win32window: Optimize rendering, international keys

- Use StretchDIBits() on a direct window DC, then SwapBuffers() on it instead of legacy rendering which involved many unnecessary steps. This makes rendering a few times faster, which means a lot for idle CPU usage.
- Use PostQuitMessage() to handle WM_QUIT properly on a general event pump instead of attaching GLWP userdata to window (Which could have caused race conditions)
- Do not delegate window creation to a renderer thread. It seems this legacy workaround is not needed with the new rendering implementation
- Add support for a few international keycodes, namely Japanese ro, katakana/henkan/muhenkan modifier keys, and Korean hangeul/hanja modifiers. It however doesn't support 102nd key found on some Ukrainian and German keyboards because the same Win32 keycode is already used for japanese ro, and there is no way to overcome this API limitation it seems. This also needs better testing by someone who actually owns such keyboards.

src/devices/win32window.c

@@ -27,6 +27,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 struct win_data {
     HWND hwnd;
+    HDC  hdc;
 };
 
 static ATOM winclass_atom = 0;
@@ -85,14 +86,6 @@ static const hid_key_t win32_key_to_hid_byte_map[] = {
     [0xBE] = HID_KEY_DOT,
     [0xBF] = HID_KEY_SLASH,
     [0x14] = HID_KEY_CAPSLOCK,
-    [0x11] = HID_KEY_LEFTCTRL,
-    [0x10] = HID_KEY_LEFTSHIFT,
-    [0x12] = HID_KEY_LEFTALT,
-    [0x5B] = HID_KEY_LEFTMETA,
-    [0xA3] = HID_KEY_RIGHTCTRL,
-    [0xA1] = HID_KEY_RIGHTSHIFT,
-    [0xA5] = HID_KEY_RIGHTALT,
-    [0x5C] = HID_KEY_RIGHTMETA,
     [0x70] = HID_KEY_F1,
     [0x71] = HID_KEY_F2,
     [0x72] = HID_KEY_F3,
@@ -136,6 +129,21 @@ static const hid_key_t win32_key_to_hid_byte_map[] = {
     [0x60] = HID_KEY_KP0,
     [0x6E] = HID_KEY_KPDOT,
     [0x5D] = HID_KEY_MENU,
+    [0xE2] = HID_KEY_RO, // It's HID_KEY_102ND on German keyboards (I have one),
+                         // but Windows has no way to distinguish their VK keycodes
+    [0xF2] = HID_KEY_KATAKANAHIRAGANA,
+    [0x1C] = HID_KEY_HENKAN,
+    [0x1D] = HID_KEY_MUHENKAN,
+    [0x15] = HID_KEY_HANGEUL, // Actually KANA on Japanese NEC PC-9800
+    [0x19] = HID_KEY_HANJA,
+    [0x11] = HID_KEY_LEFTCTRL,
+    [0x10] = HID_KEY_LEFTSHIFT,
+    [0x12] = HID_KEY_LEFTALT,
+    [0x5B] = HID_KEY_LEFTMETA,
+    [0xA3] = HID_KEY_RIGHTCTRL,
+    [0xA1] = HID_KEY_RIGHTSHIFT,
+    [0xA5] = HID_KEY_RIGHTALT,
+    [0x5C] = HID_KEY_RIGHTMETA,
 };
 
 static hid_key_t win32_key_to_hid(uint32_t win32_key)
@@ -149,7 +157,7 @@ static hid_key_t win32_key_to_hid(uint32_t win32_key)
 static LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 {
     if (uMsg == WM_CLOSE) {
-        rvvm_reset_machine(((fb_window_t*)GetWindowLongPtrW(hwnd, GWLP_USERDATA))->machine, false);
+        PostQuitMessage(0);
         return 0;
     }
     if (uMsg == WM_SETCURSOR && LOWORD(lParam) == HTCLIENT) SetCursor(NULL);
@@ -169,41 +177,56 @@ bool fb_window_create(fb_window_t* win)
             return false;
         }
     }
-
-    win->data = safe_new_obj(win_data_t);
+    RECT rect = {
+        .right = win->fb.width,
+        .bottom = win->fb.height,
+    };
+    AdjustWindowRectEx(&rect, WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX, false, 0);
+    HWND hwnd = CreateWindowW(L"RVVM_window", L"RVVM",
+        WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_VISIBLE,
+        CW_USEDEFAULT, CW_USEDEFAULT, (rect.right - rect.left), (rect.bottom - rect.top),
+        NULL, NULL, GetModuleHandle(NULL), NULL);
+    if (hwnd == NULL) return false;
+
     win->fb.format = RGB_FMT_A8R8G8B8;
     win->fb.buffer = safe_calloc(framebuffer_size(&win->fb), 1);
-
-    // It's not possible to work with window from thread other than the window creator in win32,
-    // so the hacky workaround is to move window creation to fb_update...
+    win->data = safe_new_obj(win_data_t);
+    win->data->hwnd = hwnd;
+    win->data->hdc = GetDC(hwnd);
+
+#ifndef UNDER_CE
+    SetStretchBltMode(win->data->hdc, STRETCH_HALFTONE);
+#endif
     return true;
 }
 
 void fb_window_close(fb_window_t* win)
 {
-    DestroyWindow(win->data->hwnd);
+    if (win->data->hwnd) {
+        DestroyWindow(win->data->hwnd);
+        ReleaseDC(win->data->hwnd, win->data->hdc);
+    }
     free(win->fb.buffer);
     free(win->data);
 }
 
 void fb_window_update(fb_window_t* win)
 {
-    if (win->data->hwnd == NULL) {
-        RECT rect = {
-            .right = win->fb.width,
-            .bottom = win->fb.height,
-        };
-        AdjustWindowRectEx(&rect, WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX, false, 0);
-        win->data->hwnd = CreateWindowW(L"RVVM_window", L"RVVM",
-            WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_VISIBLE,
-            CW_USEDEFAULT, CW_USEDEFAULT, (rect.right - rect.left), (rect.bottom - rect.top),
-            NULL, NULL, GetModuleHandle(NULL), NULL);
-        if (win->data->hwnd == NULL) return;
-        SetWindowLongPtrW(win->data->hwnd, GWLP_USERDATA, (size_t)win);
-    }
+    BITMAPINFO bmi = {
+        .bmiHeader = {
+            .biSize = sizeof(BITMAPINFOHEADER),
+            .biWidth = win->fb.width,
+            .biHeight = -win->fb.height,
+            .biPlanes = 1,
+            .biBitCount = 32,
+        },
+    };
+    StretchDIBits(win->data->hdc, 0, 0, win->fb.width, win->fb.height,
+                                  0, 0, win->fb.width, win->fb.height,
+                    win->fb.buffer, &bmi, 0, SRCCOPY);
+    SwapBuffers(win->data->hdc);
 
-    InvalidateRect(win->data->hwnd, NULL, 1);
-    MSG Msg;
+    MSG Msg = {0};
     while (PeekMessage(&Msg, win->data->hwnd, 0, 0, PM_REMOVE)) {
         switch (Msg.message) {
             case WM_MOUSEMOVE: {
@@ -245,27 +268,9 @@ void fb_window_update(fb_window_t* win)
             case WM_MOUSEWHEEL:
                 hid_mouse_scroll(win->mouse, -GET_WHEEL_DELTA_WPARAM(Msg.wParam) / WHEEL_DELTA);
                 break;
-            case WM_PAINT: {
-                PAINTSTRUCT ps;
-                RECT rect;
-                HBITMAP hBitmap = CreateBitmap(win->fb.width, win->fb.height, 1, 32, win->fb.buffer);
-                HDC hdc = GetDC(win->data->hwnd);
-                HDC hdcc = CreateCompatibleDC(hdc);
-                ReleaseDC(win->data->hwnd, hdc);
-                SelectObject(hdcc, hBitmap);
-                hdc = BeginPaint(win->data->hwnd, &ps);
-                GetClientRect(win->data->hwnd, &rect);
-#ifndef UNDER_CE
-                SetStretchBltMode(hdc, STRETCH_HALFTONE);
-#endif
-                StretchBlt(hdc, 0, 0, rect.right, rect.bottom, hdcc, 0, 0, win->fb.width, win->fb.height, SRCCOPY);
-
-                EndPaint(win->data->hwnd, &ps);
-
-                DeleteObject(hBitmap);
-                DeleteDC(hdcc);
+            case WM_QUIT:
+                rvvm_reset_machine(win->machine, false);
                 break;
-            }
             default:
                 DispatchMessage(&Msg);
                 break;