A static control to display DIBs

This article describes a class (CDibStatic) that implements a static control used to display dibs. The control has a CDib member, which displays itself with the parameters passed by the CDibStatic class. The CDib class encapsulates the functionality provided in dibapi.h (DIBLOOK sample) and is described in an article in the images & palettes section.

The main features of the CDibStatic class are:

  • The dib can be loaded directly from disk
  • Includes palette support
  • The image is centered/stretched automatically in the control client area

The palette support is implemented using handlers for the WM_QUERYNEWPALETTE and WM_PALETTECHANGED windows messages, so you have to ensure in your program that the control receives these messages. If the palette never changes the CDib class paints the image with the right palette selected the first time. If the control is used in modal dialogs (fileopen for instance), the palette changes can be due only to other applications, thus realizing palette when gaining focus will always maintain the right colors. You can realize the palette any time you want using the DoRealizePalette member function.

This class has been used (among other things) to implement a standard file open dialog with preview (and without any custom hooks) and a completely object oriented DIBLOOK. These articles can be found on the dialogs section and the samples section respectively.

Downloads

Download demo project - 40 Kb
Download source - 8 Kb


Comments

  • Bug, width and height are exchanged

    Posted by Legacy on 08/15/2000 12:00am

    Originally posted by: Albert L Faber

    I noticed a small bug in the CDibStatic class, the problem occursonly when the DIB size is smaller than the Client paint area:

    When I replaced the following two lines (in CDIBStatic::PaintDib method) it
    seems to work correct

    replace:
    nDestWidth = m_DIB.Height();
    nDestHeight = m_DIB.Width();

    with:

    nDestHeight = m_DIB.Height();
    nDestWidth = m_DIB.Width();


    Apprently the Width and the Height are mixed up

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  • Your email address will not be published.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

Top White Papers and Webcasts

  • "Security" is the number one issue holding business leaders back from the cloud. But does the reality match the perception? Keeping data close to home, on premises, makes business and IT leaders feel inherently more secure. But the truth is, cloud solutions can offer companies real, tangible security advantages. Before you assume that on-site is the only way to keep data safe, it's worth taking a comprehensive approach to evaluating risks. Doing so can lead to big benefits.

  • Hybrid cloud platforms need to think in terms of sweet spots when it comes to application platform interface (API) integration. Cloud Velocity has taken a unique approach to tight integration with the API sweet spot; enough to support the agility of physical and virtual apps, including multi-tier environments and databases, while reducing capital and operating costs. Read this case study to learn how a global-level Fortune 1000 company was able to deploy an entire 6+ TB Oracle eCommerce stack in Amazon Web …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds