Split utilities functions into separate files

src/utilities/winutils.cpp

@@ -0,0 +1,84 @@
+/*
+ * Strawberry Music Player
+ * Copyright 2018-2021, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <QtGlobal>
+
+#include <windows.h>
+#include <dwmapi.h>
+
+#include <QWindow>
+#include <QRegion>
+
+#include "winutils.h"
+
+namespace Utilities {
+
+HRGN qt_RectToHRGN(const QRect &rc);
+HRGN qt_RectToHRGN(const QRect &rc) {
+  return CreateRectRgn(rc.left(), rc.top(), rc.right() + 1, rc.bottom() + 1);
+}
+
+HRGN toHRGN(const QRegion &region);
+HRGN toHRGN(const QRegion &region) {
+
+#  if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+  return region.toHRGN();
+#  else
+
+  const int rect_count = region.rectCount();
+  if (rect_count == 0) {
+    return nullptr;
+  }
+
+  HRGN resultRgn = nullptr;
+  QRegion::const_iterator rects = region.begin();
+  resultRgn = qt_RectToHRGN(rects[0]);
+  for (int i = 1; i < rect_count; ++i) {
+    HRGN tmpRgn = qt_RectToHRGN(rects[i]);
+    const int res = CombineRgn(resultRgn, resultRgn, tmpRgn, RGN_OR);
+    if (res == ERROR) qWarning("Error combining HRGNs.");
+    DeleteObject(tmpRgn);
+  }
+
+  return resultRgn;
+
+#  endif  // Qt 6
+}
+
+void enableBlurBehindWindow(QWindow *window, const QRegion &region) {
+
+  DWM_BLURBEHIND dwmbb = { 0, 0, nullptr, 0 };
+  dwmbb.dwFlags = DWM_BB_ENABLE;
+  dwmbb.fEnable = TRUE;
+  HRGN rgn = nullptr;
+  if (!region.isNull()) {
+    rgn = toHRGN(region);
+    if (rgn) {
+      dwmbb.hRgnBlur = rgn;
+      dwmbb.dwFlags |= DWM_BB_BLURREGION;
+    }
+  }
+  DwmEnableBlurBehindWindow(reinterpret_cast<HWND>(window->winId()), &dwmbb);
+  if (rgn) {
+    DeleteObject(rgn);
+  }
+
+}
+
+}  // namespace Utilities