Frame rotation improvements (#745)

* Add Frame.rotationToUser and Frame.rotationToView

* Update docs

* Add missing annotation

cameraview/src/androidTest/java/com/otaliastudios/cameraview/frame/ByteBufferFrameManagerTest.java

@@ -7,6 +7,7 @@ import androidx.test.ext.junit.runners.AndroidJUnit4;
 import androidx.test.filters.SmallTest;
 
 import com.otaliastudios.cameraview.BaseTest;
+import com.otaliastudios.cameraview.engine.offset.Angles;
 import com.otaliastudios.cameraview.size.Size;
 
 import org.junit.After;
@@ -26,6 +27,7 @@ import static org.mockito.Mockito.verify;
 @SmallTest
 public class ByteBufferFrameManagerTest extends BaseTest {
 
+    private final Angles angles = new Angles();
     private ByteBufferFrameManager.BufferCallback callback;
 
     @Before
@@ -41,22 +43,22 @@ public class ByteBufferFrameManagerTest extends BaseTest {
     @Test
     public void testAllocate() {
         ByteBufferFrameManager manager = new ByteBufferFrameManager(1, callback);
-        manager.setUp(ImageFormat.NV21, new Size(50, 50));
+        manager.setUp(ImageFormat.NV21, new Size(50, 50), angles);
         verify(callback, times(1)).onBufferAvailable(any(byte[].class));
         reset(callback);
 
         manager = new ByteBufferFrameManager(5, callback);
-        manager.setUp(ImageFormat.NV21, new Size(50, 50));
+        manager.setUp(ImageFormat.NV21, new Size(50, 50), angles);
         verify(callback, times(5)).onBufferAvailable(any(byte[].class));
     }
 
     @Test
     public void testOnFrameReleased_alreadyFull() {
         ByteBufferFrameManager manager = new ByteBufferFrameManager(1, callback);
-        manager.setUp(ImageFormat.NV21, new Size(50, 50));
+        manager.setUp(ImageFormat.NV21, new Size(50, 50), angles);
         int length = manager.getFrameBytes();
 
-        Frame frame1 = manager.getFrame(new byte[length], 0, 0);
+        Frame frame1 = manager.getFrame(new byte[length], 0);
         assertNotNull(frame1);
         // Since frame1 is already taken and poolSize = 1, getFrame() would return null.
         // To create a new frame, freeze the first one.
@@ -73,12 +75,12 @@ public class ByteBufferFrameManagerTest extends BaseTest {
     @Test
     public void testOnFrameReleased_sameLength() {
         ByteBufferFrameManager manager = new ByteBufferFrameManager(1, callback);
-        manager.setUp(ImageFormat.NV21, new Size(50, 50));
+        manager.setUp(ImageFormat.NV21, new Size(50, 50), angles);
         int length = manager.getFrameBytes();
 
         // A camera preview frame comes. Request a frame.
         byte[] picture = new byte[length];
-        Frame frame = manager.getFrame(picture, 0, 0);
+        Frame frame = manager.getFrame(picture, 0);
         assertNotNull(frame);
 
         // Release the frame and ensure that onBufferAvailable is called.
@@ -90,16 +92,16 @@ public class ByteBufferFrameManagerTest extends BaseTest {
     @Test
     public void testOnFrameReleased_differentLength() {
         ByteBufferFrameManager manager = new ByteBufferFrameManager(1, callback);
-        manager.setUp(ImageFormat.NV21, new Size(50, 50));
+        manager.setUp(ImageFormat.NV21, new Size(50, 50), angles);
         int length = manager.getFrameBytes();
 
         // A camera preview frame comes. Request a frame.
         byte[] picture = new byte[length];
-        Frame frame = manager.getFrame(picture, 0, 0);
+        Frame frame = manager.getFrame(picture, 0);
         assertNotNull(frame);
 
         // Don't release the frame. Change the allocation size.
-        manager.setUp(ImageFormat.NV16, new Size(15, 15));
+        manager.setUp(ImageFormat.NV16, new Size(15, 15), angles);
 
         // Now release the old frame and ensure that onBufferAvailable is NOT called,
         // because the released data has wrong length.

cameraview/src/androidTest/java/com/otaliastudios/cameraview/frame/FrameManagerTest.java

@@ -8,6 +8,7 @@ import androidx.test.ext.junit.runners.AndroidJUnit4;
 import androidx.test.filters.SmallTest;
 
 import com.otaliastudios.cameraview.BaseTest;
+import com.otaliastudios.cameraview.engine.offset.Angles;
 import com.otaliastudios.cameraview.size.Size;
 
 import org.junit.Test;
@@ -18,14 +19,14 @@ import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 import static org.mockito.Matchers.any;
 import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.never;
-import static org.mockito.Mockito.reset;
 import static org.mockito.Mockito.verify;
 
 @RunWith(AndroidJUnit4.class)
 @SmallTest
 public class FrameManagerTest extends BaseTest {
 
+    private final Angles angles = new Angles();
+
     @Test
     public void testFrameRecycling() {
         // A 1-pool manager will always recycle the same frame.
@@ -39,12 +40,12 @@ public class FrameManagerTest extends BaseTest {
                 return data;
             }
         };
-        manager.setUp(ImageFormat.NV21, new Size(50, 50));
+        manager.setUp(ImageFormat.NV21, new Size(50, 50), angles);
 
-        Frame first = manager.getFrame("foo", 0, 0);
+        Frame first = manager.getFrame("foo", 0);
         assertNotNull(first);
         first.release();
-        Frame second = manager.getFrame("bar", 0, 0);
+        Frame second = manager.getFrame("bar", 0);
         assertNotNull(second);
         second.release();
         assertEquals(first, second);
@@ -62,11 +63,11 @@ public class FrameManagerTest extends BaseTest {
                 return data;
             }
         };
-        manager.setUp(ImageFormat.NV21, new Size(50, 50));
+        manager.setUp(ImageFormat.NV21, new Size(50, 50), angles);
 
-        Frame first = manager.getFrame("foo", 0, 0);
+        Frame first = manager.getFrame("foo", 0);
         assertNotNull(first);
-        Frame second = manager.getFrame("bar", 0, 0);
+        Frame second = manager.getFrame("bar", 0);
         assertNull(second);
     }
 }

cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera1Engine.java

@@ -231,7 +231,7 @@ public class Camera1Engine extends CameraBaseEngine implements
 
         mCamera.setPreviewCallbackWithBuffer(null); // Release anything left
         mCamera.setPreviewCallbackWithBuffer(this); // Add ourselves
-        getFrameManager().setUp(PREVIEW_FORMAT, mPreviewStreamSize);
+        getFrameManager().setUp(PREVIEW_FORMAT, mPreviewStreamSize, getAngles());
 
         LOG.i("onStartPreview", "Starting preview with startPreview().");
         try {
@@ -795,9 +795,7 @@ public class Camera1Engine extends CameraBaseEngine implements
             // Seen this happen in logs.
             return;
         }
-        int rotation = getAngles().offset(Reference.SENSOR, Reference.OUTPUT,
+        Frame frame = getFrameManager().getFrame(data, System.currentTimeMillis());
-                Axis.RELATIVE_TO_SENSOR);
-        Frame frame = getFrameManager().getFrame(data, System.currentTimeMillis(), rotation);
         if (frame != null) {
             getCallback().dispatchFrame(frame);
         }

cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera2Engine.java

@@ -70,7 +70,6 @@ import com.otaliastudios.cameraview.size.Size;
 import com.otaliastudios.cameraview.video.Full2VideoRecorder;
 import com.otaliastudios.cameraview.video.SnapshotVideoRecorder;
 
-import java.io.FileDescriptor;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.Callable;
@@ -609,7 +608,7 @@ public class Camera2Engine extends CameraBaseEngine implements
         mPreview.setStreamSize(previewSizeForView.getWidth(), previewSizeForView.getHeight());
         mPreview.setDrawRotation(getAngles().offset(Reference.BASE, Reference.VIEW, Axis.ABSOLUTE));
         if (hasFrameProcessors()) {
-            getFrameManager().setUp(mFrameProcessingFormat, mFrameProcessingSize);
+            getFrameManager().setUp(mFrameProcessingFormat, mFrameProcessingSize, getAngles());
         }
 
         LOG.i("onStartPreview:", "Starting preview.");
@@ -1443,10 +1442,7 @@ public class Camera2Engine extends CameraBaseEngine implements
             // After preview, the frame manager is correctly set up
             //noinspection unchecked
             Frame frame = getFrameManager().getFrame(image,
-                    System.currentTimeMillis(),
+                    System.currentTimeMillis());
-                    getAngles().offset(Reference.SENSOR,
-                            Reference.OUTPUT,
-                            Axis.RELATIVE_TO_SENSOR));
             if (frame != null) {
                 LOG.v("onImageAvailable:", "Image acquired, dispatching.");
                 getCallback().dispatchFrame(frame);

cameraview/src/main/java/com/otaliastudios/cameraview/filter/BaseFilter.java

@@ -177,7 +177,7 @@ public abstract class BaseFilter implements Filter {
     }
 
     @Override
-    public void draw(long timestampUs, float[] transformMatrix) {
+    public void draw(long timestampUs, @NonNull float[] transformMatrix) {
         if (programHandle == -1) {
             LOG.w("Filter.draw() called after destroying the filter. " +
                     "This can happen rarely because of threading.");
@@ -188,7 +188,7 @@ public abstract class BaseFilter implements Filter {
         }
     }
 
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         // Copy the model / view / projection matrix over.
         GLES20.glUniformMatrix4fv(vertexModelViewProjectionMatrixLocation, 1,
                 false, GlUtils.IDENTITY_MATRIX, 0);

cameraview/src/main/java/com/otaliastudios/cameraview/filter/Filter.java

@@ -70,7 +70,7 @@ public interface Filter {
      * @param timestampUs timestamp in microseconds
      * @param transformMatrix matrix
      */
-    void draw(long timestampUs, float[] transformMatrix);
+    void draw(long timestampUs, @NonNull float[] transformMatrix);
 
     /**
      * Called anytime the output size changes.

cameraview/src/main/java/com/otaliastudios/cameraview/filter/MultiFilter.java

@@ -237,7 +237,7 @@ public class MultiFilter implements Filter, OneParameterFilter, TwoParameterFilt
     }
 
     @Override
-    public void draw(long timestampUs, float[] transformMatrix) {
+    public void draw(long timestampUs, @NonNull float[] transformMatrix) {
         synchronized (lock) {
             for (int i = 0; i < filters.size(); i++) {
                 boolean isFirst = i == 0;

cameraview/src/main/java/com/otaliastudios/cameraview/filters/AutoFixFilter.java

@@ -117,7 +117,7 @@ public class AutoFixFilter extends BaseFilter implements OneParameterFilter {
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         GLES20.glUniform1f(scaleLocation, scale);
         GlUtils.checkError("glUniform1f");

cameraview/src/main/java/com/otaliastudios/cameraview/filters/BrightnessFilter.java

@@ -86,7 +86,7 @@ public class BrightnessFilter extends BaseFilter implements OneParameterFilter {
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         GLES20.glUniform1f(brightnessLocation, brightness);
         GlUtils.checkError("glUniform1f");

cameraview/src/main/java/com/otaliastudios/cameraview/filters/ContrastFilter.java

@@ -88,7 +88,7 @@ public class ContrastFilter extends BaseFilter implements OneParameterFilter {
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         GLES20.glUniform1f(contrastLocation, contrast);
         GlUtils.checkError("glUniform1f");

cameraview/src/main/java/com/otaliastudios/cameraview/filters/DocumentaryFilter.java

@@ -93,7 +93,7 @@ public class DocumentaryFilter extends BaseFilter {
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         float[] scale = new float[2];
         if (mWidth > mHeight) {

cameraview/src/main/java/com/otaliastudios/cameraview/filters/DuotoneFilter.java

@@ -137,7 +137,7 @@ public class DuotoneFilter extends BaseFilter implements TwoParameterFilter {
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         float[] first = new float[]{
                 Color.red(mFirstColor) / 255f,

cameraview/src/main/java/com/otaliastudios/cameraview/filters/FillLightFilter.java

@@ -95,7 +95,7 @@ public class FillLightFilter extends BaseFilter implements OneParameterFilter {
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         float amount = 1.0f - strength;
         float multiplier = 1.0f / (amount * 0.7f + 0.3f);

cameraview/src/main/java/com/otaliastudios/cameraview/filters/GammaFilter.java

@@ -83,7 +83,7 @@ public class GammaFilter extends BaseFilter implements OneParameterFilter {
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         GLES20.glUniform1f(gammaLocation, gamma);
         GlUtils.checkError("glUniform1f");

cameraview/src/main/java/com/otaliastudios/cameraview/filters/GrainFilter.java

@@ -138,7 +138,7 @@ public class GrainFilter extends BaseFilter implements OneParameterFilter {
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         GLES20.glUniform1f(strengthLocation, strength);
         GlUtils.checkError("glUniform1f");

cameraview/src/main/java/com/otaliastudios/cameraview/filters/HueFilter.java

@@ -96,7 +96,7 @@ public class HueFilter extends BaseFilter implements OneParameterFilter {
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         // map it on 360 degree circle
         float shaderHue = ((hue - 45) / 45f + 0.5f) * -1;

cameraview/src/main/java/com/otaliastudios/cameraview/filters/LomoishFilter.java

@@ -141,7 +141,7 @@ public class LomoishFilter extends BaseFilter {
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         float[] scale = new float[2];
         if (width > height) {

cameraview/src/main/java/com/otaliastudios/cameraview/filters/SaturationFilter.java

@@ -106,7 +106,7 @@ public class SaturationFilter extends BaseFilter implements OneParameterFilter {
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         if (scale > 0.0f) {
             GLES20.glUniform1f(scaleLocation, 0F);

cameraview/src/main/java/com/otaliastudios/cameraview/filters/SharpnessFilter.java

@@ -116,7 +116,7 @@ public class SharpnessFilter extends BaseFilter implements OneParameterFilter {
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         GLES20.glUniform1f(scaleLocation, scale);
         GlUtils.checkError("glUniform1f");

cameraview/src/main/java/com/otaliastudios/cameraview/filters/TemperatureFilter.java

@@ -94,7 +94,7 @@ public class TemperatureFilter extends BaseFilter implements OneParameterFilter
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         GLES20.glUniform1f(scaleLocation, scale);
         GlUtils.checkError("glUniform1f");

cameraview/src/main/java/com/otaliastudios/cameraview/filters/TintFilter.java

@@ -91,7 +91,7 @@ public class TintFilter extends BaseFilter implements OneParameterFilter {
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         float[] channels = new float[]{
                 Color.red(tint) / 255f,

cameraview/src/main/java/com/otaliastudios/cameraview/filters/VignetteFilter.java

@@ -145,7 +145,7 @@ public class VignetteFilter extends BaseFilter implements TwoParameterFilter {
     }
 
     @Override
-    protected void onPreDraw(long timestampUs, float[] transformMatrix) {
+    protected void onPreDraw(long timestampUs, @NonNull float[] transformMatrix) {
         super.onPreDraw(timestampUs, transformMatrix);
         float[] scale = new float[2];
         if (mWidth > mHeight) {

cameraview/src/main/java/com/otaliastudios/cameraview/frame/ByteBufferFrameManager.java

@@ -4,6 +4,7 @@ package com.otaliastudios.cameraview.frame;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
+import com.otaliastudios.cameraview.engine.offset.Angles;
 import com.otaliastudios.cameraview.size.Size;
 
 import java.util.concurrent.LinkedBlockingQueue;
@@ -21,14 +22,14 @@ import java.util.concurrent.LinkedBlockingQueue;
  *
  * 1. {@link #BUFFER_MODE_DISPATCH}: in this mode, as soon as we have a buffer, it is dispatched to
  *    the {@link BufferCallback}. The callback should then fill the buffer, and finally call
- *    {@link FrameManager#getFrame(Object, long, int)} to receive a frame.
+ *    {@link FrameManager#getFrame(Object, long)} to receive a frame.
  *    This is used for Camera1.
  *
  * 2. {@link #BUFFER_MODE_ENQUEUE}: in this mode, the manager internally keeps a queue of byte
  *    buffers, instead of handing them to the callback. The users can ask for buffers through
  *    {@link #getBuffer()}.
  *    This buffer can be filled with data and used to get a frame
- *    {@link FrameManager#getFrame(Object, long, int)}, or, in case it was not filled, returned to
+ *    {@link FrameManager#getFrame(Object, long)}, or, in case it was not filled, returned to
  *    the queue using {@link #onBufferUnused(byte[])}.
  *    This is used for Camera2.
  */
@@ -60,7 +61,7 @@ public class ByteBufferFrameManager extends FrameManager<byte[]> {
 
     /**
      * Construct a new frame manager.
-     * The construction must be followed by an {@link #setUp(int, Size)} call
+     * The construction must be followed by an {@link FrameManager#setUp(int, Size, Angles)} call
      * as soon as the parameters are known.
      *
      * @param poolSize the size of the backing pool.
@@ -79,8 +80,8 @@ public class ByteBufferFrameManager extends FrameManager<byte[]> {
 
 
     @Override
-    public void setUp(int format, @NonNull Size size) {
+    public void setUp(int format, @NonNull Size size, @NonNull Angles angles) {
-        super.setUp(format, size);
+        super.setUp(format, size, angles);
         int bytes = getFrameBytes();
         for (int i = 0; i < getPoolSize(); i++) {
             if (mBufferMode == BUFFER_MODE_DISPATCH) {
@@ -97,7 +98,7 @@ public class ByteBufferFrameManager extends FrameManager<byte[]> {
      * manager also holds a queue of the byte buffers.
      *
      * If not null, the buffer returned by this method can be filled and used to get
-     * a new frame through {@link FrameManager#getFrame(Object, long, int)}.
+     * a new frame through {@link FrameManager#getFrame(Object, long)}.
      *
      * @return a buffer, or null
      */

cameraview/src/main/java/com/otaliastudios/cameraview/frame/Frame.java

@@ -22,7 +22,8 @@ public class Frame {
     private Object mData = null;
     private long mTime = -1;
     private long mLastTime = -1;
-    private int mRotation = 0;
+    private int mUserRotation = 0;
+    private int mViewRotation = 0;
     private Size mSize = null;
     private int mFormat = -1;
 
@@ -31,13 +32,15 @@ public class Frame {
         mDataClass = manager.getFrameDataClass();
     }
 
-    void setContent(@NonNull Object data, long time, int rotation, @NonNull Size size, int format) {
+    void setContent(@NonNull Object data, long time, int userRotation, int viewRotation,
-        this.mData = data;
+                    @NonNull Size size, int format) {
-        this.mTime = time;
+        mData = data;
-        this.mLastTime = time;
+        mTime = time;
-        this.mRotation = rotation;
+        mLastTime = time;
-        this.mSize = size;
+        mUserRotation = userRotation;
-        this.mFormat = format;
+        mViewRotation = viewRotation;
+        mSize = size;
+        mFormat = format;
     }
 
     @SuppressWarnings("BooleanMethodIsAlwaysInverted")
@@ -75,7 +78,7 @@ public class Frame {
         Frame other = new Frame(mManager);
         //noinspection unchecked
         Object data = mManager.cloneFrameData(getData());
-        other.setContent(data, mTime, mRotation, mSize, mFormat);
+        other.setContent(data, mTime, mUserRotation, mViewRotation, mSize, mFormat);
         return other;
     }
 
@@ -88,7 +91,8 @@ public class Frame {
         LOG.v("Frame with time", mTime, "is being released.");
         Object data = mData;
         mData = null;
-        mRotation = 0;
+        mUserRotation = 0;
+        mViewRotation = 0;
         mTime = -1;
         mSize = null;
         mFormat = -1;
@@ -133,16 +137,36 @@ public class Frame {
         return mTime;
     }
 
+    /**
+     * @deprecated use {@link #getRotationToUser()} instead
+     */
+    @Deprecated
+    public int getRotation() {
+        return getRotationToUser();
+    }
+
     /**
      * Returns the clock-wise rotation that should be applied on the data
      * array, such that the resulting frame matches what the user is seeing
-     * on screen.
+     * on screen. Knowing this can help in the processing phase.
      *
      * @return clock-wise rotation
      */
-    public int getRotation() {
+    public int getRotationToUser() {
+        ensureHasContent();
+        return mUserRotation;
+    }
+
+    /**
+     * Returns the clock-wise rotation that should be applied on the data
+     * array, such that the resulting frame matches the View / Activity orientation.
+     * Knowing this can help in the drawing / rendering phase.
+     *
+     * @return clock-wise rotation
+     */
+    public int getRotationToView() {
         ensureHasContent();
-        return mRotation;
+        return mViewRotation;
     }
 
     /**

cameraview/src/main/java/com/otaliastudios/cameraview/frame/FrameManager.java

@@ -4,6 +4,9 @@ package com.otaliastudios.cameraview.frame;
 import android.graphics.ImageFormat;
 
 import com.otaliastudios.cameraview.CameraLogger;
+import com.otaliastudios.cameraview.engine.offset.Angles;
+import com.otaliastudios.cameraview.engine.offset.Axis;
+import com.otaliastudios.cameraview.engine.offset.Reference;
 import com.otaliastudios.cameraview.size.Size;
 
 import androidx.annotation.NonNull;
@@ -16,9 +19,9 @@ import java.util.concurrent.LinkedBlockingQueue;
  * The FrameManager keeps a {@link #mPoolSize} integer that defines the number of instances to keep.
  *
  * Main methods are:
- * - {@link #setUp(int, Size)}: to set up with size and allocate buffers
+ * - {@link #setUp(int, Size, Angles)}: to set up with size and allocate buffers
  * - {@link #release()}: to release. After release, a manager can be setUp again.
- * - {@link #getFrame(Object, long, int)}: gets a new {@link Frame}.
+ * - {@link #getFrame(Object, long)}: gets a new {@link Frame}.
  *
  * For frames to get back to the FrameManager pool, all you have to do
  * is call {@link Frame#release()} when done.
@@ -34,11 +37,12 @@ public abstract class FrameManager<T> {
     private int mFrameFormat = -1;
     private final Class<T> mFrameDataClass;
     private LinkedBlockingQueue<Frame> mFrameQueue;
+    private Angles mAngles;
 
 
     /**
      * Construct a new frame manager.
-     * The construction must be followed by an {@link #setUp(int, Size)} call
+     * The construction must be followed by an {@link #setUp(int, Size, Angles)} call
      * as soon as the parameters are known.
      *
      * @param poolSize the size of the backing pool.
@@ -80,11 +84,11 @@ public abstract class FrameManager<T> {
      * the preview size and the image format value are known.
      *
      * This method can be called again after {@link #release()} has been called.
-     *
+     *  @param format the image format
-     * @param format the image format
      * @param size the frame size
+     * @param angles angle object
      */
-    public void setUp(int format, @NonNull Size size) {
+    public void setUp(int format, @NonNull Size size, @NonNull Angles angles) {
         if (isSetUp()) {
             // TODO throw or just reconfigure?
         }
@@ -96,10 +100,11 @@ public abstract class FrameManager<T> {
         for (int i = 0; i < getPoolSize(); i++) {
             mFrameQueue.offer(new Frame(this));
         }
+        mAngles = angles;
     }
 
     /**
-     * Returns true after {@link #setUp(int, Size)}
+     * Returns true after {@link #setUp(int, Size, Angles)}
      * but before {@link #release()}.
      * Returns false otherwise.
      *
@@ -111,16 +116,15 @@ public abstract class FrameManager<T> {
 
     /**
      * Returns a new Frame for the given data. This must be called
-     * - after {@link #setUp(int, Size)}, which sets the buffer size
+     * - after {@link #setUp(int, Size, Angles)}, which sets the buffer size
      * - after the T data has been filled
      *
      * @param data data
      * @param time timestamp
-     * @param rotation rotation
      * @return a new frame
      */
     @Nullable
-    public Frame getFrame(@NonNull T data, long time, int rotation) {
+    public Frame getFrame(@NonNull T data, long time) {
         if (!isSetUp()) {
             throw new IllegalStateException("Can't call getFrame() after releasing " +
                     "or before setUp.");
@@ -129,7 +133,11 @@ public abstract class FrameManager<T> {
         Frame frame = mFrameQueue.poll();
         if (frame != null) {
             LOG.v("getFrame for time:", time, "RECYCLING.");
-            frame.setContent(data, time, rotation, mFrameSize, mFrameFormat);
+            int userRotation = mAngles.offset(Reference.SENSOR, Reference.OUTPUT,
+                    Axis.RELATIVE_TO_SENSOR);
+            int viewRotation = mAngles.offset(Reference.SENSOR, Reference.VIEW,
+                    Axis.RELATIVE_TO_SENSOR);
+            frame.setContent(data, time, userRotation, viewRotation, mFrameSize, mFrameFormat);
             return frame;
         } else {
             LOG.i("getFrame for time:", time, "NOT AVAILABLE.");
@@ -183,5 +191,6 @@ public abstract class FrameManager<T> {
         mFrameBytes = -1;
         mFrameSize = null;
         mFrameFormat = -1;
+        mAngles = null;
     }
 }

cameraview/src/main/java/com/otaliastudios/cameraview/picture/Snapshot1PictureRecorder.java

@@ -81,7 +81,7 @@ public class Snapshot1PictureRecorder extends SnapshotPictureRecorder {
                 // It seems that the buffers are already cleared here, so we need to allocate again.
                 camera.setPreviewCallbackWithBuffer(null); // Release anything left
                 camera.setPreviewCallbackWithBuffer(mEngine1); // Add ourselves
-                mEngine1.getFrameManager().setUp(mFormat, previewStreamSize);
+                mEngine1.getFrameManager().setUp(mFormat, previewStreamSize, mEngine1.getAngles());
             }
         });
     }

cameraview/src/test/java/com/otaliastudios/cameraview/frame/FrameTest.java

@@ -46,19 +46,19 @@ public class FrameTest {
         // Only time should count.
         Frame f1 = new Frame(manager);
         long time = 1000;
-        f1.setContent("foo", time, 90, new Size(5, 5), ImageFormat.NV21);
+        f1.setContent("foo", time, 90, 180, new Size(5, 5), ImageFormat.NV21);
         Frame f2 = new Frame(manager);
-        f2.setContent("bar", time, 0, new Size(10, 10), ImageFormat.NV21);
+        f2.setContent("bar", time, 0, 90, new Size(10, 10), ImageFormat.NV21);
         assertEquals(f1, f2);
 
-        f2.setContent("foo", time + 1, 0, new Size(10, 10), ImageFormat.NV21);
+        f2.setContent("foo", time + 1, 0, 90, new Size(10, 10), ImageFormat.NV21);
         assertNotEquals(f1, f2);
     }
 
     @Test
     public void testReleaseThrows() {
         final Frame frame = new Frame(manager);
-        frame.setContent("foo", 1000, 90, new Size(10, 10), ImageFormat.NV21);
+        frame.setContent("foo", 1000, 90, 90, new Size(10, 10), ImageFormat.NV21);
         frame.release();
         verify(manager, times(1)).onFrameReleased(frame, "foo");
 
@@ -83,22 +83,25 @@ public class FrameTest {
         Frame frame = new Frame(manager);
         String data = "test data";
         long time = 1000;
-        int rotation = 90;
+        int userRotation = 90;
+        int viewRotation = 90;
         Size size = new Size(10, 10);
         int format = ImageFormat.NV21;
-        frame.setContent(data, time, rotation, size, format);
+        frame.setContent(data, time, userRotation, viewRotation, size, format);
 
         Frame frozen = frame.freeze();
         assertEquals(data, frozen.getData());
         assertEquals(time, frozen.getTime());
-        assertEquals(rotation, frozen.getRotation());
+        assertEquals(userRotation, frozen.getRotationToUser());
+        assertEquals(viewRotation, frozen.getRotationToView());
         assertEquals(size, frozen.getSize());
 
         // Mutate the first, ensure that frozen is not affected
-        frame.setContent("new data", 50, 180, new Size(1, 1), ImageFormat.JPEG);
+        frame.setContent("new data", 50, 180, 180, new Size(1, 1), ImageFormat.JPEG);
         assertEquals(data, frozen.getData());
         assertEquals(time, frozen.getTime());
-        assertEquals(rotation, frozen.getRotation());
+        assertEquals(userRotation, frozen.getRotationToUser());
+        assertEquals(viewRotation, frozen.getRotationToView());
         assertEquals(size, frozen.getSize());
         assertEquals(format, frozen.getFormat());
     }

docs/_docs/frame-processing.md

@@ -16,10 +16,11 @@ cameraView.addFrameProcessor(new FrameProcessor() {
     @Override
     @WorkerThread
     public void process(@NonNull Frame frame) {
-        int rotation = frame.getRotation();
         long time = frame.getTime();
         Size size = frame.getSize();
         int format = frame.getFormat();
+        int userRotation = frame.getRotationToUser();
+        int viewRotation = frame.getRotationToView();
         if (frame.getDataClass() == byte[].class) {
             byte[] data = frame.getData();
             // Process byte array...
@@ -173,7 +174,8 @@ cameraView.setFrameProcessingPoolSize(3);
 |`frame.getDataClass()`|`Class<T>`|The class of the data returned by `getData()`. Either `byte[]` or `android.media.Image`.|
 |`frame.getData()`|`T`|The current preview frame, in its original orientation.|
 |`frame.getTime()`|`long`|The preview timestamp, in `System.currentTimeMillis()` reference.|
-|`frame.getRotation()`|`int`|The rotation that should be applied to the byte array in order to see what the user sees.|
+|`frame.getRotationToUser()`|`int`|The rotation that should be applied to the byte array in order to see what the user sees. Can be useful in the processing phase.|
+|`frame.getRotationToView()`|`int`|The rotation that should be applied to the byte array in order to match the View / Activity orientation. Can be useful in the drawing / rendering phase.|
 |`frame.getSize()`|`Size`|The frame size, before any rotation is applied, to access data.|
 |`frame.getFormat()`|`int`|The frame `ImageFormat`. Defaults to `ImageFormat.NV21` for Camera1 and `ImageFormat.YUV_420_888` for Camera2.|
 |`frame.freeze()`|`Frame`|Clones this frame and makes it immutable. Can be expensive because requires copying the byte array.|