MyBitmap.cpp
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上传日期:2010-02-15
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组合框控件
开发平台:
Visual C++
- // MyBitmap.cpp: implementation of the CMyBitmap class.
- //
- // History:
- // 2002.11.23
- // copy from kdphoto projects
- //
- //
- //
- //
- //////////////////////////////////////////////////////////////////////
- #include "stdafx.h"
- #include "MyBitmap.h"
- #ifdef _DEBUG
- #undef THIS_FILE
- static char THIS_FILE[]=__FILE__;
- #define new DEBUG_NEW
- #endif
- // TransparentBlt - Copies a bitmap transparently onto the destination DC
- // hdcDest - Handle to destination device context
- // nXDest - x-coordinate of destination rectangle's upper-left corner
- // nYDest - y-coordinate of destination rectangle's upper-left corner
- // nWidth - Width of destination rectangle
- // nHeight - height of destination rectangle
- // hBitmap - Handle of the source bitmap
- // nXSrc - x-coordinate of source rectangle's upper-left corner
- // nYSrc - y-coordinate of source rectangle's upper-left corner
- // colorTransparent - The transparent color
- // hPal - Logical palette to be used with bitmap. Can be NULL
- void MyTransparentBlt( HDC hdcDest, int nXDest, int nYDest, int nWidth,
- int nHeight, HBITMAP hBitmap, int nXSrc, int nYSrc,
- COLORREF colorTransparent, HPALETTE hPal )
- {
- CDC dc, memDC, maskDC, tempDC;
- dc.Attach( hdcDest );
- maskDC.CreateCompatibleDC(&dc);
- CBitmap maskBitmap;
- //add these to store return of SelectObject() calls
- CBitmap* pOldMemBmp = NULL;
- CBitmap* pOldMaskBmp = NULL;
- HBITMAP hOldTempBmp = NULL;
- memDC.CreateCompatibleDC(&dc);
- tempDC.CreateCompatibleDC(&dc);
- CBitmap bmpImage;
- bmpImage.CreateCompatibleBitmap( &dc, nWidth, nHeight );
- pOldMemBmp = memDC.SelectObject( &bmpImage );
- // Select and realize the palette
- if( dc.GetDeviceCaps(RASTERCAPS) & RC_PALETTE && hPal )
- {
- ::SelectPalette( dc, hPal, FALSE );
- dc.RealizePalette();
- ::SelectPalette( memDC, hPal, FALSE );
- }
- hOldTempBmp = (HBITMAP) ::SelectObject( tempDC.m_hDC, hBitmap );
- memDC.BitBlt( 0,0,nWidth, nHeight, &tempDC, nXSrc, nYSrc, SRCCOPY );
- // Create monochrome bitmap for the mask
- maskBitmap.CreateBitmap( nWidth, nHeight, 1, 1, NULL );
- pOldMaskBmp = maskDC.SelectObject( &maskBitmap );
- memDC.SetBkColor( colorTransparent );
- // Create the mask from the memory DC
- maskDC.BitBlt( 0, 0, nWidth, nHeight, &memDC,
- 0, 0, SRCCOPY );
- // Set the background in memDC to black. Using SRCPAINT with black
- // and any other color results in the other color, thus making
- // black the transparent color
- memDC.SetBkColor(RGB(0,0,0));
- memDC.SetTextColor(RGB(255,255,255));
- memDC.BitBlt(0, 0, nWidth, nHeight, &maskDC, 0, 0, SRCAND);
- // Set the foreground to black. See comment above.
- dc.SetBkColor(RGB(255,255,255));
- dc.SetTextColor(RGB(0,0,0));
- dc.BitBlt(nXDest, nYDest, nWidth, nHeight, &maskDC, 0, 0, SRCAND);
- // Combine the foreground with the background
- dc.BitBlt(nXDest, nYDest, nWidth, nHeight, &memDC,
- 0, 0, SRCPAINT);
- if (hOldTempBmp)
- ::SelectObject( tempDC.m_hDC, hOldTempBmp);
- if (pOldMaskBmp)
- maskDC.SelectObject( pOldMaskBmp );
- if (pOldMemBmp)
- memDC.SelectObject( pOldMemBmp );
- dc.Detach();
- }
- //////////////////////////////////////////////////////////////////////
- // Construction/Destruction
- //////////////////////////////////////////////////////////////////////
- CMyBitmap::CMyBitmap()
- {
- }
- CMyBitmap::~CMyBitmap()
- {
- }
- BOOL CMyBitmap::StretchDraw(CDC *pDC, LPRECT r, LPRECT sr )
- {
- if ( !r ) return FALSE;
- CDC dc;
- dc.CreateCompatibleDC( pDC );
- CBitmap * bmp = dc.SelectObject( this );
- pDC->SetStretchBltMode(COLORONCOLOR);
- if ( !sr )
- pDC->StretchBlt( r->left, r->top, r->right, r->bottom, &dc, 0, 0, GetWidth(), GetHeight() ,
- SRCCOPY );
- else
- pDC->StretchBlt( r->left, r->top, r->right - r->left, r->bottom - r->top, &dc, sr->left, sr->top,
- sr->right - sr->left, sr->bottom - sr->top,
- SRCCOPY );
- dc.SelectObject( bmp );
- return TRUE;
- }
- BOOL CMyBitmap::StretchDraw(CDC *pDC, LPRECT r)
- {
- CDC dc;
- dc.CreateCompatibleDC( pDC );
- CBitmap * bmp = dc.SelectObject( this );
- pDC->StretchBlt( r->left, r->top, r->right, r->bottom, &dc, 0, 0, GetWidth(), GetHeight() ,
- SRCCOPY );
- dc.SelectObject( bmp );
- return TRUE;
- }
- BOOL CMyBitmap::Draw( CDC *pDC, int x, int y, LPRECT sr, COLORREF colTrans, BOOL bTrans )
- {
- if ( !bTrans )
- Draw( pDC ,x, y, sr );
- else
- {
- MyTransparentBlt( pDC->GetSafeHdc(), x, y, sr->right - sr->left, sr->bottom - sr->top,
- (HBITMAP)this->GetSafeHandle(), sr->left, sr->top, colTrans, NULL );
- }
- return TRUE;
- }
- //draw sub bmp to special point
- BOOL CMyBitmap::Draw( CDC *pDC, int x, int y, LPRECT sr )
- {
- CDC dc;
- dc.CreateCompatibleDC( pDC );
- CBitmap * bmp = dc.SelectObject( this );
- if ( sr != NULL)
- pDC->BitBlt( x, y, sr->right - sr->left, sr->bottom - sr->top, &dc,
- sr->left, sr->top, SRCCOPY );
- else
- pDC->BitBlt( x, y, Width(), Height(), &dc,
- 0, 0, SRCCOPY );
- dc.SelectObject( bmp );
- return TRUE;
- }
- BOOL CMyBitmap::Draw(CDC *pDC, LPRECT r)
- {
- CDC dc;
- dc.CreateCompatibleDC( pDC );
- CBitmap * bmp = dc.SelectObject( this );
- pDC->BitBlt( r->left, r->top, r->right - r->left, r->bottom - r->top, &dc, 0, 0 ,
- SRCCOPY );
- dc.SelectObject( bmp );
- return TRUE;
- }
- ///HOWTO: Drawing Transparent Bitmaps
- //see: Microsoft Knowledge Base Article - Q79212
- BOOL CMyBitmap::DrawTransparent(CDC * pDC, int x, int y, COLORREF crColour)
- {
- MyTransparentBlt( pDC->GetSafeHdc(), x, y, GetWidth(), GetHeight(), (HBITMAP)this->GetSafeHandle(), 0, 0, crColour, NULL );
- /*
- COLORREF crOldBack = pDC->SetBkColor(0);
- COLORREF crOldText = pDC->SetTextColor(RGB(255,255,255));
- CDC dcImage, dcTrans;
- // Create two memory dcs for the image and the mask
- dcImage.CreateCompatibleDC(pDC);
- dcTrans.CreateCompatibleDC(pDC);
- // Select the image into the appropriate dc
- CBitmap* pOldBitmapImage = dcImage.SelectObject(this);
- // Create the mask bitmap
- CBitmap bitmapTrans;
- int nWidth = GetWidth();
- int nHeight = GetHeight();
- bitmapTrans.CreateBitmap(nWidth, nHeight, 1, 1, NULL);
- // Select the mask bitmap into the appropriate dc
- CBitmap* pOldBitmapTrans = dcTrans.SelectObject(&bitmapTrans);
- // Build mask based on transparent colour
- dcImage.SetBkColor(crColour);
- dcTrans.BitBlt(0, 0, nWidth, nHeight, &dcImage, 0, 0, SRCCOPY);
- // Do the work - True Mask method - cool if not actual display
- pDC->BitBlt(x, y, nWidth, nHeight, &dcImage, 0, 0, SRCINVERT);
- pDC->BitBlt(x, y, nWidth, nHeight, &dcTrans, 0, 0, SRCAND);
- pDC->BitBlt(x, y, nWidth, nHeight, &dcImage, 0, 0, SRCINVERT);
- // Restore settings
- dcImage.SelectObject(pOldBitmapImage);
- dcTrans.SelectObject(pOldBitmapTrans);
- pDC->SetBkColor(crOldBack);
- pDC->SetTextColor(crOldText);
- */
- return TRUE;
- }
- HRGN CMyBitmap::CreateRgnFromFile( COLORREF color )
- {
- HBITMAP hBmp = (HBITMAP)this->GetSafeHandle();
- // get image properties
- BITMAP bmp = { 0 };
- ::GetObject( hBmp, sizeof(BITMAP), &bmp );
- // allocate memory for extended image information
- LPBITMAPINFO bi = (LPBITMAPINFO) new BYTE[ sizeof(BITMAPINFO) + 8 ];
- memset( bi, 0, sizeof(BITMAPINFO) + 8 );
- bi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
- // set window size
- int m_dwWidth = bmp.bmWidth; // bitmap width
- int m_dwHeight = bmp.bmHeight; // bitmap height
- // create temporary dc
- HDC dc = CreateIC( "DISPLAY",NULL,NULL,NULL );
- // get extended information about image (length, compression, length of color table if exist, ...)
- DWORD res = GetDIBits( dc, hBmp, 0, bmp.bmHeight, 0, bi, DIB_RGB_COLORS );
- // allocate memory for image data (colors)
- LPBYTE pBits = new BYTE[ bi->bmiHeader.biSizeImage + 4 ];
- // allocate memory for color table
- if ( bi->bmiHeader.biBitCount == 8 )
- {
- // actually color table should be appended to this header(BITMAPINFO),
- // so we have to reallocate and copy it
- LPBITMAPINFO old_bi = bi;
- // 255 - because there is one in BITMAPINFOHEADER
- bi = (LPBITMAPINFO)new char[ sizeof(BITMAPINFO) + 255 * sizeof(RGBQUAD) ];
- memcpy( bi, old_bi, sizeof(BITMAPINFO) );
- // release old header
- delete old_bi;
- }
- // get bitmap info header
- BITMAPINFOHEADER& bih = bi->bmiHeader;
- // get color table (for 256 color mode contains 256 entries of RGBQUAD(=DWORD))
- LPDWORD clr_tbl = (LPDWORD)&bi->bmiColors;
- // fill bits buffer
- res = GetDIBits( dc, hBmp, 0, bih.biHeight, pBits, bi, DIB_RGB_COLORS );
- DeleteDC( dc );
- BITMAP bm;
- ::GetObject( hBmp, sizeof(BITMAP), &bm );
- // shift bits and byte per pixel (for comparing colors)
- LPBYTE pClr = (LPBYTE)&color;
- // swap red and blue components
- BYTE tmp = pClr[0]; pClr[0] = pClr[2]; pClr[2] = tmp;
- // convert color if curent DC is 16-bit (5:6:5) or 15-bit (5:5:5)
- if ( bih.biBitCount == 16 )
- {
- // for 16 bit
- color = ((DWORD)(pClr[0] & 0xf8) >> 3) |
- ((DWORD)(pClr[1] & 0xfc) << 3) |
- ((DWORD)(pClr[2] & 0xf8) << 8);
- // for 15 bit
- // color = ((DWORD)(pClr[0] & 0xf8) >> 3) |
- // ((DWORD)(pClr[1] & 0xf8) << 2) |
- // ((DWORD)(pClr[2] & 0xf8) << 7);
- }
- const DWORD RGNDATAHEADER_SIZE = sizeof(RGNDATAHEADER);
- const DWORD ADD_RECTS_COUNT = 40; // number of rects to be appended
- // to region data buffer
- // BitPerPixel
- BYTE Bpp = bih.biBitCount >> 3; // bytes per pixel
- // bytes per line in pBits is DWORD aligned and bmp.bmWidthBytes is WORD aligned
- // so, both of them not
- DWORD m_dwAlignedWidthBytes = (bmp.bmWidthBytes & ~0x3) + (!!(bmp.bmWidthBytes & 0x3) << 2);
- // DIB image is flipped that's why we scan it from the last line
- LPBYTE pColor = pBits + (bih.biHeight - 1) * m_dwAlignedWidthBytes;
- DWORD dwLineBackLen = m_dwAlignedWidthBytes + bih.biWidth * Bpp; // offset of previous scan line
- // (after processing of current)
- DWORD dwRectsCount = bih.biHeight; // number of rects in allocated buffer
- INT i, j; // current position in mask image
- INT first = 0; // left position of current scan line
- // where mask was found
- bool wasfirst = false; // set when mask has been found in current scan line
- bool ismask; // set when current color is mask color
- // allocate memory for region data
- // region data here is set of regions that are rectangles with height 1 pixel (scan line)
- // that's why first allocation is <bm.biHeight> RECTs - number of scan lines in image
- RGNDATAHEADER* pRgnData =
- (RGNDATAHEADER*)new BYTE[ RGNDATAHEADER_SIZE + dwRectsCount * sizeof(RECT) ];
- // get pointer to RECT table
- LPRECT pRects = (LPRECT)((LPBYTE)pRgnData + RGNDATAHEADER_SIZE);
- // zero region data header memory (header part only)
- memset( pRgnData, 0, RGNDATAHEADER_SIZE + dwRectsCount * sizeof(RECT) );
- // fill it by default
- pRgnData->dwSize = RGNDATAHEADER_SIZE;
- pRgnData->iType = RDH_RECTANGLES;
- for ( i = 0; i < bih.biHeight; i++ )
- {
- for ( j = 0; j < bih.biWidth; j++ )
- {
- // get color
- switch ( bih.biBitCount )
- {
- case 8:
- ismask = (clr_tbl[ *pColor ] != color);
- break;
- case 16:
- ismask = (*(LPWORD)pColor != (WORD)color);
- break;
- case 24:
- ismask = ((*(LPDWORD)pColor & 0x00ffffff) != color);
- break;
- case 32:
- ismask = (*(LPDWORD)pColor != color);
- }
- // shift pointer to next color
- pColor += Bpp;
- // place part of scan line as RECT region if transparent color found after mask color or
- // mask color found at the end of mask image
- if ( wasfirst )
- {
- if ( !ismask )
- {
- // save current RECT
- pRects[ pRgnData->nCount++ ] = CRect( first, i, j, i + 1 );
- // if buffer full reallocate it with more room
- if ( pRgnData->nCount >= dwRectsCount )
- {
- dwRectsCount += ADD_RECTS_COUNT;
- // allocate new buffer
- LPBYTE pRgnDataNew = new BYTE[ RGNDATAHEADER_SIZE + dwRectsCount * sizeof(RECT) ];
- // copy current region data to it
- memcpy( pRgnDataNew, pRgnData, RGNDATAHEADER_SIZE + pRgnData->nCount * sizeof(RECT) );
- // delte old region data buffer
- delete pRgnData;
- // set pointer to new regiondata buffer to current
- pRgnData = (RGNDATAHEADER*)pRgnDataNew;
- // correct pointer to RECT table
- pRects = (LPRECT)((LPBYTE)pRgnData + RGNDATAHEADER_SIZE);
- }
- wasfirst = false;
- }
- }
- else if ( ismask ) // set wasfirst when mask is found
- {
- first = j;
- wasfirst = true;
- }
- }
- if ( wasfirst && ismask )
- {
- // save current RECT
- pRects[ pRgnData->nCount++ ] = CRect( first, i, j, i + 1 );
- // if buffer full reallocate it with more room
- if ( pRgnData->nCount >= dwRectsCount )
- {
- dwRectsCount += ADD_RECTS_COUNT;
- // allocate new buffer
- LPBYTE pRgnDataNew = new BYTE[ RGNDATAHEADER_SIZE + dwRectsCount * sizeof(RECT) ];
- // copy current region data to it
- memcpy( pRgnDataNew, pRgnData, RGNDATAHEADER_SIZE + pRgnData->nCount * sizeof(RECT) );
- // delte old region data buffer
- delete pRgnData;
- // set pointer to new regiondata buffer to current
- pRgnData = (RGNDATAHEADER*)pRgnDataNew;
- // correct pointer to RECT table
- pRects = (LPRECT)((LPBYTE)pRgnData + RGNDATAHEADER_SIZE);
- }
- wasfirst = false;
- }
- pColor -= dwLineBackLen;
- }
- // release image data
- delete pBits;
- delete bi;
- // create region
- HRGN hRgn = ExtCreateRegion( NULL, RGNDATAHEADER_SIZE + pRgnData->nCount * sizeof(RECT), (LPRGNDATA)pRgnData );
- // release region data
- delete pRgnData;
- return hRgn;
- }