指定背景的淡入淡出

天云上人

创建步骤：
* `! v& O, ~# Q7 I! T' X1、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
5 }0 C: I& O9 o3 N+ p7 x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
' }+ p: F# J, J) ~) U" Z- e# m; [* t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
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 ]% |# b: e8 u9 G& K) Y. W返回：位图的淡入淡出
//参数说明：
" z8 @9 b) E& Z  S& C3 `* B//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
0 [) G& x6 M( f7 \//nLoops -循环次数
' W8 d7 o4 s1 ]8 ^" H//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;
HPALETTE hPal;
* j8 j" b" R0 r# b0 O& pPALETTEENTRY pAnimate[256];
  Q8 `+ c1 ~0 r! T# @+ NPALETTEENTRY pOriginal[256];
CPalette pal;
// 创建236色调色板
　
BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
2 I9 Z: q& U9 C. i" a2 t* l) h　
int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
) F+ Q4 Q0 f# A: q1 << bmInfo.bmiHeader.biBitCount;
int nWidth = bmInfo.bmiHeader.biWidth;
int nHeight = bmInfo.bmiHeader.biHeight;
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
int clrRValue = GetRValue(color);
! c$ R/ D2 x6 n- A( v$ D3 q: {int clrGValue = GetGValue(color);
% g- y% g6 l9 W4 [2 C" H% \int clrBValue = GetBValue(color);
if( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
if (!(hPal = Create236Palette(hDIB)))
  s* |; x2 [8 f4 G" X( T' d0 lreturn;
pal.Attach( hPal );
// 得到调色板初始值
  I6 x5 o; |0 c8 M" S+ U! XGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
- V9 w' ~, j9 h7 J2 E! y1 T// 设定动态调色板初始值为指定色
- a% l5 i5 `5 a* ]* `8 `+ I+ B* P5 nif(nFlag==1)
for (j = 0; j < nColors; j++)
% e/ w+ _3 n0 W* @; H8 npAnimate[j].peRed = clrRValue;
pAnimate[j].peGreen = clrGValue;
pAnimate[j].peBlue = clrBValue;
1 n9 C; _, j2 npAnimate[j].peFlags = PC_RESERVED;
; D8 v0 q/ G+ }4 ^2 b: l* v- Yelse
8 e8 m. O: ]2 l" ^# `GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
2 K, Z9 h# ^4 X/ `( NCPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
pDC->RealizePalette();
CDC memDC;
memDC.CreateCompatibleDC( pDC );
CBitmap bmp;
bmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
- m. a4 i1 Q5 k0 ^CPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
7 R- I! @! ?7 Q" |) D, x) _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);
# U! F; d1 M% l5 o& wpDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
5 }  R9 S/ ^5 I) O; ^9 z% f) o// 淡入淡出
for( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
( t) X+ s0 ]7 f$ j: K2 ^" R$ x: Lif(nFlag==1)
# I* r, h% }' |2 V( Z6 o" qpAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
pAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
5 u* X7 \" V$ M# |0 [pAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
pAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
1 U( @* }3 X+ J: _% lpAnimate[j].peGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen - clrGValue)*i)/nLoops;
pAnimate[j].peBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue - clrBValue)*i)/nLoops;
* u1 z) k5 |' u# G8 R, v) Hpal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
// Delay...
Sleep(nDelay);
: ^, u# A0 c5 ?7 `/ dmemDC.SelectPalette(pOldMemPalette, FALSE);
" g/ e1 u# L! LmemDC.SelectObject( pOldBitmap );
pDC->SelectPalette(pOldPalette, FALSE);
6 @+ ~; H  s! e" v! uelse if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
for( int i=0; i < nColors; i++)
pOriginal.peRed = bmInfo.bmiColors.rgbRed ;
2 n6 D2 e" K  ~pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
0 Y5 x8 V5 V; T3 w! b& rpOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
if(nFlag==1)
bmInfo.bmiColors.rgbRed = clrRValue;
0 W" @  G! A# lbmInfo.bmiColors.rgbGreen = clrGValue;
, }4 _, k  Y: u. H' G3 v$ F5 {- jbmInfo.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++ )
for (j = 0; j < nColors; j++)
" ?2 B, A/ j; g0 P: Dif(nFlag==1)
bmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
$ p: g+ N8 d) x* zbmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
bmInfo.bmiColors[j].rgbBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
8 A* f0 i& a; U. Zelse
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...
Sleep(nDelay);