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docs(cursor): explain image decoding and Retina sampling

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fufesou
2026-09-12 20:51:58 +08:00
parent bbf86259e9
commit 02e4f02815
2 changed files with 6 additions and 1 deletions
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4
flutter/lib/models/model.dart
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@@ -2995,7 +2995,9 @@ class PredefinedCursor {
() async { () async {
_image?.dispose(); _image?.dispose();
// PNG stores straight alpha; let the codec prepare the pixels for ui.Image. // Native registration uses this ui.Image. The RGBA bytes from img2 are
// straight alpha, but PixelFormat.rgba8888 requires premultiplied alpha.
// Decode the PNG directly to preserve translucent cursor colors.
final codec = await ui.instantiateImageCodec(pngBytes); final codec = await ui.instantiateImageCodec(pngBytes);
final ui.Image nativeImage; final ui.Image nativeImage;
try { try {

3
src/platform/macos.rs
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@@ -638,6 +638,9 @@ fn unsafe_get_cursor_data(hcursor: u64) -> ResultType<CursorData> {
if hcursor != hcursor2 { if hcursor != hcursor2 {
bail!("cursor changed"); bail!("cursor changed");
} }
// NSImage.size is in points; using it as bitmap dimensions can crop Retina
// artwork. Render the full image and convert its hotspot to pixels;
// keep the existing 1x sampling path below.
if scale > 1.0 { if scale > 1.0 {
return cursor::data(c, hcursor, scale); return cursor::data(c, hcursor, scale);
} }