private void startIfReady()
{
if (this.mStartRequested && this.mSurfaceAvailable)
{
this.mLensEngine.Run(this.mSurfaceView.Holder);
if (this.mOverlay != null)
{
Huawei.Hms.Common.Size.Size size = this.mLensEngine.DisplayDimension;
int min = Math.Min(640, 480);
int max = Math.Max(640, 480);
if (this.isPortraitMode())
{
// Swap width and height sizes when in portrait, since it will be rotated by 90 degrees.
this.mOverlay.SetCameraInfo(min, max, this.mLensEngine.LensType);
}
else
{
this.mOverlay.SetCameraInfo(max, min, this.mLensEngine.LensType);
}
this.mOverlay.Clear();
}
this.mStartRequested = false;
}
}
protected override void OnLayout(bool changed, int l, int t, int r, int b)
{
int previewWidth = 480;
int previewHeight = 360;
if (this.mLensEngine != null)
{
Huawei.Hms.Common.Size.Size size = this.mLensEngine.DisplayDimension;
if (size != null)
{
previewWidth = 640;
previewHeight = 480;
}
}
// Swap width and height sizes when in portrait, since it will be rotated 90 degrees
if (this.isPortraitMode())
{
int tmp = previewWidth;
previewWidth = previewHeight;
previewHeight = tmp;
}
int viewWidth = r - l;
int viewHeight = b - t;
int childWidth;
int childHeight;
int childXOffset = 0;
int childYOffset = 0;
float widthRatio = (float)viewWidth / (float)previewWidth;
float heightRatio = (float)viewHeight / (float)previewHeight;
// To fill the view with the camera preview, while also preserving the correct aspect ratio,
// it is usually necessary to slightly oversize the child and to crop off portions along one
// of the dimensions. We scale up based on the dimension requiring the most correction, and
// compute a crop offset for the other dimension.
if (widthRatio > heightRatio)
{
childWidth = viewWidth;
childHeight = (int)((float)previewHeight * widthRatio);
childYOffset = (childHeight - viewHeight) / 2;
}
else
{
childWidth = (int)((float)previewWidth * heightRatio);
childHeight = viewHeight;
childXOffset = (childWidth - viewWidth) / 2;
}
for (int i = 0; i < this.ChildCount; ++i)
{
// One dimension will be cropped. We shift child over or up by this offset and adjust
// the size to maintain the proper aspect ratio.
this.GetChildAt(i).Layout(-1 * childXOffset, -1 * childYOffset, childWidth - childXOffset,
childHeight - childYOffset);
}
try
{
this.startIfReady();
}
catch (Exception e)
{
Log.Info(LensEnginePreview.Tag, "Could not start camera source.", e);
}
}
