AutoFitTextureView.java

package net.trippedout.android.shadercamera.view;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.TextureView;

/**
 * TODO - figure out why the fuck we really need to do this.
 * Code originally taken from Camera2 api samples on github/googlesamples
 */
public class AutoFitTextureView extends TextureView
{
    private static final String TAG = AutoFitTextureView.class.getSimpleName();

    private int mRatioWidth = 0;
    private int mRatioHeight = 0;

    public AutoFitTextureView(Context context) {
        this(context, null);
    }

    public AutoFitTextureView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public AutoFitTextureView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    /**
     * Sets the aspect ratio for this view. The size of the view will be measured based on the ratio
     * calculated from the parameters. Note that the actual sizes of parameters don't matter, that
     * is, calling setAspectRatio(2, 3) and setAspectRatio(4, 6) make the same result.
     *
     * @param width  Relative horizontal size
     * @param height Relative vertical size
     */
    public void setAspectRatio(int width, int height) {
        if (width < 0 || height < 0) {
            throw new IllegalArgumentException("Size cannot be negative.");
        }
//        Log.d(TAG, "setAspectRatio() " + width + ", " + height);

        mRatioWidth = width;
        mRatioHeight = height;
        requestLayout();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        int width = MeasureSpec.getSize(widthMeasureSpec);
        int height = MeasureSpec.getSize(heightMeasureSpec);

        setMeasuredDimension(width, width); // keep square

//        if (0 == mRatioWidth || 0 == mRatioHeight) {
//            setMeasuredDimension(width, height);
//        } else {
//            if (width < height * mRatioWidth / mRatioHeight) {
//                setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
//            } else {
//                setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
//            }
//        }
    }
}