Mateusz created BATIK-1288:
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Summary: PNG transcoder does not render PNG file correctly
Key: BATIK-1288
URL: https://issues.apache.org/jira/browse/BATIK-1288
Project: Batik
Issue Type: Bug
Affects Versions: 1.13
Environment: MacOS Catalina 10.15.4, MacOS Mojave, both visible on
MacBooks host systems as well as inside Virtual Machines
openjdk version "1.8.0_252"
OpenJDK Runtime Environment Corretto-8.252.09.1 (build 1.8.0_252-b09)
OpenJDK 64-Bit Server VM Corretto-8.252.09.1 (build 25.252-b09, mixed mode)
Reporter: Mateusz
Fix For: trunk
Attachments: SaveAsPNG.java, correct.png, incorrect_output_1.png,
incorrect_output_2.png, input.svg
Please consider such code I use for rendering PNG from SVG. We use it for
rendering various icon sizes. The majority of sizes are rendered as expected
(correct.png) but some are being rendered incorrect (especially 180 and 360).
That affects only some environments - on the majority of our MacBooks it works
fine for most trials and on VMs it usually results in incorrect PNG rendered as
below. Also, I didn't notice it happening for any other text strings that the
one from the sample (that obviously doesn't mean it is the only one causing
that).
May I ask you to check if that is something to be considered a batik bug? Or,
if not - please please point me any investigation directions in terms of my
code correctness, possible environment issues worth checking?
Thanks!
*Sample code:*
```
PNGTranscoder t = new PNGTranscoder()
{
@Override
protected ImageRenderer createRenderer()
{
ImageRenderer r = super.createRenderer();
RenderingHints rh = r.getRenderingHints();
rh.add(new
RenderingHints(RenderingHints.KEY_ALPHA_INTERPOLATION,RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY));
rh.add(new
RenderingHints(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON));
rh.add(new
RenderingHints(RenderingHints.KEY_COLOR_RENDERING,RenderingHints.VALUE_COLOR_RENDER_QUALITY));
rh.add(new
RenderingHints(RenderingHints.KEY_DITHERING,RenderingHints.VALUE_DITHER_DISABLE));
rh.add(new
RenderingHints(RenderingHints.KEY_FRACTIONALMETRICS,RenderingHints.VALUE_FRACTIONALMETRICS_ON));
rh.add(new
RenderingHints(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BICUBIC));
rh.add(new
RenderingHints(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_QUALITY));
rh.add(new
RenderingHints(RenderingHints.KEY_STROKE_CONTROL,RenderingHints.VALUE_STROKE_PURE));
rh.add(new
RenderingHints(RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_OFF));
return r;
}
};
float size = 180.0f;
// Set the transcoding hints.
t.addTranscodingHint(PNGTranscoder.KEY_WIDTH, size);
t.addTranscodingHint(PNGTranscoder.KEY_HEIGHT, size);
// Create the transcoder input.
String svgURI = new File(args[0]).toURI().toString();
TranscoderInput input = new TranscoderInput(svgURI);
// Create the transcoder output.
OutputStream ostream = new FileOutputStream("out.png");
TranscoderOutput output = new TranscoderOutput(ostream);
// Save the image.
t.transcode(input, output);
```
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