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
- z% r8 y1 W6 z  X$ P6 x" |! M$ e  l函数设置调色板，改变显示结果。
5 ~  R  o8 F' ~: {1 N2、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
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
0 R- `4 U% s7 k9 b$ ]" P返回：位图的淡入淡出
//参数说明：
//hDIB -位图句柄
5 H9 y( ]0 h9 ?//color -指定背景色
( [$ f) y6 B; A9 e2 `* v, I//xDest -显示位图的左上角x坐标
3 l6 v3 u, f6 z( S# i//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
void FadeInORFadeOut( CDC *pDC, HANDLE hDIB, COLORREF color, int xDest, int yDest,
int nLoops, int nDelay ,int nFlag)
int i,j;
% D8 m. `5 M! H$ R( D/ Z4 z3 v* _+ WHPALETTE hPal;
0 [$ ]7 ]* j: \) I- qPALETTEENTRY pAnimate[256];
! r& }# x  z/ g! k: ZPALETTEENTRY pOriginal[256];
CPalette pal;
8 y( `, B% y* T/ s3 N# E// 创建236色调色板
+ ?" F, ~  t& Q% s; G6 |3 W　
BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
　
int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount;
int nWidth = bmInfo.bmiHeader.biWidth;
int nHeight = bmInfo.bmiHeader.biHeight;
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
* }% g- H, q, [; D) M" Fint clrRValue = GetRValue(color);
int clrGValue = GetGValue(color);
int clrBValue = GetBValue(color);
& k2 [7 v& M; v* c4 Qif( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
if (!(hPal = Create236Palette(hDIB)))
return;
" R( H, N4 ^# r$ X0 Jpal.Attach( hPal );
( S/ D3 i. L3 P' p// 得到调色板初始值
4 E; Y0 \$ Z( _5 q: c& P2 l- ]GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
// 设定动态调色板初始值为指定色
if(nFlag==1)
1 O$ g6 y' K. S: S" S! |for (j = 0; j < nColors; j++)
pAnimate[j].peRed = clrRValue;
% p" Y+ R7 p: q6 ypAnimate[j].peGreen = clrGValue;
pAnimate[j].peBlue = clrBValue;
7 e$ [6 `  W# Q. G7 k/ LpAnimate[j].peFlags = PC_RESERVED;
else
3 U6 C9 s& x+ v" ~) cGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
CPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
pDC->RealizePalette();
$ Z4 i! M9 S1 p, H3 L; [+ fCDC memDC;
memDC.CreateCompatibleDC( pDC );
: ]. H2 V) Q. v3 @6 Y1 W: e0 eCBitmap bmp;
" K' q" k: \, u  S1 u7 nbmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
CPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
$ i1 Y# G( a$ \$ }: Z( y, [1 [# @memDC.RealizePalette();
::SetDIBitsToDevice(memDC.m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
4 _. Y9 k- P. M$ [# c+ W) N0 @* mAnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
2 L" E' J/ j; }% G# @4 n% mpDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
$ T5 F3 v, f" s( H9 I// 淡入淡出
: N8 n' p" K) O" b6 w- r; A8 L4 c- {for( i=1; i <= nLoops; i++ )
" A3 p) ~$ V  T- J# K6 c/ Z6 }for (j = 0; j < nColors; j++)
$ U& J& Z, q( b; _if(nFlag==1)
6 H' B( h- ?3 }4 B: I% FpAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
5 F$ n9 Q" k. c9 |4 S9 V3 l1 ?pAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
pAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
pAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
pAnimate[j].peGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen - clrGValue)*i)/nLoops;
pAnimate[j].peBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue - clrBValue)*i)/nLoops;
+ X8 P. n- [0 t+ X  d8 c7 ]pal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
* u4 Q( j1 g, G3 J/ z0 `! U// Delay...
: \6 t% g  W( q; W, SSleep(nDelay);
! e4 [5 M$ w; o8 LmemDC.SelectPalette(pOldMemPalette, FALSE);
& N# s: l6 |/ P3 D, r& nmemDC.SelectObject( pOldBitmap );
( J7 w9 O; \1 C) n  upDC->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 ;
, m7 {: |: f, L$ P. dpOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
$ J3 y7 p% Q3 x$ a6 xpOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
if(nFlag==1)
6 q7 R! Y, \+ abmInfo.bmiColors.rgbRed = clrRValue;
bmInfo.bmiColors.rgbGreen = clrGValue;
bmInfo.bmiColors.rgbBlue = clrBValue;
::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
7 f; V9 i% w# g// 淡入淡出
. N6 K% R" {( E5 r* rfor( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
/ R% ~8 n5 E3 ?( j0 H! l/ [if(nFlag==1)
bmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
' F9 Y6 X6 k9 r! a, z. S7 z6 V& ebmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
# }) R1 o: f5 J) rbmInfo.bmiColors[j].rgbBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
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;
; K* v$ |9 k8 [5 W. Q0 E# B# FbmInfo.bmiColors[j].rgbBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue-clrBValue)*i)/nLoops;
6 L- Y' e- [2 g% q% R/ T2 F::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
' |: d. h) F0 A5 L/ p// Delay...
0 X8 e& L7 k& |. A2 QSleep(nDelay);