指定背景的淡入淡出

天云上人

创建步骤：
3 I% ]; u$ T$ J1 x6 j1、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
* c% h* J) t6 V: N  A* I6 n函数设置调色板，改变显示结果。
% x; V% y1 t9 p( w2、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
. M6 y; \0 q2 F* R$ ]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' h. g  @0 l4 }8 n0 h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：
//hDIB -位图句柄
% p5 o$ U% d$ {2 m. R//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
1 ^/ @0 ^& q7 U( V//nDelay -每次循环中的延时
//nFlag -淡入淡出标志 1--淡入 其它--淡出
. C* R* s9 k7 F& ~4 o0 V5 n) Z! N6 {void FadeInORFadeOut( CDC *pDC, HANDLE hDIB, COLORREF color, int xDest, int yDest,
int nLoops, int nDelay ,int nFlag)
0 M* K6 T% R4 Mint i,j;
. g) U3 Z4 ^5 YHPALETTE hPal;
PALETTEENTRY pAnimate[256];
$ e+ o' Q) x3 p$ e+ G  [7 UPALETTEENTRY pOriginal[256];
CPalette pal;
/ G6 ~3 Z" _5 Q// 创建236色调色板
! v  r) O, d, i. |9 Z! [9 ^+ `% W, V　
/ [2 s& q% e) k+ p. fBITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
; h7 d% V, ~( U% M　
( b6 @. U) C" k8 J& F( b$ _int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount;
! e: W: H* Z6 c8 pint nWidth = bmInfo.bmiHeader.biWidth;
0 G( @8 W' l. \1 ^3 l1 wint nHeight = bmInfo.bmiHeader.biHeight;
8 K( C* z5 V2 G% g. L6 pLPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
' E, q7 }( P! kint clrRValue = GetRValue(color);
( [2 J  U' P$ S$ E" z1 l' G! _int clrGValue = GetGValue(color);
int clrBValue = GetBValue(color);
" q, D8 l3 t8 r1 Rif( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
if (!(hPal = Create236Palette(hDIB)))
return;
  A5 l# l. D3 p; B; F8 m4 gpal.Attach( hPal );
// 得到调色板初始值
) C  h, B% `' Z& h6 Q$ qGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
// 设定动态调色板初始值为指定色
4 m* u0 N  s+ t. uif(nFlag==1)
for (j = 0; j < nColors; j++)
% V" N7 v- W$ f! [- \. P& YpAnimate[j].peRed = clrRValue;
pAnimate[j].peGreen = clrGValue;
* V; T# ~& D! k6 X& VpAnimate[j].peBlue = clrBValue;
pAnimate[j].peFlags = PC_RESERVED;
else
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
( {1 S! e! ~7 b9 Y1 }3 V4 p- _CPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
/ J5 O) C% Q" A7 ?& L  X0 y- dpDC->RealizePalette();
CDC memDC;
/ c8 m3 Y0 `9 J) X. S5 g; r; R4 P. gmemDC.CreateCompatibleDC( pDC );
- g* v; g; M& ^) u& T# d  h' qCBitmap bmp;
bmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
- ]- I6 t# \/ OCPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
memDC.RealizePalette();
; d& ?  r( E& ~::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 );
' |: l6 ~+ \# P6 p/ p// 淡入淡出
2 l  Q' w/ D# M1 {7 l: e8 o. p$ pfor( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
4 D1 [! Q% J  mif(nFlag==1)
pAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
1 O  o- z# G, [3 d" M7 C; ~/ lpAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
, G) d" j8 c; p& OpAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
+ U& O$ H" Z* o) `# P2 {, {5 Y1 ?+ }else
$ z& [0 N4 Z5 P' A5 `; vpAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
pAnimate[j].peGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen - clrGValue)*i)/nLoops;
! s& H) S" `! U5 t) tpAnimate[j].peBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue - clrBValue)*i)/nLoops;
pal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
$ x8 g  Z$ e2 x, B2 O) V" Q// Delay...
Sleep(nDelay);
memDC.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++)
9 u2 Q) A$ o8 p0 {" r8 m; bpOriginal.peRed = bmInfo.bmiColors.rgbRed ;
pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
pOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
if(nFlag==1)
8 K3 ^% _3 O2 \$ e& I+ rbmInfo.bmiColors.rgbRed = clrRValue;
1 D  ]* K! z4 f. }2 qbmInfo.bmiColors.rgbGreen = clrGValue;
bmInfo.bmiColors.rgbBlue = clrBValue;
- O/ L  v7 a3 ?4 G. N9 n" o$ \::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
// 淡入淡出
* ^4 G+ U8 ^$ C/ _! g" v& v1 kfor( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
' X: T- g) G( T6 i4 c5 `- qif(nFlag==1)
+ }' Q4 ?5 P! o* [! \bmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
' r* D0 V$ I' T; k4 abmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
& Q: Y) ~9 a# U- d9 {# a% 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;
& ]$ Z4 L4 `5 W" u* pbmInfo.bmiColors[j].rgbGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen-clrGValue)*i)/nLoops;
) ?8 ^- c% g, n) W! ~6 NbmInfo.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);
4 u9 ?) m; n- y' f! ~// Delay...
2 S4 g5 b; ^6 y# s$ M3 U' S  |* kSleep(nDelay);