指定背景的淡入淡出

天云上人

创建步骤：
1 E6 L" ?  C1 |) P1、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
) T5 O5 @+ O. H* U函数设置调色板，改变显示结果。
/ g& W% B4 j3 O8 k, m+ p2、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
/ [: r: d9 p" t* V+ O8 v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
! \- M$ w4 Y/ `% [: W3 f" `7 _//参数说明：
//hDIB -位图句柄
0 i1 K8 v0 R  b. `//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
/ Z& i5 D0 E$ e//nDelay -每次循环中的延时
! `5 ]% A5 I- E! s- N//nFlag -淡入淡出标志 1--淡入 其它--淡出
* J4 Z& ^' @0 Z+ [' Pvoid FadeInORFadeOut( CDC *pDC, HANDLE hDIB, COLORREF color, int xDest, int yDest,
int nLoops, int nDelay ,int nFlag)
* W. F2 T) u% ~$ \: P- Pint i,j;
( U$ @! T" r; y& f3 T' S6 eHPALETTE hPal;
PALETTEENTRY pAnimate[256];
PALETTEENTRY pOriginal[256];
' R8 Y. j6 `9 kCPalette pal;
// 创建236色调色板
　
BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
　
7 f" G9 U, I5 }) ?9 Oint nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount;
int nWidth = bmInfo.bmiHeader.biWidth;
int nHeight = bmInfo.bmiHeader.biHeight;
- I, X' I% I0 E: k. mLPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
% e' N" r) y- L$ C& J9 H' ~. tint clrRValue = GetRValue(color);
5 k, i5 c* i+ b% yint clrGValue = GetGValue(color);
int clrBValue = GetBValue(color);
if( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
; b& `; n2 n* ^  f0 S/ ]: T7 s( yif (!(hPal = Create236Palette(hDIB)))
return;
/ k0 u6 L2 w( N$ r2 I0 ]pal.Attach( hPal );
// 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
if(nFlag==1)
for (j = 0; j < nColors; j++)
! d* V' y  S0 l! `; x) YpAnimate[j].peRed = clrRValue;
" n3 Y1 I0 i0 XpAnimate[j].peGreen = clrGValue;
pAnimate[j].peBlue = clrBValue;
! Z# S$ Y0 X; N" qpAnimate[j].peFlags = PC_RESERVED;
else
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
CPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
/ y' b1 o' \  v, q/ JpDC->RealizePalette();
CDC memDC;
0 {. N" V. a( fmemDC.CreateCompatibleDC( pDC );
/ ^3 j/ `" Y9 |5 K& vCBitmap bmp;
bmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
2 n+ a- D  N+ e. H- c; E& jCPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
memDC.RealizePalette();
+ |4 c) N% R$ |0 C" [::SetDIBitsToDevice(memDC.m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
3 O( h8 J  n* |6 v. i  LAnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
% [6 M4 D; S& B7 i0 HpDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
- {. h. n0 O1 t) ^; h// 淡入淡出
7 n- k+ t8 N) ]# nfor( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
if(nFlag==1)
pAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
. v0 m7 e) |# v3 epAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
+ z# C5 d4 b6 W; v1 ]; F( epAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
  \7 F+ W; e$ y( y: B2 Felse
pAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
8 z) a8 f& S. Y6 IpAnimate[j].peGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen - clrGValue)*i)/nLoops;
pAnimate[j].peBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue - clrBValue)*i)/nLoops;
pal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
  K8 w) u$ c0 M& ?- k, M// Delay...
1 f3 T7 _  o2 F, W' u: ]" oSleep(nDelay);
; J2 I- w6 ?: t: l, e4 Y9 bmemDC.SelectPalette(pOldMemPalette, FALSE);
memDC.SelectObject( pOldBitmap );
0 k  j+ U/ O  r) O  ^pDC->SelectPalette(pOldPalette, FALSE);
else if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
# @+ J: O+ ?$ G1 X; \2 s8 D0 N6 jfor( int i=0; i < nColors; i++)
5 C6 K& m; l1 M) D8 _0 X9 ~pOriginal.peRed = bmInfo.bmiColors.rgbRed ;
pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
& _% x' _0 `, |6 ?/ c8 o$ upOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
if(nFlag==1)
bmInfo.bmiColors.rgbRed = clrRValue;
bmInfo.bmiColors.rgbGreen = clrGValue;
bmInfo.bmiColors.rgbBlue = clrBValue;
8 _2 p4 N( c" o7 w3 r3 g::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
// 淡入淡出
for( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
7 @4 l* k9 P% o. u2 mif(nFlag==1)
bmInfo.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;
/ r9 K5 F  s  DbmInfo.bmiColors[j].rgbGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen-clrGValue)*i)/nLoops;
5 j% R; A; N: Q; h9 XbmInfo.bmiColors[j].rgbBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue-clrBValue)*i)/nLoops;
3 d: a; P9 j# n5 l::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
3 h+ a( O# R+ f0 o) O' s// Delay...
8 d1 z' Q5 l5 ISleep(nDelay);