[pixel] Add warning message on Linux

[NancyLi1013]

Add warning message for installing libglu1-mesa-dev on Ubuntu.
Other changes:

• Add Homepage and Supports in CONTROL
• Remove unused functions
• Add unsupported messages

Related issue #10593

Note: No features need test.

[linquize]

Why do you think that pixel does not support Windows?

[NancyLi1013]

I try to install pixel on Windows but failed.
I also noticed that all the triplets on Windows platform were set as fail in ci.baseline.txt.

pixel:x64-uwp=fail
pixel:x64-windows=fail
pixel:x64-windows-static=fail
pixel:x86-windows=fail

[linquize]

It works on Windows too, at least Release config.
I tested with this example: https://github.com/dascandy/pixel/blob/master/examples/simple/src/simple.cpp

[linquize]

Oh, you have to patch one thing for MSVC: add return value in https://github.com/dascandy/pixel/blob/1a3631429da9eeac5208584713f358ef0ab09e51/pixel/src/Window.cpp#L270
Then Windows x64 Release will work.

[NancyLi1013]

@linquize
Thanks again for your deep investigation about this port.
I will test this on my local.

[NancyLi1013]

/azp run

[NancyLi1013]

@linquize
I added the return value but there were still many errors like this:

pixeld.lib(Canvas.cpp.obj) : error LNK2005: "public: static class Pixel::Color const Pixel::Color::AliceBlue" (?AliceBlue@Color@Pixel@@2V12@B) already defined in image_swap.cpp.obj
pixeld.lib(Canvas.cpp.obj) : error LNK2005: "public: static class Pixel::Color const Pixel::Color::AntiqueWhite" (?AntiqueWhite@Color@Pixel@@2V12@B) already defined in image_swap.cpp.obj
pixeld.lib(Canvas.cpp.obj) : error LNK2005: "public: static class Pixel::Color const Pixel::Color::Aqua" (?Aqua@Color@Pixel@@2V12@B) already defined in image_swap.cpp.obj
pixeld.lib(Canvas.cpp.obj) : error LNK2005: "public: static class Pixel::Color const Pixel::Color::Aquamarine" (?Aquamarine@Color@Pixel@@2V12@B) already defined in image_swap.cpp.obj
pixeld.lib(Canvas.cpp.obj) : error LNK2005: "public: static class Pixel::Color const Pixel::Color::Azure" (?Azure@Color@Pixel@@2V12@B) already defined in image_swap.cpp.obj
pixeld.lib(Canvas.cpp.obj) : error LNK2005: "public: static class Pixel::Color const Pixel::Color::Beige" (?Beige@Color@Pixel@@2V12@B) already defined in image_swap.cpp.obj

Except for disabling examples, I can build this port successfuuly.
As for the example you tested, It was added in the latest commit and not in release version.

I also try to update this port to the latest commit, there are also many errors.

It seems that there are a lot of work need to be done in pixel source code.

[linquize]

The port builds successfully, of course.
But for the library user, the example code linking debug dynamic / debug static / Release static not working
The only working config is Release dynamic

[NancyLi1013]

Thanks for your description about this.
Personally, it might be better not to support Windows now.
We can update this port if the source code has implemented these functions.

[PhoebeHui]

I think it's better to report the issue to Upstream instead before we support in vcpkg.

[NancyLi1013]

The related issue on upstream dascandy/pixel#10

[ras0219-msft]

LGTM, agree with the course of action (re: notifying upstream)