Added ability to save image captures to external storage.

res/layout/image_editor_hud.xml

@@ -22,6 +22,7 @@
             android:layout_marginTop="8dp"
             android:layout_marginEnd="10dp"
             android:orientation="horizontal"
+            android:gravity="center_vertical"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintTop_toTopOf="parent">
 
@@ -41,6 +42,14 @@
                 android:padding="8dp"
                 android:src="@drawable/ic_undo_32" />
 
+            <ImageView
+                android:id="@+id/scribble_save_button"
+                android:layout_width="42dp"
+                android:layout_height="42dp"
+                android:background="?attr/selectableItemBackgroundBorderless"
+                android:padding="8dp"
+                android:src="@drawable/ic_download_32" />
+
             <ImageView
                 android:id="@+id/scribble_text_button"
                 android:layout_width="wrap_content"

src/org/thoughtcrime/securesms/scribbles/ImageEditorFragment.java

@@ -1,6 +1,8 @@
 package org.thoughtcrime.securesms.scribbles;
 
+import android.Manifest;
 import android.content.Intent;
+import android.graphics.Bitmap;
 import android.graphics.Paint;
 import android.net.Uri;
 import android.os.Bundle;
@@ -10,6 +12,7 @@ import androidx.fragment.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Toast;
 
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.imageeditor.ColorableRenderer;
@@ -22,9 +25,18 @@ import org.thoughtcrime.securesms.logging.Log;
 import org.thoughtcrime.securesms.mediasend.MediaSendPageFragment;
 import org.thoughtcrime.securesms.mms.MediaConstraints;
 import org.thoughtcrime.securesms.mms.PushMediaConstraints;
+import org.thoughtcrime.securesms.permissions.Permissions;
+import org.thoughtcrime.securesms.providers.BlobProvider;
 import org.thoughtcrime.securesms.scribbles.widget.VerticalSlideColorPicker;
+import org.thoughtcrime.securesms.util.MediaUtil;
 import org.thoughtcrime.securesms.util.ParcelUtil;
+import org.thoughtcrime.securesms.util.SaveAttachmentTask;
 import org.thoughtcrime.securesms.util.TextSecurePreferences;
+import org.thoughtcrime.securesms.util.concurrent.SignalExecutors;
+import org.thoughtcrime.securesms.util.concurrent.SimpleTask;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
 
 import static android.app.Activity.RESULT_OK;
 
@@ -287,6 +299,36 @@ public final class ImageEditorFragment extends Fragment implements ImageEditorHu
     refreshUniqueColors();
   }
 
+  @Override
+  public void onSave() {
+    SaveAttachmentTask.showWarningDialog(requireContext(), (dialogInterface, i) -> {
+      Permissions.with(this)
+                 .request(Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE)
+                 .ifNecessary()
+                 .withPermanentDenialDialog(getString(R.string.MediaPreviewActivity_signal_needs_the_storage_permission_in_order_to_write_to_external_storage_but_it_has_been_permanently_denied))
+                 .onAnyDenied(() -> Toast.makeText(requireContext(), R.string.MediaPreviewActivity_unable_to_write_to_external_storage_without_permission, Toast.LENGTH_LONG).show())
+                 .onAllGranted(() -> {
+                   SimpleTask.run(() -> {
+                     ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+                     Bitmap                image        = imageEditorView.getModel().render(requireContext());
+
+                     image.compress(Bitmap.CompressFormat.JPEG, 80, outputStream);
+
+                     return BlobProvider.getInstance()
+                                        .forData(outputStream.toByteArray())
+                                        .withMimeType(MediaUtil.IMAGE_JPEG)
+                                        .createForSingleUseInMemory();
+
+                   }, uri -> {
+                     SaveAttachmentTask saveTask = new SaveAttachmentTask(requireContext());
+                     SaveAttachmentTask.Attachment attachment = new SaveAttachmentTask.Attachment(uri, MediaUtil.IMAGE_JPEG, System.currentTimeMillis(), null);
+                     saveTask.executeOnExecutor(SignalExecutors.BOUNDED, attachment);
+                   });
+                 })
+                 .execute();
+    });
+  }
+
   @Override
   public void onFlipHorizontal() {
     imageEditorView.getModel().flipHorizontal();

src/org/thoughtcrime/securesms/scribbles/ImageEditorHud.java

@@ -36,6 +36,7 @@ public final class ImageEditorHud extends LinearLayout {
   private View                     textButton;
   private View                     stickerButton;
   private View                     undoButton;
+  private View                     saveButton;
   private View                     deleteButton;
   private View                     confirmButton;
   private VerticalSlideColorPicker colorPicker;
@@ -81,6 +82,7 @@ public final class ImageEditorHud extends LinearLayout {
     textButton       = findViewById(R.id.scribble_text_button);
     stickerButton    = findViewById(R.id.scribble_sticker_button);
     undoButton       = findViewById(R.id.scribble_undo_button);
+    saveButton       = findViewById(R.id.scribble_save_button);
     deleteButton     = findViewById(R.id.scribble_delete_button);
     confirmButton    = findViewById(R.id.scribble_confirm_button);
     colorPicker      = findViewById(R.id.scribble_color_picker);
@@ -100,7 +102,7 @@ public final class ImageEditorHud extends LinearLayout {
   }
 
   private void initializeVisibilityMap() {
-    setVisibleViewsWhenInMode(Mode.NONE, drawButton, highlightButton, textButton, stickerButton, cropButton, undoButton);
+    setVisibleViewsWhenInMode(Mode.NONE, drawButton, highlightButton, textButton, stickerButton, cropButton, undoButton, saveButton);
 
     setVisibleViewsWhenInMode(Mode.DRAW, confirmButton, undoButton, colorPicker, colorPalette);
 
@@ -145,6 +147,7 @@ public final class ImageEditorHud extends LinearLayout {
     highlightButton.setOnClickListener(v -> setMode(Mode.HIGHLIGHT));
     textButton.setOnClickListener(v -> setMode(Mode.TEXT));
     stickerButton.setOnClickListener(v -> setMode(Mode.MOVE_DELETE));
+    saveButton.setOnClickListener(v -> eventListener.onSave());
   }
 
   public void setColorPalette(@NonNull Set<Integer> colors) {
@@ -241,6 +244,7 @@ public final class ImageEditorHud extends LinearLayout {
     void onColorChange(int color);
     void onUndo();
     void onDelete();
+    void onSave();
     void onFlipHorizontal();
     void onRotate90AntiClockwise();
     void onCropAspectLock(boolean locked);
@@ -266,6 +270,10 @@ public final class ImageEditorHud extends LinearLayout {
     public void onDelete() {
     }
 
+    @Override
+    public void onSave() {
+    }
+
     @Override
     public void onFlipHorizontal() {
     }