Smoother rendering via rendering hints #112
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In the signture panel when the pdf document and the signature preview is rendered, we add antialiasing and bicubic interpolation, so the scaled images dont look jagged and much smoother. I also added constant for a magic value that was used to upscale the signature preview image.
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Hey @iaik-jheher, I saw that you merged #111 today, I fixed the resulting merge conflicts and now it should be good again. |
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Rebase/force push is fine, but not required, we'll squash merge eventually anyway. |
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Just so I don't leave you hanging indefinitely without update: this is very much still on my radar, but we've run into some internal concerns about (re-)licensability of external contributions, which is what's blocking me from reviewing this right now. I'll let you know once I know more. |
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In the signture panel where the pdf page and the signature preview is painted, I added antialiasing and bicubic interpolation rendering hints so the scaled images don't look as jagged and much smoother. Specifically I added bicubic filtering, anti aliasing and setting the preferred rendering to the quality setting. I also added a constant for the magic value that was used to downscale the signature preview image in
SignaturePanel.setSignaturePlaceholder(...). It was used because when we request a signature preview fromPdfAs.generateVisibleSignaturePreview(...)we upscaled the resolution by that factor. I guess downscaling to get better image quality was already an idea. I reduced the scaling from 4 to 2 because this seemed to give nicer results.I tested that it compiles with
mvn -U install.In the future I might add a setting to modify the filtering settings, because somebody out there might be running this on weak hardware and prefers speed over looks.
I included two screenshots of the difference in rendering so one can easily compare them, I think it looks better ;)
