Thread: DrawDIB Problem

  1. #1

    DrawDIB Problem

    hello friends

    I am using DrawDIB to draw a Bitmap. If the size of the Bitmap increases. The scrolls become very slow. If the size oif the map is small then horizontal and vertical scrolling works fine. How can i load a large bitmap without effecting the scrolls.

  2. #2
    train spotter
    Join Date
    Aug 2001
    near a computer
    Try experimenting with these;

    How are you drawing the image to the screen? BitBlt() or StretchBlt()

    Using a screen buffer (double buffer) system?

    Trying to scroll and draw to the screen at the same time, small increment at a time?

    Or calculating the WHOLE scroll distance then doing the drawing?

    Handling WM_ERASEBKGND msg's?

    Using InvalidateRect() with the bErase set to TRUE?

    Using GetUpdateRect() before your call to BeginPaint() to reduce the area draw?
    "Man alone suffers so excruciatingly in the world that he was compelled to invent laughter."
    Friedrich Nietzsche

    "I spent a lot of my money on booze, birds and fast cars......the rest I squandered."
    George Best

    "If you are going through hell....keep going."
    Winston Churchill

Popular pages Recent additions subscribe to a feed

Similar Threads

  1. Memory problem with Borland C 3.1
    By AZ1699 in forum C Programming
    Replies: 16
    Last Post: 11-16-2007, 11:22 AM
  2. Someone having same problem with Code Block?
    By ofayto in forum C++ Programming
    Replies: 1
    Last Post: 07-12-2007, 08:38 AM
  3. A question related to strcmp
    By meili100 in forum C++ Programming
    Replies: 6
    Last Post: 07-07-2007, 02:51 PM
  4. WS_POPUP, continuation of old problem
    By blurrymadness in forum Windows Programming
    Replies: 1
    Last Post: 04-20-2007, 06:54 PM
  5. beginner problem
    By The_Nymph in forum C Programming
    Replies: 4
    Last Post: 03-05-2002, 05:46 PM