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。
5 S4 q/ }/ V- r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
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 G; h% [, _/ a" |6 c* X% w' 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
& @- u( G- Z: I3 z$ Q3 c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：
0 J4 P# O: C9 K0 I* E; k4 N# R, z//hDIB -位图句柄
2 T8 h) D, \# e. B% Y5 x//color -指定背景色
//xDest -显示位图的左上角x坐标
9 i: l, q3 n+ m- j//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
3 x. E2 P* g" n% S' ]; a//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;
% c! w2 B4 Z$ h7 Z2 o' {PALETTEENTRY pAnimate[256];
# T, q! N" I: B! j$ @" OPALETTEENTRY pOriginal[256];
CPalette pal;
1 C3 A8 Q* e2 A// 创建236色调色板
6 I2 W5 B; c; W7 {5 E8 ]9 @　
BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
　
int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
+ a: W  Y( q( G6 M7 ^: I% X8 v0 i' \1 << bmInfo.bmiHeader.biBitCount;
" l( ]! a) G! ?1 v( I4 w* f9 nint nWidth = bmInfo.bmiHeader.biWidth;
int nHeight = bmInfo.bmiHeader.biHeight;
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
int clrRValue = GetRValue(color);
! H  x" H+ M9 f+ C2 |# i$ Cint clrGValue = GetGValue(color);
int clrBValue = GetBValue(color);
if( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
if (!(hPal = Create236Palette(hDIB)))
return;
pal.Attach( hPal );
// 得到调色板初始值
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
6 u+ ^2 h$ B- V$ g, M& F// 设定动态调色板初始值为指定色
if(nFlag==1)
for (j = 0; j < nColors; j++)
# W0 |. I. ~" QpAnimate[j].peRed = clrRValue;
' k" c/ n* s- F; d( ^! @pAnimate[j].peGreen = clrGValue;
0 V& a8 o4 i  y0 {; ^$ @pAnimate[j].peBlue = clrBValue;
& ?. P, O* ^9 W( w, O+ TpAnimate[j].peFlags = PC_RESERVED;
else
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
CPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
5 I; _# Z" o9 ~pDC->RealizePalette();
! s) g; ]$ B  Y) `$ K: R6 }CDC memDC;
memDC.CreateCompatibleDC( pDC );
CBitmap bmp;
& `: {* x, s+ p6 Hbmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
2 |' p* v' R/ c& f5 X( a' fCPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
memDC.RealizePalette();
6 z: \( a  b( J: f; a::SetDIBitsToDevice(memDC.m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
3 ?2 t8 K& W/ |& Q3 Y9 |) _AnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
pDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
5 g# H6 M! Q0 b+ E7 Y// 淡入淡出
8 \, _! C" D* ]! F# S" K4 r* ]( jfor( i=1; i <= nLoops; i++ )
for (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;
pAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
" m. C* ?3 z7 [: g* M+ }) e! Relse
% ]4 V5 M: S( ?& O" tpAnimate[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;
! H1 l! g1 O' s5 r' jpal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
// Delay...
/ w& O: g; @: DSleep(nDelay);
. H% m) u' {2 ?1 h  amemDC.SelectPalette(pOldMemPalette, FALSE);
) H) D1 i6 k- K" `/ ~* y  JmemDC.SelectObject( pOldBitmap );
pDC->SelectPalette(pOldPalette, FALSE);
else if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
for( int i=0; i < nColors; i++)
( u1 ?! D/ K0 b" G- K+ g2 JpOriginal.peRed = bmInfo.bmiColors.rgbRed ;
pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
pOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
' u' U7 Y, J9 Jif(nFlag==1)
bmInfo.bmiColors.rgbRed = clrRValue;
" H3 }, Z6 d' _# P7 D  obmInfo.bmiColors.rgbGreen = clrGValue;
- _  ]9 N# A' L: m# s* ?1 D4 LbmInfo.bmiColors.rgbBlue = clrBValue;
::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++ )
+ w; O) j0 h! p% r6 M% o- m8 @7 |  Rfor (j = 0; j < nColors; j++)
, z" h$ V, n9 z# o9 Pif(nFlag==1)
bmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
, h" ~% T6 t4 N; [! D  y1 j% T* ?2 LbmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
& v: x  q& l9 D- Q) ]- [. K# x7 YbmInfo.bmiColors[j].rgbBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
) P, _$ D% j' a, C7 @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;
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...
4 o  E: M- u" P1 {; p+ ^Sleep(nDelay);