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。
7 V5 _7 c6 {- y, H$ S. o4 }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
4 I6 w/ X, s+ o) z' B/ `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 G; x' }, I* R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
8 u7 _' N. O) E$ N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
# U9 p+ `% m/ F1 q: t- |3 Z//参数说明：
1 L7 k- }3 U. A//hDIB -位图句柄
' u6 H8 r+ R' S+ x//color -指定背景色
* B, ^3 W1 N! n4 h) J7 I: L4 t+ U1 I! q//xDest -显示位图的左上角x坐标
2 Z% y+ O9 z* ?. C//yDest -显示位图的左上角y坐标
//nLoops -循环次数
% b+ h0 S& t  Z; r; V//nDelay -每次循环中的延时
//nFlag -淡入淡出标志 1--淡入 其它--淡出
' o2 Q7 a% k+ c% S( ~0 [void FadeInORFadeOut( CDC *pDC, HANDLE hDIB, COLORREF color, int xDest, int yDest,
. n& h  I& x) P' C0 V. H, f8 h1 P! B, sint nLoops, int nDelay ,int nFlag)
- ?% N* a  y. B9 Pint i,j;
& h8 W' [5 F; B3 x$ MHPALETTE hPal;
' i) z1 I+ ~: Q: d3 G/ oPALETTEENTRY pAnimate[256];
PALETTEENTRY pOriginal[256];
( B& }7 I1 u$ b' {4 @CPalette pal;
// 创建236色调色板
　
BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
, R" O; |* R) T% m1 x　
5 i" w0 ]) D! mint nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
- [" F9 D/ B$ P: s1 << bmInfo.bmiHeader.biBitCount;
& B; P3 M: U' F% {. q3 e$ oint nWidth = bmInfo.bmiHeader.biWidth;
4 T, z2 k4 t: K% |6 p9 Wint nHeight = bmInfo.bmiHeader.biHeight;
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
int clrRValue = GetRValue(color);
int clrGValue = GetGValue(color);
7 {5 }9 L; F3 @0 P# b5 s3 Fint clrBValue = GetBValue(color);
& [5 E% {5 r7 ?& P, ^) cif( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
if (!(hPal = Create236Palette(hDIB)))
1 A3 L0 Y- G, H. @4 Dreturn;
) W% X; [4 _$ s0 x( rpal.Attach( hPal );
, y4 s. g5 z' R- w9 E% ]// 得到调色板初始值
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
4 v* W9 C0 `# H. l// 设定动态调色板初始值为指定色
if(nFlag==1)
for (j = 0; j < nColors; j++)
" m, r1 F3 f5 d# F2 I$ d; OpAnimate[j].peRed = clrRValue;
pAnimate[j].peGreen = clrGValue;
pAnimate[j].peBlue = clrBValue;
. o; Q6 p$ `( ApAnimate[j].peFlags = PC_RESERVED;
else
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
CPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
6 }6 }8 _/ e/ K" R6 OpDC->RealizePalette();
8 D& o+ l: O( U: o" }" M8 RCDC memDC;
memDC.CreateCompatibleDC( pDC );
! d" X- i! Z1 ^4 C2 B& P1 r7 O, LCBitmap bmp;
  d% k* @% z; ~bmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
9 u4 Q& _0 j7 ^5 a/ q  dCPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
# u6 N% }8 k; M& V& m, VmemDC.RealizePalette();
& ]: |9 d+ d+ Q::SetDIBitsToDevice(memDC.m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
9 X+ F9 {) T, @0 {  n" ?+ A; v  Y! I2 b) SAnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
pDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
1 d9 Z4 A- O8 k4 c// 淡入淡出
- ]+ M4 O" _, W% b) {! B5 t& [for( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
+ h5 p" e1 z5 g( A) S1 O4 }if(nFlag==1)
pAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
pAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
- O! I$ i1 J5 ?pAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
9 t8 f2 V1 D  W% zpAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
pAnimate[j].peGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen - clrGValue)*i)/nLoops;
+ k0 h) K* K+ ~; B6 CpAnimate[j].peBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue - clrBValue)*i)/nLoops;
8 Z' C4 I) W' ^/ J9 Ipal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
/ M: B. e$ w1 X" W: g// Delay...
Sleep(nDelay);
, B& x; m% e+ }7 lmemDC.SelectPalette(pOldMemPalette, FALSE);
memDC.SelectObject( pOldBitmap );
1 N5 B; X4 F) _6 `! v4 o$ Y# npDC->SelectPalette(pOldPalette, FALSE);
else if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
# L0 c! W& n5 @2 D; vfor( int i=0; i < nColors; i++)
0 G. t4 B  P% ~1 ZpOriginal.peRed = bmInfo.bmiColors.rgbRed ;
pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
pOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
if(nFlag==1)
  p, }: l1 R& v/ O  mbmInfo.bmiColors.rgbRed = clrRValue;
bmInfo.bmiColors.rgbGreen = clrGValue;
bmInfo.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
0 `3 P1 O' ^4 s: k1 a. K7 {for( i=1; i <= nLoops; i++ )
8 C; O* V" P' Qfor (j = 0; j < nColors; j++)
if(nFlag==1)
! N& H6 W  A( |) G  v; rbmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
bmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
* ]$ ?' Y8 |/ n. L1 n+ AbmInfo.bmiColors[j].rgbBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
: ?, Y9 j' V1 u5 I! Oelse
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;
& U, f) l* v4 [, R3 ], KbmInfo.bmiColors[j].rgbBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue-clrBValue)*i)/nLoops;
6 r& N+ `3 h/ o) G::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
8 u4 p  p- m/ t) N& I) }* g// Delay...
Sleep(nDelay);