QPx_FilterPicture

QPx_FilterPicture(pictVar; pictVar):error
	pictVar	Picture	Picture variable
	filterSettings	BLOB	Filter settings
	error	Longint	Error result

The source picture is passed in the pictVar parameter. The source picture may be compressed or uncompressed. The filtered picture is also returned in the pictVar parameter and it is always uncompressed. If an error occurs, pictVar is set to an empty picture.

The filterSettings parameter specifies the filter to be applied and its associated settings. To let the user select a filter and retrieve the selected filter and settings, call the QPx_DoFilterSettingsDialog command.

To get all available QuickTime filters, call the QPx_GetFilterList command.

NOTE The BLOB parameter must contain filter settings that has previously been obtained using QPx_DoFilterSettingsDialog. The structure of this BLOB is private to QuickTime and cannot be constructed or altered with 4D BLOB commands. To fiddle with the settings BLOB at your own risk, use the plug-in QTAtoms.bundle that is included in the QPix distribution package.

Example

   // Displays the filter settings dialog and applies 
   // the selected filter to a picture

C_LONGINT($error)
C_PICTURE($picture)
C_TEXT($filterType)
C_BLOB($settings)

$picture:=[Images]Picture

$error:=QPx_DoFilterSettingsDialog ($settings;$filterType)

If ($error=qpx_noErr)
   
   $error:=QPx_FilterPicture ($picture;$settings)
   
   If ($error#qpx_noErr)
      
         // Handle the error
      
   End if 
   
End if 

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