// MaskedBitmap.cpp: implementation of the CMaskedBitmap class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "MaskedBitmap.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
void CMaskedBitmap::Draw(CDC *pDC, int x, int y)
{
BITMAP bm;
GetBitmap (&bm);
CPoint size (bm.bmWidth, bm.bmHeight);
pDC->DPtoLP (&size);
CPoint org (0, 0);
pDC->DPtoLP (&org);
CDC dcMem;
dcMem.CreateCompatibleDC (pDC);
CBitmap* pOldBitmap = dcMem.SelectObject (this);
dcMem.SetMapMode (pDC->GetMapMode ());
pDC->BitBlt (x, y, size.x, size.y, &dcMem, org.x, org.y, SRCCOPY);
dcMem.SelectObject (pOldBitmap);
}
void CMaskedBitmap::DrawTransparent(CDC *pDC, int x, int y, COLORREF clrTransparency)
{
BITMAP bm;
GetBitmap (&bm);
CPoint size (bm.bmWidth, bm.bmHeight);
pDC->DPtoLP (&size);
CPoint org (0, 0);
pDC->DPtoLP (&org);
//
// Create a memory DC (dcImage) and select the bitmap into it.
//
CDC dcImage;
dcImage.CreateCompatibleDC (pDC);
CBitmap* pOldBitmapImage = dcImage.SelectObject (this);
dcImage.SetMapMode (pDC->GetMapMode ());
//
// Create a second memory DC (dcAnd) and in it create an AND mask.
//
CDC dcAnd;
dcAnd.CreateCompatibleDC (pDC);
dcAnd.SetMapMode (pDC->GetMapMode ());
CBitmap bitmapAnd;
bitmapAnd.CreateBitmap (bm.bmWidth, bm.bmHeight, 1, 1, NULL);
CBitmap* pOldBitmapAnd = dcAnd.SelectObject (&bitmapAnd);
dcImage.SetBkColor (clrTransparency);
dcAnd.BitBlt (org.x, org.y, size.x, size.y, &dcImage, org.x, org.y,
SRCCOPY);
//
// Create a third memory DC (dcXor) and in it create an XOR mask.
//
CDC dcXor;
dcXor.CreateCompatibleDC (pDC);
dcXor.SetMapMode (pDC->GetMapMode ());
CBitmap bitmapXor;
bitmapXor.CreateCompatibleBitmap (&dcImage, bm.bmWidth, bm.bmHeight);
CBitmap* pOldBitmapXor = dcXor.SelectObject (&bitmapXor);
dcXor.BitBlt (org.x, org.y, size.x, size.y, &dcImage, org.x, org.y,
SRCCOPY);
dcXor.BitBlt (org.x, org.y, size.x, size.y, &dcAnd, org.x, org.y,
0x220326);
//
// Copy the pixels in the destination rectangle to a temporary
// memory DC (dcTemp).
//
CDC dcTemp;
dcTemp.CreateCompatibleDC (pDC);
dcTemp.SetMapMode (pDC->GetMapMode ());
CBitmap bitmapTemp;
bitmapTemp.CreateCompatibleBitmap (&dcImage, bm.bmWidth, bm.bmHeight);
CBitmap* pOldBitmapTemp = dcTemp.SelectObject (&bitmapTemp);
dcTemp.BitBlt (org.x, org.y, size.x, size.y, pDC, x, y, SRCCOPY);
//
// Generate the final image by applying the AND and XOR masks to
// the image in the temporary memory DC.
//
dcTemp.BitBlt (org.x, org.y, size.x, size.y, &dcAnd, org.x, org.y,
SRCAND);
dcTemp.BitBlt (org.x, org.y, size.x, size.y, &dcXor, org.x, org.y,
SRCINVERT);
//
// Blit the resulting image to the screen.
//
pDC->BitBlt (x, y, size.x, size.y, &dcTemp, org.x, org.y, SRCCOPY);
//pDC->StretchBlt(x, y, cx, cy, &dcTemp, 0, 0, w, h, SRCCOPY);
//
// Restore the default bitmaps.
//
dcTemp.SelectObject (pOldBitmapTemp);
dcXor.SelectObject (pOldBitmapXor);
dcAnd.SelectObject (pOldBitmapAnd);
dcImage.SelectObject (pOldBitmapImage);
}