mybitmap.cpp

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// 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;
}