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Posted to commits@pdfbox.apache.org by ti...@apache.org on 2023/05/19 05:36:04 UTC
svn commit: r1909921 - /pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/printing/OpaquePDFRenderer.java
Author: tilman
Date: Fri May 19 05:36:03 2023
New Revision: 1909921
URL: http://svn.apache.org/viewvc?rev=1909921&view=rev
Log:
PDFBOX-5605: add processor that sets default values for ca and CA
Modified:
pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/printing/OpaquePDFRenderer.java
Modified: pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/printing/OpaquePDFRenderer.java
URL: http://svn.apache.org/viewvc/pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/printing/OpaquePDFRenderer.java?rev=1909921&r1=1909920&r2=1909921&view=diff
==============================================================================
--- pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/printing/OpaquePDFRenderer.java (original)
+++ pdfbox/branches/2.0/examples/src/main/java/org/apache/pdfbox/examples/printing/OpaquePDFRenderer.java Fri May 19 05:36:03 2023
@@ -29,6 +29,7 @@ import org.apache.commons.logging.LogFac
import org.apache.pdfbox.contentstream.operator.MissingOperandException;
import org.apache.pdfbox.contentstream.operator.Operator;
import org.apache.pdfbox.contentstream.operator.OperatorName;
+import org.apache.pdfbox.contentstream.operator.OperatorProcessor;
import org.apache.pdfbox.contentstream.operator.graphics.GraphicsOperatorProcessor;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSName;
@@ -37,6 +38,7 @@ import org.apache.pdfbox.pdmodel.PDDocum
import org.apache.pdfbox.pdmodel.graphics.PDXObject;
import org.apache.pdfbox.pdmodel.graphics.form.PDFormXObject;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
+import org.apache.pdfbox.pdmodel.graphics.state.PDExtendedGraphicsState;
import org.apache.pdfbox.printing.PDFPrintable;
import org.apache.pdfbox.printing.Scaling;
import org.apache.pdfbox.rendering.PDFRenderer;
@@ -44,11 +46,12 @@ import org.apache.pdfbox.rendering.PageD
import org.apache.pdfbox.rendering.PageDrawerParameters;
/**
- * PDF documents with transparency groups are sometimes printed slowly and in poor quality, see
- * <a href="https://issues.apache.org/jira/browse/PDFBOX-4123">PDFBOX-4123</a>. If the transparency
- * groups aren't really needed (e.g. for most labels), we can use a custom PDFRenderer / PageDrawer
- * that uses a custom DrawObject class which doesn't call showTransparencyGroup() but only
- * showForm().
+ * PDF documents with transparency are sometimes printed slowly and in poor quality, see
+ * <a href="https://issues.apache.org/jira/browse/PDFBOX-4123">PDFBOX-4123</a> and
+ * <a href="https://issues.apache.org/jira/browse/PDFBOX-5605">PDFBOX-5605</a>. If the transparency
+ * isn't really needed (e.g. for most labels), we can use a custom PDFRenderer / PageDrawer that
+ * uses a custom DrawObject class which doesn't call showTransparencyGroup() but only showForm() and
+ * sets ca and CA to 1.
* <p>
* This OpaquePDFRenderer class object can be passed to the "long" constructor of
* {@link PDFPrintable#PDFPrintable(org.apache.pdfbox.pdmodel.PDDocument, org.apache.pdfbox.printing.Scaling, boolean, float, boolean, org.apache.pdfbox.rendering.PDFRenderer)}.
@@ -61,7 +64,10 @@ public class OpaquePDFRenderer extends P
public static void main(String[] args) throws IOException, PrinterException
{
// PDF from the QZ Tray project, who reported this problem.
- InputStream is = new URL("https://github.com/qzind/tray/files/1749977/test.pdf").openStream();
+ // Also test with
+ // https://github.com/qzind/tray/files/11432463/sample_file-1.pdf
+ // (second page)
+ InputStream is = new URL("https://github.com/qzind/tray/files/11432463/sample_file-1.pdf").openStream();
PDDocument doc = PDDocument.load(is);
is.close();
PDFRenderer renderer = new OpaquePDFRenderer(doc);
@@ -94,6 +100,7 @@ public class OpaquePDFRenderer extends P
{
super(parameters);
addOperator(new OpaqueDrawObject());
+ addOperator(new OpaqueSetGraphicsStateParameters());
}
}
@@ -153,4 +160,44 @@ public class OpaquePDFRenderer extends P
return OperatorName.DRAW_OBJECT;
}
}
+
+ // copied from org.apache.pdfbox.contentstream.operator.state.SetGraphicsStateParameters()
+ // but resets ca and CA
+ private static class OpaqueSetGraphicsStateParameters extends OperatorProcessor
+ {
+ private static final Log LOG = LogFactory.getLog(OpaqueSetGraphicsStateParameters.class);
+
+ @Override
+ public void process(Operator operator, List<COSBase> arguments) throws IOException
+ {
+ if (arguments.isEmpty())
+ {
+ throw new MissingOperandException(operator, arguments);
+ }
+ COSBase base0 = arguments.get(0);
+ if (!(base0 instanceof COSName))
+ {
+ return;
+ }
+
+ // set parameters from graphics state parameter dictionary
+ COSName graphicsName = (COSName) base0;
+ PDExtendedGraphicsState gs = context.getResources().getExtGState(graphicsName);
+ if (gs == null)
+ {
+ LOG.error("name for 'gs' operator not found in resources: /" + graphicsName.getName());
+ return;
+ }
+ gs.setNonStrokingAlphaConstant(1f);
+ gs.setStrokingAlphaConstant(1f);
+ gs.copyIntoGraphicsState(context.getGraphicsState());
+ }
+
+ @Override
+ public String getName()
+ {
+ return OperatorName.SET_GRAPHICS_STATE_PARAMS;
+ }
+ }
+
}