gstreamer/subprojects/gst-plugins-bad/sys/directshow/strmbase/baseclasses/videoctl.cpp

746 lines
23 KiB
C++

//------------------------------------------------------------------------------
// File: VideoCtl.cpp
//
// Desc: DirectShow base classes.
//
// Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved.
//------------------------------------------------------------------------------
#include <streams.h>
#include "ddmm.h"
// Load a string from the resource file string table. The buffer must be at
// least STR_MAX_LENGTH bytes. The easiest way to use this is to declare a
// buffer in the property page class and use it for all string loading. It
// cannot be static as multiple property pages may be active simultaneously
LPTSTR WINAPI StringFromResource(__out_ecount(STR_MAX_LENGTH) LPTSTR pBuffer, int iResourceID)
{
if (LoadString(g_hInst,iResourceID,pBuffer,STR_MAX_LENGTH) == 0) {
return TEXT("");
}
return pBuffer;
}
#ifdef UNICODE
LPSTR WINAPI StringFromResource(__out_ecount(STR_MAX_LENGTH) LPSTR pBuffer, int iResourceID)
{
if (LoadStringA(g_hInst,iResourceID,pBuffer,STR_MAX_LENGTH) == 0) {
return "";
}
return pBuffer;
}
#endif
// Property pages typically are called through their OLE interfaces. These
// use UNICODE strings regardless of how the binary is built. So when we
// load strings from the resource file we sometimes want to convert them
// to UNICODE. This method is passed the target UNICODE buffer and does a
// convert after loading the string (if built UNICODE this is not needed)
// On WinNT we can explicitly call LoadStringW which saves two conversions
#ifndef UNICODE
LPWSTR WINAPI WideStringFromResource(__out_ecount(STR_MAX_LENGTH) LPWSTR pBuffer, int iResourceID)
{
*pBuffer = 0;
if (g_amPlatform == VER_PLATFORM_WIN32_NT) {
LoadStringW(g_hInst,iResourceID,pBuffer,STR_MAX_LENGTH);
} else {
CHAR szBuffer[STR_MAX_LENGTH];
DWORD dwStringLength = LoadString(g_hInst,iResourceID,szBuffer,STR_MAX_LENGTH);
// if we loaded a string convert it to wide characters, ensuring
// that we also null terminate the result.
if (dwStringLength++) {
MultiByteToWideChar(CP_ACP,0,szBuffer,dwStringLength,pBuffer,STR_MAX_LENGTH);
}
}
return pBuffer;
}
#endif
// Helper function to calculate the size of the dialog
BOOL WINAPI GetDialogSize(int iResourceID,
DLGPROC pDlgProc,
LPARAM lParam,
__out SIZE *pResult)
{
RECT rc;
HWND hwnd;
// Create a temporary property page
hwnd = CreateDialogParam(g_hInst,
MAKEINTRESOURCE(iResourceID),
GetDesktopWindow(),
pDlgProc,
lParam);
if (hwnd == NULL) {
return FALSE;
}
GetWindowRect(hwnd, &rc);
pResult->cx = rc.right - rc.left;
pResult->cy = rc.bottom - rc.top;
DestroyWindow(hwnd);
return TRUE;
}
// Class that aggregates on the IDirectDraw interface. Although DirectDraw
// has the ability in its interfaces to be aggregated they're not currently
// implemented. This makes it difficult for various parts of Quartz that want
// to aggregate these interfaces. In particular the video renderer passes out
// media samples that expose IDirectDraw and IDirectDrawSurface. The filter
// graph manager also exposes IDirectDraw as a plug in distributor. For these
// objects we provide these aggregation classes that republish the interfaces
STDMETHODIMP CAggDirectDraw::NonDelegatingQueryInterface(REFIID riid, __deref_out void **ppv)
{
ASSERT(m_pDirectDraw);
// Do we have this interface
if (riid == IID_IDirectDraw) {
return GetInterface((IDirectDraw *)this,ppv);
} else {
return CUnknown::NonDelegatingQueryInterface(riid,ppv);
}
}
STDMETHODIMP CAggDirectDraw::Compact()
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->Compact();
}
STDMETHODIMP CAggDirectDraw::CreateClipper(DWORD dwFlags, __deref_out LPDIRECTDRAWCLIPPER *lplpDDClipper, __inout_opt IUnknown *pUnkOuter)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->CreateClipper(dwFlags,lplpDDClipper,pUnkOuter);
}
STDMETHODIMP CAggDirectDraw::CreatePalette(DWORD dwFlags,
__in LPPALETTEENTRY lpColorTable,
__deref_out LPDIRECTDRAWPALETTE *lplpDDPalette,
__inout_opt IUnknown *pUnkOuter)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->CreatePalette(dwFlags,lpColorTable,lplpDDPalette,pUnkOuter);
}
STDMETHODIMP CAggDirectDraw::CreateSurface(__in LPDDSURFACEDESC lpDDSurfaceDesc,
__deref_out LPDIRECTDRAWSURFACE *lplpDDSurface,
__inout_opt IUnknown *pUnkOuter)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->CreateSurface(lpDDSurfaceDesc,lplpDDSurface,pUnkOuter);
}
STDMETHODIMP CAggDirectDraw::DuplicateSurface(__in LPDIRECTDRAWSURFACE lpDDSurface,
__deref_out LPDIRECTDRAWSURFACE *lplpDupDDSurface)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->DuplicateSurface(lpDDSurface,lplpDupDDSurface);
}
STDMETHODIMP CAggDirectDraw::EnumDisplayModes(DWORD dwSurfaceDescCount,
__in LPDDSURFACEDESC lplpDDSurfaceDescList,
__in LPVOID lpContext,
__in LPDDENUMMODESCALLBACK lpEnumCallback)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->EnumDisplayModes(dwSurfaceDescCount,lplpDDSurfaceDescList,lpContext,lpEnumCallback);
}
STDMETHODIMP CAggDirectDraw::EnumSurfaces(DWORD dwFlags,
__in LPDDSURFACEDESC lpDDSD,
__in LPVOID lpContext,
__in LPDDENUMSURFACESCALLBACK lpEnumCallback)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->EnumSurfaces(dwFlags,lpDDSD,lpContext,lpEnumCallback);
}
STDMETHODIMP CAggDirectDraw::FlipToGDISurface()
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->FlipToGDISurface();
}
STDMETHODIMP CAggDirectDraw::GetCaps(__out LPDDCAPS lpDDDriverCaps,__out LPDDCAPS lpDDHELCaps)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->GetCaps(lpDDDriverCaps,lpDDHELCaps);
}
STDMETHODIMP CAggDirectDraw::GetDisplayMode(__out LPDDSURFACEDESC lpDDSurfaceDesc)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->GetDisplayMode(lpDDSurfaceDesc);
}
STDMETHODIMP CAggDirectDraw::GetFourCCCodes(__inout LPDWORD lpNumCodes,__out_ecount(*lpNumCodes) LPDWORD lpCodes)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->GetFourCCCodes(lpNumCodes,lpCodes);
}
STDMETHODIMP CAggDirectDraw::GetGDISurface(__deref_out LPDIRECTDRAWSURFACE *lplpGDIDDSurface)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->GetGDISurface(lplpGDIDDSurface);
}
STDMETHODIMP CAggDirectDraw::GetMonitorFrequency(__out LPDWORD lpdwFrequency)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->GetMonitorFrequency(lpdwFrequency);
}
STDMETHODIMP CAggDirectDraw::GetScanLine(__out LPDWORD lpdwScanLine)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->GetScanLine(lpdwScanLine);
}
STDMETHODIMP CAggDirectDraw::GetVerticalBlankStatus(__out LPBOOL lpblsInVB)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->GetVerticalBlankStatus(lpblsInVB);
}
STDMETHODIMP CAggDirectDraw::Initialize(__in GUID *lpGUID)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->Initialize(lpGUID);
}
STDMETHODIMP CAggDirectDraw::RestoreDisplayMode()
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->RestoreDisplayMode();
}
STDMETHODIMP CAggDirectDraw::SetCooperativeLevel(HWND hWnd,DWORD dwFlags)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->SetCooperativeLevel(hWnd,dwFlags);
}
STDMETHODIMP CAggDirectDraw::SetDisplayMode(DWORD dwWidth,DWORD dwHeight,DWORD dwBpp)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->SetDisplayMode(dwWidth,dwHeight,dwBpp);
}
STDMETHODIMP CAggDirectDraw::WaitForVerticalBlank(DWORD dwFlags,HANDLE hEvent)
{
ASSERT(m_pDirectDraw);
return m_pDirectDraw->WaitForVerticalBlank(dwFlags,hEvent);
}
// Class that aggregates an IDirectDrawSurface interface. Although DirectDraw
// has the ability in its interfaces to be aggregated they're not currently
// implemented. This makes it difficult for various parts of Quartz that want
// to aggregate these interfaces. In particular the video renderer passes out
// media samples that expose IDirectDraw and IDirectDrawSurface. The filter
// graph manager also exposes IDirectDraw as a plug in distributor. For these
// objects we provide these aggregation classes that republish the interfaces
STDMETHODIMP CAggDrawSurface::NonDelegatingQueryInterface(REFIID riid, __deref_out void **ppv)
{
ASSERT(m_pDirectDrawSurface);
// Do we have this interface
if (riid == IID_IDirectDrawSurface) {
return GetInterface((IDirectDrawSurface *)this,ppv);
} else {
return CUnknown::NonDelegatingQueryInterface(riid,ppv);
}
}
STDMETHODIMP CAggDrawSurface::AddAttachedSurface(__in LPDIRECTDRAWSURFACE lpDDSAttachedSurface)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->AddAttachedSurface(lpDDSAttachedSurface);
}
STDMETHODIMP CAggDrawSurface::AddOverlayDirtyRect(__in LPRECT lpRect)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->AddOverlayDirtyRect(lpRect);
}
STDMETHODIMP CAggDrawSurface::Blt(__in LPRECT lpDestRect,
__in LPDIRECTDRAWSURFACE lpDDSrcSurface,
__in LPRECT lpSrcRect,
DWORD dwFlags,
__in LPDDBLTFX lpDDBltFx)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->Blt(lpDestRect,lpDDSrcSurface,lpSrcRect,dwFlags,lpDDBltFx);
}
STDMETHODIMP CAggDrawSurface::BltBatch(__in_ecount(dwCount) LPDDBLTBATCH lpDDBltBatch,DWORD dwCount,DWORD dwFlags)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->BltBatch(lpDDBltBatch,dwCount,dwFlags);
}
STDMETHODIMP CAggDrawSurface::BltFast(DWORD dwX,DWORD dwY,
__in LPDIRECTDRAWSURFACE lpDDSrcSurface,
__in LPRECT lpSrcRect,
DWORD dwTrans)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->BltFast(dwX,dwY,lpDDSrcSurface,lpSrcRect,dwTrans);
}
STDMETHODIMP CAggDrawSurface::DeleteAttachedSurface(DWORD dwFlags,
__in LPDIRECTDRAWSURFACE lpDDSAttachedSurface)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->DeleteAttachedSurface(dwFlags,lpDDSAttachedSurface);
}
STDMETHODIMP CAggDrawSurface::EnumAttachedSurfaces(__in LPVOID lpContext,
__in LPDDENUMSURFACESCALLBACK lpEnumSurfacesCallback)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->EnumAttachedSurfaces(lpContext,lpEnumSurfacesCallback);
}
STDMETHODIMP CAggDrawSurface::EnumOverlayZOrders(DWORD dwFlags,
__in LPVOID lpContext,
__in LPDDENUMSURFACESCALLBACK lpfnCallback)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->EnumOverlayZOrders(dwFlags,lpContext,lpfnCallback);
}
STDMETHODIMP CAggDrawSurface::Flip(__in LPDIRECTDRAWSURFACE lpDDSurfaceTargetOverride,DWORD dwFlags)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->Flip(lpDDSurfaceTargetOverride,dwFlags);
}
STDMETHODIMP CAggDrawSurface::GetAttachedSurface(__in LPDDSCAPS lpDDSCaps,
__deref_out LPDIRECTDRAWSURFACE *lplpDDAttachedSurface)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->GetAttachedSurface(lpDDSCaps,lplpDDAttachedSurface);
}
STDMETHODIMP CAggDrawSurface::GetBltStatus(DWORD dwFlags)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->GetBltStatus(dwFlags);
}
STDMETHODIMP CAggDrawSurface::GetCaps(__out LPDDSCAPS lpDDSCaps)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->GetCaps(lpDDSCaps);
}
STDMETHODIMP CAggDrawSurface::GetClipper(__deref_out LPDIRECTDRAWCLIPPER *lplpDDClipper)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->GetClipper(lplpDDClipper);
}
STDMETHODIMP CAggDrawSurface::GetColorKey(DWORD dwFlags,__out LPDDCOLORKEY lpDDColorKey)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->GetColorKey(dwFlags,lpDDColorKey);
}
STDMETHODIMP CAggDrawSurface::GetDC(__out HDC *lphDC)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->GetDC(lphDC);
}
STDMETHODIMP CAggDrawSurface::GetFlipStatus(DWORD dwFlags)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->GetFlipStatus(dwFlags);
}
STDMETHODIMP CAggDrawSurface::GetOverlayPosition(__out LPLONG lpdwX,__out LPLONG lpdwY)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->GetOverlayPosition(lpdwX,lpdwY);
}
STDMETHODIMP CAggDrawSurface::GetPalette(__deref_out LPDIRECTDRAWPALETTE *lplpDDPalette)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->GetPalette(lplpDDPalette);
}
STDMETHODIMP CAggDrawSurface::GetPixelFormat(__out LPDDPIXELFORMAT lpDDPixelFormat)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->GetPixelFormat(lpDDPixelFormat);
}
// A bit of a warning here: Our media samples in DirectShow aggregate on
// IDirectDraw and IDirectDrawSurface (ie are available through IMediaSample
// by QueryInterface). Unfortunately the underlying DirectDraw code cannot
// be aggregated so we have to use these classes. The snag is that when we
// call a different surface and pass in this interface as perhaps the source
// surface the call will fail because DirectDraw dereferences the pointer to
// get at its private data structures. Therefore we supply this workaround to give
// access to the real IDirectDraw surface. A filter can call GetSurfaceDesc
// and we will fill in the lpSurface pointer with the real underlying surface
STDMETHODIMP CAggDrawSurface::GetSurfaceDesc(__out LPDDSURFACEDESC lpDDSurfaceDesc)
{
ASSERT(m_pDirectDrawSurface);
// First call down to the underlying DirectDraw
HRESULT hr = m_pDirectDrawSurface->GetSurfaceDesc(lpDDSurfaceDesc);
if (FAILED(hr)) {
return hr;
}
// Store the real DirectDrawSurface interface
lpDDSurfaceDesc->lpSurface = m_pDirectDrawSurface;
return hr;
}
STDMETHODIMP CAggDrawSurface::Initialize(__in LPDIRECTDRAW lpDD,__in LPDDSURFACEDESC lpDDSurfaceDesc)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->Initialize(lpDD,lpDDSurfaceDesc);
}
STDMETHODIMP CAggDrawSurface::IsLost()
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->IsLost();
}
STDMETHODIMP CAggDrawSurface::Lock(__in LPRECT lpDestRect,
__inout LPDDSURFACEDESC lpDDSurfaceDesc,
DWORD dwFlags,
HANDLE hEvent)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->Lock(lpDestRect,lpDDSurfaceDesc,dwFlags,hEvent);
}
STDMETHODIMP CAggDrawSurface::ReleaseDC(HDC hDC)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->ReleaseDC(hDC);
}
STDMETHODIMP CAggDrawSurface::Restore()
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->Restore();
}
STDMETHODIMP CAggDrawSurface::SetClipper(__in LPDIRECTDRAWCLIPPER lpDDClipper)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->SetClipper(lpDDClipper);
}
STDMETHODIMP CAggDrawSurface::SetColorKey(DWORD dwFlags,__in LPDDCOLORKEY lpDDColorKey)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->SetColorKey(dwFlags,lpDDColorKey);
}
STDMETHODIMP CAggDrawSurface::SetOverlayPosition(LONG dwX,LONG dwY)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->SetOverlayPosition(dwX,dwY);
}
STDMETHODIMP CAggDrawSurface::SetPalette(__in LPDIRECTDRAWPALETTE lpDDPalette)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->SetPalette(lpDDPalette);
}
STDMETHODIMP CAggDrawSurface::Unlock(__in LPVOID lpSurfaceData)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->Unlock(lpSurfaceData);
}
STDMETHODIMP CAggDrawSurface::UpdateOverlay(__in LPRECT lpSrcRect,
__in LPDIRECTDRAWSURFACE lpDDDestSurface,
__in LPRECT lpDestRect,
DWORD dwFlags,
__in LPDDOVERLAYFX lpDDOverlayFX)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->UpdateOverlay(lpSrcRect,lpDDDestSurface,lpDestRect,dwFlags,lpDDOverlayFX);
}
STDMETHODIMP CAggDrawSurface::UpdateOverlayDisplay(DWORD dwFlags)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->UpdateOverlayDisplay(dwFlags);
}
STDMETHODIMP CAggDrawSurface::UpdateOverlayZOrder(DWORD dwFlags,__in LPDIRECTDRAWSURFACE lpDDSReference)
{
ASSERT(m_pDirectDrawSurface);
return m_pDirectDrawSurface->UpdateOverlayZOrder(dwFlags,lpDDSReference);
}
// DirectShow must work on multiple platforms. In particular, it also runs on
// Windows NT 3.51 which does not have DirectDraw capabilities. The filters
// cannot therefore link statically to the DirectDraw library. To make their
// lives that little bit easier we provide this class that manages loading
// and unloading the library and creating the initial IDirectDraw interface
CLoadDirectDraw::CLoadDirectDraw() :
m_pDirectDraw(NULL),
m_hDirectDraw(NULL)
{
}
// Destructor forces unload
CLoadDirectDraw::~CLoadDirectDraw()
{
ReleaseDirectDraw();
if (m_hDirectDraw) {
NOTE("Unloading library");
FreeLibrary(m_hDirectDraw);
}
}
// We can't be sure that DirectDraw is always available so we can't statically
// link to the library. Therefore we load the library, get the function entry
// point addresses and call them to create the driver objects. We return S_OK
// if we manage to load DirectDraw correctly otherwise we return E_NOINTERFACE
// We initialise a DirectDraw instance by explicitely loading the library and
// calling GetProcAddress on the DirectDrawCreate entry point that it exports
// On a multi monitor system, we can get the DirectDraw object for any
// monitor (device) with the optional szDevice parameter
HRESULT CLoadDirectDraw::LoadDirectDraw(__in LPSTR szDevice)
{
PDRAWCREATE pDrawCreate;
PDRAWENUM pDrawEnum;
LPDIRECTDRAWENUMERATEEXA pDrawEnumEx;
HRESULT hr = NOERROR;
NOTE("Entering DoLoadDirectDraw");
// Is DirectDraw already loaded
if (m_pDirectDraw) {
NOTE("Already loaded");
ASSERT(m_hDirectDraw);
return NOERROR;
}
// Make sure the library is available
if(!m_hDirectDraw)
{
UINT ErrorMode = SetErrorMode(SEM_NOOPENFILEERRORBOX);
m_hDirectDraw = LoadLibrary(TEXT("DDRAW.DLL"));
SetErrorMode(ErrorMode);
if (m_hDirectDraw == NULL) {
DbgLog((LOG_ERROR,1,TEXT("Can't load DDRAW.DLL")));
NOTE("No library");
return E_NOINTERFACE;
}
}
// Get the DLL address for the creator function
pDrawCreate = (PDRAWCREATE)GetProcAddress(m_hDirectDraw,"DirectDrawCreate");
// force ANSI, we assume it
pDrawEnum = (PDRAWENUM)GetProcAddress(m_hDirectDraw,"DirectDrawEnumerateA");
pDrawEnumEx = (LPDIRECTDRAWENUMERATEEXA)GetProcAddress(m_hDirectDraw,
"DirectDrawEnumerateExA");
// We don't NEED DirectDrawEnumerateEx, that's just for multimon stuff
if (pDrawCreate == NULL || pDrawEnum == NULL) {
DbgLog((LOG_ERROR,1,TEXT("Can't get functions: Create=%x Enum=%x"),
pDrawCreate, pDrawEnum));
NOTE("No entry point");
ReleaseDirectDraw();
return E_NOINTERFACE;
}
DbgLog((LOG_TRACE,3,TEXT("Creating DDraw for device %s"),
szDevice ? szDevice : "<NULL>"));
// Create a DirectDraw display provider for this device, using the fancy
// multimon-aware version, if it exists
if (pDrawEnumEx)
m_pDirectDraw = DirectDrawCreateFromDeviceEx(szDevice, pDrawCreate,
pDrawEnumEx);
else
m_pDirectDraw = DirectDrawCreateFromDevice(szDevice, pDrawCreate,
pDrawEnum);
if (m_pDirectDraw == NULL) {
DbgLog((LOG_ERROR,1,TEXT("Can't create DDraw")));
NOTE("No instance");
ReleaseDirectDraw();
return E_NOINTERFACE;
}
return NOERROR;
}
// Called to release any DirectDraw provider we previously loaded. We may be
// called at any time especially when something goes horribly wrong and when
// we need to clean up before returning so we can't guarantee that all state
// variables are consistent so free only those really allocated allocated
// This should only be called once all reference counts have been released
void CLoadDirectDraw::ReleaseDirectDraw()
{
NOTE("Releasing DirectDraw driver");
// Release any DirectDraw provider interface
if (m_pDirectDraw) {
NOTE("Releasing instance");
m_pDirectDraw->Release();
m_pDirectDraw = NULL;
}
}
// Return NOERROR (S_OK) if DirectDraw has been loaded by this object
HRESULT CLoadDirectDraw::IsDirectDrawLoaded()
{
NOTE("Entering IsDirectDrawLoaded");
if (m_pDirectDraw == NULL) {
NOTE("DirectDraw not loaded");
return S_FALSE;
}
return NOERROR;
}
// Return the IDirectDraw interface we look after
LPDIRECTDRAW CLoadDirectDraw::GetDirectDraw()
{
NOTE("Entering GetDirectDraw");
if (m_pDirectDraw == NULL) {
NOTE("No DirectDraw");
return NULL;
}
NOTE("Returning DirectDraw");
m_pDirectDraw->AddRef();
return m_pDirectDraw;
}
// Are we running on Direct Draw version 1? We need to find out as
// we rely on specific bug fixes in DirectDraw 2 for fullscreen playback. To
// find out, we simply see if it supports IDirectDraw2. Only version 2 and
// higher support this.
BOOL CLoadDirectDraw::IsDirectDrawVersion1()
{
if (m_pDirectDraw == NULL)
return FALSE;
IDirectDraw2 *p = NULL;
HRESULT hr = m_pDirectDraw->QueryInterface(IID_IDirectDraw2, (void **)&p);
if (p)
p->Release();
if (hr == NOERROR) {
DbgLog((LOG_TRACE,3,TEXT("Direct Draw Version 2 or greater")));
return FALSE;
} else {
DbgLog((LOG_TRACE,3,TEXT("Direct Draw Version 1")));
return TRUE;
}
}