MFC中实现调色板动画实现淡入淡出 - 工控编程吧

<blockquote>// CreateReservedPalette<span style="white-space:pre"> </span>- Create a palette using the PC_RESERVED flag

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// FadeIn - Draws a start color and fades the bitmap in.
// pDC - Pointer to the device context to draw in
// hDIB - Handle to a device-independent bitmap
// clrStart - The start color of the bitmap
// xDest - x-coordinate of upper-left corner of dest. rect.
// yDest - y-coordinate of upper-left corner of dest. rect.
// nLoops - How many loops to fade the image in
// nDelay - Delay in milli-seconds between each loop
//
void FadeIn( CDC *pDC, HANDLE hDIB, COLORREF clrStart, int xDest, int yDest,
int nLoops, int nDelay )
{
HPALETTE hPal;
PALETTEENTRY peAnimate[256];
PALETTEENTRY peOriginal[256];
CPalette pal;
// Create a 236 colors or less logical palette with PC_RESERVED set
if (!(hPal = CreateReservedPalette(hDIB)))
return;
// The palette will be deleted when the CPalette object is destroyed
pal.Attach( hPal );
BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount; int nWidth="bmInfo.bmiHeader.biWidth;" int nHeight="bmInfo.bmiHeader.biHeight;" // Obtain the original entries in the palette GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&peOriginal); // Change all the entries in the palette to the start color int clrRValue="GetRValue(clrStart);" int clrGValue="GetGValue(clrStart);" int clrBValue="GetBValue(clrStart);" for (int j="0;" j < nColors; j++) { peAnimate[j].peRed="clrRValue;" peAnimate[j].peGreen="clrGValue;" peAnimate[j].peBlue="clrBValue;" peAnimate[j].peFlags="PC_RESERVED;" } // Select the palette CPalette *pOldPalette="pDC-"SelectPalette(&pal, FALSE);
pDC->RealizePalette();
// We need to draw the image so that it appears as a rectangle
// with the start color. At the same time we don't want the
// colors to be remapped, otherwise all the pixels would remain
// the same color. We use a memory DC to achieve this.
CDC memDC;
memDC.CreateCompatibleDC( pDC );
CBitmap bmp;
bmp.CreateCompatibleBitmap( pDC, nWidth, nHeight );
CBitmap *pOldBitmap = memDC.SelectObject( &bmp );
CPalette *pOldMemPalette = memDC.SelectPalette(&pal, FALSE);
memDC.RealizePalette();
// Draw the image to memDC
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
::SetDIBitsToDevice(memDC.m_hDC, // hDC
0, // XDest
0, // YDest
nWidth, // nDestWidth
nHeight, // nDestHeight
0, // XSrc
0, // YSrc
0, // nStartScan
nHeight, // nNumScans
lpDIBBits, // lpBits
(LPBITMAPINFO)hDIB, // lpBitsInfo
DIB_RGB_COLORS); // wUsage
// Set the color to start color
AnimatePalette(hPal, 0, nColors, (LPPALETTEENTRY)&peAnimate);
// Now copy the image from the memory DC
// Since the palettes in memDC and pDC are the same, no color mapping
// takes place. The image will appear in the start color
pDC->BitBlt(xDest, yDest, nWidth, nHeight, &memDC,0,0,SRCCOPY );
// Fade in
for( int i=1; i <= nLoops; i++ ) { for (j="0;" j < nColors; j++) { peAnimate[j].peRed="clrRValue" ((clrRValue-peOriginal[j].peRed)*i)/nLoops; peAnimate[j].peGreen="clrGValue" ((clrGValue-peOriginal[j].peGreen)*i)/nLoops; peAnimate[j].peBlue="clrBValue" ((clrBValue-peOriginal[j].peBlue)*i)/nLoops; } pal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&peAnimate); // Delay... Sleep(nDelay); } // Reselect old objects into DC memDC.SelectPalette(pOldMemPalette, FALSE); memDC.SelectObject( pOldBitmap ); pDC-SelectPalette(pOldPalette, FALSE);
}

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// FadeOut - Draws a bitmap and fades it out to the desired end color
// pDC - Pointer to the device context to draw in
// hDIB - Handle to a device-independent bitmap
// clrEnd - The final color of the bitmap
// xDest - x-coordinate of upper-left corner of dest. rect.
// yDest - y-coordinate of upper-left corner of dest. rect.
// nLoops - How many loops to fade the image out.
// nDelay - Delay in milli-seconds between each loop
//
void FadeOut( CDC *pDC, HANDLE hDIB, COLORREF clrEnd, int xDest, int yDest,
int nLoops, int nDelay )
{
HPALETTE hPal;
PALETTEENTRY peAnimate[256];
PALETTEENTRY peOriginal[256];
CPalette pal;
// Create a 236 colors or less logical palette with PC_RESERVED set
if (!(hPal = CreateReservedPalette(hDIB)))
return;
// The palette will be deleted when the CPalette object is destroyed
pal.Attach( hPal );
BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
int nColors = bmInfo.bmiHeader.biClrUsed ? bmInfo.bmiHeader.biClrUsed :
1 << bmInfo.bmiHeader.biBitCount; int nWidth="bmInfo.bmiHeader.biWidth;" int nHeight="bmInfo.bmiHeader.biHeight;" // Obtain the original entries in the palette GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&peAnimate); GetPaletteEntries(hPal, 0, nColors, (LPPALETTEENTRY)&peOriginal); // Get end color values int clrRValue="GetRValue(clrEnd);" int clrGValue="GetGValue(clrEnd);" int clrBValue="GetBValue(clrEnd);" // Select the palette CPalette *pOldPalette="pDC-"SelectPalette(&pal, FALSE);
pDC->RealizePalette();
// Draw the image
LPVOID lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
::SetDIBitsToDevice(pDC->m_hDC, // hDC
xDest, // XDest
yDest, // YDest
nWidth, // nDestWidth
nHeight, // nDestHeight
0, // XSrc
0, // YSrc
0, // nStartScan
nHeight, // nNumScans
lpDIBBits, // lpBits
(LPBITMAPINFO)hDIB, // lpBitsInfo
DIB_RGB_COLORS); // wUsage
// Fade out
for( int i=1; i <= nLoops; i++ ) { for (int j="0;" j < nColors; j++) { peAnimate[j].peRed="peOriginal[j].peRed" ((peOriginal[j].peRed clrRValue)*i)/nLoops; peAnimate[j].peGreen="peOriginal[j].peGreen" ((peOriginal[j].peGreen clrGValue)*i)/nLoops; peAnimate[j].peBlue="peOriginal[j].peBlue" ((peOriginal[j].peBlue clrBValue)*i)/nLoops; } pal.AnimatePalette(0, nColors, (LPPALETTEENTRY)&peAnimate); // Delay... Sleep(nDelay); } // Reselect old objects into DC pDC-SelectPalette(pOldPalette, FALSE);
}

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