Renders openCV's camera in portrait mode on android - to be placed in `CameraBridgeViewBase.java`

openCV-portait-camera-android.java

private final Matrix mMatrix = new Matrix();

private void updateMatrix() {
    float mw = this.getWidth();
    float mh = this.getHeight();

    float hw = this.getWidth() / 2.0f;
    float hh = this.getHeight() / 2.0f;

    float cw  = (float)Resources.getSystem().getDisplayMetrics().widthPixels; //Make sure to import Resources package
    float ch  = (float)Resources.getSystem().getDisplayMetrics().heightPixels;

    float scale = cw / (float)mh;
    float scale2 = ch / (float)mw;
    if(scale2 > scale){
        scale = scale2;
    }

    boolean isFrontCamera = mCameraIndex == CAMERA_ID_FRONT;

    mMatrix.reset();
    if (isFrontCamera) {
        mMatrix.preScale(-1, 1, hw, hh); //MH - this will mirror the camera
    }
    mMatrix.preTranslate(hw, hh);
    if (isFrontCamera){
        mMatrix.preRotate(270);
    } else {
        mMatrix.preRotate(90);
    }
    mMatrix.preTranslate(-hw, -hh);
    mMatrix.preScale(scale,scale,hw,hh);
}

@Override
public void layout(int l, int t, int r, int b) {
    super.layout(l, t, r, b);
    updateMatrix();
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    updateMatrix();
}

/**
* This method shall be called by the subclasses when they have valid
* object and want it to be delivered to external client (via callback) and
* then displayed on the screen.
* @param frame - the current frame to be delivered
*/
protected void deliverAndDrawFrame(CvCameraViewFrame frame) { //replaces existing deliverAndDrawFrame
    Mat modified;

    if (mListener != null) {
        modified = mListener.onCameraFrame(frame);
    } else {
        modified = frame.rgba();
    }

    boolean bmpValid = true;
    if (modified != null) {
        try {
            Utils.matToBitmap(modified, mCacheBitmap);
        } catch(Exception e) {
            Log.e(TAG, "Mat type: " + modified);
            Log.e(TAG, "Bitmap type: " + mCacheBitmap.getWidth() + "*" + mCacheBitmap.getHeight());
            Log.e(TAG, "Utils.matToBitmap() throws an exception: " + e.getMessage());
            bmpValid = false;
        }
    }

    if (bmpValid && mCacheBitmap != null) {
        Canvas canvas = getHolder().lockCanvas();
        if (canvas != null) {
            canvas.drawColor(0, android.graphics.PorterDuff.Mode.CLEAR);
            int saveCount = canvas.save();
            canvas.setMatrix(mMatrix);

            if (mScale != 0) {
                canvas.drawBitmap(mCacheBitmap, new Rect(0,0,mCacheBitmap.getWidth(), mCacheBitmap.getHeight()),
                        new Rect((int)((canvas.getWidth() - mScale*mCacheBitmap.getWidth()) / 2),
                                (int)((canvas.getHeight() - mScale*mCacheBitmap.getHeight()) / 2),
                                (int)((canvas.getWidth() - mScale*mCacheBitmap.getWidth()) / 2 + mScale*mCacheBitmap.getWidth()),
                                (int)((canvas.getHeight() - mScale*mCacheBitmap.getHeight()) / 2 + mScale*mCacheBitmap.getHeight())), null);
            } else {
                canvas.drawBitmap(mCacheBitmap, new Rect(0,0,mCacheBitmap.getWidth(), mCacheBitmap.getHeight()),
                        new Rect((canvas.getWidth() - mCacheBitmap.getWidth()) / 2,
                                (canvas.getHeight() - mCacheBitmap.getHeight()) / 2,
                                (canvas.getWidth() - mCacheBitmap.getWidth()) / 2 + mCacheBitmap.getWidth(),
                                (canvas.getHeight() - mCacheBitmap.getHeight()) / 2 + mCacheBitmap.getHeight()), null);
            }

            //Restore canvas after draw bitmap
            canvas.restoreToCount(saveCount);

            if (mFpsMeter != null) {
                mFpsMeter.measure();
                mFpsMeter.draw(canvas, 20, 30);
            }
            getHolder().unlockCanvasAndPost(canvas);
        }
    }
}

awsome!

Thank you very much! <3 <3 <3

You are an absolute legend for fixing this. Thank you.