1 files changed, 76 insertions, 0 deletions
diff --git a/plug-ins/screenshot/screenshot-win32-dwm-api.h b/plug-ins/screenshot/screenshot-win32-dwm-api.h
new file mode 100644
index 0000000..5f5c0f9
--- /dev/null
+++ b/plug-ins/screenshot/screenshot-win32-dwm-api.h
@@ -0,0 +1,76 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * screenshot-win32-dwm-api.h
+ * Copyright (C) 2018 Gil Eliyahu <gileli121@gmail.com>
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+void UnloadRequiredDwmFunctions (void);
+BOOL LoadRequiredDwmFunctions (void);
+
+typedef HRESULT (WINAPI* DWMGETWINDOWATTRIBUTE)(HWND, DWORD, _Out_ PVOID, DWORD);
+DWMGETWINDOWATTRIBUTE DwmGetWindowAttribute;
+
+typedef enum _DWMWINDOWATTRIBUTE {
+  DWMWA_NCRENDERING_ENABLED = 1,
+  DWMWA_NCRENDERING_POLICY,
+  DWMWA_TRANSITIONS_FORCEDISABLED,
+  DWMWA_ALLOW_NCPAINT,
+  DWMWA_CAPTION_BUTTON_BOUNDS,
+  DWMWA_NONCLIENT_RTL_LAYOUT,
+  DWMWA_FORCE_ICONIC_REPRESENTATION,
+  DWMWA_FLIP3D_POLICY,
+  DWMWA_EXTENDED_FRAME_BOUNDS,
+  DWMWA_HAS_ICONIC_BITMAP,
+  DWMWA_DISALLOW_PEEK,
+  DWMWA_EXCLUDED_FROM_PEEK,
+  DWMWA_CLOAK,
+  DWMWA_CLOAKED,
+  DWMWA_FREEZE_REPRESENTATION,
+  DWMWA_LAST
+} DWMWINDOWATTRIBUTE;
+
+typedef HRESULT (WINAPI* DWMISCOMPOSITIONENABLED) (BOOL *pfEnabled);
+DWMISCOMPOSITIONENABLED DwmIsCompositionEnabled;
+
+static HMODULE dwmApi = NULL;
+
+void
+UnloadRequiredDwmFunctions (void)
+{
+  if (! dwmApi) return;
+  FreeLibrary(dwmApi);
+  dwmApi = NULL;
+}
+
+BOOL
+LoadRequiredDwmFunctions (void)
+{
+  if (dwmApi) return TRUE;
+
+  dwmApi = LoadLibrary ("dwmapi");
+  if (! dwmApi) return FALSE;
+
+  DwmGetWindowAttribute = (DWMGETWINDOWATTRIBUTE) GetProcAddress (dwmApi, "DwmGetWindowAttribute");
+  DwmIsCompositionEnabled = (DWMISCOMPOSITIONENABLED) GetProcAddress (dwmApi, "DwmIsCompositionEnabled");
+  if (! (DwmGetWindowAttribute && DwmIsCompositionEnabled))
+  {
+    UnloadRequiredDwmFunctions ();
+    return FALSE;
+  }
+
+  return TRUE;
+}