指定背景的淡入淡出

天云上人

创建步骤：
8 P1 q) ]/ F( H" O; ?/ 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。
/ t4 u6 R9 e' w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
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
* g& j. w1 b# ]5 ^, f. n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
$ b5 C+ U! A. L! p! h. N& I0 L, C//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
# y. l$ d) D# L, j! `/ b//nLoops -循环次数
. C& @9 O' ]1 R7 X# C+ g$ n//nDelay -每次循环中的延时
( ~3 {; S! I& G8 c) s5 _/ C, a//nFlag -淡入淡出标志 1--淡入 其它--淡出
# q3 y( N5 f) ]7 y8 Vvoid FadeInORFadeOut( CDC *pDC, HANDLE hDIB, COLORREF color, int xDest, int yDest,
' _' C) a0 f! a! d, L' Zint nLoops, int nDelay ,int nFlag)
int i,j;
HPALETTE hPal;
PALETTEENTRY pAnimate[256];
5 t: q& u7 u9 i* KPALETTEENTRY pOriginal[256];
CPalette pal;
// 创建236色调色板
　
( y/ J4 ?( S: O0 ABITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
　
int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount;
1 n$ i  \$ ~6 s/ uint nWidth = bmInfo.bmiHeader.biWidth;
int nHeight = bmInfo.bmiHeader.biHeight;
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
int clrRValue = GetRValue(color);
int clrGValue = GetGValue(color);
int clrBValue = GetBValue(color);
3 u% `2 u1 x/ t5 O) ]" tif( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
if (!(hPal = Create236Palette(hDIB)))
return;
pal.Attach( hPal );
// 得到调色板初始值
, C/ o9 H. R3 ^9 oGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
. x9 i7 p0 Z$ I5 m) T' ^' d// 设定动态调色板初始值为指定色
if(nFlag==1)
for (j = 0; j < nColors; j++)
pAnimate[j].peRed = clrRValue;
& r& Y) z" h/ i$ _7 y, |pAnimate[j].peGreen = clrGValue;
, e6 }/ a6 C% \" xpAnimate[j].peBlue = clrBValue;
! }( c' h  M2 V3 t% b* O6 T6 ^pAnimate[j].peFlags = PC_RESERVED;
; O; L. W: ?" F: X; X; v1 P* }else
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
' }9 K. X' q$ P1 ?9 H* M: n) xCPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
% u8 X4 L, V" }pDC->RealizePalette();
. W* W# U4 ?6 ?# V- X. sCDC memDC;
memDC.CreateCompatibleDC( pDC );
CBitmap bmp;
bmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
' ^; C6 J, C  B# ~$ y! C, \CPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
- d' S& ^! N3 ~: D7 j. n2 @  zmemDC.RealizePalette();
5 a8 a3 f2 W7 Q2 N2 T4 {* w1 A::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 );
0 S+ I! C2 n1 r5 h9 F% `// 淡入淡出
- N: z: E: b9 b1 g6 S7 Gfor( i=1; i <= nLoops; i++ )
+ [& l/ ^5 w8 F7 p0 hfor (j = 0; j < nColors; j++)
: R' m5 I! d, r4 y1 yif(nFlag==1)
& x" o5 y; r5 C: qpAnimate[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;
: g& C" W+ }2 X" j/ j- r  I2 aelse
pAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
pAnimate[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);
) }9 o. u2 ]* h3 O// Delay...
1 c7 p6 ~: \# r4 F: P, wSleep(nDelay);
memDC.SelectPalette(pOldMemPalette, FALSE);
memDC.SelectObject( pOldBitmap );
- v1 P: a9 w+ tpDC->SelectPalette(pOldPalette, FALSE);
) g6 }2 y. d5 Q% }* gelse if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
for( int i=0; i < nColors; i++)
) \* a+ i* N+ z; I- N6 N9 kpOriginal.peRed = bmInfo.bmiColors.rgbRed ;
pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
$ ^. w; A6 B- @% c+ M' a: X% R* q) OpOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
if(nFlag==1)
bmInfo.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);
1 `# H$ }! q, D  C2 f9 r. {// 淡入淡出
4 o% Q. H  Y: N2 gfor( i=1; i <= nLoops; i++ )
2 ?( q7 r4 ]2 t- F& B9 `) d, ~for (j = 0; j < nColors; j++)
if(nFlag==1)
1 w* N0 \) P4 Y0 Z9 e3 ObmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
bmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
1 O$ [+ p5 v% kbmInfo.bmiColors[j].rgbBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
9 r; t2 }9 E+ D" Jelse
3 ^* q$ _: F" C: IbmInfo.bmiColors[j].rgbRed = pOriginal[j].peRed - ((pOriginal[j].peRed-clrRValue)*i)/nLoops;
$ K  @- ]+ ^4 p( z% t4 d/ SbmInfo.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;
/ w5 t0 N9 O$ x( g5 }7 d::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
/ [5 R' i! ?; d3 f% j// Delay...
Sleep(nDelay);