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。
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
/ B- M9 l# G; _$ i7 S. j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
, q" P2 [; A6 t* ^2 d函数设置调色板，改变显示结果。
* _" {7 m/ ?! ^% A8 E2、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
; j$ o0 m0 Q3 ~改位图调色板，显示位图改变显示结果
5 o) f# n3 V' b# Y/ X! Q返回：位图的淡入淡出
  N' P# e) i; i9 c1 \* q//参数说明：
//hDIB -位图句柄
//color -指定背景色
//xDest -显示位图的左上角x坐标
6 g* W) s) k' Y: K6 H8 v- p* Y. `//yDest -显示位图的左上角y坐标
//nLoops -循环次数
//nDelay -每次循环中的延时
//nFlag -淡入淡出标志 1--淡入 其它--淡出
; _2 K8 w! [- K0 ?void FadeInORFadeOut( CDC *pDC, HANDLE hDIB, COLORREF color, int xDest, int yDest,
! c( J! l& }4 x3 Qint nLoops, int nDelay ,int nFlag)
int i,j;
9 H$ f! @- ]2 N" B& W' |/ FHPALETTE hPal;
PALETTEENTRY pAnimate[256];
# R  F- d% V0 ~5 b$ M* ^PALETTEENTRY pOriginal[256];
CPalette pal;
// 创建236色调色板
3 l- f3 D3 r. z( p7 _7 d　
1 r( T" O5 C- ]: W/ K, wBITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
, Q: y. b" v2 p! U　
3 E& V, r5 u( c7 ^int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount;
int nWidth = bmInfo.bmiHeader.biWidth;
# c. d' ^% q. X. G. N$ {0 Z9 Iint nHeight = bmInfo.bmiHeader.biHeight;
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
int clrRValue = GetRValue(color);
! l( h9 N8 G7 u- ?int clrGValue = GetGValue(color);
int clrBValue = GetBValue(color);
if( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
if (!(hPal = Create236Palette(hDIB)))
return;
pal.Attach( hPal );
2 d: E9 x7 [1 d2 A// 得到调色板初始值
& x. s/ q. f7 ^( |) w5 G8 m% d9 mGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
, b5 V. J# T% f' ~" P7 P// 设定动态调色板初始值为指定色
& s* e8 u. B, _! ^if(nFlag==1)
for (j = 0; j < nColors; j++)
' W2 }. d" F* T2 ApAnimate[j].peRed = clrRValue;
  K. X3 F# y4 s) _pAnimate[j].peGreen = clrGValue;
pAnimate[j].peBlue = clrBValue;
2 h& t# n' X& ?8 S# Q5 C. d$ c% c. @pAnimate[j].peFlags = PC_RESERVED;
else
' ~! p) t5 `' O; J3 z2 B; ^0 s  TGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
! w7 r. _% v7 TCPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
pDC->RealizePalette();
) \4 Q. |) e9 y* k- [  HCDC memDC;
memDC.CreateCompatibleDC( pDC );
4 U- J9 F( }- x. Y7 ^( uCBitmap bmp;
0 }' V# r% g2 w9 P- \bmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
1 f( D- G! O# J. @9 B% y6 i$ X; mCBitmap *pOldBitmap = memDC.SelectObject( &bmp );
CPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
memDC.RealizePalette();
( F* r7 b6 P& b) E1 Z% m* l! m* F::SetDIBitsToDevice(memDC.m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
" |6 m; W% K- q7 a, hAnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
pDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
+ ?$ F# r, m6 g// 淡入淡出
for( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
if(nFlag==1)
4 ~8 j* K8 f2 {- K$ R/ 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;
else
0 J8 G' N+ r& r% ipAnimate[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);
2 e3 _. W0 _2 @' q: p* X// Delay...
3 t: F* k( X! M( m) r5 V" X) b8 P9 sSleep(nDelay);
memDC.SelectPalette(pOldMemPalette, FALSE);
memDC.SelectObject( pOldBitmap );
pDC->SelectPalette(pOldPalette, FALSE);
2 p  k! d0 D( @- Z. U2 {, n" d; Welse if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
- s( E/ e  {7 m, @8 B+ x; Wfor( int i=0; i < nColors; i++)
5 Q7 O  o1 u$ IpOriginal.peRed = bmInfo.bmiColors.rgbRed ;
pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
pOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
if(nFlag==1)
bmInfo.bmiColors.rgbRed = clrRValue;
) J" K: S# [$ h9 K/ L: p/ O3 BbmInfo.bmiColors.rgbGreen = clrGValue;
! t$ U$ m* I, E" P( cbmInfo.bmiColors.rgbBlue = clrBValue;
1 i. _, D( b5 ?0 Z/ {::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
// 淡入淡出
8 E' K. I/ _9 {! Afor( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
$ m9 }: Y9 Y; @' F6 R. sif(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
5 [- H1 M% M0 cbmInfo.bmiColors[j].rgbRed = pOriginal[j].peRed - ((pOriginal[j].peRed-clrRValue)*i)/nLoops;
/ t) z+ d$ b4 SbmInfo.bmiColors[j].rgbGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen-clrGValue)*i)/nLoops;
% P- u! u/ v0 W" @2 X, CbmInfo.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);
// Delay...
' ]4 a8 [% e9 p5 D; u- y. U* HSleep(nDelay);