diff options
Diffstat (limited to 'src/newt/native/WindowsWindow.c')
| -rw-r--r-- | src/newt/native/WindowsWindow.c | 31 |
1 files changed, 24 insertions, 7 deletions
diff --git a/src/newt/native/WindowsWindow.c b/src/newt/native/WindowsWindow.c index c004f48a1..882559551 100644 --- a/src/newt/native/WindowsWindow.c +++ b/src/newt/native/WindowsWindow.c @@ -936,6 +936,7 @@ static void sendTouchScreenEvent(JNIEnv *env, jobject window, jNames, jX, jY, jPressure, (jfloat)maxPressure); } +// #define DO_ERASEBKGND 1 static LRESULT CALLBACK wndProc(HWND wnd, UINT message, WPARAM wParam, LPARAM lParam) { LRESULT res = 0; @@ -1077,9 +1078,15 @@ static LRESULT CALLBACK wndProc(HWND wnd, UINT message, WPARAM wParam, LPARAM lP case WM_PAINT: { if( wud->isInCreation ) { + #ifdef DO_ERASEBKGND if (GetUpdateRect(wnd, NULL, TRUE /* erase background */)) { DBG_PRINT("*** WindowsWindow: WM_PAINT.0 (dirty)\n"); // WM_ERASEBKGND sent! + #else + if (GetUpdateRect(wnd, NULL, FALSE /* do not erase background */)) { + DBG_PRINT("*** WindowsWindow: WM_PAINT.0 (dirty)\n"); + ValidateRect(wnd, NULL); // clear all! + #endif } else { DBG_PRINT("*** WindowsWindow: WM_PAINT.0 (clean)\n"); } @@ -1100,13 +1107,23 @@ static LRESULT CALLBACK wndProc(HWND wnd, UINT message, WPARAM wParam, LPARAM lP } case WM_ERASEBKGND: if( wud->isInCreation ) { - PAINTSTRUCT ps; - HDC hdc; - hdc = BeginPaint(wnd, &ps); - DBG_PRINT("*** WindowsWindow: WM_ERASEBKGND.0 (erasure) l/b %d/%d r/t %d/%d\n", - ps.rcPaint.left, ps.rcPaint.bottom, ps.rcPaint.right, ps.rcPaint.top); - FillRect(hdc, &ps.rcPaint, (HBRUSH)(COLOR_WINDOW+1)); - EndPaint(wnd, &ps); + #ifdef DO_ERASEBKGND + // On Windows the initial window is clean?! + // This fill destroys translucency on Windows 10 + // (which only seem to work on undecorated windows) + PAINTSTRUCT ps; + HDC hdc; + hdc = BeginPaint(wnd, &ps); + DBG_PRINT("*** WindowsWindow: WM_ERASEBKGND.0 (erasure) l/b %d/%d r/t %d/%d\n", + ps.rcPaint.left, ps.rcPaint.bottom, ps.rcPaint.right, ps.rcPaint.top); + // FillRect(hdc, &ps.rcPaint, (HBRUSH)(COLOR_WINDOW+1)); + // FillRect(hdc, &ps.rcPaint, (HBRUSH)(COLOR_APPWORKSPACE+1)); + // A black color also sets alpha to zero for translucency! + FillRect(hdc, &ps.rcPaint, (HBRUSH)GetStockObject(BLACK_PEN)); + EndPaint(wnd, &ps); + #else + ValidateRect(wnd, NULL); // clear all! + #endif res = 1; // return 1 == done } else { // ignore erase background, but let NEWT render the whole client area |