The controls seem to work, but the visual representation (color wheel) seems to be missing. See attached screenshot.

Produced on KiCad at 4122aa1c0 on macOS 10.12.6 (16G29)

[Jon Evans (craftyjon)]

Confirmed on my 10.12 machine

[jean-pierre charras (jp-charras)]

Hi Jon,
I am not able to debug OSX applications, and I do not see anything in code that can explain this issue.

Could you have a look into this problem.
Thanks.

[Bernhard Stegmaier (stegmaier)]

Same for me, also on 10.12.
Also doesn't work with a current wxWidgets master.

[Seppe Stas (seppestas)]

I narrowed down the issue to `createRGBBitmap` (and probably also `createHSVBitmap`).

When setting the background of `bitmapDC` in `createRGBBitmap` to red I get the attached result.

Maybe changing the origin doesn't work on macOS?

[Seppe Stas (seppestas)]

Mmmh, the alpha channel of a `KIGFX::COLOR4D` initializes to 0... The color pickers shouldn't work on any platform. I guess it was tested on a platform that does not support colors with alpha channels in `wxBitmap` (I'm guessing Windows).

Anyhow, setting it to 1 seems to work. Will send patch to mailing list.

[KiCad Janitor (kicad-janitor)]

Fixed in revision 5aeb6129ca8c83919576f3e090b7ea2430c6b1b0
https://git.launchpad.net/kicad/patch/?id=5aeb6129ca8c83919576f3e090b7ea2430c6b1b0