指定背景的淡入淡出

天云上人

创建步骤：
1 X4 ?5 ]2 b( u5 f% K& U% 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
7 h3 k$ Q  M. H% @; x: f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
, W; U" e+ z: g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
1 K% O8 q) ^. {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
//color -指定背景色
/ D/ b" o8 G# l2 O  a0 ?% w//xDest -显示位图的左上角x坐标
//yDest -显示位图的左上角y坐标
/ ?7 d) E# e/ h; R6 |//nLoops -循环次数
//nDelay -每次循环中的延时
1 F/ I0 p+ R( l& s3 Z) ^! `, V//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)
2 D1 N+ |0 l8 G1 ~- R) V# cint i,j;
HPALETTE hPal;
$ r: s% C: W7 s" [5 e0 p$ DPALETTEENTRY pAnimate[256];
PALETTEENTRY pOriginal[256];
! p/ r1 F9 A& S1 q; F. J. H& WCPalette pal;
) }4 |  d" }+ X( V& L$ w& @// 创建236色调色板
; R, g9 S) V& a3 u# f; f7 I) M　
0 ?! L& T) S. T8 b* |( vBITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
, {  h% }$ a9 |5 s( X1 W) F　
. a2 _1 e1 @* H; e# }" oint nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount;
& Z; R( ^" U% `* C1 O' C8 }int nWidth = bmInfo.bmiHeader.biWidth;
int nHeight = bmInfo.bmiHeader.biHeight;
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
int clrRValue = GetRValue(color);
int clrGValue = GetGValue(color);
* @0 }: x6 r" F$ {. Gint clrBValue = GetBValue(color);
/ b! t+ H! y4 q2 x4 o) L* ^+ k2 m4 Lif( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
if (!(hPal = Create236Palette(hDIB)))
7 S) V9 R) I& N5 s0 m. \6 V: lreturn;
- Y! G3 C1 y7 ]  M4 O0 j/ Jpal.Attach( hPal );
// 得到调色板初始值
* H. J, @: `1 H4 t- B) \: AGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
// 设定动态调色板初始值为指定色
if(nFlag==1)
for (j = 0; j < nColors; j++)
; C& T; w, o; Q/ xpAnimate[j].peRed = clrRValue;
pAnimate[j].peGreen = clrGValue;
: z: K) Q8 k- |+ S( q0 SpAnimate[j].peBlue = clrBValue;
, [  d; \4 [* p0 H/ `, A- E8 {pAnimate[j].peFlags = PC_RESERVED;
else
+ T2 b  _$ d# f9 b0 M% BGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
4 c9 A$ b. H7 Z8 pCPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
pDC->RealizePalette();
. M% E/ P$ e4 eCDC memDC;
memDC.CreateCompatibleDC( pDC );
CBitmap bmp;
3 V+ c, w- \2 l, H" p) zbmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
. `( q8 r9 B/ X$ ?. KCPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
# |6 n2 M1 p0 QmemDC.RealizePalette();
::SetDIBitsToDevice(memDC.m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
. g: L/ p6 l* A9 L' `AnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
pDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
// 淡入淡出
+ p9 R- z) y. U1 S2 g1 Vfor( i=1; i <= nLoops; i++ )
2 R( e) R4 y: N' H4 f. i( cfor (j = 0; j < nColors; j++)
if(nFlag==1)
1 u; o/ F( b( ^- ?4 E0 Z" VpAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
# g7 F& ]6 x* I/ o+ b# ^+ zpAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
' q6 h0 N/ s8 X8 m3 L. [2 b' opAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
5 H. f6 G. W5 X: BpAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
& O, B0 I/ X" z2 R% `9 K: d9 y9 VpAnimate[j].peGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen - clrGValue)*i)/nLoops;
" H; m+ x- @9 ?0 YpAnimate[j].peBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue - clrBValue)*i)/nLoops;
pal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
// Delay...
: H- M' E1 m; lSleep(nDelay);
4 H; D/ ?, _7 v. lmemDC.SelectPalette(pOldMemPalette, FALSE);
memDC.SelectObject( pOldBitmap );
# x: H; I/ T& }7 n9 e' j9 hpDC->SelectPalette(pOldPalette, FALSE);
# |" L; B: m# L0 c, h/ r$ }else if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
4 S  Q0 a' k3 p9 K+ b5 ?4 D. dfor( int i=0; i < nColors; i++)
pOriginal.peRed = bmInfo.bmiColors.rgbRed ;
pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
pOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
: l4 _+ u' G9 r4 t% Rif(nFlag==1)
bmInfo.bmiColors.rgbRed = clrRValue;
bmInfo.bmiColors.rgbGreen = clrGValue;
: p( I5 u# h- `  A  ^9 ZbmInfo.bmiColors.rgbBlue = clrBValue;
; ?. W+ }0 ?7 [::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
" z  U! R( Z+ ]: [% h- Y' K- W3 `// 淡入淡出
# `9 Y( C" Q# V- W5 pfor( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
if(nFlag==1)
2 r! ~0 y9 o8 ^7 cbmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
bmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
" n, Y; z: e3 \6 ~* M& ?& h$ PbmInfo.bmiColors[j].rgbBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
0 i) L  v5 J* e' W$ G& t9 felse
bmInfo.bmiColors[j].rgbRed = pOriginal[j].peRed - ((pOriginal[j].peRed-clrRValue)*i)/nLoops;
: c& V: x2 C, C, dbmInfo.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);