gnujpdf drawImage reverse fix

gnujpdf transparent images

libsrc/gnujpdf/src/gnu/jpdf/PDFMask.java

@@ -0,0 +1,99 @@
+package gnu.jpdf;
+
+import static gnu.jpdf.PDFImage.handlePixel;
+import java.awt.Image;
+import java.awt.image.ImageObserver;
+import java.awt.image.PixelGrabber;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.zip.DeflaterOutputStream;
+
+/**
+ *
+ * @author JPEXS
+ */
+public class PDFMask extends PDFStream implements ImageObserver {
+
+    private final Image img;
+    private int width;
+    private int height;
+
+    public PDFMask(Image img) {
+        super("/XObject");
+        this.img = img;
+        width = img.getWidth(this);
+        height = img.getHeight(this);
+    }
+
+    @Override
+    public boolean imageUpdate(Image img, int infoflags, int x, int y, int w, int h) {
+        if (infoflags == ImageObserver.WIDTH) {
+            width = w;
+        }
+        if (infoflags == ImageObserver.HEIGHT) {
+            height = h;
+        }
+
+        //return true;
+        //}
+        return false;
+    }
+
+    @Override
+    public void writeStream(OutputStream os) throws IOException {
+        ByteArrayOutputStream b = new ByteArrayOutputStream();
+        DeflaterOutputStream dos = new DeflaterOutputStream(b);
+        //,new Deflater(Deflater.BEST_COMPRESSION,true));
+        //buf.writeTo(dos);
+
+        int w = width;
+        int h = height;
+        int x = 0;
+        int y = 0;
+        int[] pixels = new int[w * h];
+        PixelGrabber pg = new PixelGrabber(img, x, y, w, h, pixels, 0, w);
+        try {
+            pg.grabPixels();
+        } catch (InterruptedException e) {
+            System.err.println("interrupted waiting for pixels!");
+            return;
+        }
+        if ((pg.getStatus() & ImageObserver.ABORT) != 0) {
+            System.err.println("image fetch aborted or errored");
+            return;
+        }
+        for (int j = 0; j < h; j++) {
+            for (int i = 0; i < w; i++) {
+                int p = pixels[j * w + i];
+                int alpha = 255 - (p >> 24) & 0xff;
+                dos.write(alpha);
+            }
+        }
+
+        dos.finish();
+        dos.close();
+
+        os.write("/Subtype /Image\n".getBytes());
+        os.write(("/Width " + width + "\n").getBytes());
+        os.write(("/Height " + height + "\n").getBytes());
+        os.write(("/BitsPerComponent 8\n").getBytes());
+        os.write(("/ColorSpace /DeviceGray\n").getBytes());
+        os.write(("/Decode [1 0]\n").getBytes());
+
+
+        // FlatDecode is compatible with the java.util.zip.Deflater class
+        os.write("/Filter /FlateDecode\n".getBytes());
+        os.write("/Length ".getBytes());
+        os.write(Integer.toString(b.size() + 1).getBytes());
+        os.write("\n>>\nstream\n".getBytes());
+        b.writeTo(os);
+        os.write("\n".getBytes());
+
+        os.write("endstream\nendobj\n".getBytes());
+
+        // Unlike most PDF objects, we dont call writeEnd(os) because we
+        // contain a stream
+    }
+
+}