Fixed Nexus 5x barcode scanning issues

#280
#313
The above code actually rotates only 90 degree.It works fine
if device having normal camera orientation(Landscape).But
for Nexus 5X device camera orientation is reverse landscape and
it rotates 90 degree,so the preview data will be upside down.
Normally when we use rectangle at center,it is very hard to identify this issue,
because zxing scans barcode even if it is in reverse angle.When we move the
rectangle points we can identify this issue.
To fix this issue,I have rotated data based on camera orientation.Now it rotates
270 degree on Nexus device and 90 degree on normal orientation devices.

core/src/main/java/me/dm7/barcodescanner/core/BarcodeScannerView.java

@@ -21,6 +21,10 @@ public abstract class BarcodeScannerView extends FrameLayout implements Camera.P
     private boolean mAutofocusState = true;
     private boolean mShouldScaleToFill = true;
 
+    public CameraPreview getCameraPreview() {
+        return mPreview;
+    }
+
     public BarcodeScannerView(Context context) {
         super(context);
     }

zxing/build.gradle

@@ -9,7 +9,7 @@ ext {
 }
 
 dependencies {
-    //compile project(":core")
+    compile project(":core")
     compile libraries.barcodescanner_core
     compile libraries.zxing_core
 }

zxing/src/main/java/me/dm7/barcodescanner/zxing/ZXingScannerView.java

@@ -106,7 +106,7 @@ public void onPreviewFrame(byte[] data, Camera camera) {
             int width = size.width;
             int height = size.height;
 
-            if (DisplayUtils.getScreenOrientation(getContext()) == Configuration.ORIENTATION_PORTRAIT) {
+            /*if (DisplayUtils.getScreenOrientation(getContext()) == Configuration.ORIENTATION_PORTRAIT) {
                 byte[] rotatedData = new byte[data.length];
                 for (int y = 0; y < height; y++) {
                     for (int x = 0; x < width; x++)
@@ -116,6 +116,45 @@ public void onPreviewFrame(byte[] data, Camera camera) {
                 width = height;
                 height = tmp;
                 data = rotatedData;
+            }*/
+
+            /**
+             * Fixed Nexus 5x barcode scanning issues
+             * https://github.com/dm77/barcodescanner/issues/280
+             * https://github.com/dm77/barcodescanner/issues/313
+             * The above code actually rotates only 90 degree.It works fine
+             * if device having normal camera orientation(Landscape).But
+             * for Nexus 5X device camera orientation is reverse landscape and
+             * it rotates 90 degree,so the preview data will be upside down.
+             * Normally when we use rectangle at center,it is very hard to identify this issue,
+             * because zxing scans barcode even if it is in reverse angle.When we move the
+             * rectangle points we can identify this issue.
+             * To fix this issue,I have rotated data based on camera orientation.Now it rotates
+             * 270 degree on Nexus device and 90 degree on normal orientation devices.
+             */
+            int displayOrientation = getCameraPreview().getDisplayOrientation();
+
+            int rotationCount = 0;
+            switch (displayOrientation) {
+                case 0: rotationCount = 0; break;
+                case 90: rotationCount = 1; break;
+                case 180: rotationCount = 2; break;
+                case 270: rotationCount = 3; break;
+            }
+
+            for (int i = 0; i < rotationCount; i++) {
+                if (DisplayUtils.getScreenOrientation(getContext()) == Configuration.ORIENTATION_PORTRAIT) {
+                    byte[] rotatedData = new byte[data.length];
+                    for (int y = 0; y < height; y++) {
+                        for (int x = 0; x < width; x++)
+                            rotatedData[x * height + height - y - 1] = data[x + y * width];
+                    }
+                    int tmp = width;
+                    width = height;
+                    height = tmp;
+                    data = rotatedData;
+                    Log.d(TAG, "onPreviewFrame: rotated data");
+                }
             }
 
             Result rawResult = null;