fdo#62591 - change Impress remote slide previews building

* Store bitmaps directly instead of byte arrays.
* Store bitmaps with shadows instead of one set with shadows and another
  without them.

This change should optimize memory usage a bit.

Change-Id: Ied7ce57a660438a06167e8984d16a6f26ebd8c23
Reviewed-on: https://gerrit.libreoffice.org/2917Reviewed-by: Michael Meeks <michael.meeks@suse.com>
Tested-by: Michael Meeks <michael.meeks@suse.com>

android/sdremote/src/org/libreoffice/impressremote/PresentationFragment.java

@@ -21,10 +21,7 @@ import android.content.IntentFilter;
 import android.content.ServiceConnection;
 import android.content.res.Configuration;
 import android.graphics.Bitmap;
-import android.graphics.Canvas;
 import android.graphics.Color;
-import android.graphics.Paint;
-import android.graphics.RectF;
 import android.os.Bundle;
 import android.os.IBinder;
 import android.support.v4.content.LocalBroadcastManager;
@@ -38,7 +35,6 @@ import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemSelectedListener;
 import android.widget.ImageView;
 import android.widget.TextView;
-
 import com.actionbarsherlock.app.SherlockFragment;
 
 public class PresentationFragment extends SherlockFragment {
@@ -306,24 +302,7 @@ public class PresentationFragment extends SherlockFragment {
 
         @Override
         protected Bitmap createBitmap(int position) {
-            Bitmap aBitmap = mSlideShow.getImage(position);
-            final int borderWidth = 8;
-
-            Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);
-            p.setShadowLayer(borderWidth, 0, 0, Color.BLACK);
-
-            RectF aRect = new RectF(borderWidth, borderWidth, borderWidth
-                            + aBitmap.getWidth(), borderWidth
-                            + aBitmap.getHeight());
-            Bitmap aOut = Bitmap.createBitmap(aBitmap.getWidth() + 2
-                            * borderWidth, aBitmap.getHeight() + 2
-                            * borderWidth, aBitmap.getConfig());
-            Canvas canvas = new Canvas(aOut);
-            canvas.drawColor(getResources().getColor(R.color.light_grey));
-            canvas.drawRect(aRect, p);
-            canvas.drawBitmap(aBitmap, null, aRect, null);
-
-            return aOut;
+            return mSlideShow.getImage(position);
         }
     }
 }

android/sdremote/src/org/libreoffice/impressremote/communication/SlideShow.java

@@ -9,17 +9,20 @@
 package org.libreoffice.impressremote.communication;
 
 import org.libreoffice.impressremote.R;
-import org.libreoffice.impressremote.Globals;
 
-import android.util.Log;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.RectF;
 import android.util.SparseArray;
 
+
 public class SlideShow {
 
-    private SparseArray<byte[]> mPreviewImages = new SparseArray<byte[]>();
+    private SparseArray<Bitmap> mPreviews = new SparseArray<Bitmap>();
     private SparseArray<String> mNotes = new SparseArray<String>();
 
     private int mSize = 0;
@@ -47,28 +50,28 @@ public class SlideShow {
     }
 
     protected void putImage(int aSlide, byte[] aImage) {
-        mPreviewImages.put(aSlide, aImage);
+        Bitmap aBitmap = BitmapFactory.decodeByteArray(aImage, 0, aImage.length);
+        final int borderWidth = 8;
+
+        Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);
+        p.setShadowLayer(borderWidth, 0, 0, Color.BLACK);
+
+        RectF aRect = new RectF(borderWidth, borderWidth, borderWidth
+                        + aBitmap.getWidth(), borderWidth
+                        + aBitmap.getHeight());
+        Bitmap aOut = Bitmap.createBitmap(aBitmap.getWidth() + 2
+                        * borderWidth, aBitmap.getHeight() + 2
+                        * borderWidth, aBitmap.getConfig());
+        Canvas canvas = new Canvas(aOut);
+        canvas.drawColor(mContext.getResources().getColor(R.color.light_grey));
+        canvas.drawRect(aRect, p);
+        canvas.drawBitmap(aBitmap, null, aRect, null);
+
+        mPreviews.put(aSlide, aOut);
     }
 
     public Bitmap getImage(int aSlide) {
-        byte[] aImage = mPreviewImages.get(aSlide);
-        if (aImage == null) {
-            return BitmapFactory.decodeResource(mContext.getResources(),
-                            R.drawable.image_loading);
-        }
-        Bitmap aBitmap = null;
-        try {
-            aBitmap = BitmapFactory.decodeByteArray(aImage, 0, aImage.length);
-        } catch (OutOfMemoryError e) {
-            Log.e(Globals.TAG, "Bitmap decoding error byte length: " + aImage.length +
-                  "first 4 bytes: " + aImage[0] + " " + aImage[1] + " " + aImage[2] + " " + aImage[3] +
-                  "Exception " + e);
-        }
-        if (aBitmap == null) {
-            return BitmapFactory.decodeResource(mContext.getResources(),
-                            R.drawable.image_loading);
-        }
-        return aBitmap;
+        return mPreviews.get(aSlide);
     }
 
     protected void putNotes(int aSlide, String aNotes) {