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PdCreateOffscreenContext()

Create an offscreen context

Synopsis:

PdOffscreenContext_t *PdCreateOffscreenContext(
                         unsigned long ImageType,
                         unsigned short width,
                         unsigned short height,
                         unsigned long flags );

Arguments:

ImageType
The type of image. Can be one of:

For more information about these image types, see PhImage_t.

width, height
The dimensions of the context, in pixels.
flags
Flags that indicate how you want to create the offscreen context. Set to 0 if there are no restrictions on where the context can be allocated. Can be a combination of:

Library:

ph

Description:

This function creates an offscreen context.


Note: You must target this function at a specific card by calling PdSetTargetDevice(). PdCreateOffscreenContext() blocks until the operation is complete.

If there isn't enough space in video RAM to create the offscreen context, the behavior of this function depends on the driver; most drivers allocate space in system memory instead (if none of SYS_ONLY, 2D_WRITABLE, or 2D_READABLE are set in flags).

Returns:

A pointer to a PdOffscreenContext_t, or NULL if an error occurred.

Classification:

Photon

Safety:
Interrupt handler No
Signal handler No
Thread No

See also:

PdDupOffscreenContext(), PdGetOffscreenContextPtr(), PdOffscreenContext_t, PdSetOffscreenTranslation(), PdSetTargetDevice(), PgContextBlit(), PgSwapDisplay(), PhDCCreate(), PhDCRelease()

Video memory offscreen in the Raw Drawing and Animation chapter of the Photon Programmer's Guide


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