[New Feature] Integer scaling and super resolution

[donmor]

Former issue #483 .
This PR added a feature that making it able to do integer scaling, to achieve "pixel perfect". When option Settings > Video Integer Scaling is on, the core renderer detects the window size and scale the original video to the max size while keeping pixel-perfect. An entry added in settings.

[lgtm-com]

This pull request introduces 1 alert when merging 204b64a into 500c8ba - view on LGTM.com

new alerts:

• 1 for Useless assignment to local variable

[donmor]

Update: Super resolution
Makes the video horizontally stretched when Video Super Resolution enabled. Can be affected by Video Integer Scaling. The menu will have a different behavior to work properly under super resolutions.

[donmor]

Update: Added support to unicode font. A unifont.png need to be placed in assets directory. To generate unifont.png, fetch "Plane 0 Chart" in BMP format from http://unifoundry.com/unifont/index.html, then make it reversed and saved as PNG.

[donmor]

Update: Refactorred Super Resolution to Aspect Correction. Once set to the aspect ratio of your monitor, it'll always keep the correct video aspect ratio, despite what resolution is in use.

[donmor]

Update: Nowadays people are usually not willing to change their resolution once a neat one has been set, and the largest resolution is not always best (especially for CRTs). This commit makes Ludo use current desktop resolution when entering full-screen mode.

[flexiondotorg]

@donmor That last commit gold ⭐ Ludo changes the resolution from 1920x1080 to 1920x1200 when connected to my capture card, which introduces screen clipping and refresh rate desync. Thanks for the patch.

[kivutar]

But this last commit breaks full screen on OSX

[donmor]

But this last commit breaks full screen on OSX

Hmmmmmm... Maybe a macro.could help (does go have macros?) or a statement block?

[kivutar]

I think it's also likely to break fullscreen elsewhere. If I recall correctly API of GLFW wants a monitor to be passed to achieve full screen.

[donmor]

Gosh I've not even had a mac and my windows pc's wonky :(
Better to make the last patch a linux-only feature, until I have a mac

[donmor]

Finally I managed to fix the fullscreen mode on linux, and'll test on windows later. So does anyone have a mac here?

[donmor]

Okay please wait for a while before I put some comments in code :)

[donmor]

BTW I think it'd be better to use unicode font glyph instead ascii, as the first step to making i18n stuff.