0 Replies Latest reply on Sep 10, 2009 4:52 PM by Jason Szeto

    [svn:fx-trunk] 10138: Adding alpha to BitmapFill

    Jason Szeto Level 3

      Revision: 10138

      Author:   jszeto@adobe.com

      Date:     2009-09-10 16:51:52 -0700 (Thu, 10 Sep 2009)


      Log Message:


      Adding alpha to BitmapFill


      http://bugs.adobe.com/jira/browse/SDK-22932 - Border's backgroundAlpha style has no effect when backgroundImage is set


      I have added an alpha property to BitmapFill. Since graphics.beginBitmapFill doesn?\226?\128?\153t have an alpha parameter, I have to clone the bitmapData source and apply to it a colorTransform (which contains the alphaMultipler).


      If the source image doesn't support an alpha channel (ex. JPEG), then I need to copy the source into a new bitmapData object that supports transparency. This occurs one time in the source setter.


      If the alpha or source has changed, then I need to copy the source into a new bitmapData. The reason is that using the BitmapData.colorTransform function is cumulative. Once I've applied an alphaMultiplier to it, there is no way to restore the alpha. I've optimized the code a bit to only copy the bitmapData if needed. For example, if we have already copied the data to add the transparent pixel border (to prevent the streaking effect on a non-repeating fill), then we forgo the copying.


      QE notes: Need new tests for this property

      Doc notes: Need docs for this property

      Bugs: SDK-22932

      Reviewer: Ryan

      Tests run: checkintests

      Is noteworthy for integration: Yes


      Ticket Links:





      Modified Paths: