From 57829b7cc4e3a61be3bbbaeff59410becc1b0850 Mon Sep 17 00:00:00 2001
From: bruvzg <7645683+bruvzg@users.noreply.github.com>
Date: Sat, 3 Sep 2022 13:40:53 +0300
Subject: Re-enable per-pixel transparency support on Linux, macOS, and Windows
 (for Vulkan and OpenGL rendering drivers).

---
 platform/windows/display_server_windows.cpp | 25 +++++++++++++++++++++++--
 platform/windows/display_server_windows.h   |  5 -----
 2 files changed, 23 insertions(+), 7 deletions(-)

(limited to 'platform/windows')

diff --git a/platform/windows/display_server_windows.cpp b/platform/windows/display_server_windows.cpp
index 6530846c15..b4949de3f7 100644
--- a/platform/windows/display_server_windows.cpp
+++ b/platform/windows/display_server_windows.cpp
@@ -1312,7 +1312,28 @@ void DisplayServerWindows::window_set_flag(WindowFlags p_flag, bool p_enabled, W
 			_update_window_style(p_window);
 		} break;
 		case WINDOW_FLAG_TRANSPARENT: {
-			// FIXME: Implement.
+			if (p_enabled) {
+				//enable per-pixel alpha
+
+				DWM_BLURBEHIND bb = { 0 };
+				HRGN hRgn = CreateRectRgn(0, 0, -1, -1);
+				bb.dwFlags = DWM_BB_ENABLE | DWM_BB_BLURREGION;
+				bb.hRgnBlur = hRgn;
+				bb.fEnable = TRUE;
+				DwmEnableBlurBehindWindow(wd.hWnd, &bb);
+
+				wd.layered_window = true;
+			} else {
+				//disable per-pixel alpha
+				wd.layered_window = false;
+
+				DWM_BLURBEHIND bb = { 0 };
+				HRGN hRgn = CreateRectRgn(0, 0, -1, -1);
+				bb.dwFlags = DWM_BB_ENABLE | DWM_BB_BLURREGION;
+				bb.hRgnBlur = hRgn;
+				bb.fEnable = FALSE;
+				DwmEnableBlurBehindWindow(wd.hWnd, &bb);
+			}
 		} break;
 		case WINDOW_FLAG_NO_FOCUS: {
 			wd.no_focus = p_enabled;
@@ -1344,7 +1365,7 @@ bool DisplayServerWindows::window_get_flag(WindowFlags p_flag, WindowID p_window
 			return wd.always_on_top;
 		} break;
 		case WINDOW_FLAG_TRANSPARENT: {
-			// FIXME: Implement.
+			return wd.layered_window;
 		} break;
 		case WINDOW_FLAG_NO_FOCUS: {
 			return wd.no_focus;
diff --git a/platform/windows/display_server_windows.h b/platform/windows/display_server_windows.h
index afdf78b380..dbc9821970 100644
--- a/platform/windows/display_server_windows.h
+++ b/platform/windows/display_server_windows.h
@@ -352,7 +352,6 @@ class DisplayServerWindows : public DisplayServer {
 
 	struct WindowData {
 		HWND hWnd;
-		//layered window
 
 		Vector<Vector2> mpath;
 
@@ -392,10 +391,6 @@ class DisplayServerWindows : public DisplayServer {
 		Vector2 last_tilt;
 		bool last_pen_inverted = false;
 
-		HBITMAP hBitmap; //DIB section for layered window
-		uint8_t *dib_data = nullptr;
-		Size2 dib_size;
-		HDC hDC_dib;
 		Size2 min_size;
 		Size2 max_size;
 		int width = 0, height = 0;
-- 
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