.. include:: common.txt
:mod:`pygame.Overlay`
=====================
.. currentmodule:: pygame
.. warning::
This module is non functional in pygame 2.0 and above, unless you have manually compiled pygame with SDL1.
This module will not be supported in the future.
.. class:: Overlay
| :sl:`pygame object for video overlay graphics`
| :sg:`Overlay(format, (width, height)) -> Overlay`
The Overlay objects provide support for accessing hardware video overlays.
Video overlays do not use standard ``RGB`` pixel formats, and can use
multiple resolutions of data to create a single image.
The Overlay objects represent lower level access to the display hardware. To
use the object you must understand the technical details of video overlays.
The Overlay format determines the type of pixel data used. Not all hardware
will support all types of overlay formats. Here is a list of available
format types:
::
YV12_OVERLAY, IYUV_OVERLAY, YUY2_OVERLAY, UYVY_OVERLAY, YVYU_OVERLAY
The width and height arguments control the size for the overlay image data.
The overlay image can be displayed at any size, not just the resolution of
the overlay.
The overlay objects are always visible, and always show above the regular
display contents.
.. method:: display
| :sl:`set the overlay pixel data`
| :sg:`display((y, u, v)) -> None`
| :sg:`display() -> None`
Display the YUV data in SDL's overlay planes. The y, u, and v arguments
are strings of binary data. The data must be in the correct format used
to create the Overlay.
If no argument is passed in, the Overlay will simply be redrawn with the
current data. This can be useful when the Overlay is not really hardware
accelerated.
The strings are not validated, and improperly sized strings could crash
the program.
.. ## Overlay.display ##
.. method:: set_location
| :sl:`control where the overlay is displayed`
| :sg:`set_location(rect) -> None`
Set the location for the overlay. The overlay will always be shown
relative to the main display Surface. This does not actually redraw the
overlay, it will be updated on the next call to ``Overlay.display()``.
.. ## Overlay.set_location ##
.. method:: get_hardware
| :sl:`test if the Overlay is hardware accelerated`
| :sg:`get_hardware(rect) -> int`
Returns a True value when the Overlay is hardware accelerated. If the
platform does not support acceleration, software rendering is used.
.. ## Overlay.get_hardware ##
.. ## pygame.Overlay ##
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