Conditionally Required Display Driver Functions
Depending on how a driver is implemented and on the features of the underlying adapter, other graphics DDI functions may be required. For example, if a driver manages its own surface (using EngCreateDeviceSurface to get a handle to the surface), that driver must also, at a minimum, support the following drawing functions:
| Function | Description |
|---|---|
Translates between device-managed raster surfaces and GDI standard-format bitmaps. |
|
Draws a path (curve or line) when called by GDI. |
|
Renders a set of glyphs at specified positions. |
Note Driver calls are serialized for any given surface.
Drivers that write to standard-format DIBs usually allow GDI to manage most or all of these operations. Displays that support settable palettes must support the DrvSetPalette function.
| Function | Description |
|---|---|
Requests that the driver realize the palette for a specified device. The driver sets the hardware palette to match the entries in the given palette as closely as possible. |
A list of conditionally required functions for all graphics drivers appears in Conditionally Required Graphics Driver Functions.
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