指定背景的淡入淡出

天云上人

创建步骤：
( A* h1 I' t6 c! F. S* R$ u1、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
6 b9 Z  j  y) H8 ~, R# G6 b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
* S1 s. f0 M. z$ i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
* a4 x: s4 T: y6 e7 ]7 t* c5 p8 M//参数说明：
2 C# j9 h, J+ J! b5 I6 h//hDIB -位图句柄
8 g9 Q4 x9 j8 E( B+ A//color -指定背景色
& ^8 o" j0 d6 a2 O6 B5 e6 w//xDest -显示位图的左上角x坐标
//yDest -显示位图的左上角y坐标
* a$ v- [- p9 J' f1 O//nLoops -循环次数
0 D1 o1 S2 F/ |( S( Q//nDelay -每次循环中的延时
//nFlag -淡入淡出标志 1--淡入 其它--淡出
% H" X4 T& c. r" ?7 Ivoid FadeInORFadeOut( CDC *pDC, HANDLE hDIB, COLORREF color, int xDest, int yDest,
int nLoops, int nDelay ,int nFlag)
# S3 B$ }2 X7 x1 R; {int i,j;
4 O4 A+ ^# X, n6 C+ R( F' L% ZHPALETTE hPal;
PALETTEENTRY pAnimate[256];
PALETTEENTRY pOriginal[256];
CPalette pal;
. y% O' B1 J6 {// 创建236色调色板
　
BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
  @" b' A2 v7 ?8 Z/ |% m# r! Z# e　
int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
- @* V, h7 R4 ~% e1 << bmInfo.bmiHeader.biBitCount;
- x% v* v7 K* g) c: z0 Q5 Gint nWidth = bmInfo.bmiHeader.biWidth;
9 M" Q9 o5 W, c0 fint nHeight = bmInfo.bmiHeader.biHeight;
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
int clrRValue = GetRValue(color);
int clrGValue = GetGValue(color);
0 V  D; u3 y9 G, h  P8 s5 k: m  ]int clrBValue = GetBValue(color);
9 f1 y6 y& t/ k# d8 s+ Y, {0 ~; Vif( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
if (!(hPal = Create236Palette(hDIB)))
7 b. n9 d9 N/ f5 Breturn;
pal.Attach( hPal );
// 得到调色板初始值
6 ]8 j8 z0 r! O3 D7 tGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
// 设定动态调色板初始值为指定色
if(nFlag==1)
- S* t/ Y2 @# T/ k$ \- H2 V7 vfor (j = 0; j < nColors; j++)
pAnimate[j].peRed = clrRValue;
+ a" H4 @( P: p( n% [' hpAnimate[j].peGreen = clrGValue;
pAnimate[j].peBlue = clrBValue;
pAnimate[j].peFlags = PC_RESERVED;
else
0 s; T) I* {; Q% w. q/ YGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
CPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
- {" F" Q" D# BpDC->RealizePalette();
, i1 t" ]" J6 h* o9 Z1 h9 z8 DCDC memDC;
! @) J9 K7 L- s4 S4 OmemDC.CreateCompatibleDC( pDC );
CBitmap bmp;
bmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
. J5 R) K; T& K9 wCPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
0 p: M/ {1 c  gmemDC.RealizePalette();
% H3 W& ]5 l1 K6 F7 `) L::SetDIBitsToDevice(memDC.m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
% g3 L( c0 X+ T* A* z3 j+ ?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++)
7 h) u4 u% h/ N- y8 U8 F& Cif(nFlag==1)
pAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
0 i& A4 L9 g4 ]2 ^pAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
pAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
$ [0 F, p8 c/ o/ T* D( apAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
" Q9 A$ n% B8 t$ Q6 OpAnimate[j].peGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen - clrGValue)*i)/nLoops;
5 Y! K" J4 a4 `2 mpAnimate[j].peBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue - clrBValue)*i)/nLoops;
pal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
5 `8 N) [+ T: j, Y6 W+ m& ]// Delay...
Sleep(nDelay);
# O' U" f8 j9 c% @memDC.SelectPalette(pOldMemPalette, FALSE);
* {- g# m- N6 x+ t5 M6 a) {' `. amemDC.SelectObject( pOldBitmap );
% b6 O- K4 z) E5 j0 ZpDC->SelectPalette(pOldPalette, FALSE);
else if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
for( int i=0; i < nColors; i++)
pOriginal.peRed = bmInfo.bmiColors.rgbRed ;
4 C* T. |9 f. WpOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
pOriginal.peBlue = bmInfo.bmiColors.rgbBlue ;
# W+ p& I0 E+ P: @( {if(nFlag==1)
+ Z! [8 {: B3 A& A5 P. lbmInfo.bmiColors.rgbRed = clrRValue;
$ c. d& @, F) b/ N+ Q  x& RbmInfo.bmiColors.rgbGreen = clrGValue;
bmInfo.bmiColors.rgbBlue = clrBValue;
7 D( g1 M9 ~( _) y::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
3 J, K2 t- e' |* X9 [: |$ x  y// 淡入淡出
for( i=1; i <= nLoops; i++ )
. w; |* ?* {: |( zfor (j = 0; j < nColors; j++)
! }5 A; q5 s9 ]0 ?. g/ }if(nFlag==1)
bmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
7 J7 R6 i2 b  N3 ^+ n$ o  ?bmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
. q3 O  b! E3 V% X6 KbmInfo.bmiColors[j].rgbBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
: x6 a3 A, A' l* z$ C, t# r( L9 selse
5 c3 \! E/ [0 {9 fbmInfo.bmiColors[j].rgbRed = pOriginal[j].peRed - ((pOriginal[j].peRed-clrRValue)*i)/nLoops;
6 F- p( r( c) P" W% ^& |bmInfo.bmiColors[j].rgbGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen-clrGValue)*i)/nLoops;
. {& b% j) z! A2 UbmInfo.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);
( [0 k$ o: G2 n* }- o( }5 X// Delay...
Sleep(nDelay);