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
0 {4 P* }0 ~/ @' ]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
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
, ?( Y1 x. m5 w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
" `3 r& v9 P6 d) ?, k. |+ \) a# W3 b返回：位图的淡入淡出
//参数说明：
( U+ b- ?6 w  X# v/ j//hDIB -位图句柄
! B+ h9 T* A& a$ j+ O; y7 C//color -指定背景色
, F* p/ [7 h# a- h5 S//xDest -显示位图的左上角x坐标
% A% s6 s* e8 |2 G6 v//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
! W, F" m7 X  w7 x8 j//nFlag -淡入淡出标志 1--淡入 其它--淡出
void 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];
+ A; A) D3 \1 u: I  pPALETTEENTRY pOriginal[256];
" K' j6 Y0 H2 Y& b0 H& y6 S) hCPalette pal;
// 创建236色调色板
　
8 j5 z6 c- X6 _  xBITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
　
int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
% Y2 ?' d- ]) V- V1 << bmInfo.bmiHeader.biBitCount;
4 C- F2 ]3 F- a8 n2 |: cint nWidth = bmInfo.bmiHeader.biWidth;
* R$ {0 o) L% T! m6 t; A/ S% g. j- \int nHeight = bmInfo.bmiHeader.biHeight;
5 w. x0 B( `+ w. n$ ]LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
2 D. A4 m. Z1 M1 E; G" I* yint clrRValue = GetRValue(color);
" X; B- O: D& l: c" Uint clrGValue = GetGValue(color);
int clrBValue = GetBValue(color);
) C" y" G+ C+ e* Yif( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
1 ~/ D: I/ [$ G2 y4 [7 Aif (!(hPal = Create236Palette(hDIB)))
; J! L+ p% U: Lreturn;
, u- h& j4 R7 U, Zpal.Attach( hPal );
+ X$ E2 F2 u/ Z4 _# |// 得到调色板初始值
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
: X5 |/ |+ o  Q  h2 D- V// 设定动态调色板初始值为指定色
if(nFlag==1)
for (j = 0; j < nColors; j++)
pAnimate[j].peRed = clrRValue;
! }+ M: O  o6 A7 OpAnimate[j].peGreen = clrGValue;
pAnimate[j].peBlue = clrBValue;
1 ^. w2 i/ i; j& CpAnimate[j].peFlags = PC_RESERVED;
else
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
4 B% V2 [5 j- F/ Q, W* `$ B7 `CPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
pDC->RealizePalette();
CDC memDC;
. h/ o( A* {) t; ?memDC.CreateCompatibleDC( pDC );
CBitmap bmp;
6 b4 W1 b. e) j6 |! Cbmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
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 );
// 淡入淡出
5 a( @- t* C6 wfor( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
if(nFlag==1)
$ G+ y1 L1 D% z9 h7 B6 Q; EpAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
6 k( B/ P! h: J% Z1 b& KpAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
pAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
" ]. V; e  M: [) P4 i- Helse
pAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
" y) ^% ~0 J5 d2 j) D- t6 J: n3 @pAnimate[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);
// Delay...
Sleep(nDelay);
memDC.SelectPalette(pOldMemPalette, FALSE);
memDC.SelectObject( pOldBitmap );
pDC->SelectPalette(pOldPalette, FALSE);
else if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
! g9 w. j9 W9 v+ j/ k( gfor( int i=0; i < nColors; i++)
pOriginal.peRed = bmInfo.bmiColors.rgbRed ;
7 s5 x: N! [. ]2 wpOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
pOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
& D4 b( P$ V) U7 z8 U5 i3 m+ Tif(nFlag==1)
bmInfo.bmiColors.rgbRed = clrRValue;
bmInfo.bmiColors.rgbGreen = clrGValue;
' t+ Q, R/ k7 W  abmInfo.bmiColors.rgbBlue = clrBValue;
+ u( P" Q* e+ N0 y  _::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
0 u; l7 e# z: b, I// 淡入淡出
9 g7 x* I( k( c8 f/ u$ Yfor( i=1; i <= nLoops; i++ )
# d9 f7 i' {9 m/ a- [7 y& Cfor (j = 0; j < nColors; j++)
if(nFlag==1)
$ S4 v- r6 W  q0 x) X5 ebmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
+ u- i4 Q2 K0 t/ @' F6 JbmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
bmInfo.bmiColors[j].rgbBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
8 U* S; C. Z- z' velse
bmInfo.bmiColors[j].rgbRed = pOriginal[j].peRed - ((pOriginal[j].peRed-clrRValue)*i)/nLoops;
; O' C) z5 m8 j' {bmInfo.bmiColors[j].rgbGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen-clrGValue)*i)/nLoops;
+ T1 w4 O8 |+ G+ J) \+ K4 f  kbmInfo.bmiColors[j].rgbBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue-clrBValue)*i)/nLoops;
  q- [$ h/ r. F2 B; z  B, x::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
5 x. Z, y( }0 M* S/ E// Delay...
8 W' O9 L4 s4 ?$ y# q1 h  j/ @6 cSleep(nDelay);