| library SubPixelLayout; |
| import "dart:html"; |
| |
| var enabled = null; |
| |
| bool isEnabled() { |
| if (enabled == null) { |
| var elem = document.createElement('div'); |
| elem.style.setProperty('width', '4.5px'); |
| document.body.append(elem); |
| var bounds = elem.getBoundingClientRect(); |
| enabled = (bounds.width != bounds.width.floor()); |
| elem.remove(); |
| } |
| return enabled; |
| } |
| |
| int snapToLayoutUnit(f) { |
| return isEnabled() ? (f * 64).floor() ~/ 64 : f.floor(); // as in LayoutUnit(f).toFloat() |
| } |
| |
| int ceilToLayoutUnit(f) { |
| return isEnabled() ? (f * 64).ceil() ~/ 64 : f.ceil(); // see ceiledLayoutUnit(), LayoutUnit.h |
| } |
| |
| double resolution() { |
| return isEnabled() ? 1/64 : 1; |
| } |
| |
