diff mupdf-source/platform/java/example/Example.java @ 3:2c135c81b16c

MERGE: upstream PyMuPDF 1.26.4 with MuPDF 1.26.7
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:44:09 +0200
parents b50eed0cc0ef
children
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/platform/java/example/Example.java	Mon Sep 15 11:44:09 2025 +0200
@@ -0,0 +1,136 @@
+// Copyright (C) 2022 Artifex Software, Inc.
+//
+// This file is part of MuPDF.
+//
+// MuPDF is free software: you can redistribute it and/or modify it under the
+// terms of the GNU Affero General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option)
+// any later version.
+//
+// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+// details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
+//
+// Alternative licensing terms are available from the licensor.
+// For commercial licensing, see <https://www.artifex.com/> or contact
+// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
+// CA 94129, USA, for further information.
+
+/**
+ * Render a page from a document at given zoom and rotation.
+ *
+ * To build this example in a source tree:
+ * make -C platform/java examples
+ *
+ * To render page 2 from a document (at 100% without rotation)
+ * and output the result as PNM to stdout, run:
+ * java -classpath build/java/debug -Djava.library.path=build/java/debug \
+ *         example.Example document.pdf 2
+ *
+ * For 150% size with 90 degree rotation, pass two more arguments:
+ * java -classpath build/java/debug -Djava.library.path=build/java/debug \
+ *         example.Example document.pdf 2 150 90
+ */
+
+package example;
+
+/* Import all MuPDF java classes. */
+import com.artifex.mupdf.fitz.*;
+
+class Example
+{
+	public static void main(String args[])
+	{
+		/* Parse arguments. */
+		if (args.length < 2)
+		{
+			System.err.println("usage: Example input-file page-number [ zoom [ rotate] ]");
+			System.err.println("\tinput-file: path of PDF, XPS, CBZ or EPUB document to open");
+			System.err.println("\tPage numbering starts from one.");
+			System.err.println("\tZoom level is in percent (100 percent is 72 dpi).");
+			System.err.println("\tRotation is in degrees clockwise.");
+			return;
+		}
+
+		String filename = args[0];
+		int pageNumber = Integer.parseInt(args[1]) - 1;
+		float zoom = 100;
+		if (args.length >= 3)
+			zoom = Float.parseFloat(args[2]);
+		float rotate = 0;
+		if (args.length >= 4)
+			rotate = Float.parseFloat(args[3]);
+
+		/* Open document using path. */
+		Document doc;
+		try {
+			doc = Document.openDocument(filename);
+		} catch (RuntimeException e) {
+			System.err.println("Error opening document: " + e);
+			return;
+		}
+
+		/* Count the number of pages. */
+		int pageCount;
+		try {
+			pageCount = doc.countPages();
+		} catch (RuntimeException e) {
+			System.err.println("Error counting number of pages: " + e);
+			return;
+		}
+
+		/* Check that the desired page is in range. */
+		if (pageNumber < 0 || pageNumber >= pageCount)
+		{
+			System.err.println("Page number out of range: " + pageNumber + " (page count " + pageCount + ")");
+			return;
+		}
+
+		/* Load the desired page from the document. */
+		Page page;
+		try {
+			page = doc.loadPage(pageNumber);
+		} catch (RuntimeException e) {
+			System.err.println("Error loading page " + (pageNumber + 1) + ": " + e);
+			return;
+		}
+
+		/* Create a transformation matrix based on
+		 * zoom factor and rotation supplied by user.
+		 */
+		Matrix ctm = Matrix.Scale(zoom / 100);
+		ctm.concat(Matrix.Rotate(rotate));
+
+		/* Render page to an RGB pixmap without transparency. */
+		Pixmap pixmap = null;
+		try {
+			pixmap = page.toPixmap(ctm, ColorSpace.DeviceRGB, false, true);
+		} catch (RuntimeException e) {
+			System.err.println("Error loading page " + (pageNumber + 1) + ": " + e);
+			return;
+		}
+
+		/* Output RGB pixmap to PNM image. */
+		System.out.println("P3");
+		System.out.println(pixmap.getWidth() + " " + pixmap.getHeight());
+		System.out.println("255");
+		for (int y = 0; y < pixmap.getHeight(); y++)
+		{
+			for (int x = 0; x < pixmap.getWidth(); x++)
+			{
+				int r = ((int) pixmap.getSample(x, y, 0)) & 0xff;
+				int g = ((int) pixmap.getSample(x, y, 1)) & 0xff;
+				int b = ((int) pixmap.getSample(x, y, 2)) & 0xff;
+				if (x == 0)
+					System.out.format("%3d %3d %3d", r, g, b);
+				else
+					System.out.format("  %3d %3d %3d", r, g, b);
+			}
+			System.out.println("");
+		}
+	}
+}