int c = hw_GetDisplayAttr(APTR handle, struct hwTagList *tags);

HWDISPATTR_RAWWIDTH:

This tag will return the display's raw width, i.e. the physical width of the display on the screen in pixels. The return value will be written to the pData member of this tag. You must set pData to an int pointer for this purpose.

HWDISPATTR_RAWHEIGHT:

This tag will return the display's raw height, i.e. the physical height of the display on the screen in pixels. The return value will be written to the pData member of this tag. You must set pData to an int pointer for this purpose.

HWDISPATTR_BUFFERWIDTH:

This tag will return the width of the display's back buffer. This can be different from HWDISPATTR_RAWWIDTH in case autoscaling is active. The return value will be written to the pData member of this tag. You must set pData to an int pointer for this purpose.

HWDISPATTR_BUFFERHEIGHT:

This tag will return the height of the display's back buffer. This can be different from HWDISPATTR_RAWHEIGHT in case autoscaling is active. The return value will be written to the pData member of this tag. You must set pData to an int pointer for this purpose.

HWDISPATTR_FLAGS:

This tag will return all flags that are set for this display. See OpenDisplay for a list of flags. The return value will be written to the pData member of this tag. You must set pData to an ULONG pointer for this purpose.

HWDISPATTR_SCALEWIDTH:

This tag will return the current scale width set for the display. Note that a value different than 0 here doesn't automatically mean that auto or layer scaling is active. You still need to check the respective flag to tell that scaling is active. The return value will be written to the pData member of this tag. You must set pData to an int pointer for this purpose.

HWDISPATTR_SCALEHEIGHT:

This tag will return the current scale height set for the display. Note that a value different than 0 here doesn't automatically mean that auto or layer scaling is active. You still need to check the respective flag to tell that scaling is active. The return value will be written to the pData member of this tag. You must set pData to an int pointer for this purpose.

HWDISPATTR_SCALEMODE:

This tag will return the current scale mode set for the display. Currently supported are 0 for hard scaling and 1 for interpolated scaling. The return value will be written to the pData member of this tag. You must set pData to an int pointer for this purpose.

HWDISPATTR_CANDROPFILE:

This tag will return a boolean value indicating whether or not the display supports dropping files on it. The return value will be either True or False and it will be written to the pData member of this tag. You must set pData to an int pointer for this purpose. (V7.0)

HWDISPATTR_USESATELLITE:

If the iData member of this tag is set to True, Hollywood will assume that the handle parameter passed to hw_GetDisplayAttr() is a display satellite handle allocated by hw_AttachDisplaySatellite() instead of a normal display handle. hw_GetDisplayAttr() will then query the specified attributes from the satellite's root display. This tag allows you to query attributes from a display through a display satellite handle. (V7.0)

HWDISPATTR_SCALEFACTOR:

This tag returns the current scale factor for the display. Note that display scale factors are not automatically enabled for all displays that use auto or layer scaling. They are only enabled when explicitly using the "ScaleFactor" tag or the "SystemScale" option in Hollywood. The pData member of this tag needs to be set to a pointer to a double which will receive the current display scale factor. (V8.0)

hw_GetDisplayAttr() returns the number of attributes successfully handled.

handle

handle to a display

tags

pointer to a taglist specifying the attributes to query

c

number of attributes successfully queried