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/* 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;
}
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