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AR# 53619

LogiCORE IP Video On Screen Display (OSD) - Why does the background change to another color when a GPU layer is enabled?


Why does the background change to another color when a GPU layer is enabled?

For example, why does the background change from black to grey when the GPU layer is enabled?


This can happen for a number of reasons.
  • Make sure that the global alpha enable bit for the graphics layer is disabled, which is bit 1 of address 0x110, 0x120, 0x130, etc.
    It should not be set if that layer is a graphics controller.
  • The first entry in the color table should always be 0x00000000. 
    This ensures that the background of the graphics layer has an alpha value of 0x00 and should not blend.
Please see (Xilinx Answer 33257) for a detailed list of LogiCORE IP Video On Screen Display Release Notes and Known Issues.

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AR# 53619
Date 08/26/2014
Status Archive
Type General Article
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