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
. z+ R; z- {( H" q; H6 p4 h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
- i7 s$ Y  J6 C8 r' I! `函数设置调色板，改变显示结果。
1 p1 G1 v' G+ x' @. v. q2、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
) d1 u- c7 [3 W, E# _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：
4 @- |* j- o+ I& U8 |//hDIB -位图句柄
//color -指定背景色
% I4 [+ R# l6 a; W. o' l" @8 f//xDest -显示位图的左上角x坐标
/ ?0 ]) j6 X) G7 k+ c//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
6 O+ b, {$ _- t6 P* t! c" E$ R! Y' k//nFlag -淡入淡出标志 1--淡入 其它--淡出
. r" A( }0 p1 j! m% P& Avoid FadeInORFadeOut( CDC *pDC, HANDLE hDIB, COLORREF color, int xDest, int yDest,
int nLoops, int nDelay ,int nFlag)
7 N2 E, U1 [1 |0 P/ eint i,j;
. b2 Z( X1 @" o2 s) ~3 t7 s/ x6 b) cHPALETTE hPal;
PALETTEENTRY pAnimate[256];
PALETTEENTRY pOriginal[256];
CPalette pal;
// 创建236色调色板
. z* }( f2 L4 U# p　
9 j7 h1 a- V# A; {" x) f2 X* Y5 K0 ^BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
* y7 s; ?; M. |　
' E( ?- j, L- f9 C$ G  X+ hint nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount;
/ b; U# w8 [! W( ]' fint nWidth = bmInfo.bmiHeader.biWidth;
int nHeight = bmInfo.bmiHeader.biHeight;
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
int clrRValue = GetRValue(color);
$ _  V, N7 [  V2 ^- c7 Cint clrGValue = GetGValue(color);
4 Q& k/ j, x% o0 nint clrBValue = GetBValue(color);
if( pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE && nColors <= 256 )
+ t* F' v" w& L3 I. m& xif (!(hPal = Create236Palette(hDIB)))
return;
5 ^6 h% w& W0 l2 dpal.Attach( hPal );
; P% V5 b2 B8 e1 ^+ l: w" T// 得到调色板初始值
GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pOriginal);
8 n9 z3 y7 ^6 d9 w2 O/ ?9 z// 设定动态调色板初始值为指定色
if(nFlag==1)
) e. i4 H% n% F- n* ifor (j = 0; j < nColors; j++)
4 ?7 {7 [( e9 W. U) w- ?9 {pAnimate[j].peRed = clrRValue;
pAnimate[j].peGreen = clrGValue;
pAnimate[j].peBlue = clrBValue;
pAnimate[j].peFlags = PC_RESERVED;
else
# \$ t' ~1 k9 G% I* S' Z6 m  cGetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
CPalette *pOldPalette = pDC->SelectPalette(&pal, FALSE);
* ?+ ^2 |3 C: r5 y) H. ]( |* \6 DpDC->RealizePalette();
9 E& j- c3 G' u, s. T8 eCDC memDC;
* c1 I$ U& A; r; P# ]memDC.CreateCompatibleDC( pDC );
7 p: {  I9 c6 X4 L$ t# j5 BCBitmap bmp;
+ y) i3 `. O; _+ cbmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
CPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
memDC.RealizePalette();
9 y  }' O: d& J::SetDIBitsToDevice(memDC.m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
AnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&pAnimate);
& s. D! p2 h9 Q9 U1 Y0 F# R% ]pDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
// 淡入淡出
for( i=1; i <= nLoops; i++ )
. b3 e: x, H- {9 ?( A, ?+ ~for (j = 0; j < nColors; j++)
8 c' D) `# B: _  }3 pif(nFlag==1)
) Z/ H: e" M+ ~9 c0 B* YpAnimate[j].peRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
pAnimate[j].peGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
4 t3 j4 O2 J% }1 Y  \0 HpAnimate[j].peBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
pAnimate[j].peRed = pOriginal[j].peRed - ((pOriginal[j].peRed - clrRValue)*i)/nLoops;
% i+ N4 U) J8 o8 F/ K5 GpAnimate[j].peGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen - clrGValue)*i)/nLoops;
pAnimate[j].peBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue - clrBValue)*i)/nLoops;
% e+ F# Z9 w# U9 ?: S; Opal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&pAnimate);
: c8 E5 j# X; `' Y/ b! D; c// Delay...
' ?4 A( o$ W! V% b6 }Sleep(nDelay);
* E  A) R! T, J/ T1 O8 hmemDC.SelectPalette(pOldMemPalette, FALSE);
memDC.SelectObject( pOldBitmap );
5 D8 d4 }# r3 Z5 n; f" {* {pDC->SelectPalette(pOldPalette, FALSE);
7 P8 u2 D% N9 p, A5 S, welse if( (pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE) == 0 && nColors <= 256 )
: ?' b1 p5 j+ ^! e  X. L  |7 G, [for( int i=0; i < nColors; i++)
pOriginal.peRed = bmInfo.bmiColors.rgbRed ;
" j! j! c+ m' A$ JpOriginal.peGreen = bmInfo.bmiColors.rgbGreen;
pOriginal.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);
) z/ n1 C6 t+ n( k4 H$ n- {// 淡入淡出
for( i=1; i <= nLoops; i++ )
3 G3 Q1 j3 Q/ jfor (j = 0; j < nColors; j++)
if(nFlag==1)
/ f7 h0 ~+ q! u+ g1 abmInfo.bmiColors[j].rgbRed = clrRValue - ((clrRValue-pOriginal[j].peRed)*i)/nLoops;
bmInfo.bmiColors[j].rgbGreen = clrGValue - ((clrGValue-pOriginal[j].peGreen)*i)/nLoops;
# m/ y' s1 p- ^bmInfo.bmiColors[j].rgbBlue = clrBValue - ((clrBValue-pOriginal[j].peBlue)*i)/nLoops;
else
. d$ t' @5 ^! ?5 IbmInfo.bmiColors[j].rgbRed = pOriginal[j].peRed - ((pOriginal[j].peRed-clrRValue)*i)/nLoops;
& S2 w, P6 v% SbmInfo.bmiColors[j].rgbGreen = pOriginal[j].peGreen - ((pOriginal[j].peGreen-clrGValue)*i)/nLoops;
6 v* T7 i, m' M( q3 q( R2 EbmInfo.bmiColors[j].rgbBlue = pOriginal[j].peBlue - ((pOriginal[j].peBlue-clrBValue)*i)/nLoops;
, x" e! v" k; g5 {3 B) h::SetDIBitsToDevice(pDC->m_hDC,0,0,nWidth,nHeight,0,0,0,nHeight,lpDIBBits,(LPBITMAPINFO)hDIB,DIB_RGB_COLORS);
7 A/ l, C5 i0 k" k# f// Delay...
% b. L8 ^2 }9 l3 p/ ^Sleep(nDelay);