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DirectX Runtime Behavior

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Various versions of the Microsoft DirectX runtime handle the following rotation situations on behalf of the driver:

  • The Microsoft DirectDraw runtime automatically fails any attempt to display an overlay while the display is rotated.

  • All versions of the DirectX runtime adjust the scan-line values that are returned while the primary surface is rotated so that the scan-line values cover the entire range up to the height of the resolution. Otherwise, an application that attempts beam chasing might stop responding if it waits for a scan-line value that is greater than the width of the display and that the application would otherwise never receive while in portrait mode.

  • All versions of the DirectX runtime handle all accesses to a rotated primary surface that are made by a windowed-mode device that uses various forms of emulation.