emulator: Set window icon to game icon. (#4586)

* emulator: Set window icon to game icon.

* window: Match system icon look-and-feel on macOS

* window: Log SDL error on failure to set icon

CMakeLists.txt

@@ -816,6 +816,10 @@ set(COMMON src/common/logging/classes.h
            src/common/key_manager.h
 )
 
+if (APPLE)
+    list(APPEND COMMON src/common/apple.h src/common/apple.mm)
+endif()
+
 if (ENABLE_DISCORD_RPC)
     list(APPEND COMMON src/common/discord_rpc_handler.cpp src/common/discord_rpc_handler.h)
 endif()

src/common/apple.h

@@ -0,0 +1,12 @@
+// SPDX-FileCopyrightText: Copyright 2026 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <filesystem>
+
+namespace Common {
+
+void SetAppIcon(const std::filesystem::path& path);
+
+} // namespace Common

src/common/apple.mm

@@ -0,0 +1,47 @@
+// SPDX-FileCopyrightText: Copyright 2026 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <filesystem>
+#include <Cocoa/Cocoa.h>
+
+#include "common/apple.h"
+
+namespace Common {
+
+void SetAppIcon(const std::filesystem::path& path) {
+    @autoreleasepool {
+        NSString* path_str = [NSString stringWithUTF8String:path.native().c_str()];
+        NSImage* base_icon = [[[NSImage alloc] initWithContentsOfFile:path_str] autorelease];
+
+        // Transform the icon to match native look-and-feel.
+        constexpr double ScaleFactor = 13.0 / 16.0;
+        constexpr double CornerRadiusFactor = 22.0 / 100.0;
+
+        const double base_icon_width = base_icon.size.width;
+        const double base_icon_height = base_icon.size.height;
+        const double icon_width = base_icon_width * ScaleFactor;
+        const double icon_height = base_icon_height * ScaleFactor;
+        const double icon_x = (base_icon_width - icon_width) / 2.0;
+        const double icon_y = (base_icon_height - icon_height) / 2.0;
+        const double corner_radius_x = icon_width * CornerRadiusFactor;
+        const double corner_radius_y = icon_height * CornerRadiusFactor;
+
+        NSRect bounds = NSMakeRect(icon_x, icon_y, icon_width, icon_height);
+        NSBezierPath* mask_path = [NSBezierPath bezierPathWithRoundedRect:bounds
+                                                                  xRadius:corner_radius_x
+                                                                  yRadius:corner_radius_y];
+
+        NSImage* rounded_icon = [[[NSImage alloc] initWithSize:base_icon.size] autorelease];
+        [rounded_icon lockFocus];
+        [mask_path addClip];
+        [base_icon drawInRect:bounds
+                     fromRect:NSZeroRect
+                    operation:NSCompositingOperationSourceOver
+                     fraction:1.0f];
+        [rounded_icon unlockFocus];
+
+        [NSApp setApplicationIconImage:rounded_icon];
+    }
+}
+
+} // namespace Common

src/emulator.cpp

@@ -430,6 +430,11 @@ void Emulator::Run(std::filesystem::path file, std::vector<std::string> args,
 
     g_window = window.get();
 
+    std::filesystem::path icon_path = mnt->GetHostPath("/app0/sce_sys/icon0.png");
+    if (std::filesystem::exists(icon_path)) {
+        window->SetIcon(icon_path);
+    }
+
     const auto& mount_data_dir = Common::FS::GetUserPath(Common::FS::PathType::GameDataDir);
     mnt->Mount(mount_data_dir, "/data");
 

src/sdl_window.cpp

@@ -1,14 +1,19 @@
 // SPDX-FileCopyrightText: Copyright 2024-2026 shadPS4 Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-#include "SDL3/SDL_events.h"
-#include "SDL3/SDL_hints.h"
-#include "SDL3/SDL_init.h"
-#include "SDL3/SDL_properties.h"
-#include "SDL3/SDL_timer.h"
-#include "SDL3/SDL_video.h"
+#include <SDL3/SDL_events.h>
+#include <SDL3/SDL_hints.h>
+#include <SDL3/SDL_init.h>
+#include <SDL3/SDL_properties.h>
+#include <SDL3/SDL_timer.h>
+#include <SDL3/SDL_video.h>
+#include <stb_image.h>
+
 #include "common/assert.h"
 #include "common/elf_info.h"
+#include "common/io_file.h"
+#include "common/logging/formatter.h"
+#include "common/scope_exit.h"
 #include "core/debug_state.h"
 #include "core/devtools/layer.h"
 #include "core/emulator_settings.h"
@@ -24,9 +29,9 @@
 #include "video_core/renderdoc.h"
 
 #ifdef __APPLE__
-#include "SDL3/SDL_metal.h"
+#include <SDL3/SDL_metal.h>
+#include "common/apple.h"
 #endif
-#include <core/emulator_settings.h>
 
 namespace Frontend {
 
@@ -172,6 +177,55 @@ WindowSDL::WindowSDL(s32 width_, s32 height_, Input::GameControllers* controller
 
 WindowSDL::~WindowSDL() = default;
 
+void WindowSDL::SetIcon(const std::filesystem::path& path) {
+#ifdef __APPLE__
+    // Use native path which matches system icon look-and-feel.
+    Common::SetAppIcon(path);
+#else
+    Common::FS::IOFile file{path, Common::FS::FileAccessMode::Read,
+                            Common::FS::FileType::BinaryFile,
+                            Common::FS::FileShareFlag::ShareReadWrite};
+    if (!file.IsOpen()) {
+        LOG_ERROR(Core, "Failed to open window icon file '{}'.", fmt::UTF(path.u8string()));
+        return;
+    }
+
+    const u64 file_size = file.GetSize();
+    std::vector<u8> buf(file_size);
+    const size_t bytes_read = file.ReadRaw<u8>(buf.data(), file_size);
+    file.Close();
+    if (bytes_read < file_size) {
+        LOG_ERROR(Core, "Failed to read window icon file '{}'.", fmt::UTF(path.u8string()));
+        return;
+    }
+
+    int image_width = 0;
+    int image_height = 0;
+    constexpr int num_channels = 4;
+    unsigned char* image_data =
+        stbi_load_from_memory(buf.data(), static_cast<int>(buf.size()), &image_width, &image_height,
+                              nullptr, num_channels);
+    if (image_data == nullptr) {
+        LOG_ERROR(Core, "Failed to load window icon image '{}': {}", fmt::UTF(path.u8string()),
+                  stbi_failure_reason());
+        return;
+    }
+    SCOPE_EXIT {
+        stbi_image_free(image_data);
+    };
+
+    SDL_Surface* surface = SDL_CreateSurfaceFrom(image_width, image_height, SDL_PIXELFORMAT_RGBA32,
+                                                 image_data, image_width * num_channels);
+    if (surface == nullptr) {
+        LOG_ERROR(Core, "Failed to create SDL surface for window icon: {}", SDL_GetError());
+    }
+    if (!SDL_SetWindowIcon(window, surface)) {
+        LOG_ERROR(Core, "Failed to set SDL window icon: {}", SDL_GetError());
+    }
+    SDL_DestroySurface(surface);
+#endif
+}
+
 void WindowSDL::WaitEvent() {
     // Called on main thread
     SDL_Event event;

src/sdl_window.h

@@ -71,6 +71,8 @@ public:
         return window_info;
     }
 
+    void SetIcon(const std::filesystem::path& path);
+
     void WaitEvent();
     void InitTimers();