Package org.eclipse.swt.graphics

Interface ImageDataProvider

All Known Implementing Classes:
CompositeImageDescriptor.CachedImageDataProvider, Win32DPIUtils.AutoScaleImageDataProvider
public interface ImageDataProvider
Interface to provide a callback mechanism to get information about images when the application is moved from a low DPI monitor to a high DPI monitor. This provides API which will be called by SWT during the image rendering. This interface needs to be implemented by client code to provide the image information on demand.
Since:
3.104

  • Method Summary

    Modifier and Type
    Method
    Description
    ImageData
    getImageData(int zoom)
    Returns the image data for the given zoom level.

  • Method Details

    • getImageData

      ImageData getImageData(int zoom)
      Returns the image data for the given zoom level.
      • If no image is available for a particular zoom level, this method should return null. For zoom == 100, returning null is not allowed, and SWT will throw an exception.
      • Implementations are expected to return ImageData that is linearly scaled with respect to the zoom level. For example, if getImageData(100) returns an image of width w and height h, then getImageData(200) must return an ImageData of width 2 * w and height 2 * h, if a non-null result is returned.
      Parameters:
      zoom - The zoom level in % of the standard resolution (which is 1 physical monitor pixel == 1 SWT logical point). Typically 100, 150, or 200.
      Returns:
      the linearly scaled image data for the given zoom level, or null if zoom != 100 and no image is available for the given zoom level.
      Since:
      3.104