指定背景的淡入淡出

天云上人

创建步骤：
+ A& l5 T+ L6 L% ^! }- a1 L1、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
! }) _! A: ^! D4 y# k$ H2 |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
9 t9 y+ L/ J$ f6 }函数设置调色板，改变显示结果。
* d  }7 Y, p1 I, @: o  l2、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
返回：位图的淡入淡出
//参数说明：
//hDIB -位图句柄
//color -指定背景色
4 ?, C- j% X8 G. b! D//xDest -显示位图的左上角x坐标
2 o  @( M. V& ^) l4 b1 R# L$ R/ U/ \//yDest -显示位图的左上角y坐标
//nLoops -循环次数
. h3 f% x% G& v5 v& U//nDelay -每次循环中的延时
+ ]9 S6 x) j& Z% s" ~//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,
6 U, g, V0 }5 p& hint nLoops, int nDelay ,int nFlag)
int i,j;
HPALETTE hPal;
$ _/ y/ r: x8 \5 H1 HPALETTEENTRY pAnimate[256];
PALETTEENTRY pOriginal[256];
CPalette pal;
// 创建236色调色板
& F+ a6 E1 _0 m. _( G" x7 M$ M　
; x: M; [. `! B0 ^0 R  o6 CBITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
　
. P& y" I6 d  Z7 f7 g' _int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount;
8 O1 w" h, Z3 L" C- u% ?int nWidth = bmInfo.bmiHeader.biWidth;
) r, A0 l. M: G3 K8 kint nHeight = bmInfo.bmiHeader.biHeight;
2 p. K9 a0 c/ @0 Y# xLPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
int clrRValue = GetRValue(color);
2 C! Q9 _# K) a' R6 I8 Kint clrGValue = GetGValue(color);
int clrBValue = GetBValue(color);
if( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
1 Z% X; n4 L* X$ iif (!(hPal = Create236Palette(hDIB)))
6 E5 M  ^; j% breturn;
pal.Attach( hPal );
- J1 G0 p9 @5 \& L% B// 得到调色板初始值
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
// 设定动态调色板初始值为指定色
8 m/ U) {5 \" M! R" O7 j' T3 }$ kif(nFlag==1)
& Q& s) |% K6 T# [: v/ P9 L7 M* Efor (j = 0; j < nColors; j++)
pAnimate[j].peRed = clrRValue;
9 K7 B! P- r' U  B0 xpAnimate[j].peGreen = clrGValue;
pAnimate[j].peBlue = clrBValue;
pAnimate[j].peFlags = PC_RESERVED;
$ N  n5 r4 T1 H0 Nelse
: ?6 P3 E! q" Q' oGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
  m9 r- X/ |! |8 yCPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
pDC->RealizePalette();
" @; ^: V; h0 ^; E" I# p" }CDC memDC;
memDC.CreateCompatibleDC( pDC );
7 n/ w9 \8 A* f' Y2 _0 b$ gCBitmap bmp;
bmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
1 N$ Q$ ]0 s3 d& x* }) f' L! cCBitmap *pOldBitmap = memDC.SelectObject( &bmp );
/ d/ u) V7 _3 Z& ^9 K9 l2 zCPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
memDC.RealizePalette();
::SetDIBitsToDevice(memDC.m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
/ W3 M6 @: O$ U7 c1 pAnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
5 Y3 l6 T  d: u: o9 g& f2 ApDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
// 淡入淡出
# {/ _9 l# P# ^; mfor( i=1; i <= nLoops; i++ )
% M8 G( ^3 B: v6 i$ jfor (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;
4 x6 o. H: @; E* S, C: lpAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
* r7 C. e. n6 q' `pAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
pAnimate[j].peGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen - clrGValue)*i)/nLoops;
9 ?. @$ t( A5 \: w* k& ipAnimate[j].peBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue - clrBValue)*i)/nLoops;
pal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
// Delay...
: v! @! c6 n3 ?( i1 }  R& I# ?) I/ HSleep(nDelay);
memDC.SelectPalette(pOldMemPalette, FALSE);
memDC.SelectObject( pOldBitmap );
5 i) ^8 z3 N+ V" W4 X- h2 YpDC->SelectPalette(pOldPalette, FALSE);
* ]1 u; B* G" }" K7 A& ~" d& nelse if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
for( int i=0; i < nColors; i++)
$ ~0 t. B% G' `8 ]pOriginal.peRed = bmInfo.bmiColors.rgbRed ;
pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
pOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
* D* E, c5 R( qif(nFlag==1)
0 T/ ^6 v% z' P9 MbmInfo.bmiColors.rgbRed = clrRValue;
bmInfo.bmiColors.rgbGreen = clrGValue;
& b# ?0 o4 J+ z; R3 o6 x; hbmInfo.bmiColors.rgbBlue = clrBValue;
+ E" u/ \: c7 }: f3 S::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
& {  ]& U! ?! f4 n% R// 淡入淡出
, {1 ]7 A( f: e( ?( o: Sfor( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
if(nFlag==1)
. h# ?- X+ [* w; p; J* hbmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
bmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
bmInfo.bmiColors[j].rgbBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
bmInfo.bmiColors[j].rgbRed = pOriginal[j].peRed - ((pOriginal[j].peRed-clrRValue)*i)/nLoops;
. \1 y* W, i0 Q4 b$ sbmInfo.bmiColors[j].rgbGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen-clrGValue)*i)/nLoops;
# c, `5 D  D8 e; S1 f' |0 fbmInfo.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);
3 H8 o9 w: [; `( [3 l' I// Delay...
Sleep(nDelay);