When change from narrow screen to wide screen, we will

        // update mMinZoomScale if the minimum zoom scale is not fixed

        if (!mMinZoomScaleFixed) {

            mMinZoomScale = (float) getViewWidth()

            // when change from narrow screen to wide screen, the new viewWidth

            // can be wider than the old content width. We limit the minimum

            // scale to 1.0f. The proper minimum scale will be calculated when

            // the new picture shows up.

            mMinZoomScale = Math.min(1.0f, (float) getViewWidth()

                    / (mDrawHistory ? mHistoryPicture.getWidth()

                            : mZoomOverviewWidth);

                            : mZoomOverviewWidth));

        }

        // we always force, in case our height changed, in which case we still