指定背景的淡入淡出

天云上人

创建步骤：
1、如果系统支持调色板，创建动态调色板pAnimate与初始调色板pOriginal。
从位图中获取初始调色板，若为淡入将背景色赋予动态调色板。利用前面所
提到的公式，根据淡入淡出标志，在循环中更改动态调色板，用AnimatePalette
  {  W* ]  E  k* k函数设置调色板，改变显示结果。
2、如果系统不支持调色板，保存位图调色板到初始调色板，若为淡入将背景
. ?' d, v& e5 ?: w, r6 J0 L色赋予位图调色板，利用前面所提到的公式，根据淡入淡出标志，在循环中更
改位图调色板，显示位图改变显示结果
返回：位图的淡入淡出
//参数说明：
//hDIB -位图句柄
8 c/ l4 k: a* [6 q8 j//color -指定背景色
5 v2 |' ^4 q0 k//xDest -显示位图的左上角x坐标
//yDest -显示位图的左上角y坐标
, w: Q! v' h# p: Z3 W% {/ Y, W: q//nLoops -循环次数
//nDelay -每次循环中的延时
//nFlag -淡入淡出标志 1--淡入 其它--淡出
1 v% D$ v. G* b! C" `6 wvoid FadeInORFadeOut( CDC *pDC, HANDLE hDIB, COLORREF color, int xDest, int yDest,
int nLoops, int nDelay ,int nFlag)
int i,j;
HPALETTE hPal;
PALETTEENTRY pAnimate[256];
PALETTEENTRY pOriginal[256];
CPalette pal;
// 创建236色调色板
* L; h6 k3 D* d2 R8 A5 l5 e　
( Q' j; S7 e" V% Q" d: UBITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
& G& u* Q# @- o$ z  i! Z  f3 q　
6 c% d! V" x6 J, f! U2 }' Aint nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount;
, L) A( A- Z9 I% d- A. pint nWidth = bmInfo.bmiHeader.biWidth;
int nHeight = bmInfo.bmiHeader.biHeight;
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
) p" B+ X3 l0 [0 u% Q4 b! m/ fint clrRValue = GetRValue(color);
; p+ k# \! S7 Mint clrGValue = GetGValue(color);
, f: H2 y4 w: s. {* nint clrBValue = GetBValue(color);
" J6 p3 B  g4 S& Iif( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
if (!(hPal = Create236Palette(hDIB)))
return;
pal.Attach( hPal );
3 g$ C3 K: ?4 B3 v- s# e/ S// 得到调色板初始值
/ S+ M( ?4 Q  \. \9 FGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
// 设定动态调色板初始值为指定色
if(nFlag==1)
for (j = 0; j < nColors; j++)
4 d; ~( Z( p, m3 ^4 x  _; z! zpAnimate[j].peRed = clrRValue;
pAnimate[j].peGreen = clrGValue;
pAnimate[j].peBlue = clrBValue;
pAnimate[j].peFlags = PC_RESERVED;
else
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
% X: u% T8 o% D* X0 m- SCPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
' i# [1 ]* h" j7 U/ c% T. i# RpDC->RealizePalette();
! R" r% J3 i0 F! J; }- O8 ?# ]" gCDC memDC;
5 b, `- o$ Z4 P" ^) P, p# N4 C& xmemDC.CreateCompatibleDC( pDC );
CBitmap bmp;
bmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
5 k" M/ ]  h  v" ^/ \* E, R4 x- j  \CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
CPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
memDC.RealizePalette();
::SetDIBitsToDevice(memDC.m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
AnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
pDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
* ^# Y" X# O5 R5 A2 W8 Y- q( H* N, i// 淡入淡出
for( i=1; i <= nLoops; i++ )
. W  ^$ m. z3 V" m* qfor (j = 0; j < nColors; j++)
if(nFlag==1)
pAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
pAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
9 T# t1 [# r2 {+ ^7 p4 vpAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
% r0 ]; ^6 g& k- Y% k% r6 PpAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
pAnimate[j].peGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen - clrGValue)*i)/nLoops;
# R' ^; r( u% I0 [7 H1 hpAnimate[j].peBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue - clrBValue)*i)/nLoops;
+ p  {* h# m: A: c8 p8 J+ W8 m8 ?pal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
// Delay...
; k: d  {6 t1 o7 A9 k8 [9 b+ |Sleep(nDelay);
memDC.SelectPalette(pOldMemPalette, FALSE);
  W% ]. X  p6 \5 Q; Q& {4 qmemDC.SelectObject( pOldBitmap );
pDC->SelectPalette(pOldPalette, FALSE);
else if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
for( int i=0; i < nColors; i++)
pOriginal.peRed = bmInfo.bmiColors.rgbRed ;
pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
pOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
, n  i2 y! i' s. `! a+ G" Lif(nFlag==1)
bmInfo.bmiColors.rgbRed = clrRValue;
bmInfo.bmiColors.rgbGreen = clrGValue;
bmInfo.bmiColors.rgbBlue = clrBValue;
6 i% z( O  T: S+ G, o( L' v/ F::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
// 淡入淡出
for( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
if(nFlag==1)
bmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
bmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
bmInfo.bmiColors[j].rgbBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
* l0 S; C* {& t; ]' oelse
bmInfo.bmiColors[j].rgbRed = pOriginal[j].peRed - ((pOriginal[j].peRed-clrRValue)*i)/nLoops;
bmInfo.bmiColors[j].rgbGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen-clrGValue)*i)/nLoops;
" X6 N" z7 y* a& c7 |bmInfo.bmiColors[j].rgbBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue-clrBValue)*i)/nLoops;
::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
// Delay...
! }/ {! g4 D  h1 ^, a. ySleep(nDelay);