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timewing.cp_
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1994-09-20
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948 lines
/**************************************************************************
TIMEWING.CPP - A timing demo for WinG
**************************************************************************/
/**************************************************************************
(C) Copyright 1994 Microsoft Corp. All rights reserved.
You have a royalty-free right to use, modify, reproduce and
distribute the Sample Files (and/or any modified version) in
any way you find useful, provided that you agree that
Microsoft has no warranty obligations or liability for any
Sample Application Files which are modified.
**************************************************************************/
#include <windows.h>
#include <windowsx.h>
#include <commdlg.h>
#include "timewing.h"
#include <string.h>
#include <mmsystem.h>
#include <fstream.h>
#include <strstrea.h>
#include <wing.h>
#include "..\utils\utils.h"
/*----------------------------------------------------------------------------*\
| |
| g l o b a l v a r i a b l e s |
| |
\*----------------------------------------------------------------------------*/
static char szAppName[]="WinG Timer Sample";
static char szAppFilter[]="Bitmaps\0*.bmp\0";
static HINSTANCE hInstApp;
HWND hwndApp;
static HPALETTE hpalApp;
static BOOL fAppActive;
static int dx, dy;
PDIB pCurrentDIB;
char aDescription[200];
char aBuffer[5000];
UINT CurrentDIBUsage;
struct
{
BITMAPINFOHEADER Header;
RGBQUAD aColors[256];
} Info;
int Iterations = 100;
int StretchMenu = 0;
float StretchFactor = 1;
/*----------------------------------------------------------------------------
Timers
*/
struct timing_result;
typedef void timer( timing_result *pResults, HWND Window );
timer TimeStretchBlt;
timer TimeStretchDIBits;
timer TimeWinGBU;
timer TimeWinGTD;
/*----------------------------------------------------------------------------
Timer structure.
*/
void PrintTimingResults( ostream &Out );
struct timing_result
{
DWORD Time;
timer *pTimer;
char const *pDescription;
} aTimings[] =
{
0, TimeStretchBlt, "StretchBlt",
0, TimeStretchDIBits, "StretchDIBits",
0, TimeWinGTD, "WinGStretchBlt top-down",
0, TimeWinGBU, "WinGStretchBlt bottom-up",
};
int const NumberOfTimings = sizeof(aTimings) / sizeof(aTimings[0]);
#if defined(WIN32) || defined(_WIN32)
#define _export
#endif
/*----------------------------------------------------------------------------*\
| |
| f u n c t i o n d e f i n i t i o n s |
| |
\*----------------------------------------------------------------------------*/
LONG FAR PASCAL _export AppWndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam);
int ErrMsg (LPSTR sz,...);
LONG AppCommand (HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam);
void AppExit(void);
BOOL AppIdle(void);
void AppOpenFile(HWND hwnd, LPSTR szFileName);
/*----------------------------------------------------------------------------*\
| AppAbout( hDlg, uiMessage, wParam, lParam ) |
| |
| Description: |
| This function handles messages belonging to the "About" dialog box. |
| The only message that it looks for is WM_COMMAND, indicating the use |
| has pressed the "OK" button. When this happens, it takes down |
| the dialog box. |
| |
| Arguments: |
| hDlg window handle of about dialog window |
| uiMessage message number |
| wParam message-dependent |
| lParam message-dependent |
| |
| Returns: |
| TRUE if message has been processed, else FALSE |
| |
\*----------------------------------------------------------------------------*/
BOOL FAR PASCAL _export AppAbout(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
switch (msg)
{
case WM_COMMAND:
if (LOWORD(wParam) == IDOK)
{
EndDialog(hwnd,TRUE);
}
break;
case WM_INITDIALOG:
return TRUE;
}
return FALSE;
}
/*----------------------------------------------------------------------------*\
| AppInit( hInst, hPrev) |
| |
| Description: |
| This is called when the application is first loaded into |
| memory. It performs all initialization that doesn't need to be done |
| once per instance. |
| |
| Arguments: |
| hInstance instance handle of current instance |
| hPrev instance handle of previous instance |
| |
| Returns: |
| TRUE if successful, FALSE if not |
| |
\*----------------------------------------------------------------------------*/
BOOL AppInit(HINSTANCE hInst,HINSTANCE hPrev,int sw,LPSTR szCmdLine)
{
WNDCLASS cls;
/* Save instance handle for DialogBoxes */
hInstApp = hInst;
// Clear the System Palette so that WinGStretchBlt runs at full speed.
ClearSystemPalette();
if (!hPrev)
{
/*
* Register a class for the main application window
*/
cls.hCursor = LoadCursor(NULL,IDC_ARROW);
cls.hIcon = LoadIcon(hInst,"AppIcon");
cls.lpszMenuName = "AppMenu";
cls.lpszClassName = szAppName;
cls.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
cls.hInstance = hInst;
cls.style = CS_BYTEALIGNCLIENT | CS_VREDRAW | CS_HREDRAW | CS_DBLCLKS;
cls.lpfnWndProc = (WNDPROC)AppWndProc;
cls.cbWndExtra = 0;
cls.cbClsExtra = 0;
if (!RegisterClass(&cls))
return FALSE;
}
dx = 400;
dy = 400;
hwndApp = CreateWindow (szAppName, // Class name
szAppName, // Caption
WS_OVERLAPPEDWINDOW, // Style bits
50, 50, // Position
dx+20,dy+75, // Size
(HWND)NULL, // Parent window (no parent)
(HMENU)NULL, // use class menu
hInst, // handle to window instance
(LPSTR)NULL // no params to pass on
);
ShowWindow(hwndApp,sw);
HMENU Menu = GetMenu(hwndApp);
CheckMenuItem(Menu,MENU_1TO1,MF_CHECKED);
//
// build the timing menu.
//
HMENU hmenu = GetSubMenu(Menu, 3);
DeleteMenu(hmenu, MENU_TIME, MF_BYCOMMAND);
for (int i=0; i<NumberOfTimings; i++)
{
AppendMenu(hmenu, 0, MENU_TIME+i, aTimings[i].pDescription);
}
hpalApp = WinGCreateHalftonePalette();
AppOpenFile(hwndApp,"frog.bmp");
if(!pCurrentDIB)
{
// we couldn't load froggie
PostMessage(hwndApp,WM_COMMAND,MENU_OPEN,0);
}
return TRUE;
}
/*----------------------------------------------------------------------------*\
| AppExit() |
| |
| Description: |
| App is just about to exit, cleanup. |
| |
\*----------------------------------------------------------------------------*/
void AppExit()
{
DeleteObject(hpalApp);
}
/*----------------------------------------------------------------------------*\
| WinMain( hInst, hPrev, lpszCmdLine, cmdShow ) |
| |
| Description: |
| The main procedure for the App. After initializing, it just goes |
| into a message-processing loop until it gets a WM_QUIT message |
| (meaning the app was closed). |
| |
| Arguments: |
| hInst instance handle of this instance of the app |
| hPrev instance handle of previous instance, NULL if first |
| szCmdLine ->null-terminated command line |
| cmdShow specifies how the window is initially displayed |
| |
| Returns: |
| The exit code as specified in the WM_QUIT message. |
| |
\*----------------------------------------------------------------------------*/
int PASCAL WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR szCmdLine, int sw)
{
MSG msg;
/* Call initialization procedure */
if (!AppInit(hInst,hPrev,sw,szCmdLine))
return FALSE;
/*
* Polling messages from event queue
*/
for (;;)
{
if (PeekMessage(&msg, NULL, 0, 0,PM_REMOVE))
{
if (msg.message == WM_QUIT)
break;
TranslateMessage(&msg);
DispatchMessage(&msg);
}
else
{
if (AppIdle())
WaitMessage();
}
}
AppExit();
return msg.wParam;
}
/*----------------------------------------------------------------------------*\
| AppIdle()
|
| Description:
| Place to do idle time stuff.
|
\*----------------------------------------------------------------------------*/
BOOL AppIdle()
{
if (fAppActive)
{
//
// we are the foreground app.
//
return TRUE; // nothing to do.
}
else
{
//
// we are a background app.
//
return TRUE; // nothing to do.
}
}
/*----------------------------------------------------------------------------*\
| AppOpenFile()
|
| Description:
| Open a file.
|
\*----------------------------------------------------------------------------*/
void AppOpenFile(HWND hwnd, LPSTR szFileName)
{
PDIB pDIB = DibOpenFile(szFileName);
if(pDIB)
{
if(pCurrentDIB)
{
DibFree(pCurrentDIB);
}
pCurrentDIB = pDIB;
// Map the dib to the palette if it's not 4-bit
if (DibBitCount(pDIB) != 4)
{
DibMapToPalette(pCurrentDIB,hpalApp);
CurrentDIBUsage = DIB_PAL_COLORS;
hmemcpy(&Info,pDIB,sizeof(Info));
DibSetUsage(pCurrentDIB,hpalApp,CurrentDIBUsage);
}
else
{
CurrentDIBUsage = DIB_RGB_COLORS;
}
ostrstream Out(aDescription,sizeof(aDescription));
while(*szFileName)
{
Out<<*szFileName++; // can't use far * and near stream.
}
Out<<" - "<<DibWidth(pDIB)<<" x "<<DibHeight(pDIB)<<ends;
SetWindowText(hwnd,aDescription);
}
}
/*----------------------------------------------------------------------------*\
| AppPaint(hwnd, hdc)
|
| Description:
| The paint function.
|
| Arguments:
| hwnd window painting into
| hdc display context to paint to
|
\*----------------------------------------------------------------------------*/
AppPaint (HWND hwnd, HDC hdc)
{
RECT rc;
GetClientRect(hwnd,&rc);
SetTextColor(hdc,GetSysColor(COLOR_WINDOWTEXT));
SetBkColor(hdc,GetSysColor(COLOR_WINDOW));
return TRUE;
}
/*----------------------------------------------------------------------------*\
| AppWndProc( hwnd, uiMessage, wParam, lParam ) |
| |
| Description: |
| The window proc for the app's main (tiled) window. This processes all |
| of the parent window's messages. |
| |
\*----------------------------------------------------------------------------*/
LONG FAR PASCAL _export AppWndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
PAINTSTRUCT ps;
HDC hdc;
BOOL f;
switch (msg)
{
case WM_CREATE:
break;
case WM_ACTIVATEAPP:
fAppActive = (BOOL)wParam;
break;
case WM_TIMER:
break;
case WM_ERASEBKGND:
break;
case WM_INITMENU:
break;
case WM_COMMAND:
return AppCommand(hwnd,msg,wParam,lParam);
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_CLOSE:
break;
case WM_SIZE:
{
static FirstTime = 1;
if(FirstTime)
{
FirstTime = 0;
break;
}
else
{
return 0;
break;
}
}
case WM_PALETTECHANGED:
if ((HWND)wParam == hwnd)
break;
// fall through to WM_QUERYNEWPALETTE
case WM_QUERYNEWPALETTE:
hdc = GetDC(hwnd);
if (hpalApp)
SelectPalette(hdc, hpalApp, FALSE);
f = RealizePalette(hdc);
ReleaseDC(hwnd,hdc);
if (f)
InvalidateRect(hwnd,NULL,TRUE);
return f;
case WM_PAINT:
hdc = BeginPaint(hwnd,&ps);
AppPaint (hwnd,hdc);
EndPaint(hwnd,&ps);
return 0L;
}
return DefWindowProc(hwnd,msg,wParam,lParam);
}
/*----------------------------------------------------------------------------*\
| AppCommand(hwnd, msg, wParam, lParam ) |
| |
| Description: |
| Handles WM_COMMAND messages for the main window (hwndApp) |
| of the parent window's messages. |
| |
\*----------------------------------------------------------------------------*/
LONG AppCommand (HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
static char achFileName[128];
OPENFILENAME ofn;
ostrstream Out(aBuffer,sizeof(aBuffer));
int PrevStretchMenu;
int i;
switch(wParam)
{
case MENU_ABOUT:
DialogBox(hInstApp,"AppAbout",hwnd,(DLGPROC)AppAbout);
break;
case MENU_TIMEALL:
{
HCURSOR Arror = SetCursor(0);
for(int Counter = 0;Counter < NumberOfTimings;Counter++)
{
SetWindowText(hwndApp,aTimings[Counter].pDescription);
(*aTimings[Counter].pTimer)(aTimings+Counter,hwnd);
}
SetCursor(Arror);
SetWindowText(hwndApp,aDescription);
PrintTimingResults(Out);
MessageBox(0,aBuffer,"Timing Results",MB_OK);
break;
}
case MENU_1TO1:
case MENU_1TO2:
case MENU_1TOALMOST2:
{
float aStretchFactors[3] = { 1, 2, 1.9 };
HMENU Menu = GetMenu(hwnd);
// uncheck current selection
CheckMenuItem(Menu,MENU_1TO1 + StretchMenu,MF_UNCHECKED);
PrevStretchMenu = StretchMenu;
StretchMenu = wParam - MENU_1TO1;
// get the stretch factor
StretchFactor = aStretchFactors[StretchMenu];
Iterations = (StretchFactor == 1) ? 100 : 20;
CheckMenuItem(Menu,wParam,MF_CHECKED);
if (StretchMenu != PrevStretchMenu)
{
for (i = 0; i < NumberOfTimings; i++)
aTimings[i].Time = 0;
}
break;
}
default:
{
int Index = (int)LOWORD(wParam) - MENU_TIME;
if(Index >= 0 && Index < NumberOfTimings)
{
HCURSOR Arror = SetCursor(0);
SetWindowText(hwndApp,aTimings[Index].pDescription);
(*aTimings[Index].pTimer)(aTimings+Index,hwnd);
SetCursor(Arror);
SetWindowText(hwndApp,aDescription);
}
PrintTimingResults(Out);
MessageBox(0,aBuffer,"Timing Results",MB_OK);
InvalidateRect(hwnd,0,TRUE);
UpdateWindow(hwnd);
break;
}
case MENU_OPEN:
{
/* prompt user for file to open */
ofn.lStructSize = sizeof(OPENFILENAME);
ofn.hwndOwner = hwnd;
ofn.hInstance = NULL;
ofn.lpstrFilter = szAppFilter;
ofn.lpstrCustomFilter = NULL;
ofn.nMaxCustFilter = 0;
ofn.nFilterIndex = 0;
ofn.lpstrFile = achFileName;
ofn.nMaxFile = sizeof(achFileName);
ofn.lpstrFileTitle = NULL;
ofn.nMaxFileTitle = 0;
ofn.lpstrInitialDir = NULL;
ofn.lpstrTitle = NULL;
ofn.Flags = OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST | OFN_HIDEREADONLY;
ofn.nFileOffset = 0;
ofn.nFileExtension = 0;
ofn.lpstrDefExt = NULL;
ofn.lCustData = 0;
ofn.lpfnHook = NULL;
ofn.lpTemplateName = NULL;
if(GetOpenFileName(&ofn))
{
AppOpenFile(hwnd,achFileName);
break;
}
}
break;
case MENU_EXIT:
PostMessage(hwnd,WM_CLOSE,0,0L);
break;
}
return 0L;
}
/*----------------------------------------------------------------------------*\
| ErrMsg - Opens a Message box with a error message in it. The user can |
| select the OK button to continue |
\*----------------------------------------------------------------------------*/
int ErrMsg (LPSTR sz,...)
{
char ach[128];
wvsprintf (ach,sz,(LPSTR)(&sz+1)); /* Format the string */
MessageBox(hwndApp,ach,szAppName,MB_OK|MB_ICONEXCLAMATION|MB_TASKMODAL);
return FALSE;
}
void PrintTimingResults( ostream &Out )
{
int CurrentOffset = 0;
for(int Counter = 0;Counter < NumberOfTimings;Counter++)
{
Out<<aTimings[Counter].pDescription
<<":\t";
if(aTimings[Counter].Time)
{
Out.setf(ios::fixed | ios::showpoint);
Out.width(6);
Out.precision(2);
Out<<(Iterations / (aTimings[Counter].Time / 1000.0))<<" per Second"<<endl;
}
else
{
Out<<"Not timed yet"<<endl;
}
}
Out<<ends;
}
/*----------------------------------------------------------------------------
StretchBlt
*/
void TimeStretchBlt( timing_result *pResult, HWND Window )
{
int Counter;
HDC Screen = GetDC(Window);
DWORD Time;
// setup here
HDC Buffer = CreateCompatibleDC(Screen);
HBITMAP Bitmap = CreateCompatibleBitmap(Screen,DibWidth(pCurrentDIB),
DibHeight(pCurrentDIB));
Bitmap = SelectBitmap(Buffer,Bitmap);
HPALETTE OldPalette = SelectPalette(Buffer,hpalApp,FALSE);
SelectPalette(Screen,hpalApp,FALSE);
RealizePalette(Screen);
RealizePalette(Buffer);
SetStretchBltMode(Buffer,COLORONCOLOR);
StretchDIBits(Buffer,0,0,DibWidth(pCurrentDIB),DibHeight(pCurrentDIB),
0,0,DibWidth(pCurrentDIB),DibHeight(pCurrentDIB),DibPtr(pCurrentDIB),
DibInfo(pCurrentDIB),CurrentDIBUsage,SRCCOPY);
SetStretchBltMode(Screen,COLORONCOLOR);
int Width = StretchFactor * DibWidth(pCurrentDIB);
int Height = StretchFactor * DibHeight(pCurrentDIB);
Time = timeGetTime();
for(Counter = 0;Counter < Iterations;Counter++)
{
StretchBlt(Screen,Counter,Counter,Width,Height,
Buffer,0,0,DibWidth(pCurrentDIB),DibHeight(pCurrentDIB),
SRCCOPY);
}
Time = timeGetTime() - Time;
pResult->Time = Time;
// clean up
SelectPalette(Buffer,OldPalette,FALSE);
SelectPalette(Screen,OldPalette,FALSE);
DeleteObject(SelectBitmap(Buffer,Bitmap));
DeleteDC(Buffer);
ReleaseDC(Window,Screen);
}
/*----------------------------------------------------------------------------
StretchDIBits
*/
void TimeStretchDIBits( timing_result *pResult, HWND Window )
{
int Counter;
HDC Screen = GetDC(Window);
DWORD Time;
// setup here
HPALETTE OldPalette = SelectPalette(Screen,hpalApp,FALSE);
RealizePalette(Screen);
int Width = StretchFactor * DibWidth(pCurrentDIB);
int Height = StretchFactor * DibHeight(pCurrentDIB);
Time = timeGetTime();
for(Counter = 0;Counter < Iterations;Counter++)
{
StretchDIBits(Screen,Counter,Counter,Width,Height,
0,0,DibWidth(pCurrentDIB),DibHeight(pCurrentDIB),
DibPtr(pCurrentDIB),DibInfo(pCurrentDIB),CurrentDIBUsage,SRCCOPY);
}
Time = timeGetTime() - Time;
pResult->Time = Time;
// clean up
SelectPalette(Screen,OldPalette,FALSE);
ReleaseDC(Window,Screen);
}
/*----------------------------------------------------------------------------
WinGStretchBlt - bottom-up
*/
void TimeWinGBU( timing_result *pResult, HWND Window )
{
int Counter;
HDC Screen = GetDC(Window);
DWORD Time;
void far *pBits;
// setup here
HDC WinGDC = WinGCreateDC();
Info.Header.biSize = sizeof(BITMAPINFOHEADER);
Info.Header.biWidth = DibWidth(pCurrentDIB);
// NOTE! You should use the WinGRecommendedDIBFormat for your WinGBitmaps.
// This is forced to bottom-up for this example. See the WinG.HLP file.
Info.Header.biHeight = DibHeight(pCurrentDIB);
HBITMAP WinGBitmap = WinGCreateBitmap(WinGDC,(BITMAPINFO far *)&Info,
&pBits);
WinGBitmap = SelectBitmap(WinGDC,WinGBitmap);
HPALETTE OldPalette = SelectPalette(Screen,hpalApp,FALSE);
RealizePalette(Screen);
// We're selecting a palette into the WinGDC so we can use the
// DIB_PAL_COLORS pCurrentDIB. This does NOT change the WinGBitmap's
// color table, but GDI needs to look up the DIB_PAL_COLORS somewhere!
// Different devices can't share a palette, so we need another copy.
HPALETTE WinGPalette = WinGCreateHalftonePalette();
HPALETTE OldWinGPalette = SelectPalette(WinGDC,WinGPalette,FALSE);
RealizePalette(WinGDC);
SetStretchBltMode(WinGDC,COLORONCOLOR);
StretchDIBits(WinGDC,0,0,DibWidth(pCurrentDIB),DibHeight(pCurrentDIB),
0,0,DibWidth(pCurrentDIB),DibHeight(pCurrentDIB),DibPtr(pCurrentDIB),
DibInfo(pCurrentDIB),CurrentDIBUsage,SRCCOPY);
// we just needed the palette for the StretchDIBits
SelectPalette(WinGDC,OldWinGPalette,FALSE);
DeleteObject(WinGPalette);
int Width = StretchFactor * DibWidth(pCurrentDIB);
int Height = StretchFactor * DibHeight(pCurrentDIB);
// WinG does a lot of work on the first blt, so do it outside the loop
WinGStretchBlt(Screen,0,0,Width,Height,
WinGDC,0,0,DibWidth(pCurrentDIB),
DibHeight(pCurrentDIB));
Time = timeGetTime();
for(Counter = 0;Counter < Iterations;Counter++)
{
WinGStretchBlt(Screen,Counter,Counter,Width,Height,
WinGDC,0,0,DibWidth(pCurrentDIB),
DibHeight(pCurrentDIB));
}
Time = timeGetTime() - Time;
pResult->Time = Time;
// clean up
SelectPalette(Screen,OldPalette,FALSE);
SelectPalette(WinGDC,OldPalette,FALSE);
DeleteObject(SelectBitmap(WinGDC,WinGBitmap));
DeleteDC(WinGDC);
ReleaseDC(Window,Screen);
}
/*----------------------------------------------------------------------------
WinGStretchBlt - top-down
*/
void TimeWinGTD( timing_result *pResult, HWND Window )
{
int Counter;
HDC Screen = GetDC(Window);
DWORD Time;
void far *pBits;
// setup here
HDC WinGDC = WinGCreateDC();
Info.Header.biSize = sizeof(BITMAPINFOHEADER);
Info.Header.biWidth = DibWidth(pCurrentDIB);
// NOTE! You should use the WinGRecommendedDIBFormat for your WinGBitmaps.
// This is forced to top-down for this example. See the WinG.HLP file.
Info.Header.biHeight = -int(DibHeight(pCurrentDIB));
HBITMAP WinGBitmap = WinGCreateBitmap(WinGDC,(BITMAPINFO far *)&Info,
&pBits);
WinGBitmap = SelectBitmap(WinGDC,WinGBitmap);
HPALETTE OldPalette = SelectPalette(Screen,hpalApp,FALSE);
RealizePalette(Screen);
// We're selecting a palette into the WinGDC so we can use the
// DIB_PAL_COLORS pCurrentDIB. This does NOT change the WinGBitmap's
// color table, but GDI needs to look up the DIB_PAL_COLORS somewhere!
// Different devices can't share a palette, so we need another copy.
HPALETTE WinGPalette = WinGCreateHalftonePalette();
HPALETTE OldWinGPalette = SelectPalette(WinGDC,WinGPalette,FALSE);
RealizePalette(WinGDC);
SetStretchBltMode(WinGDC,COLORONCOLOR);
StretchDIBits(WinGDC,0,0,DibWidth(pCurrentDIB),DibHeight(pCurrentDIB),
0,0,DibWidth(pCurrentDIB),DibHeight(pCurrentDIB),DibPtr(pCurrentDIB),
DibInfo(pCurrentDIB),CurrentDIBUsage,SRCCOPY);
// we just needed the palette for the StretchDIBits
SelectPalette(WinGDC,OldWinGPalette,FALSE);
DeleteObject(WinGPalette);
int Width = StretchFactor * DibWidth(pCurrentDIB);
int Height = StretchFactor * DibHeight(pCurrentDIB);
// WinG does a lot of work on the first blt, so do it outside the loop
WinGStretchBlt(Screen,0,0,Width,Height,
WinGDC,0,0,DibWidth(pCurrentDIB),
DibHeight(pCurrentDIB));
Time = timeGetTime();
for(Counter = 0;Counter < Iterations;Counter++)
{
WinGStretchBlt(Screen,Counter,Counter,Width,Height,
WinGDC,0,0,DibWidth(pCurrentDIB),
DibHeight(pCurrentDIB));
}
Time = timeGetTime() - Time;
pResult->Time = Time;
// clean up
SelectPalette(Screen,OldPalette,FALSE);
SelectPalette(WinGDC,OldPalette,FALSE);
DeleteObject(SelectBitmap(WinGDC,WinGBitmap));
DeleteDC(WinGDC);
ReleaseDC(Window,Screen);
}