From 48f5d94ed0812ff131b7a30c6e86b67f1cceb285 Mon Sep 17 00:00:00 2001
From: Mathieu Baudier <mbaudier@argeo.org>
Date: Tue, 3 May 2022 15:11:50 +0200
Subject: [PATCH] Introduce SVG to PNG converter

---
 .../src/org/argeo/app/image/SvgToPng.java     | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 org.argeo.app.core/src/org/argeo/app/image/SvgToPng.java

diff --git a/org.argeo.app.core/src/org/argeo/app/image/SvgToPng.java b/org.argeo.app.core/src/org/argeo/app/image/SvgToPng.java
new file mode 100644
index 0000000..38aeb91
--- /dev/null
+++ b/org.argeo.app.core/src/org/argeo/app/image/SvgToPng.java
@@ -0,0 +1,64 @@
+package org.argeo.app.image;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.Reader;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import org.apache.batik.transcoder.TranscoderException;
+import org.apache.batik.transcoder.TranscoderInput;
+import org.apache.batik.transcoder.TranscoderOutput;
+import org.apache.batik.transcoder.image.ImageTranscoder;
+import org.apache.batik.transcoder.image.PNGTranscoder;
+import org.apache.commons.io.FilenameUtils;
+
+public class SvgToPng {
+
+	public void convertSvgDir(Path sourceDir, Path targetDir, int width) {
+		System.out.println("##\n## " + width + "px - " + sourceDir+"\n##");
+		try {
+			if (targetDir == null)
+				targetDir = sourceDir.getParent().resolve(Integer.toString(width));
+			Files.createDirectories(targetDir);
+
+			PNGTranscoder transcoder = new PNGTranscoder();
+			// transcoder.addTranscodingHint(ImageTranscoder.KEY_BACKGROUND_COLOR,
+			// Color.WHITE);
+			transcoder.addTranscodingHint(PNGTranscoder.KEY_WIDTH, (float) width);
+			transcoder.addTranscodingHint(PNGTranscoder.KEY_HEIGHT, (float) width);
+
+			for (Path source : Files.newDirectoryStream(sourceDir, "*.svg")) {
+				String baseName = FilenameUtils.getBaseName(source.toString());
+				Path target = targetDir.resolve(baseName + ".png");
+				convertSvgFile(transcoder, source, target);
+			}
+		} catch (IOException | TranscoderException e) {
+			throw new IllegalStateException("Cannot convert from " + sourceDir + " to " + targetDir, e);
+		}
+
+	}
+
+	protected void convertSvgFile(ImageTranscoder transcoder, Path source, Path target)
+			throws IOException, TranscoderException {
+		try (Reader reader = Files.newBufferedReader(source); OutputStream out = Files.newOutputStream(target);) {
+			TranscoderInput input = new TranscoderInput(reader);
+//			BufferedImage image = transcoder.createImage(32, 32);
+			TranscoderOutput output = new TranscoderOutput(out);
+			transcoder.transcode(input, output);
+			System.out.println(source.getFileName() + " -> " + target);
+		}
+	}
+
+	public static void main(String[] args) throws Exception {
+
+		Path path = Paths.get(args[0]);
+
+		SvgToPng svgToPng = new SvgToPng();
+		svgToPng.convertSvgDir(path, null, 16);
+		svgToPng.convertSvgDir(path, null, 32);
+		svgToPng.convertSvgDir(path, null, 64);
+		svgToPng.convertSvgDir(path, null, 96);
+	}
+}
-- 
2.30.2