Package icyllis.arc3d.sketch

Class ImageFilter

java.lang.Object
icyllis.arc3d.sketch.ImageFilter
public class ImageFilter extends Object
Base class for image filters (sometimes known as image effects, or post-processing effects). If one is installed in the paint, then all drawing occurs as usual, but it is as if the drawing happened into an offscreen (before the transfer mode is applied). This offscreen bitmap will then be handed to the image filter, who in turn creates a new bitmap which is what will finally be drawn to the device (using the original transfer mode).

The local space of image filters matches the local space of the drawn geometry. For instance if there is rotation on the canvas, the blur will be computed along those rotated axes and not in the device space. In order to achieve this result, the actual drawing of the geometry may happen in an un-rotated coordinate system so that the filtered image can be computed more easily, and then it will be post transformed to match what would have been produced if the geometry were drawn with the total canvas matrix to begin with.

  • Constructor Details

    • ImageFilter

      public ImageFilter()

  • Method Details

    • canComputeFastBounds

      public boolean canComputeFastBounds()

    • computeFastBounds

      public void computeFastBounds(Rect2f src, Rect2f dst)