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fix(flutter): correct cursor scaling and Linux cursor clipping

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Keep Linux/macOS bitmap sizing and painted cursor DPI
conversion consistent, and derive hotspots from the actual scaled bitmap.

Pad tall Linux native cursor buffers with transparency to
preserve the lower half in the hardware cursor plane.
Cover bitmap sizing, hotspots, artwork preservation,
and painting with focused regression tests.
This commit is contained in:
fufesou
2026-09-10 21:31:24 +08:00
parent f5b98b32f2
commit f96d00d9d1
5 changed files with 260 additions and 23 deletions
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22
flutter/lib/models/model.dart
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@@ -2879,9 +2879,21 @@ class CursorData {
int _doubleToInt(double v) => (v * 10e6).round().toInt();
bool get _usesLogicalCursorPixels => isLinux || isMacOS;
int get scaledWidth => _scaledDimension(width, scale);
int get scaledHeight => _scaledDimension(height, scale);
int _scaledDimension(int dimension, double scale) {
const minBitmapSize = 1;
final pixels = dimension * scale;
return _usesLogicalCursorPixels
? max(minBitmapSize, pixels.round())
: pixels.toInt();
}
double _checkUpdateScale(double scale) {
double oldScale = this.scale;
if (scale != 1.0) {
if (!_usesLogicalCursorPixels && scale != 1.0) {
// Update data if scale changed.
final tgtWidth = (width * scale).toInt();
final tgtHeight = (height * scale).toInt();
@@ -2907,8 +2919,8 @@ class CursorData {
img2.encodePng(
img2.copyResize(
image,
width: (width * scale).toInt(),
height: (height * scale).toInt(),
width: _scaledDimension(width, scale),
height: _scaledDimension(height, scale),
interpolation: img2.Interpolation.average,
),
),
@@ -2917,8 +2929,8 @@ class CursorData {
}
this.scale = scale;
hotx = hotxOrigin * scale;
hoty = hotyOrigin * scale;
hotx = hotxOrigin * (_usesLogicalCursorPixels ? scaledWidth / width : scale);
hoty = hotyOrigin * (_usesLogicalCursorPixels ? scaledHeight / height : scale);
return scale;
}