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
" V+ P; b; d+ B% [8 S% P: Q4 U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。
& {* [: X" S2 d2、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
: G) g$ S2 A5 K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：
5 d4 f$ D. w: x: r- T5 q//hDIB -位图句柄
) e& w+ |) f, d//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
% c* d7 `: I+ ?4 ?" \+ b, a//nLoops -循环次数
$ M" F2 j& Y6 x. ?//nDelay -每次循环中的延时
//nFlag -淡入淡出标志 1--淡入 其它--淡出
3 Z) f& s( r7 ?  Kvoid FadeInORFadeOut( CDC *pDC, HANDLE hDIB, COLORREF color, int xDest, int yDest,
int nLoops, int nDelay ,int nFlag)
/ k8 `8 n5 l1 y4 V8 yint i,j;
( _9 |$ X- ~; K% m# P& jHPALETTE hPal;
PALETTEENTRY pAnimate[256];
1 j$ }1 _6 y5 B0 P" F1 w, nPALETTEENTRY pOriginal[256];
1 p2 Z" _& d- x% n& NCPalette pal;
// 创建236色调色板
/ K. E  s3 S1 [$ L6 B- `　
BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
　
% T1 I0 ]- |9 `  ]int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount;
int nWidth = bmInfo.bmiHeader.biWidth;
int nHeight = bmInfo.bmiHeader.biHeight;
5 T# m* L' _* F& k5 `4 zLPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
int clrRValue = GetRValue(color);
int clrGValue = GetGValue(color);
int clrBValue = GetBValue(color);
- |( `' [8 S/ Uif( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
if (!(hPal = Create236Palette(hDIB)))
return;
# p% c0 ^4 _7 w1 lpal.Attach( hPal );
// 得到调色板初始值
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
! P  Y6 `+ l( R  _5 H- V# ]// 设定动态调色板初始值为指定色
if(nFlag==1)
7 z8 `7 o( Y  z) ]5 Y3 `: wfor (j = 0; j < nColors; j++)
pAnimate[j].peRed = clrRValue;
4 u5 _. q  e' z( lpAnimate[j].peGreen = clrGValue;
* ~. Q- K1 y% D% b/ L7 dpAnimate[j].peBlue = clrBValue;
pAnimate[j].peFlags = PC_RESERVED;
else
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
CPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
7 U2 J" g8 _$ Y- w8 `pDC->RealizePalette();
CDC memDC;
6 d: X" m% x4 f$ ^memDC.CreateCompatibleDC( pDC );
# T6 N+ d; P0 \0 ?CBitmap bmp;
/ s5 ^7 L* j! i0 kbmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
9 u+ }/ Y: v3 W& F1 gCBitmap *pOldBitmap = memDC.SelectObject( &bmp );
! ?% S1 f- O) ]CPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
memDC.RealizePalette();
' r% {7 i! v) J1 w( D( A$ J::SetDIBitsToDevice(memDC.m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
& V0 @: t6 v7 m# e! j/ xAnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
; E5 d: F4 y: T2 Z0 @/ rpDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
/ C" U! e5 ~! z6 F; l// 淡入淡出
for( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
% E' y) g$ n2 F* R) j) Y1 ?if(nFlag==1)
9 \: `; L- t4 }- UpAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
9 q3 i+ s/ l5 ]" FpAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
) W2 G( G- E4 F. |6 C- fpAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
- @3 ~' q) E0 W0 VpAnimate[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;
' O6 y& O( ~. T4 lpal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
// Delay...
Sleep(nDelay);
; @2 H$ O  h* Y2 y* DmemDC.SelectPalette(pOldMemPalette, FALSE);
& z8 J; d8 Y  ^8 _1 K$ mmemDC.SelectObject( pOldBitmap );
pDC->SelectPalette(pOldPalette, FALSE);
else if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
for( int i=0; i < nColors; i++)
5 j5 M& `+ y7 A0 L7 l2 F3 Q! ], m. wpOriginal.peRed = bmInfo.bmiColors.rgbRed ;
pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
8 r9 L, ^& K; S. D3 opOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
if(nFlag==1)
% Q+ l2 W' B" C+ cbmInfo.bmiColors.rgbRed = clrRValue;
bmInfo.bmiColors.rgbGreen = clrGValue;
bmInfo.bmiColors.rgbBlue = clrBValue;
6 Q$ g9 y) m( z5 O% K::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
, R) x& A+ Q) f: o$ G" ^6 Y6 u( ?// 淡入淡出
3 s( b9 A% G7 kfor( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
7 @; Z& v2 h( @4 l) ?if(nFlag==1)
; C7 X8 h6 A9 |9 g% A* sbmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
  S) f0 `0 B$ n( E3 n! j+ QbmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
+ ]; C2 A8 J7 }# u- ^bmInfo.bmiColors[j].rgbBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
/ \0 j' ~" Z3 V  a, Ielse
; ~! |' l, D1 D1 E5 @. T( nbmInfo.bmiColors[j].rgbRed = pOriginal[j].peRed - ((pOriginal[j].peRed-clrRValue)*i)/nLoops;
% D+ _/ w: y! g3 D0 wbmInfo.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...
" b1 B/ {0 y3 rSleep(nDelay);