指定背景的淡入淡出

天云上人

创建步骤：
9 }/ a8 t/ L- P2 N/ q9 q" z1、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
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
/ k4 e9 G6 D3 O. b( J9 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
1 n% Z! S$ f' ?6 d* s+ m; J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：
- P' ~+ d2 F) h6 [//hDIB -位图句柄
# [5 j0 y  S4 W6 }9 S//color -指定背景色
//xDest -显示位图的左上角x坐标
% V7 T; Q; U* M& O/ L6 F//yDest -显示位图的左上角y坐标
! F0 O& X5 W- I" H% }: I//nLoops -循环次数
# f2 L) Z# u' B, C//nDelay -每次循环中的延时
//nFlag -淡入淡出标志 1--淡入 其它--淡出
& {2 ^, O1 `- @/ e, Svoid FadeInORFadeOut( CDC *pDC, HANDLE hDIB, COLORREF color, int xDest, int yDest,
int nLoops, int nDelay ,int nFlag)
int i,j;
3 t: I$ h0 ]1 gHPALETTE hPal;
PALETTEENTRY pAnimate[256];
PALETTEENTRY pOriginal[256];
CPalette pal;
// 创建236色调色板
　
BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
　
int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
- @1 r) z# l$ H1 << bmInfo.bmiHeader.biBitCount;
int nWidth = bmInfo.bmiHeader.biWidth;
; A) z6 x) g9 W+ A; wint nHeight = bmInfo.bmiHeader.biHeight;
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
2 V5 b, J' V  mint clrRValue = GetRValue(color);
& V+ ^& _8 C: o) [int clrGValue = GetGValue(color);
7 S; b; a# M; a! r6 Pint clrBValue = GetBValue(color);
, a+ T' Z- a: Uif( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
if (!(hPal = Create236Palette(hDIB)))
2 J/ n7 R* p# X/ v2 G" J% _6 _) Nreturn;
% `2 I* M/ L: Ipal.Attach( hPal );
// 得到调色板初始值
' a5 F8 Q/ r! p3 q  kGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
; |9 Q( g' }) _  O& u// 设定动态调色板初始值为指定色
) x" p1 H" n/ aif(nFlag==1)
for (j = 0; j < nColors; j++)
pAnimate[j].peRed = clrRValue;
pAnimate[j].peGreen = clrGValue;
) u; C" v( v5 T4 M* L+ YpAnimate[j].peBlue = clrBValue;
7 R8 d6 O. H* B6 x% V  jpAnimate[j].peFlags = PC_RESERVED;
else
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
CPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
8 d5 v, t! F- ~# t/ @0 I% i: rpDC->RealizePalette();
CDC memDC;
memDC.CreateCompatibleDC( pDC );
CBitmap bmp;
0 V; \, D. z- K7 r2 d# Pbmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
2 h) u' Z2 E5 P+ ?% H' {; ^CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
CPalette *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);
, Q9 @9 d# X3 }8 GAnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
) w( m1 v+ `0 W6 H! q+ CpDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
, L% P! f" ^! k- N3 R0 V5 v// 淡入淡出
for( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
if(nFlag==1)
7 M' A8 E) O# c7 |% ^( u8 e! epAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
pAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
pAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
, ?4 B6 A6 i( f7 K1 npAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
pAnimate[j].peGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen - clrGValue)*i)/nLoops;
9 i6 p2 [3 u- T' z- B' `pAnimate[j].peBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue - clrBValue)*i)/nLoops;
6 `6 e2 z1 O- Y+ _) Qpal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
// Delay...
$ l* p& H2 O( e" o9 CSleep(nDelay);
  J+ t. Q0 y! }* c5 N* z, f% umemDC.SelectPalette(pOldMemPalette, FALSE);
! \, [/ L1 i6 o. }memDC.SelectObject( pOldBitmap );
pDC->SelectPalette(pOldPalette, FALSE);
else if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
( j; t, Y. ?( C; y& k; Tfor( int i=0; i < nColors; i++)
* {" U0 y# ^2 h- G& b8 W+ x$ GpOriginal.peRed = bmInfo.bmiColors.rgbRed ;
4 ]" A. [3 z6 @& Y( i0 _pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
* H3 e- ~# [1 S% R. Z+ @pOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
; \+ ]7 n6 v  m% [% d5 mif(nFlag==1)
bmInfo.bmiColors.rgbRed = clrRValue;
bmInfo.bmiColors.rgbGreen = clrGValue;
4 g  ]3 _6 h  c0 DbmInfo.bmiColors.rgbBlue = clrBValue;
# A! W5 `0 P( s4 c" r3 K; V' e/ a2 _" x; N::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
// 淡入淡出
5 D' V0 M0 n9 S$ X2 {& f) pfor( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
if(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
3 |# a( x" q- H- V6 h0 qbmInfo.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;
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);
$ v1 Y) D4 m0 u6 i// Delay...
Sleep(nDelay);