Starboard Module Reference: window.h

Provides functionality to handle Window creation and management.



Well-defined value for an invalid window handle.



A handle to a window.


typedef SbWindowPrivate* SbWindow



Options that can be requested at window creation time.


  • SbWindowSize size

    The requested size of the new window. The value of video_pixel_ratio will not be used or looked at.

  • bool windowed

    Whether the new window should be windowed or not. If not, the requested size is really the requested resolution.

  • const char * name

    The name of the window to create.


The size of a window in graphics rendering coordinates. The width and height of a window should correspond to the size of the graphics surface used for drawing that would be created to back that window.


  • int width

    The width of the window in graphics pixels.

  • int height

    The height of the window in graphics pixels.

  • float video_pixel_ratio

    The ratio of video pixels to graphics pixels. This ratio must be applied equally to width and height, meaning the aspect ratio is maintained.

    A value of 1.0f means the video resolution is the same as the graphics resolution. This is the most common case.

    Values greater than 1.0f mean that the video resolution is higher (denser, larger) than the graphics resolution. This is a common case as devices often have more video decoding capabilities than graphics rendering capabilities (or memory, etc...).

    Values less than 1.0f mean that the maximum video resolution is smaller than the graphics resolution.

    A value of 0.0f means the ratio could not be determined, it should be assumed to be the same as the graphics resolution (i.e. 1.0f).



Creates and returns a new system window with the given options, which may be NULL. The function returns kSbWindowInvalid if it cannot create the requested SbWindow due to policy, unsatisfiable options, or any other reason.

If options are not specified, this function uses all defaults, which must work on every platform. In general, it defaults to creating a fullscreen window at the highest 16:9 resolution possible. If the platform does not support fullscreen windows, then it creates a normal, windowed window.

Some devices are fullscreen-only, including many production targets for Starboard. In those cases, only one SbWindow may be created, and it must be fullscreen. Additionally, in those cases, the requested size will actually be the requested resolution.

An SbWindow must be created to receive window-based events, like input events, even on fullscreen-only devices. These events are dispatched to the Starboard entry point.

options: Options that specify parameters for the window being created.


SbWindow SbWindowCreate(const SbWindowOptions *options)


Destroys window, reclaiming associated resources.

window: The SbWindow to destroy.


bool SbWindowDestroy(SbWindow window)


Gets the size of the diagonal between two opposing screen corners.

A return value of 0 means that starboard does not know what the screen diagonal is.


float SbWindowGetDiagonalSizeInInches(SbWindow window)


Gets the platform-specific handle for window, which can be passed as an EGLNativeWindowType to initialize EGL/GLES. This return value is entirely platform-specific, so there are no constraints about expected ranges.

window: The SbWindow to retrieve the platform handle for.


void* SbWindowGetPlatformHandle(SbWindow window)


Retrieves the dimensions of window and sets size accordingly. This function returns true if it completes successfully. If the function returns false, then size will not have been modified.

window: The SbWindow to retrieve the size of. size: The retrieved size.


bool SbWindowGetSize(SbWindow window, SbWindowSize *size)


Returns whether the given window handle is valid.


static bool SbWindowIsValid(SbWindow window)


Sets the default options for system windows.

options: The option values to use as default values. This object must not be NULL.


void SbWindowSetDefaultOptions(SbWindowOptions *options)