Merge "LayoutLib: fix crash when shadow size <=0." into lmp-mr1-dev

import com.android.layoutlib.bridge.impl.ResourceHelper;

import android.graphics.Canvas;

import android.graphics.Canvas_Delegate;

import android.graphics.LinearGradient;

import android.graphics.Outline;

import android.graphics.Paint;

    private static void sideShadow(Canvas canvas, Paint edgePaint,

            RectF edgeShadowRect, float dx, float dy, int rotations) {

        if (isRectEmpty(edgeShadowRect)) {

            return;

        }

        int saved = canvas.save();

        canvas.translate(dx, dy);

        canvas.rotate(rotations * PERPENDICULAR_ANGLE);

        canvas.drawPath(path, paint);

        canvas.restoreToCount(saved);

    }

    /**

     * Differs from {@link RectF#isEmpty()} as this first converts the rect to int and then checks.

     * <p/>

     * This is required because {@link Canvas_Delegate#native_drawRect(long, float, float, float,

     * float, long)} casts the co-ordinates to int and we want to ensure that it doesn't end up

     * drawing empty rectangles, which results in IllegalArgumentException.

     */

    private static boolean isRectEmpty(RectF rect) {

        return (int) rect.left >= (int) rect.right || (int) rect.top >= (int) rect.bottom;

    }

}