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From Mostafa Mahdieh <m.mahd...@gmail.com>
Subject Re: Text rendering of some Persian characters has issues when converting SVG to PNG
Date Wed, 26 Jun 2013 19:23:42 GMT
Any ideas?


On Mon, Jun 24, 2013 at 5:33 PM, Mostafa Mahdieh <m.mahdieh@gmail.com>wrote:

> Hi,
>
> I am using Activiti Explorer 5.12.1, which uses batik transcoder 1.7 as a
> library. When exporting bpmn models to png using Activiti Explorer, the
> output has issues on characters "ی", "ک", "پ" and "گ". Note that theses
> characters are part of the Persian character set of utf-8, and other
> characters which are in the common set of Arabic and Persian character
> sets, don't seem to have any problems.
>
> I have *attached* a sample of one of my tests. The text in the box should
> read
>
> "ما کب گپ جیب جوب پا"
>
> which is incorrectly shown as
>
> "ما ک‌ب گ‌پ ج‌ی‌ب جوب پ‌ا"
>
> I traced the problem in Activiti Explorer code to this small code snippet:
>
> =======================
>       InputStream svgStream = new
> ByteArrayInputStream(modelForm.getFirstValue("svg_xml").getBytes("utf-8"));
>       TranscoderInput input = new TranscoderInput(svgStream);
>
>       PNGTranscoder transcoder = new PNGTranscoder();
>       // Setup output
>       ByteArrayOutputStream outStream = new ByteArrayOutputStream();
>       TranscoderOutput output = new TranscoderOutput(outStream);
>
>       // Do the transformation
>       transcoder.transcode(input, output);
>       final byte[] result = outStream.toByteArray();
> =======================
>
> It seems that the issues are coming from the PNGTranscoder not being able
> to render persian text correctly. PNGTranscoder is part of Apache Batik
> (org.apache.batik.transcoder.image.PNGTranscoder).
>
> I have also created a very small eclipse project which does the same
> thing, independent of any Activiti Explorer code, which helps a lot to
> debug the problem. The project is attached.
>
> More details:
>
> OS: Ubuntu Linux 12.04 (3.2.0-44-generic #69-Ubuntu SMP Thu May 16
> 17:35:01 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux)
>
> Java: java version "1.7.0_21"
> OpenJDK Runtime Environment (IcedTea 2.3.9) (7u21-2.3.9-0ubuntu0.12.04.1)
>
> Batik version used by Activiti Explorer (found in the MANIFEST.MF of the
> jar file included): 1.7+r608262
>
> Regards
> --
> Mostafa Mahdieh
>



-- 
Mostafa Mahdieh

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