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higan currently scales it's image via integer scaling only. This creates massive black borders on many screens.
This patch gives the option to disable integer scaling and thereby allow a fullscreen image (with overscan blanking).

As of higan v101r22 (https://gitlab.com/higan/higan), the fix would go something like this:

sfc/interface/interface.cpp (make similar changes to fc, ms, md, gb, gba, and ws, too)


Code:
auto Interface::videoSize(uint width, uint height, bool arc, bool intScale) -> VideoSize {
double w = 256 * (arc ? 8.0 / 7.0 : 1.0);
double h = 240;
double m;

if(intScale) m = min( (uint)(width / w), (uint)(height / h));
else m = min((double)(width / w), (double)(height / h));

return {(uint)(w * m), (uint)(h * m)};
}




target-tomoko/presentation/presentation.cpp


Code:
auto Presentation::resizeViewport() -> void {
//clear video area before resizing to avoid seeing distorted video momentarily
clearViewport();

uint scale = 2;
if(settings["Video/Scale"].text() == "Small" ) scale = 2;
if(settings["Video/Scale"].text() == "Medium") scale = 3;
if(settings["Video/Scale"].text() == "Large" ) scale = 4;

uint windowWidth = 0, windowHeight = 0;
bool aspectCorrection = true;
bool integerScaling = true;
if(!fullScreen()) {
aspectCorrection = settings["Video/AspectCorrection"].boolean();
windowWidth = 320 * scale;
windowHeight = 240 * scale;
} else {
integerScaling = settings["Video/Shader"].text() == "None";
windowWidth = geometry().width();
windowHeight = geometry().height();
}
if(!fullScreen()) setSize({windowWidth, windowHeight});

if(!emulator) {
viewport.setGeometry({0, 0, windowWidth, windowHeight});
} else {
auto videoSize = emulator->videoSize(windowWidth, windowHeight, aspectCorrection, integerScaling);
viewport.setGeometry({
(windowWidth - videoSize.width) / 2, (windowHeight - videoSize.height) / 2,
videoSize.width, videoSize.height
});
}

//clear video area again to ensure entire viewport area has been painted in
clearViewport();
}




This takes out the "Disable Integer Scaling" setting and instead makes it so that Integer Scaling is enabled for the None filter, and disabled for the Blur filter and all video shaders. If you want to make the display fill the screen from top to bottom, you will need to select the Blur filter or install some video shaders and use those.

If you really want to disable integer scaling for Nearest Neighbor, change

integerScaling = settings["Video/Shader"].text() == "None";

to

integerScaling = false;

I have tried this and am still getting massive black borders.

As far as I can tell, this was rejected by upstream, not included with 102.

It has indeed. That settles it then, if upstream won't support it, I won't include it in our package, it's against arch policies to patch unsupported stuff.