Gallery2: fix thumbnail issue when using dual cam filter

When using some dual cam filter, the thumbnail shown to user did not
match final saved image because filter was not being correctly
applied to preview thumbnail. Correctly apply filter
to preview thumbnail so that it matches final saved image.

Change-Id: Ib8b750c7681aac38bef76dd90cb831ca6ac5ab5b

1 files changed, 44 insertions, 2 deletions

diff --git a/src/com/android/gallery3d/filtershow/tools/SaveImage.java b/src/com/android/gallery3d/filtershow/tools/SaveImage.java
index f04466f1b..cbe0f91a3 100644
--- a/src/com/android/gallery3d/filtershow/tools/SaveImage.java
+++ b/src/com/android/gallery3d/filtershow/tools/SaveImage.java
@@ -359,12 +359,47 @@ public class SaveImage {
 
         Uri savedUri = mSelectedImageUri;
         if (mPreviewImage != null) {
+            Bitmap previewBmp;
+            // Check for Fusion
+            FilterDualCamFusionRepresentation fusionRep =
+                    (FilterDualCamFusionRepresentation) preset.getFilterWithSerializationName(
+                    FilterDualCamFusionRepresentation.SERIALIZATION_NAME);
+            boolean hasFusion = (fusionRep != null && fusionRep.hasUnderlay());
+            if(hasFusion) {
+                // fusion. decode underlay image and get dest rect
+                Uri underLayUri = Uri.parse(fusionRep.getUnderlay());
+                Bitmap underlay = ImageLoader.loadConstrainedBitmap(underLayUri, mContext,
+                    Math.max(mPreviewImage.getWidth(), mPreviewImage.getHeight()), null, false);
+                RectF destRect = new RectF();
+                Rect imageBounds = MasterImage.getImage().getImageBounds();
+                Rect underlayBounds = MasterImage.getImage().getFusionBounds();
+                float underlayScaleFactor = (float)underlay.getWidth()
+                    / (float)underlayBounds.width();
+
+                destRect.left = (imageBounds.left - underlayBounds.left) * underlayScaleFactor;
+                destRect.right = (imageBounds.right - underlayBounds.left) * underlayScaleFactor;
+                destRect.top = (imageBounds.top - underlayBounds.top) * underlayScaleFactor;
+                destRect.bottom = (imageBounds.bottom - underlayBounds.top) * underlayScaleFactor;
+
+                Canvas canvas = new Canvas(underlay);
+                Paint paint = new Paint();
+                paint.reset();
+                paint.setAntiAlias(true);
+                paint.setFilterBitmap(true);
+                paint.setDither(true);
+
+                canvas.drawBitmap(mPreviewImage, null, destRect, paint);
+                previewBmp = underlay;
+            } else {
+                previewBmp = mPreviewImage;
+            }
+
             if (flatten) {
                 Object xmp = getPanoramaXMPData(newSourceUri, preset);
                 ExifInterface exif = getExifData(newSourceUri);
                 long time = System.currentTimeMillis();
                 updateExifData(exif, time);
-                if (putExifData(mDestinationFile, exif, mPreviewImage, quality)) {
+                if (putExifData(mDestinationFile, exif, previewBmp, quality)) {
                     putPanoramaXMPData(mDestinationFile, xmp);
                     ContentValues values = getContentValues(mContext, mSelectedImageUri, mDestinationFile, time);
                     Object result = mContext.getContentResolver().insert(
@@ -377,7 +412,7 @@ public class SaveImage {
                 long time = System.currentTimeMillis();
                 updateExifData(exif, time);
                 // If we succeed in writing the bitmap as a jpeg, return a uri.
-                if (putExifData(mDestinationFile, exif, mPreviewImage, quality)) {
+                if (putExifData(mDestinationFile, exif, previewBmp, quality)) {
                     putPanoramaXMPData(mDestinationFile, xmp);
                     // mDestinationFile will save the newSourceUri info in the XMP.
                     if (!flatten) {
@@ -390,6 +425,13 @@ public class SaveImage {
                             mDestinationFile, time, false);
                 }
             }
+
+            if(hasFusion) {
+                // recycle bitmap
+                previewBmp.recycle();
+                previewBmp = null;
+            }
+
             if (mCallback != null) {
                 mCallback.onPreviewSaved(savedUri);
             }