指定背景的淡入淡出

天云上人

创建步骤：
" h: k3 a; G3 S- e8 I1、如果系统支持调色板，创建动态调色板pAnimate与初始调色板pOriginal。
& M5 e" y: y4 ?( R) F, o4 v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
9 L1 |  ]( h2 i5 ], a4 O* i  _# z/ ^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
0 I. i# {; J8 y5 q6 N" @( ~; [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
; T) b: e5 ~7 l4 o1 J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
3 M' Q" h4 a4 L+ y! ~改位图调色板，显示位图改变显示结果
- I% y' @; t" G  y( @4 ?返回：位图的淡入淡出
//参数说明：
  }- r- A7 m- b6 o! {//hDIB -位图句柄
- w+ |3 V- z' t//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
' [) @0 @( U) C/ x//nLoops -循环次数
//nDelay -每次循环中的延时
+ J" {9 T1 U: ^//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,
2 R" r- S  Z4 k9 n7 N- Q2 i. sint nLoops, int nDelay ,int nFlag)
int i,j;
HPALETTE hPal;
# k. `3 f% f) x' F; x3 o0 FPALETTEENTRY pAnimate[256];
PALETTEENTRY pOriginal[256];
CPalette pal;
: P3 O: S1 l5 U// 创建236色调色板
( u% ]; x& m3 L2 g; ^/ M* R9 K: F" [　
BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
　
4 V9 B3 D7 Q: ?- k/ C. sint nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount;
7 ~2 s1 V8 z  ]3 ]! V7 j+ Cint nWidth = bmInfo.bmiHeader.biWidth;
5 D9 T% y& {: Zint nHeight = bmInfo.bmiHeader.biHeight;
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
int clrRValue = GetRValue(color);
int clrGValue = GetGValue(color);
, z$ V- R0 `! m* |int clrBValue = GetBValue(color);
if( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
if (!(hPal = Create236Palette(hDIB)))
. g0 O2 r0 |: |% ^/ ]return;
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; {/ l7 P6 u$ \) t! g, D/ T7 B+ V. cpAnimate[j].peRed = clrRValue;
pAnimate[j].peGreen = clrGValue;
pAnimate[j].peBlue = clrBValue;
pAnimate[j].peFlags = PC_RESERVED;
else
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
8 }6 V5 ^) R( w6 HCPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
  J5 ~$ m! A0 h! s8 \, Z% `pDC->RealizePalette();
CDC memDC;
memDC.CreateCompatibleDC( pDC );
6 D% e3 ~. \4 q* p  P5 L8 g+ q" nCBitmap bmp;
bmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
! ?+ i: S5 A! g5 z: @; V2 I7 eCPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
memDC.RealizePalette();
, Y- @( _" z# W::SetDIBitsToDevice(memDC.m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
AnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
pDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
// 淡入淡出
% d, S/ D8 v& n+ b% m* vfor( i=1; i <= nLoops; i++ )
0 P$ p3 E1 ~0 T, B: mfor (j = 0; j < nColors; j++)
if(nFlag==1)
, |0 _: f; ~' u# \" s% BpAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
; d  d* P7 M+ H# H# K- L; o7 ipAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
pAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
6 E& x" D, p. W* K: r* opAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
pAnimate[j].peGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen - clrGValue)*i)/nLoops;
0 g% Q& q+ W, G# N4 ]2 _pAnimate[j].peBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue - clrBValue)*i)/nLoops;
pal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
// Delay...
. r% ~. T% @7 o9 h4 R" L/ KSleep(nDelay);
memDC.SelectPalette(pOldMemPalette, FALSE);
$ A3 @4 E2 H, z" }# zmemDC.SelectObject( pOldBitmap );
$ q6 I8 }9 ^% ?( i7 q! wpDC->SelectPalette(pOldPalette, FALSE);
1 r' w* w/ m& l: V1 velse if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
6 i* n3 ^4 v; K5 w" h+ Cfor( int i=0; i < nColors; i++)
& P2 Y1 ^. B; e1 r; tpOriginal.peRed = bmInfo.bmiColors.rgbRed ;
- V( q3 G; g: K7 z( F) M3 ~pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
+ N2 x8 {! m/ h- X# w* MpOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
/ W+ D7 `, g0 a; u8 cif(nFlag==1)
6 G- U9 ]2 M' p2 b1 z; XbmInfo.bmiColors.rgbRed = clrRValue;
bmInfo.bmiColors.rgbGreen = clrGValue;
bmInfo.bmiColors.rgbBlue = clrBValue;
* ?0 Q: a( u' Y" K" \; `0 N2 L! b::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++)
if(nFlag==1)
+ j( c; b) ~$ P1 b7 [bmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
  j* p) U- P/ T! g$ u- [bmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
bmInfo.bmiColors[j].rgbBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
1 r- ^0 g8 O6 B4 J& s) delse
bmInfo.bmiColors[j].rgbRed = pOriginal[j].peRed - ((pOriginal[j].peRed-clrRValue)*i)/nLoops;
' g/ I) q! l, zbmInfo.bmiColors[j].rgbGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen-clrGValue)*i)/nLoops;
' d" Z4 E1 X9 g9 S/ h2 UbmInfo.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);
0 d) K6 B/ ~0 `; l// Delay...
Sleep(nDelay);