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。
7 ^# Z2 e/ R6 `- l7 n8 K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
2 x3 h3 X: v, M6 o" @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
7 O  b, G9 _5 W, h( Y( _* F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
0 G0 p7 b- w% e; i# R% F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：
1 g) \% B$ k. C  ~/ o6 e  L. K8 |  K//hDIB -位图句柄
//color -指定背景色
//xDest -显示位图的左上角x坐标
//yDest -显示位图的左上角y坐标
//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
5 \* |  W% R' E4 r, a3 E# i6 I5 ~0 Jvoid FadeInORFadeOut( CDC *pDC, HANDLE hDIB, COLORREF color, int xDest, int yDest,
int nLoops, int nDelay ,int nFlag)
5 }$ F' e- O9 G. wint i,j;
6 Y, B  G. V) D9 {HPALETTE hPal;
' X* H$ K0 s, G8 u( oPALETTEENTRY pAnimate[256];
PALETTEENTRY pOriginal[256];
1 F# P5 G2 w! b6 p9 X" n$ sCPalette pal;
// 创建236色调色板
1 C+ P/ }& K" e: b　
" \- `' x! y! i' |BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
  }: ^/ p/ r4 V3 k" G　
int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount;
( J  W( O7 K9 O! |int nWidth = bmInfo.bmiHeader.biWidth;
8 t  C5 |9 a% O& u8 [int nHeight = bmInfo.bmiHeader.biHeight;
- a! j4 P/ c0 W* }3 C& _LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
int clrRValue = GetRValue(color);
int clrGValue = GetGValue(color);
/ N. D" a0 ?% Zint clrBValue = GetBValue(color);
if( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
4 Q7 T9 y* n8 f& tif (!(hPal = Create236Palette(hDIB)))
0 A/ b1 ^4 N9 oreturn;
pal.Attach( hPal );
// 得到调色板初始值
1 G* H9 g: o: rGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
7 a) G% M7 B  t0 n' \  ]// 设定动态调色板初始值为指定色
if(nFlag==1)
6 d+ C) d# @; u( p' s8 Afor (j = 0; j < nColors; j++)
( Y% Z" w/ ~2 }pAnimate[j].peRed = clrRValue;
0 _# G7 B/ \6 ~pAnimate[j].peGreen = clrGValue;
pAnimate[j].peBlue = clrBValue;
pAnimate[j].peFlags = PC_RESERVED;
+ ?2 G6 H* r5 |* z0 c$ A  N7 xelse
# k! R' e0 K8 KGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
CPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
pDC->RealizePalette();
$ c% p' x( Y5 [8 T/ q; rCDC memDC;
memDC.CreateCompatibleDC( pDC );
8 y- s' ?" ?0 LCBitmap bmp;
bmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
5 R" S9 x+ }0 FCBitmap *pOldBitmap = memDC.SelectObject( &bmp );
CPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
# d. d" @; ?# ?memDC.RealizePalette();
1 n/ }- U. o! C5 Q! K6 ~! g::SetDIBitsToDevice(memDC.m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
AnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
( V& s- v6 g/ |0 K+ ~' }$ [pDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
+ N' }+ I0 O$ M, p// 淡入淡出
7 {- I- U' G- t0 o% ]for( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
& F' o7 @4 R' f0 B- `- w: b8 O+ |0 Iif(nFlag==1)
pAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
pAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
1 d$ @% z3 {# n0 \' U# _pAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
2 {! M% u6 G" a2 \; T9 R0 B& Telse
pAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
, e9 s6 i* h5 V6 D! m: i, a  upAnimate[j].peGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen - clrGValue)*i)/nLoops;
pAnimate[j].peBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue - clrBValue)*i)/nLoops;
pal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
: u7 x1 _$ q9 x. i3 |: M// Delay...
Sleep(nDelay);
. ]+ \& d4 t% D6 ymemDC.SelectPalette(pOldMemPalette, FALSE);
memDC.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 ;
8 ~  G4 v( ?2 S* b' D. F2 i5 kif(nFlag==1)
bmInfo.bmiColors.rgbRed = clrRValue;
bmInfo.bmiColors.rgbGreen = clrGValue;
bmInfo.bmiColors.rgbBlue = clrBValue;
3 [7 `5 E7 J7 l; }* ~$ B::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
6 T! Q1 I1 g# o8 F6 z: k+ T// 淡入淡出
for( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
4 k7 [" M$ g, C% b7 [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;
else
/ @/ P1 i; v/ Q& ]bmInfo.bmiColors[j].rgbRed = pOriginal[j].peRed - ((pOriginal[j].peRed-clrRValue)*i)/nLoops;
( O4 G( q- Y' }% Z) m: Z( T* Q: T+ obmInfo.bmiColors[j].rgbGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen-clrGValue)*i)/nLoops;
* l. N" L; I  X1 ]; A! Y7 V3 K0 u. LbmInfo.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...
$ W' _2 ^1 w% j! m' @Sleep(nDelay);