SOL9 2.0 Class: DIBitmapFile

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Source code

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 * Copyright (c) 1999-2008 Antillia.com TOSHIYUKI ARAI. ALL RIGHTS RESERVED.
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 * modification, are permitted provided that the following conditions
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 *    derived from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 *
 *  DIBitmapFile.h
 *
 *****************************************************************************/

// SOL++2000
#pragma once

#include <sol\BitmapFile.h>

#include <sol\DIBitmap.h>


typedef HANDLE HDIB;

namespace SOL {

#define MAX 32000

class DIBitmapFile :public BitmapFile {
public:
  
  DIBitmapFile() { }

public:
  ~DIBitmapFile() { }

public:

  DIBitmap* extract()
  {
    char* buffer = new char[MAX]; 
    read(0L, buffer, MAX);
    if(strncmp(buffer, "BM", 2) != 0) return NULL;

    DWORD size  = fileLength() - sizeof(BITMAPFILEHEADER);

    int  n = sizeof(BITMAPFILEHEADER);

    BITMAPINFOHEADER* bi = (BITMAPINFOHEADER*)&buffer[n];
    int colorCount = getColorCount(bi);
    
    if (bi->biSize == sizeof(BITMAPCOREHEADER)){
      ::MessageBox(NULL, _T("This version does not support this type of format."), 
        _T("class DIBitmapFile"), MB_OK);
      delete [] buffer;
      return NULL;
    }

    HDIB hdib = (HDIB)::GlobalAlloc(GMEM_MOVEABLE | GMEM_ZEROINIT, size);
    if (hdib == 0) {
      delete [] buffer;
      return NULL;
    }

    char* bits = (char*)::GlobalLock(hdib);
    char* ptr  = bits;
    unsigned long offset = sizeof(BITMAPFILEHEADER);

    while(size > MAX) {
      read(offset, ptr, MAX);
      ptr    += MAX;
      offset += MAX;
      size   -= MAX;
    }
    read(offset, ptr, (WORD)size);

    ::GlobalUnlock(hdib);

    delete [] buffer;
    DIBitmap* dibitmap = new DIBitmap(_T(""), hdib, 
      bi->biWidth, bi->biHeight, colorCount);
    return dibitmap;
  }


};

}



Last modified: 5 May 2019

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