[desktop] More qt_common reorganization (#3916)

Ported from QML branch.

Main "big" change is that EmuThread is now a shared state in QtCommon,
not individually managed/passed around by GRenderWindow and MainWindow.

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3916
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

src/qt_common/util/game.cpp

@@ -11,7 +11,6 @@
 #include "qt_common/abstract/frontend.h"
 #include "qt_common/config/uisettings.h"
 #include "qt_common/qt_common.h"
-#include "yuzu/util/util.h"
 
 #include <QDesktopServices>
 #include <QStandardPaths>
@@ -22,6 +21,7 @@
 #include <windows.h>
 #include "common/scope_exit.h"
 #include "common/string_util.h"
+#include "common/fs/file.h"
 #else
 #include <fstream>
 #include "fmt/ostream.h"
@@ -367,6 +367,7 @@ void ResetMetadata(bool show_message) {
 
 // Uhhh //
 
+// TODO(crueter): Make QtCommon::Shortcut
 // Messages in pre-defined message boxes for less code spaghetti
 inline constexpr bool CreateShortcutMessagesGUI(ShortcutMessages imsg, const QString& game_title) {
     int result = 0;
@@ -533,4 +534,110 @@ void CreateHomeMenuShortcut(ShortcutTarget target) {
     CreateShortcut(game_path, QLaunchId, "Switch Home Menu", target, "-qlaunch", false);
 }
 
+bool SaveIconToFile(const std::filesystem::path& icon_path, const QImage& image) {
+#if defined(WIN32)
+#pragma pack(push, 2)
+    struct IconDir {
+        WORD id_reserved;
+        WORD id_type;
+        WORD id_count;
+    };
+
+    struct IconDirEntry {
+        BYTE width;
+        BYTE height;
+        BYTE color_count;
+        BYTE reserved;
+        WORD planes;
+        WORD bit_count;
+        DWORD bytes_in_res;
+        DWORD image_offset;
+    };
+#pragma pack(pop)
+
+    const QImage source_image = image.convertToFormat(QImage::Format_RGB32);
+    constexpr std::array<int, 7> scale_sizes{256, 128, 64, 48, 32, 24, 16};
+    constexpr int bytes_per_pixel = 4;
+
+    const IconDir icon_dir{
+        .id_reserved = 0,
+        .id_type = 1,
+        .id_count = static_cast<WORD>(scale_sizes.size()),
+    };
+
+    Common::FS::IOFile icon_file(icon_path.string(), Common::FS::FileAccessMode::Write,
+                                 Common::FS::FileType::BinaryFile);
+    if (!icon_file.IsOpen()) {
+        return false;
+    }
+
+    if (!icon_file.Write(icon_dir)) {
+        return false;
+    }
+
+    std::size_t image_offset = sizeof(IconDir) + (sizeof(IconDirEntry) * scale_sizes.size());
+    for (std::size_t i = 0; i < scale_sizes.size(); i++) {
+        const int image_size = scale_sizes[i] * scale_sizes[i] * bytes_per_pixel;
+        const IconDirEntry icon_entry{
+            .width = static_cast<BYTE>(scale_sizes[i]),
+            .height = static_cast<BYTE>(scale_sizes[i]),
+            .color_count = 0,
+            .reserved = 0,
+            .planes = 1,
+            .bit_count = bytes_per_pixel * 8,
+            .bytes_in_res = static_cast<DWORD>(sizeof(BITMAPINFOHEADER) + image_size),
+            .image_offset = static_cast<DWORD>(image_offset),
+        };
+        image_offset += icon_entry.bytes_in_res;
+        if (!icon_file.Write(icon_entry)) {
+            return false;
+        }
+    }
+
+    for (std::size_t i = 0; i < scale_sizes.size(); i++) {
+        const QImage scaled_image = source_image.scaled(
+            scale_sizes[i], scale_sizes[i], Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+        const BITMAPINFOHEADER info_header{
+            .biSize = sizeof(BITMAPINFOHEADER),
+            .biWidth = scaled_image.width(),
+            .biHeight = scaled_image.height() * 2,
+            .biPlanes = 1,
+            .biBitCount = bytes_per_pixel * 8,
+            .biCompression = BI_RGB,
+            .biSizeImage{},
+            .biXPelsPerMeter{},
+            .biYPelsPerMeter{},
+            .biClrUsed{},
+            .biClrImportant{},
+        };
+
+        if (!icon_file.Write(info_header)) {
+            return false;
+        }
+
+        for (int y = 0; y < scaled_image.height(); y++) {
+            const auto* line = scaled_image.scanLine(scaled_image.height() - 1 - y);
+            std::vector<u8> line_data(scaled_image.width() * bytes_per_pixel);
+            std::memcpy(line_data.data(), line, line_data.size());
+            if (!icon_file.Write(line_data)) {
+                return false;
+            }
+        }
+    }
+    icon_file.Close();
+
+    return true;
+#elif defined(__unix__) && !defined(__APPLE__) && !defined(__ANDROID__)
+    // Convert and write the icon as a PNG
+    if (!image.save(QString::fromStdString(icon_path.string()))) {
+        LOG_ERROR(Frontend, "Could not write icon as PNG to file");
+    } else {
+        LOG_INFO(Frontend, "Wrote an icon to {}", icon_path.string());
+    }
+    return true;
+#else
+    return false;
+#endif
+}
+
 } // namespace QtCommon::Game