/**
* Update preview TextureView rotation to accommodate discrepancy between preview buffer and the
* view window orientation.
*
* <p>Assumptions: - Aspect ratio for the sensor buffers is in landscape orientation, - Dimensions
* of buffers received are rotated to the natural device orientation. - The contents of each
* buffer are rotated by the inverse of the display rotation. - Surface scales the buffer to fit
* the current view bounds. TODO: Make this method works for all orientations
*/
protected void updatePreviewDisplayRotation(Size previewSize, TextureView textureView) {
int rotationDegrees = 0;
Camera2MultiViewCtsActivity activity = (Camera2MultiViewCtsActivity) mContext;
int displayRotation = activity.getWindowManager().getDefaultDisplay().getRotation();
Configuration config = activity.getResources().getConfiguration();
// Get UI display rotation
switch (displayRotation) {
case Surface.ROTATION_0:
rotationDegrees = 0;
break;
case Surface.ROTATION_90:
rotationDegrees = 90;
break;
case Surface.ROTATION_180:
rotationDegrees = 180;
break;
case Surface.ROTATION_270:
rotationDegrees = 270;
break;
}
// Get device natural orientation
int deviceOrientation = Configuration.ORIENTATION_PORTRAIT;
if ((rotationDegrees % 180 == 0 && config.orientation == Configuration.ORIENTATION_LANDSCAPE)
|| ((rotationDegrees % 180 != 0
&& config.orientation == Configuration.ORIENTATION_PORTRAIT))) {
deviceOrientation = Configuration.ORIENTATION_LANDSCAPE;
}
// Rotate the buffer dimensions if device orientation is portrait.
int effectiveWidth = previewSize.getWidth();
int effectiveHeight = previewSize.getHeight();
if (deviceOrientation == Configuration.ORIENTATION_PORTRAIT) {
effectiveWidth = previewSize.getHeight();
effectiveHeight = previewSize.getWidth();
}
// Find and center view rect and buffer rect
Matrix transformMatrix = textureView.getTransform(null);
int viewWidth = textureView.getWidth();
int viewHeight = textureView.getHeight();
RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
RectF bufRect = new RectF(0, 0, effectiveWidth, effectiveHeight);
float centerX = viewRect.centerX();
float centerY = viewRect.centerY();
bufRect.offset(centerX - bufRect.centerX(), centerY - bufRect.centerY());
// Undo ScaleToFit.FILL done by the surface
transformMatrix.setRectToRect(viewRect, bufRect, Matrix.ScaleToFit.FILL);
// Rotate buffer contents to proper orientation
transformMatrix.postRotate((360 - rotationDegrees) % 360, centerX, centerY);
if ((rotationDegrees % 180) == 90) {
int temp = effectiveWidth;
effectiveWidth = effectiveHeight;
effectiveHeight = temp;
}
// Scale to fit view, cropping the longest dimension
float scale =
Math.max(viewWidth / (float) effectiveWidth, viewHeight / (float) effectiveHeight);
transformMatrix.postScale(scale, scale, centerX, centerY);
Handler handler = new Handler(Looper.getMainLooper());
class TransformUpdater implements Runnable {
TextureView mView;
Matrix mTransformMatrix;
TransformUpdater(TextureView view, Matrix matrix) {
mView = view;
mTransformMatrix = matrix;
}
@Override
public void run() {
mView.setTransform(mTransformMatrix);
}
}
handler.post(new TransformUpdater(textureView, transformMatrix));
}
