Bugzilla: #33760

Resurrected Java2D/AWT Renderer (including bitmap output to PNG and TIFF using the Batik codecs and print capability).
Submitted by:	Renaud Richardet <renaud.richardet.at.gmail.com>

Changes on the original patch:
- PageViewport: isResolved() caused a NPE which I fixed.


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@198725 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 116 insertions, 0 deletions

diff --git a/src/java/org/apache/fop/render/bitmap/PNGRenderer.java b/src/java/org/apache/fop/render/bitmap/PNGRenderer.java
new file mode 100644
index 000000000..1e2820886
--- /dev/null
+++ b/src/java/org/apache/fop/render/bitmap/PNGRenderer.java
@@ -0,0 +1,116 @@
+package org.apache.fop.render.bitmap;
+
+import java.awt.image.RenderedImage;
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+import org.apache.batik.ext.awt.image.codec.PNGEncodeParam;
+import org.apache.batik.ext.awt.image.codec.PNGImageEncoder;
+import org.apache.fop.apps.FOPException;
+import org.apache.fop.area.PageViewport;
+import org.apache.fop.render.java2d.Java2DRenderer;
+
+/**
+ * PNG Renderer This class actually does not render itself, instead it extends
+ * <code>org.apache.fop.render.java2D.Java2DRenderer</code> and just encode
+ * rendering results into PNG format using Batik's image codec
+ */
+public class PNGRenderer extends Java2DRenderer {
+
+    /** The MIME type for png-Rendering */
+    public static final String MIME_TYPE = "image/png";
+
+    /** The file syntax prefix, eg. "page" will output "page1.png" etc */
+    private String fileSyntax;
+
+    /** The output directory where images are to be written */
+    private File outputDir;
+
+    /** The PNGEncodeParam for the image */
+    private PNGEncodeParam renderParams;
+
+    /** The OutputStream for the first Image */
+    private OutputStream firstOutputStream;
+
+    /** @see org.apache.fop.render.AbstractRenderer */
+    public String getMimeType() {
+        return MIME_TYPE;
+    }
+
+    /** default constructor */
+    public PNGRenderer() {}
+
+    /** @see org.apache.fop.render.Renderer#startRenderer(java.io.OutputStream) */
+    public void startRenderer(OutputStream outputStream) throws IOException {
+        getLogger().info("rendering areas to PNG");
+        setOutputDirectory();
+        this.firstOutputStream = outputStream;
+    }
+
+    /**
+     * Sets the output directory, either from the outfile specified on the
+     * command line, or from the directory specified in configuration file. Also
+     * sets the file name syntax, eg. "page"
+     */
+    private void setOutputDirectory() {
+
+        // the file provided on the command line
+        File f = getUserAgent().getOutputFile();
+
+        outputDir = f.getParentFile();
+
+        // extracting file name syntax
+        String s = f.getName();
+        int i = s.lastIndexOf(".");
+        if (s.charAt(i - 1) == '1') {
+            i--; // getting rid of the "1"
+        }
+        fileSyntax = s.substring(0, i);
+    }
+
+    public void stopRenderer() throws IOException {
+
+        super.stopRenderer();
+
+        for (int i = 0; i < pageViewportList.size(); i++) {
+
+            // Do the rendering: get the image for this page
+            RenderedImage image = (RenderedImage) getPageImage((PageViewport) pageViewportList
+                    .get(i));
+
+            // Encode this image
+            getLogger().debug("Encoding  Page " + (i + 1));
+            renderParams = PNGEncodeParam.getDefaultEncodeParam(image);
+            OutputStream os = getCurrentOutputStream(i);
+            PNGImageEncoder encoder = new PNGImageEncoder(os, renderParams);
+            encoder.encode(image);
+            os.flush();
+        }
+    }
+
+    /**
+     * Builds the OutputStream corresponding to this page
+     * @param 0-based pageNumber
+     * @return the corresponding OutputStream
+     */
+    private OutputStream getCurrentOutputStream(int pageNumber) {
+
+        if (pageNumber == 0) {
+            return firstOutputStream;
+        }
+
+        File f = new File(outputDir + File.separator + fileSyntax
+                + (pageNumber + 1) + ".png");
+        try {
+            OutputStream os = new BufferedOutputStream(new FileOutputStream(f));
+            return os;
+        } catch (FileNotFoundException e) {
+            new FOPException("Can't build the OutputStream\n" + e);
+            return null;
+        }
+    }
+}