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[HTML5] Detect screen scale and DPI.

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`OS.get_screen_scale` will now return the `window.devicePixelRatio`
value, `OS.get_screen_dpi` uses CSS media queries to find approximate
DPI value for the current display.
`OS.get_screen_size` also return the actual screen size (not the CSS
pixel size).
This commit is contained in:
Fabio Alessandrelli
2021-02-12 10:50:02 +01:00
parent e9a25b8552
commit 6cff589b5b
4 changed files with 35 additions and 2 deletions
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26
platform/javascript/js/libs/library_godot_display.js
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@@ -405,6 +405,27 @@ const GodotDisplay = {
$GodotDisplay__deps: ['$GodotConfig', '$GodotRuntime', '$GodotDisplayCursor', '$GodotDisplayListeners', '$GodotDisplayDragDrop', '$GodotDisplayGamepads'],
$GodotDisplay: {
window_icon: '',
findDPI: function () {
function testDPI(dpi) {
return window.matchMedia(`(max-resolution: ${dpi}dpi)`).matches;
}
function bisect(low, high, func) {
const mid = parseInt(((high - low) / 2) + low, 10);
if (high - low <= 1) {
return func(high) ? high : low;
}
if (func(mid)) {
return bisect(low, mid, func);
}
return bisect(mid, high, func);
}
try {
const dpi = bisect(0, 800, testDPI);
return dpi >= 96 ? dpi : 96;
} catch (e) {
return 96;
}
},
},
godot_js_display_is_swap_ok_cancel__sig: 'i',
@@ -422,6 +443,11 @@ const GodotDisplay = {
window.alert(GodotRuntime.parseString(p_text)); // eslint-disable-line no-alert
},
godot_js_display_screen_dpi_get__sig: 'i',
godot_js_display_screen_dpi_get: function () {
return GodotDisplay.findDPI();
},
godot_js_display_pixel_ratio_get__sig: 'f',
godot_js_display_pixel_ratio_get: function () {
return window.devicePixelRatio || 1;