Creating Color Bitmap From Scratch

Environment:VC6

How do you create a color bitmap from scratch? You need to be able to make the bitmap without .bmp file or resource. Using CreateBitmap or CreateBitmapIndirect creates monochrome bitmaps, unless you have HDC that can handle color bitmaps. However, creating HDC by CreateCompatibleDC(NULL) gives you simple HDC that contains 1x1 monochrome bitmap. Following is the source code shows how to create color bitmap from scratch using CreateDIBSection:

HDC dc= CreateCompatibleDC(NULL);
BITMAPINFO i;
ZeroMemory( &i.bmiHeader, sizeof(BITMAPINFOHEADER) );
i.bmiHeader.biWidth=5;     // Set size you need
i.bmiHeader.biHeight=5;    // Set size you need
i.bmiHeader.biPlanes=1;
i.bmiHeader.biBitCount=24; // Can be 8, 16, 32 bpp or 
                           // other number
i.bmiHeader.biSizeImage=0;
i.bmiHeader.biSize=sizeof(BITMAPINFOHEADER);
i.bmiHeader.biClrUsed= 0;
i.bmiHeader.biClrImportant= 0;
VOID *pvBits;
HBITMAP hbmp= CreateDIBSection( dc,
                                &i,
                                DIB_RGB_COLORS,
                                &pvBits,
                                NULL,
                                0 );
// You don't have to use 'pvBits', later DeleteObject(hbmp)
// will free this bit array.


Comments

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Managing your company's financials is the backbone of your business and is vital to the long-term health and viability of your company. To continue applying the necessary financial rigor to support rapid growth, the accounting department needs the right tools to most efficiently do their job. Read this white paper to understand the 10 essentials of a complete financial management system and how the right solution can help you keep up with the rapidly changing business world.

  • Live Event Date: August 14, 2014 @ 2:00 p.m. ET / 11:00 a.m. PT Data protection has long been considered "overhead" by many organizations in the past, many chalking it up to an insurance policy or an extended warranty you may never use. The realities of today makes data protection a must-have, as we live in a data-driven society -- the digital assets we create, share, and collaborate with others on must be managed and protected for many purposes. Check out this upcoming eSeminar and join Seagate Cloud …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds