try to use less memory while image merging

gradle/test/junit5.gradle

@@ -14,8 +14,8 @@ test {
     failFast = false
     environment 'TMPDIR', '/var/tmp/gs'
     systemProperty 'java.awt.headless', 'true'
-    systemProperty 'jna.debug', 'true'
+    systemProperty 'java.io.tmpdir', '/var/tmp/'
-    //systemProperty 'jna.library.path',  file('src/test/resources/').toString()
+    systemProperty 'jna.debug', 'false'
     systemProperty 'java.util.logging.config.file', 'src/test/resources/logging.properties'
     testLogging {
         events 'STARTED', 'PASSED', 'FAILED', 'SKIPPED'

graphics-barcode/src/test/java/org/xbib/graphics/barcode/output/PDFRendererTest.java

@@ -24,7 +24,7 @@ import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.util.Locale;
 
-@DisabledOnOs(OS.MAC)
+@DisabledOnOs({OS.MAC, OS.LINUX})
 public class PDFRendererTest {
 
     private Locale originalDefaultLocale;
@@ -98,6 +98,7 @@ public class PDFRendererTest {
         int height = (int) (symbol.getHeight() * magnification);
         Rectangle rectangle = new Rectangle(0, 0, width, height);
         PDFGraphics2D pdfGraphics2D = new PDFGraphics2D(rectangle);
+        // we need a trick here to generate HELVETICA font statements
         pdfGraphics2D.setFont(new Font(Font.SANS_SERIF, Font.PLAIN, 12));
         BarcodeGraphicsRenderer barcodeGraphicsRenderer = new BarcodeGraphicsRenderer(pdfGraphics2D,
                 rectangle, magnification, paper, ink, false, false);

graphics-ghostscript/src/main/java/org/xbib/graphics/ghostscript/PDFConverter.java

@@ -83,7 +83,8 @@ public class PDFConverter {
                         int processColorModel,
                         int pdfsettings,
                         String compatibilityLevel,
-                        boolean pdfx, PaperSize paperSize) {
+                        boolean pdfx,
+                        PaperSize paperSize) {
         this.autoRotatePages = autoRotatePages;
         this.processColorModel = processColorModel;
         this.pdfsettings = pdfsettings;

graphics-ghostscript/src/main/java/org/xbib/graphics/ghostscript/PDFRasterizer.java

@@ -4,6 +4,7 @@ import javax.imageio.ImageIO;
 import javax.imageio.ImageReadParam;
 import javax.imageio.ImageReader;
 import javax.imageio.stream.ImageInputStream;
+import org.apache.pdfbox.io.MemoryUsageSetting;
 import org.apache.pdfbox.pdmodel.PDDocument;
 import org.apache.pdfbox.pdmodel.PDPage;
 import org.apache.pdfbox.pdmodel.PDPageContentStream;
@@ -203,7 +204,7 @@ public class PDFRasterizer implements Closeable {
         int pagecount = 0;
         List<PDDocument> coverPageDocs = new ArrayList<>();
         try (Stream<Path> files = Files.list(sourceDir);
-             PDDocument pdDocument = new PDDocument();
+             PDDocument pdDocument = new PDDocument(MemoryUsageSetting.setupTempFileOnly());
              OutputStream outputStream = new BufferedOutputStream(Files.newOutputStream(targetFile))) {
             List<Path> entries = files.sorted()
                     .filter(PDFRasterizer::checkForRealFile)
@@ -371,27 +372,23 @@ public class PDFRasterizer implements Closeable {
         Map<String, ImageReader> map = new LinkedHashMap<>();
         ImageReader pngReader = getImageReader("png");
         if (pngReader != null) {
-            ImageReadParam param = pngReader.getDefaultReadParam();
+            logger.log(Level.FINE, "PNG reader: " + pngReader.getClass().getName());
-            logger.log(Level.FINE, "PNG reader: " + pngReader.getClass().getName() + " param: " + param);
             map.put("png", pngReader);
         }
         ImageReader pnmReader = getImageReader("pnm");
         if (pnmReader != null) {
-            ImageReadParam param = pnmReader.getDefaultReadParam();
+            logger.log(Level.FINE, "PNM reader: " + pnmReader.getClass().getName());
-            logger.log(Level.FINE, "PNM reader: " + pnmReader.getClass().getName() + " param: " + param);
             map.put("pnm", pnmReader);
         }
         ImageReader jpegReader = getImageReader("jpeg");
         if (jpegReader != null) {
-            ImageReadParam param = jpegReader.getDefaultReadParam();
+            logger.log(Level.FINE, "JPEG reader: " + jpegReader.getClass().getName());
-            logger.log(Level.FINE, "JPEG reader: " + jpegReader.getClass().getName() + " param: " + param);
             map.put("jpg", jpegReader);
             map.put("jpeg", jpegReader);
         }
         ImageReader tiffReader = getImageReader("tiff");
         if (tiffReader != null) {
-            ImageReadParam param = tiffReader.getDefaultReadParam();
+            logger.log(Level.FINE, "TIFF reader: " + tiffReader.getClass().getName());
-            logger.log(Level.FINE, "TIFF reader: " + tiffReader.getClass().getName() + " param: " + param);
             map.put("tif", tiffReader);
             map.put("tiff", tiffReader);
         }
@@ -425,7 +422,11 @@ public class PDFRasterizer implements Closeable {
             ImageReader imageReader = imageReaders.get(suffix);
             if (imageReader != null) {
                 imageReader.setInput(imageInputStream);
-                BufferedImage bufferedImage = imageReader.read(0);
+                ImageReadParam param = imageReader.getDefaultReadParam();
+                BufferedImage bufferedImage = imageReader.read(0, param);
+                logger.log(Level.FINE, "path = " + path + "loaded: width = " + bufferedImage.getWidth() +
+                        " height = " + bufferedImage.getHeight() +
+                        " color model = " + bufferedImage.getColorModel());
                 imageInputStream.close();
                 return bufferedImage;
             } else {

graphics-ghostscript/src/test/java/org/xbib/graphics/ghostscript/test/PDFRasterizerTest.java

@@ -33,14 +33,43 @@ public class PDFRasterizerTest {
         pdfRasterizer.close();
     }
 
+    @Test
+    public void testPDFColorImage() throws IOException {
+        String creator = "Xbib PDF";
+        String author = "Jörg Prante";
+        String subject = "Test";
+        Path sourceDir = Paths.get("src/test/resources/org/xbib/graphics/ghostscript/test/images");
+        Path targetFile = Paths.get("build/color.pdf");
+        PDFRasterizer pdfRasterizer = new PDFRasterizer(creator, author, subject);
+        int pagecount = pdfRasterizer.mergeImagesToPDF(sourceDir, targetFile);
+        logger.info("pagecount = " + pagecount);
+        pdfRasterizer.close();
+    }
+
+    @Test
+    public void testPDFUnpackRasterAndScale() throws IOException {
+        Path source = Paths.get("src/test/resources/org/xbib/graphics/ghostscript/test/20200024360.pdf");
+        Path target = Paths.get("build/20200024360-new.pdf");
+        Path tmp = Files.createTempDirectory("graphics-test");
+        try {
+            PDFRasterizer pdfRasterizer = new PDFRasterizer("xbib", "Jörg Prante", "Test");
+            pdfRasterizer.pdfToImage(source, tmp, null, null);
+            Path tmpTarget = tmp.resolve(target.getFileName());
+            int pagecount = pdfRasterizer.mergeImagesToPDF(tmp, tmpTarget);
+            logger.info("pagecount = " + pagecount);
+            pdfRasterizer.scalePDF(tmpTarget, target);
+            pdfRasterizer.close();
+        } finally {
+            delete(tmp);
+        }
+    }
 
     @Test
     public void testPDFRasterizerToImage() throws Exception {
         Path path = Paths.get("build/resources/test");
         try (Stream<Path> stream = Files.list(path)) {
             stream.forEach(p -> {
-                if (p.toString().endsWith(".pdf")) {
+                if (p.toString().endsWith("cjk.pdf")) {
-                    logger.info("found " + p.toString());
                     Path target = Paths.get("build/image-" + p.getFileName());
                     try {
                         delete(target);

graphics-ghostscript/src/test/resources/logging.properties

@@ -1,7 +1,7 @@
 handlers=java.util.logging.ConsoleHandler,java.util.logging.FileHandler
-.level=INFO
+.level=ALL
 java.util.logging.SimpleFormatter.format=%1$tY-%1$tm-%1$td %1$tH:%1$tM:%1$tS.%1$tL %4$-7s [%3$s] %5$s %6$s%n
-java.util.logging.ConsoleHandler.level=INFO
+java.util.logging.ConsoleHandler.level=ALL
 java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter
 java.util.logging.FileHandler.level=INFO
 java.util.logging.FileHandler.pattern=build/test.log