Consecutive Convolutions

[Ed .]

Do you mean, like so?

        QUndoStack stack;

        KisTransaction *t1 = new KisTransaction("", interm);
        KisConvolutionPainter horizPainter(interm, dstInfo.selection());
        horizPainter.applyMatrix(kernelHoriz, src, srcTopLeft, srcTopLeft, size, BORDER_REPEAT);
        stack.push(t1);

        KisTransaction *t2 = new KisTransaction("", dst);
        KisConvolutionPainter verticalPainter(dst, dstInfo.selection());
        verticalPainter.applyMatrix(kernelVertical, interm, srcTopLeft, dstTopLeft, size, BORDER_REPEAT);
        stack.push(t2);

This had no effect whatsoever.

Date: Tue, 22 Dec 2009 17:05:21 +0300
Subject: Re: Consecutive Convolutions
From: dimula73 at gmail.com
To: kimageshop at kde.org

Could you try to create transactions for both devices? Directly or using KisPainter's method. Filters rely on oldData feature but this do not work without a transaction created.

On Tue, Dec 22, 2009 at 4:57 PM, Ed . <schumifer at hotmail.com> wrote:






Hi,

I am performing two consecutive convolution operations, one after each other in a filter (the Gaussian Blur filter in the review board). Of course, I need a temporary buffer to do this. Below is what I'm doing.


  KisPaintDeviceSP interm = new KisPaintDevice(*src);

  KisConvolutionPainter horizPainter(interm, dstInfo.selection());
  horizPainter.applyMatrix(kernelHoriz, src, srcTopLeft, srcTopLeft, size, BORDER_REPEAT);


  KisConvolutionPainter verticalPainter(dst, dstInfo.selection());
  verticalPainter.applyMatrix(kernelVertical, interm, srcTopLeft, dstTopLeft, size, BORDER_REPEAT);

The output I'm getting when I apply the rasterizing filter, is the result of the second convolution only. However, if I apply the filter as a filter layer, I get the combined result of both convolutions.


As boud suggested on IRC, I switched Krita to the old tile engine, and the results are correct in both cases. Therefore, the indication is that this is a problem with the new tile engine. Could anyone investigate further?

 		 	   		  
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