| DirectFB Interfaces | IDirectFB |
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| Reference Manual - 1.1.1 | ||
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IDirectFB is the main interface. It can be
retrieved by a call to DirectFBCreate. It's the only
interface with a global creation facility. Other interfaces
are created by this interface or interfaces created by it.
Hardware capabilities such as the amount of video
memory or a list of supported drawing/blitting functions and
flags can be retrieved. It also provides enumeration of all
supported video modes.
Input devices and display layers that are
present can be enumerated via a callback mechanism. The
callback is given the capabilities and the device or layer
ID. An interface to specific input devices or display layers
can be retrieved by passing the device or layer ID to the
corresponding method.
Surfaces for general purpose use can be created via
CreateSurface. These surfaces are so called "offscreen
surfaces" and could be used for sprites or icons.
The primary surface is an abstraction and API shortcut
for getting a surface for visual output. Fullscreen games for
example have the whole screen as their primary
surface. Alternatively fullscreen applications can be forced
to run in a window. The primary surface is also created via
CreateSurface but with the special capability
DSCAPS_PRIMARY.
The cooperative level selects the type of the primary
surface. With a call to SetCooperativeLevel the
application can choose between the surface of an implicitly
created window and the surface of the primary layer
(deactivating the window stack). The application doesn't need
to have any extra functionality to run in a window. If the
application is forced to run in a window the call to
SetCooperativeLevel fails with DFB_ACCESSDENIED.
Applications that want to be "window aware" shouldn't exit on
this error.
The video mode can be changed via SetVideoMode
and is the size and depth of the primary surface, i.e. the
screen when in exclusive cooperative level. Without exclusive
access SetVideoMode sets the size of the implicitly
created window.
Event buffers can be created with an option to
automatically attach input devices matching the specified
capabilities. If DICAPS_NONE is passed an event buffer with
nothing attached to is created. An event buffer can be
attached to input devices and windows.
Fonts, images and videos are created by this
interface. There are different implementations for different
content types. On creation a suitable implementation is
automatically chosen.
| Methods of IDirectFB | ||
|---|---|---|
| Cooperative level, video mode | SetCooperativeLevel | Puts the interface into the specified cooperative level. |
| SetVideoMode | Switch the current video mode (primary layer). | |
| Hardware capabilities | GetDeviceDescription | Get a description of the graphics device. |
| EnumVideoModes | Enumerate supported video modes. | |
| Surfaces & Palettes | CreateSurface | Create a surface matching the specified description. |
| CreatePalette | Create a palette matching the specified description. | |
| Screens | EnumScreens | Enumerate all existing screen. |
| GetScreen | Retrieve an interface to a specific screen. | |
| Display Layers | EnumDisplayLayers | Enumerate all existing display layers. |
| GetDisplayLayer | Retrieve an interface to a specific display layer. | |
| Input Devices | EnumInputDevices | Enumerate all existing input devices. |
| GetInputDevice | Retrieve an interface to a specific input device. | |
| CreateEventBuffer | Create a buffer for events. | |
| CreateInputEventBuffer | Create a buffer for events with input devices connected. | |
| Media | CreateImageProvider | Create an image provider for the specified file. |
| CreateVideoProvider | Create a video provider. | |
| CreateFont | Load a font from the specified file given a description of how to load the glyphs. | |
| CreateDataBuffer | Create a data buffer. | |
| Clipboard | SetClipboardData | Set clipboard content. |
| GetClipboardData | Get clipboard content. | |
| GetClipboardTimeStamp | Get time stamp of last SetClipboardData call. | |
| Misc | Suspend | Suspend DirectFB, no other calls to DirectFB are allowed until Resume has been called. |
| Resume | Resume DirectFB, only to be called after Suspend. | |
| WaitIdle | Wait until graphics card is idle, i.e. finish all drawing/blitting functions. | |
| WaitForSync | Wait for next vertical retrace. | |
| Extensions | GetInterface | Load an implementation of a specific interface type. |
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