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Capture an HTML document as an image

, , 19 May 2004
Capturing HTML documents as images
//----------------------------------------------------------------------------
// N O L D U S   I N F O R M A T I O N   T E C H N O L O G Y   B . V .
//----------------------------------------------------------------------------
// Filename:      BitmapDC.cpp
// Project:       EthoVision
// Module:        Visualization
// Programmer:    Anneke Sicherer-Roetman
// Version:       1.00
// Revision Date: 08-10-1999
//----------------------------------------------------------------------------
// Description:   Definition of class BitmapDC
//                See BitmapDC.h
//----------------------------------------------------------------------------
// Revision history:
// 08-10-1999 - First implementation
//----------------------------------------------------------------------------
// Bugs: ........
//----------------------------------------------------------------------------
// @doc
//----------------------------------------------------------------------------

#include "stdafx.h"
#include "BitmapDC.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

//----------------------------------------------------------------------------
// Function DrawBitmap
// @func    draws bitmap at specified point in specified device context
// @rdesc   nothing
// @parm    const CBitmap | *bitmap | bitmap to draw
// @parm    const CDC     | *pDC    | device context to draw in
// @parm    const CPoint  | &point  | top left point of bitmap
//----------------------------------------------------------------------------
// @prog 
// Anneke Sicherer-Roetman
// @revs 
// 06-10-1999 - First implementation
//----------------------------------------------------------------------------
// @todo 
//----------------------------------------------------------------------------
void DrawBitmap(const CBitmap *bitmap, const CDC *pDC, const CPoint &point)
{
  // determine bitmap size
  BITMAP bm; ((CBitmap*)bitmap)->GetBitmap(&bm);
  int w = bm.bmWidth; 
  int h = bm.bmHeight;

  // create memory device context
  CDC memDC; VERIFY(memDC.CreateCompatibleDC((CDC*)pDC));
  CBitmap *pBmp = memDC.SelectObject((CBitmap*)bitmap);
  memDC.SetMapMode(pDC->GetMapMode());

  // blit bitmap to specified device context
  ((CDC*)pDC)->BitBlt(point.x, point.y, w, h, &memDC, 0, 0, SRCCOPY);

  // clean up
  memDC.SelectObject(pBmp);
}

//----------------------------------------------------------------------------
// Function DrawBitmap
// @func    draws bitmap centered in specified rectangle in specified device context
// @rdesc   nothing
// @parm    const CBitmap | *bitmap | bitmap to draw
// @parm    const CDC     | *pDC    | device context to draw in
// @parm    const CRect   | &rect   | rectangle to center in
// @parm    bool          | stretch | stretch? (default false)
//----------------------------------------------------------------------------
// @prog 
// Anneke Sicherer-Roetman
// @revs 
// 06-10-1999 - First implementation
//----------------------------------------------------------------------------
// @todo 
//----------------------------------------------------------------------------
void DrawBitmap(const CBitmap *bitmap, const CDC *pDC, const CRect &rect, 
                bool stretch /* = false */)
{
  // determine bitmap size
  BITMAP bm; ((CBitmap*)bitmap)->GetBitmap(&bm);
  int w = bm.bmWidth; 
  int h = bm.bmHeight;

  if (stretch) {
    CPoint org(0, 0);
    CSize orgSize(w, h);
    // create memory device context
    CDC memDC; VERIFY(memDC.CreateCompatibleDC((CDC*)pDC));
    CBitmap *pBmp = memDC.SelectObject((CBitmap*)bitmap);
    memDC.SetMapMode(pDC->GetMapMode());
    // blit bitmap to specified device context with stretching
    ((CDC*)pDC)->SetStretchBltMode(HALFTONE);
    ((CDC*)pDC)->StretchBlt(rect.left, rect.top, rect.Width(), rect.Height(), &memDC, 
                            0, 0, w, h, SRCCOPY);
    // clean up
    memDC.SelectObject(pBmp);
  } else { // !stretch
    CPoint point;
    point.x = rect.left + ((rect.right - rect.left) / 2) - (w / 2);
    point.y = rect.top + ((rect.bottom - rect.top) / 2) - (h / 2);
    DrawBitmap(bitmap, pDC, point);
  }
}

//----------------------------------------------------------------------------
// Function CBitmapDC
// @func    constructor
// @parm    int   | width      | width of memory bitmap
// @parm    int   | height     | height of memory bitmap
// @parm    CDC   | *pOrigDC   | DC to make bitmap compatible with (default NULL = screen)
// @parm COLORREF | background | background color (default white)
//----------------------------------------------------------------------------
// @prog 
// Anneke Sicherer-Roetman
// @revs 
// 08-10-1999 - First implementation
//----------------------------------------------------------------------------
// @todo 
//----------------------------------------------------------------------------
//lint -save -e1732 -e1733 new in constructor and no assignment operator / copy constructor
CBitmapDC::	CBitmapDC(int width, int height, CDC *pOrigDC /* = NULL */, 
                      COLORREF background /* = RGB(255,255,255) */):
  CDC(),
    m_pBitmap(NULL),
    m_pOldBmp(NULL)
{
  // create new bitmap
  CWindowDC dc(NULL); // screen
  if (!pOrigDC)
    pOrigDC = &dc;
  m_pBitmap = new CBitmap();
  VERIFY(m_pBitmap->CreateCompatibleBitmap(pOrigDC, width, height)); 

  // make compatible device context and select bitmap into it
  VERIFY(CreateCompatibleDC(pOrigDC));
  m_pOldBmp = SelectObject(m_pBitmap);
  CDC::SetMapMode(pOrigDC->GetMapMode());

  // paint background in bitmap
  FillSolidRect(0, 0, width, height, background);
}
//lint -restore

//----------------------------------------------------------------------------
// Function CBitmapDC::~CBitmapDC
// @mfunc   destructor, destroys bitmap if it has not been released with <mf CBitmapDC::GetFinalBitmap>
// @xref    <c CBitmapDC>
//----------------------------------------------------------------------------
// @prog 
// Anneke Sicherer-Roetman
// @revs 
// 08-10-1999 - First implementation
//----------------------------------------------------------------------------
// @todo 
//----------------------------------------------------------------------------
//lint -save -e1740 pointer member not directly freed or zero'ed by destructor
CBitmapDC::~CBitmapDC()
{
  if (m_pBitmap) {
    CBitmap *pBitmap;
    pBitmap = Close();
    delete pBitmap;
    pBitmap = NULL;
  }
}
//lint -restore

//----------------------------------------------------------------------------
// Function CBitmapDC::Close
// @mfunc   returns pointer to memory bitmap and prevents further use <nl>
//          NOTE: The programmer is now responsible for deleting this bitmap
// @rdesc   pointer to memory bitmap (CBitmap*) (to be deleted by caller)
// @xref    <c CBitmapDC>
//----------------------------------------------------------------------------
// @prog 
// Anneke Sicherer-Roetman
// @revs 
// 08-10-1999 - First implementation
//----------------------------------------------------------------------------
// @todo 
//----------------------------------------------------------------------------
CBitmap *CBitmapDC::Close()
{
  ASSERT(m_pBitmap);
  CBitmap *pBitmap = m_pBitmap;
  SelectObject(m_pOldBmp);
  m_pBitmap = NULL;
  return pBitmap;
}

//----------------------------------------------------------------------------

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About the Authors

Rob Manderson

United States United States
I've been programming for 35 years - started in machine language on the National Semiconductor SC/MP chip, moved via the 8080 to the Z80 - graduated through HP Rocky Mountain Basic and HPL - then to C and C++ and now C#.
 
I used (30 or so years ago when I worked for Hewlett Packard) to repair HP Oscilloscopes and Spectrum Analysers - for a while there I was the one repairing DC to daylight SpecAns in the Asia Pacific area.
 
Afterward I was the fourth team member added to the Australia Post EPOS project at Unisys Australia. We grew to become an A$400 million project. I wrote a few device drivers for the project under Microsoft OS/2 v 1.3 - did hardware qualification and was part of the rollout team dealing directly with the customer.
 
Born and bred in Melbourne Australia, now living in Scottsdale Arizona USA, became a US Citizen on September 29th, 2006.
 
I work for a medical insurance broker, learning how to create ASP.NET websites in VB.Net and C#. It's all good.
 
Oh, I'm also a Kentucky Colonel. http://www.kycolonels.org

Vadim Tabakman
Web Developer
United States United States
C/C++ Programmer. OS of choice is any Win32 OS. Started working in the gaming industry, programming mainframe VOS OS and dealing with Slot machine serials comms protocols, creating test-tools and line monitoring software on W2K.
 
Moved on to working in a small software company that worked with electronic forms. Glad I spent most of my time there learning new technologies and increasing my programming skills. I wasn't going to learning anything from anyone there. Well, except the odd one person who is now a CPian.
 
Now working in a company that works with Security, Identity and Trust Solutions. Learning lots about encryption, signing, digital signatures, hashing and all sorts of new buzz words. It might as well be another language.

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Web01 | 2.8.140709.1 | Last Updated 20 May 2004
Article Copyright 2004 by Rob Manderson, Vadim Tabakman
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