指定背景的淡入淡出

天云上人

创建步骤：
9 A! ^& q' Y# |3 o  P7 W$ V1、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
( o: H/ a) U  w6 E. x7 e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
" O" y8 R* Z& r- d& a2 \0 |函数设置调色板，改变显示结果。
  W. p% n4 _5 W9 D3 A( a2、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
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
) [7 V- x7 k! u3 {% E% F+ m//参数说明：
' q+ G9 X7 J' V9 U//hDIB -位图句柄
' f2 n- ~+ D9 \4 W. A  L//color -指定背景色
& @9 c% m/ F' s//xDest -显示位图的左上角x坐标
$ P( O2 N& P5 r% L* V6 N9 _//yDest -显示位图的左上角y坐标
7 g' E  Y2 P0 z+ c3 S5 Q//nLoops -循环次数
9 p1 h: G3 ~7 |+ O) X& ~//nDelay -每次循环中的延时
0 r1 _4 ^5 X- B//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,
' j" e1 [& g& t2 h5 O3 z' ~int nLoops, int nDelay ,int nFlag)
int i,j;
HPALETTE hPal;
PALETTEENTRY pAnimate[256];
PALETTEENTRY pOriginal[256];
CPalette pal;
// 创建236色调色板
0 g; A' r" K4 G% Y3 c$ F　
7 l( P4 ~& v: ?8 O, ]9 L8 NBITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
　
int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount;
int nWidth = bmInfo.bmiHeader.biWidth;
: ^/ u' v$ G% z4 L5 aint nHeight = bmInfo.bmiHeader.biHeight;
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
; N! K7 k6 u) `" x9 a! ~int clrRValue = GetRValue(color);
int clrGValue = GetGValue(color);
1 v1 f, k* D" T5 _% Eint clrBValue = GetBValue(color);
* Z1 ^  m8 G/ p. l) h7 X, a, I* tif( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
3 D+ Q# j5 M1 Z+ y4 {if (!(hPal = Create236Palette(hDIB)))
' i! |1 Z$ M: K) ~return;
pal.Attach( hPal );
% _  z# b4 h$ J( t// 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)
5 j  k( n- d  P/ Afor (j = 0; j < nColors; j++)
0 q8 m+ S9 ]& i7 C4 m  X7 E' D( PpAnimate[j].peRed = clrRValue;
2 {# K$ Y7 f+ @pAnimate[j].peGreen = clrGValue;
8 A5 [; c  \) L3 W4 f% `9 z9 U5 _pAnimate[j].peBlue = clrBValue;
pAnimate[j].peFlags = PC_RESERVED;
else
0 j7 g: W+ I* S7 J( g6 y# d: d2 h& U! FGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
CPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
pDC->RealizePalette();
1 {: b- L' k1 h& \% v8 ICDC memDC;
- q9 f4 z; Z# ]* b, l, O. pmemDC.CreateCompatibleDC( pDC );
+ w0 z# a/ ?9 f) m6 u. z- K0 K. FCBitmap bmp;
bmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
3 K6 @9 q+ ~9 e1 V/ O$ S' KCPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
$ L2 }  u. z8 I* d  |( C$ wmemDC.RealizePalette();
::SetDIBitsToDevice(memDC.m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
# o4 A: ?) U" f/ k" f3 q, ?AnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
pDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
// 淡入淡出
for( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
6 e9 k) S  B- `- _if(nFlag==1)
pAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
pAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
2 j4 b* c" [! Y/ `5 k) e+ OpAnimate[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);
// Delay...
Sleep(nDelay);
memDC.SelectPalette(pOldMemPalette, FALSE);
memDC.SelectObject( pOldBitmap );
pDC->SelectPalette(pOldPalette, FALSE);
else if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
* L. `8 {* E+ J* A$ [" gfor( int i=0; i < nColors; i++)
: E" Y, ?4 L* k/ l% a8 s; p8 ypOriginal.peRed = bmInfo.bmiColors.rgbRed ;
8 l# @& H: f4 h4 I/ }pOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
pOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
& N* t# G3 F0 k- s' {if(nFlag==1)
bmInfo.bmiColors.rgbRed = clrRValue;
$ P* o  P7 C3 j6 k' ?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);
/ E3 q% s: a- m; S) N+ L+ v// 淡入淡出
2 I( ], l  j' @# {9 I) Hfor( i=1; i <= nLoops; i++ )
for (j = 0; j < nColors; j++)
6 b$ ^; w. P# V3 z* Tif(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
bmInfo.bmiColors[j].rgbRed = pOriginal[j].peRed - ((pOriginal[j].peRed-clrRValue)*i)/nLoops;
6 w- u" \0 w! X* tbmInfo.bmiColors[j].rgbGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen-clrGValue)*i)/nLoops;
) E0 y5 R- G( J( p) h" e8 }4 ?. LbmInfo.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...
Sleep(nDelay);