Visual Artifacts, [GDI]

This is a discussion on Visual Artifacts, [GDI] within the Windows Programming forums, part of the Platform Specific Boards category; Hi, when blitting things to the screen in rapid succession you get visual artifacts (i.e. tearing). In DirectX I would ...

  1. #1
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    Visual Artifacts, [GDI]

    Hi, when blitting things to the screen in rapid succession you get visual artifacts (i.e. tearing). In DirectX I would just use a back buffer and flip during vertical blank intervals to remedy this. Well using only GDI here is what I'm thinking. Can I just create 2 DC's and use one as a 'back buffer' type deal and blit from that one to the main one when I want to draw my current frame? Anyone deal with this, or have a better way?

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    If you know how to handle it in direct x, why not simpily use direct x? The win api wasn't meant for high end graphical applications. That is why Direct X was concieved....

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    Originally posted by Zoalord
    That is why Direct X was concieved....
    True, but DirectX windowed (ie: not fullscreen) can be a pain sometimes.

    I normally do one of two things:

    1) Use FillRect to blt a solid color (usually black) onto the DC before you blt your sprites.

    2) Use another sprite that covers your entire background area and blt it before you blt your other sprites.

  4. #4
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    >>Can I just create 2 DC's and use one as a 'back buffer' type deal and blit from that one to the main one when I want to draw my current frame?

    Yes. Thats what I do.

    Works a treat, remember to FillRect() (or similar) with a solid background, inbetween drawings, in case to user changes the size of the window ect.
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    The reason I can't use DirectX is because the program is for a graphics class. If I could use DirectX I would not need to scan convert polygons. Granted I can scan convert them in GDI but one of the requirements is no use of external library except GDI. Thanks for the help I will try the 2 DC's approach.

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