Replace wrestool with native Rust PE icon extraction (pelite)

- Add icons.rs to nak crate: parses PE resource sections, extracts
  RT_GROUP_ICON/RT_ICON and builds ICO files in memory
- Expose nak_extract_exe_icon() FFI for C++ consumption
- Update iconForExecutable() to use Rust FFI instead of shelling out
  to wrestool; reads all ICO entries for correct color depth
- Fix BasicGamePlugin::gameIcon() to call iconForExecutable() (was
  returning empty QIcon, causing placeholder icons for BG3/Cyberpunk)
- Move app icon setup: setDesktopFileName + setWindowIcon to
  MOApplication constructor (fixes Wayland taskbar/decoration icon)
- Move data/com.fluorine.* to data/icons/, install to XDG paths at
  launch for Wayland compositor icon resolution
- Remove icoutils dependency from Docker image and build output

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/libs/nak_ffi/src/lib.rs b/libs/nak_ffi/src/lib.rs
index 65592fa..c45481b 100644
--- a/libs/nak_ffi/src/lib.rs
+++ b/libs/nak_ffi/src/lib.rs
@@ -615,6 +615,57 @@ pub extern "C" fn nak_get_dxvk_conf_path() -> *mut c_char {
 }

 

 // ============================================================================

+// Tier 8: PE Icon Extraction

+// ============================================================================

+

+/// Result of icon extraction

+#[repr(C)]

+pub struct NakIconData {

+    /// Raw ICO file bytes (caller must free with nak_icon_data_free)

+    pub data: *mut u8,

+    /// Length of the data in bytes (0 if extraction failed)

+    pub len: usize,

+}

+

+/// Extract the best icon from a Windows PE executable (.exe/.dll).

+///

+/// Returns NakIconData with the raw ICO file bytes.

+/// If extraction fails, data is null and len is 0.

+/// Caller must free the result with nak_icon_data_free().

+#[no_mangle]

+pub unsafe extern "C" fn nak_extract_exe_icon(exe_path: *const c_char) -> NakIconData {

+    let path_str = unsafe { from_cstr(exe_path) };

+    if path_str.is_empty() {

+        return NakIconData {

+            data: ptr::null_mut(),

+            len: 0,

+        };

+    }

+

+    match nak_rust::icons::extract_icon(std::path::Path::new(path_str)) {

+        Some(bytes) => {

+            let len = bytes.len();

+            let mut boxed = bytes.into_boxed_slice();

+            let ptr = boxed.as_mut_ptr();

+            std::mem::forget(boxed);

+            NakIconData { data: ptr, len }

+        }

+        None => NakIconData {

+            data: ptr::null_mut(),

+            len: 0,

+        },

+    }

+}

+

+/// Free icon data returned by nak_extract_exe_icon

+#[no_mangle]

+pub unsafe extern "C" fn nak_icon_data_free(icon: NakIconData) {

+    if !icon.data.is_null() && icon.len > 0 {

+        let _ = unsafe { Vec::from_raw_parts(icon.data, icon.len, icon.len) };

+    }

+}

+

+// ============================================================================

 // General: String free

 // ============================================================================