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#include "WindowsDWM.h"
#include <stdlib.h>
#include <stdio.h>
// #define VERBOSE_ON 1
#ifdef VERBOSE_ON
#define DBG_PRINT(args...) fprintf(stderr, args);
#else
#define DBG_PRINT(args...)
#endif
/* GetProcAddress doesn't exist in A/W variants under desktop Windows */
#ifndef UNDER_CE
#define GetProcAddressA GetProcAddress
#endif
typedef HRESULT (WINAPI *DwmEnableCompositionPROCADDR)(UINT uCompositionAction);
typedef HRESULT (WINAPI *DwmIsCompositionEnabledPROCADDR)(BOOL * pfEnabled);
typedef HRESULT (WINAPI *DwmEnableBlurBehindWindowPROCADDR)(HWND hWnd, const DWM_BLURBEHIND* pBlurBehind);
typedef HRESULT (WINAPI *DwmExtendFrameIntoClientAreaPROCADDR)(HWND hwnd, const MARGINS *pMarInset);
static int _init = 0; // 1: init, 2: has DWM extension
static DwmEnableCompositionPROCADDR _DwmEnableComposition = NULL;
static DwmIsCompositionEnabledPROCADDR _DwmIsCompositionEnabled = NULL;
static DwmEnableBlurBehindWindowPROCADDR _DwmEnableBlurBehindWindow = NULL;
static DwmExtendFrameIntoClientAreaPROCADDR _DwmExtendFrameIntoClientArea = NULL;
static int initWindowsDWM() {
if(0 == _init) {
_init = 1;
HANDLE shell = LoadLibrary(TEXT("dwmapi.dll"));
if (shell) {
_DwmEnableComposition = (DwmEnableCompositionPROCADDR) GetProcAddressA (shell, "DwmEnableComposition");
_DwmIsCompositionEnabled = (DwmIsCompositionEnabledPROCADDR) GetProcAddressA (shell, "DwmIsCompositionEnabled");
_DwmEnableBlurBehindWindow = (DwmEnableBlurBehindWindowPROCADDR) GetProcAddressA (shell, "DwmEnableBlurBehindWindow");
_DwmExtendFrameIntoClientArea = (DwmExtendFrameIntoClientAreaPROCADDR) GetProcAddressA (shell, "DwmExtendFrameIntoClientArea");
if(NULL != _DwmEnableComposition && NULL != _DwmIsCompositionEnabled &&
NULL != _DwmEnableBlurBehindWindow && NULL != _DwmExtendFrameIntoClientArea) {
_init = 2;
}
}
// FreeLibrary (shell);
DBG_PRINT("DWM - initWindowsDWM: %d - s %p, e %p, c %p\n", _init, shell, _DwmEnableBlurBehindWindow, _DwmExtendFrameIntoClientArea);
}
return _init;
}
BOOL DwmIsExtensionAvailable() {
return (2 == initWindowsDWM()) ? TRUE : FALSE;
}
BOOL DwmIsCompositionEnabled( ) {
if(2 == initWindowsDWM()) {
BOOL fEnabled = FALSE;
if( 0 == _DwmIsCompositionEnabled(&fEnabled) ) {
DBG_PRINT("DWM - DwmIsCompositionEnabled: %d\n", fEnabled);
return fEnabled;
}
}
DBG_PRINT("DWM - DwmIsCompositionEnabled failed\n");
return FALSE;
}
BOOL DwmEnableComposition( UINT uCompositionAction ) {
if(2 == initWindowsDWM()) {
return 0 == _DwmEnableComposition(uCompositionAction) ? TRUE : FALSE;
}
return FALSE;
}
BOOL DwmEnableBlurBehindWindow(HWND hwnd, const DWM_BLURBEHIND* pBlurBehind) {
if(2 == initWindowsDWM()) {
_DwmEnableBlurBehindWindow(hwnd, pBlurBehind);
DBG_PRINT("DWM - DwmEnableBlurBehindWindow: hwnd %p, f %d, on %d, %p\n",
(void *)hwnd,
(int) pBlurBehind->dwFlags,
(int) pBlurBehind->fEnable,
(void *)pBlurBehind->hRgnBlur);
return TRUE;
}
DBG_PRINT("DWM - DwmEnableBlurBehindWindow: n/a\n");
return FALSE;
}
BOOL DwmExtendFrameIntoClientArea(HWND hwnd, const MARGINS *pMarInset) {
if(2 == initWindowsDWM()) {
_DwmExtendFrameIntoClientArea(hwnd, pMarInset);
return TRUE;
}
return FALSE;
}
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