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。
$ @5 e1 z* J- r; \$ F: u  d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
" s6 C0 O; z  L; B! Q4 Z4 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
. J  O$ k1 u! M/ y' 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：
- ?% A& ?+ ]0 F" D//hDIB -位图句柄
//color -指定背景色
. Y) T/ W- I! q7 }, Q//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
; h" ], ?+ }, |' Q! m, M//nDelay -每次循环中的延时
//nFlag -淡入淡出标志 1--淡入 其它--淡出
" Z* `5 I- U/ J7 A- H! uvoid FadeInORFadeOut( CDC *pDC, HANDLE hDIB, COLORREF color, int xDest, int yDest,
5 Y. `& x6 k- {# jint nLoops, int nDelay ,int nFlag)
% }5 \  M9 a( z" jint i,j;
- |2 u4 z1 U* c+ KHPALETTE hPal;
* d- S4 w7 Q4 v8 ~, F4 VPALETTEENTRY pAnimate[256];
5 s6 H8 S6 {" y' \, \; f9 G5 ?2 ZPALETTEENTRY pOriginal[256];
CPalette pal;
// 创建236色调色板
　
' |0 w0 O5 d4 I. ^BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
　
int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
7 O$ A% F% A9 c+ ?4 f% C1 << bmInfo.bmiHeader.biBitCount;
  p" F% h; ^. J4 i9 ^4 d! O: l( [" K" Tint nWidth = bmInfo.bmiHeader.biWidth;
( B$ F+ ?: D. P5 |) n2 U, d" ~int nHeight = bmInfo.bmiHeader.biHeight;
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
1 M: M7 Y; r3 ^. S  Dint clrRValue = GetRValue(color);
; }7 P9 j9 l* g3 Z. I  f; Bint clrGValue = GetGValue(color);
$ N4 e3 u6 \1 B0 p; P" T" Lint clrBValue = GetBValue(color);
if( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
& b" M; s9 A- U8 {" fif (!(hPal = Create236Palette(hDIB)))
return;
pal.Attach( hPal );
/ ^3 @- h$ N2 R) G2 K9 m// 得到调色板初始值
3 ]! X+ {6 O" [5 JGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
// 设定动态调色板初始值为指定色
if(nFlag==1)
4 F5 ^1 y% _9 R, _% S0 m# U0 L+ sfor (j = 0; j < nColors; j++)
pAnimate[j].peRed = clrRValue;
pAnimate[j].peGreen = clrGValue;
8 t- n, ^6 M4 `% d( E4 IpAnimate[j].peBlue = clrBValue;
. G# x4 U* H3 \3 ?' ]pAnimate[j].peFlags = PC_RESERVED;
! X7 ^% U! m& u" \: E- X8 jelse
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
CPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
pDC->RealizePalette();
CDC memDC;
8 T" {0 d7 P$ ~1 _memDC.CreateCompatibleDC( pDC );
, s0 E' X2 a6 X, OCBitmap bmp;
" ~: o- v. ~% nbmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
8 P! i+ `: p+ G2 v* r* |/ t* yCPalette *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);
AnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
' A( g$ e1 L0 ]5 }8 t/ B2 BpDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
// 淡入淡出
3 G+ m* e0 p7 ~2 l4 b2 Jfor( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
if(nFlag==1)
" ^+ X5 ^. f7 A) dpAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
pAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
4 O: v% s  G5 q" rpAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
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 y4 l6 I+ w9 x/ |$ F3 P// Delay...
Sleep(nDelay);
memDC.SelectPalette(pOldMemPalette, FALSE);
5 [% C" |! N/ q: H6 P5 n+ H2 pmemDC.SelectObject( pOldBitmap );
pDC->SelectPalette(pOldPalette, FALSE);
5 T* ^6 Z8 v; Jelse if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
for( int i=0; i < nColors; i++)
pOriginal.peRed = bmInfo.bmiColors.rgbRed ;
pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
pOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
1 j8 L  I$ `2 P5 u: wif(nFlag==1)
7 q$ ~: h# E3 K* Q/ C8 u+ zbmInfo.bmiColors.rgbRed = clrRValue;
- P0 e7 [  W7 q5 \bmInfo.bmiColors.rgbGreen = clrGValue;
bmInfo.bmiColors.rgbBlue = clrBValue;
% N8 `( O0 H  `  G, C::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
// 淡入淡出
3 o) ^9 ]' X9 y8 Q5 u$ bfor( i=1; i <= nLoops; i++ )
. \5 U( b+ b" I+ T3 ?, p) Hfor (j = 0; j < nColors; j++)
if(nFlag==1)
bmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
) _0 Y) ^  ?' u3 t3 o5 DbmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
2 n8 s$ F  a  E# a; p( ]1 a9 gbmInfo.bmiColors[j].rgbBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
0 v' F  J* ?% p4 n% D6 Jelse
# \" \8 F6 m* o7 B5 k- lbmInfo.bmiColors[j].rgbRed = pOriginal[j].peRed - ((pOriginal[j].peRed-clrRValue)*i)/nLoops;
; W! V+ b+ ^  H2 T) Y- R2 @8 BbmInfo.bmiColors[j].rgbGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen-clrGValue)*i)/nLoops;
0 M' r6 Z5 a5 Y/ UbmInfo.bmiColors[j].rgbBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue-clrBValue)*i)/nLoops;
: v% Z) j" c6 z0 O6 F0 z::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
+ k+ q. M3 D8 [/ M: M* Q2 n, q0 }// Delay...
0 n3 D, G6 j4 u/ t6 f, ISleep(nDelay);