Implements FS#19, FS#84; Introduces ImageResizeException, MessageUtil and distinguishes between image resizing and compressing/saving

1 files changed, 60 insertions, 0 deletions

diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/ImageUtil.java b/src/main/java/de/thedevstack/conversationsplus/utils/ImageUtil.java
index 7e8cacd0..9250c432 100644
--- a/src/main/java/de/thedevstack/conversationsplus/utils/ImageUtil.java
+++ b/src/main/java/de/thedevstack/conversationsplus/utils/ImageUtil.java
@@ -11,17 +11,24 @@ import android.util.LruCache;
 
 import java.io.File;
 import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 
 import de.thedevstack.android.logcat.Logging;
+import de.thedevstack.conversationsplus.Config;
+import de.thedevstack.conversationsplus.R;
 import de.thedevstack.conversationsplus.entities.Message;
+import de.thedevstack.conversationsplus.exceptions.FileCopyException;
+import de.thedevstack.conversationsplus.exceptions.ImageResizeException;
 import de.thedevstack.conversationsplus.persistance.FileBackend;
 
 /**
  * This util provides
  */
 public final class ImageUtil {
+
+    private static int IMAGE_SIZE = 1920;
     private static LruCache<String, Bitmap> BITMAP_CACHE;
 
     /**
@@ -104,6 +111,59 @@ public final class ImageUtil {
     }
 
     /**
+     * Resizes and rotates an image given by uri and returns the bitmap.
+     * @param image the uri of the image to be resized and rotated
+     * @return resized and rotated bitmap
+     * @throws ImageResizeException
+     */
+    public static Bitmap resizeAndRotateImage(Uri image) throws ImageResizeException {
+        return ImageUtil.resizeAndRotateImage(image, 0);
+    }
+
+    /**
+     * Resizes and rotates an image given by uri and returns the bitmap.
+     * @param image the uri of the image to be resized and rotated
+     * @return resized and rotated bitmap
+     * @throws ImageResizeException
+     */
+    private static Bitmap resizeAndRotateImage(Uri image, int sampleSize) throws ImageResizeException {
+        InputStream imageInputStream = null;
+        try {
+            imageInputStream = StreamUtil.openInputStreamFromContentResolver(image);
+            Bitmap originalBitmap;
+            BitmapFactory.Options options = new BitmapFactory.Options();
+            int inSampleSize = (int) Math.pow(2, sampleSize);
+            Logging.d(Config.LOGTAG, "reading bitmap with sample size " + inSampleSize);
+            options.inSampleSize = inSampleSize;
+            originalBitmap = BitmapFactory.decodeStream(imageInputStream, null, options);
+            imageInputStream.close();
+            if (originalBitmap == null) {
+                throw new ImageResizeException(R.string.error_not_an_image_file);
+            }
+            Bitmap scaledBitmap = ImageUtil.resize(originalBitmap, IMAGE_SIZE);
+            int rotation = ImageUtil.getRotation(image);
+            if (rotation > 0) {
+                scaledBitmap = ImageUtil.rotate(scaledBitmap, rotation);
+            }
+
+            return scaledBitmap;
+        } catch (FileNotFoundException e) {
+            throw new ImageResizeException(R.string.error_file_not_found);
+        } catch (IOException e) {
+            throw new ImageResizeException(R.string.error_io_exception);
+        } catch (OutOfMemoryError e) {
+            ++sampleSize;
+            if (sampleSize <= 3) {
+                return resizeAndRotateImage(image, sampleSize);
+            } else {
+                throw new ImageResizeException(R.string.error_out_of_memory);
+            }
+        } finally {
+            StreamUtil.close(imageInputStream);
+        }
+    }
+
+    /**
      * Returns the rotation from the exif information of an image identified with the given uri.
      * The orientation is retrieved by parsing the stream of the image.
      * FileNotFoundException is silently ignored.