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Workaround libpng crash on macos by not creating NSImage from png data #7252

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Merged
Wumpf merged 1 commit into from
Jun 19, 2025
Merged

Workaround libpng crash on macos by not creating NSImage from png data #7252

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49 changes: 39 additions & 10 deletions crates/eframe/src/native/app_icon.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -205,13 +205,18 @@ fn set_title_and_icon_mac(title: &str, icon_data: Option<&IconData>) -> AppIconS

use objc2::ClassType as _;
use objc2_app_kit::{NSApplication, NSImage};
use objc2_foundation::{NSData, NSString};
use objc2_foundation::NSString;

let png_bytes = if let Some(icon_data) = icon_data {
match icon_data.to_png_bytes() {
Ok(png_bytes) => Some(png_bytes),
// Do NOT use png even though creating `NSImage` from it is much easier than from raw images data!
//
// Some MacOS versions have a bug where creating an `NSImage` from a png will cause it to load an arbitrary `libpng.dylib`.
// If this dylib isn't the right version, the application will crash with SIGBUS.
// For details see https://github.com/emilk/egui/issues/7155
let image = if let Some(icon_data) = icon_data {
match icon_data.to_image() {
Ok(image) => Some(image),
Err(err) => {
log::warn!("Failed to convert IconData to png: {err}");
log::warn!("Failed to read icon data: {err}");
return AppIconStatus::NotSetIgnored;
}
}
Expand All @@ -231,15 +236,39 @@ fn set_title_and_icon_mac(title: &str, icon_data: Option<&IconData>) -> AppIconS
return AppIconStatus::NotSetIgnored;
};

if let Some(png_bytes) = png_bytes {
let data = NSData::from_vec(png_bytes);
if let Some(image) = image {
use objc2_app_kit::{NSBitmapImageRep, NSDeviceRGBColorSpace};
use objc2_foundation::NSSize;

log::trace!("NSBitmapImageRep::initWithBitmapDataPlanes_pixelsWide_pixelsHigh_bitsPerSample_samplesPerPixel_hasAlpha_isPlanar_colorSpaceName_bytesPerRow_bitsPerPixel");
let Some(image_rep) = NSBitmapImageRep::initWithBitmapDataPlanes_pixelsWide_pixelsHigh_bitsPerSample_samplesPerPixel_hasAlpha_isPlanar_colorSpaceName_bytesPerRow_bitsPerPixel(
NSBitmapImageRep::alloc(),
[image.as_raw().as_ptr().cast_mut()].as_mut_ptr(),
image.width() as isize,
image.height() as isize,
8, // bits per sample
4, // samples per pixel
true, // has alpha
false, // is not planar
NSDeviceRGBColorSpace,
(image.width() * 4) as isize, // bytes per row
32 // bits per pixel
) else {
log::warn!("Failed to create NSBitmapImageRep from app icon data.");
return AppIconStatus::NotSetIgnored;
};

log::trace!("NSImage::initWithData…");
let app_icon = NSImage::initWithData(NSImage::alloc(), &data);
log::trace!("NSImage::initWithSize");
let app_icon = NSImage::initWithSize(
NSImage::alloc(),
NSSize::new(image.width() as f64, image.height() as f64),
);
log::trace!("NSImage::addRepresentation");
app_icon.addRepresentation(&image_rep);

profiling::scope!("setApplicationIconImage_");
log::trace!("setApplicationIconImage…");
app.setApplicationIconImage(app_icon.as_deref());
app.setApplicationIconImage(Some(&app_icon));
}

// Change the title in the top bar - for python processes this would be again "python" otherwise.
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