GDI Support Services
The GDI provides some services to support display drivers as predefined structures. The structures interact both with associated functions and with a few stand-alone C functions. Predefined structures support brushes, palettes, translations, clipping regions, and stroke and fill paths. Stand-alone C functions support device bitmaps and surfaces. The following table shows the structures and functions.
| Structure or function | Description |
|---|---|
| BRUSHOBJ | Represents a brush that is used for solid or patterned stroke and fill operations. |
| BRUSHOBJ_pvAllocRbrush | Allocates memory for a brush. |
| BRUSHOBJ_pvGetRbrush | Retrieves a pointer to the specified brush. |
| CLIPOBJ | Represents a clipping region. |
| CLIPOBJ_bEnum | Enumerates clipping rectangles from a clipping region. |
| CLIPOBJ_cEnumStart | Sets parameters for enumerating the rectangles in a clipping region. |
| EngCreateDeviceBitmap | Causes the GDI to create a handle for a device bitmap file. |
| EngCreateDeviceSurface | Causes the GDI to create a device surface that the display driver manages. |
| EngDeleteSurface | Informs the GDI that the display driver no longer needs a device surface. |
| PALOBJ_cGetColors | Copies colors to a palette. |
| PATHDATA | Stores portions of a drawing path. |
| PATHOBJ_bEnum | Enumerates PATHDATA records from a drawing path. |
| PATHOBJ_vEnumStart | Prepares a drawing path to have its component line segments enumerated. |
| PATHOBJ_vGetBounds | Returns the bounding rectangle for a drawing path. |
| XLATEOBJ | Translates colors from one palette to another. |
| XLATEOBJ_cGetPalette | Retrieves colors from an indexed palette. |
See Also
Display Drivers | Display Driver Extensions | Display Driver Samples | Primary Display Drivers | Secondary Display Drivers | DDI Functions | BitBlT Emulation Library Functions | GPE Base Classes | Display Buffer Formats | Line Drawing | Display Driver Escape Codes | Display Drivers and the OS Image
Last updated on Tuesday, May 18, 2004
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