// Scale the image down for faster face detection.
private Bitmap PrepareBitmap()
{
EmCropImage eci = this.ECI;
if (eci == null)
{
return(null);
}
if (eci.Bitmap == null || eci.Bitmap.IsRecycled)
{
return(null);
}
// 256 pixels wide is enough.
if (eci.Bitmap.Width > 256)
{
this.Scale = 256.0F / eci.Bitmap.Width;
}
Matrix matrix = new Matrix();
matrix.SetScale(this.Scale, this.Scale);
Bitmap faceBitmap = Bitmap.CreateBitmap(eci.Bitmap, 0, 0, eci.Bitmap
.Width, eci.Bitmap.Height, matrix, true);
return(faceBitmap);
}
// For each face, we create a HightlightView for it.
private void HandleFace(FaceDetector.Face f)
{
EmCropImage eci = this.ECI;
if (eci == null)
{
return;
}
PointF midPoint = new PointF();
int r = ((int)(f.EyesDistance() * this.Scale)) * 2;
f.GetMidPoint(midPoint);
midPoint.X *= this.Scale;
midPoint.Y *= this.Scale;
int midX = (int)midPoint.X;
int midY = (int)midPoint.Y;
EmHighlightView hv = new EmHighlightView(eci.ImageView, eci.MOutlineColor, eci.MOutlineCircleColor);
int width = eci.Bitmap.Width;
int height = eci.Bitmap.Height;
Rect imageRect = new Rect(0, 0, width, height);
RectF faceRect = new RectF(midX, midY, midX, midY);
faceRect.Inset(-r, -r);
if (faceRect.Left < 0)
{
faceRect.Inset(-faceRect.Left, -faceRect.Left);
}
if (faceRect.Top < 0)
{
faceRect.Inset(-faceRect.Top, -faceRect.Top);
}
if (faceRect.Right > imageRect.Right)
{
faceRect.Inset(faceRect.Right - imageRect.Right, faceRect.Right - imageRect.Right);
}
if (faceRect.Bottom > imageRect.Bottom)
{
faceRect.Inset(faceRect.Bottom - imageRect.Bottom, faceRect.Bottom - imageRect.Bottom);
}
hv.Setup(this.MImageMatrix, imageRect, faceRect, eci.CircleCropping, eci.AspectX != 0 && eci.AspectY != 0);
eci.ImageView.Add(hv);
}
private void MakeDefault()
{
EmCropImage eci = this.ECI;
if (eci == null)
{
return;
}
EmHighlightView hv = new EmHighlightView(eci.ImageView, eci.MOutlineColor, eci.MOutlineCircleColor);
int width = eci.Bitmap.Width;
int height = eci.Bitmap.Height;
Rect imageRect = new Rect(0, 0, width, height);
// make the default size about 4/5 of the width or height
int cropWidth = Java.Lang.Math.Min(width, height) * 4 / 5;
int cropHeight = cropWidth;
if (eci.AspectX != 0 && eci.AspectY != 0)
{
if (eci.AspectX > eci.AspectY)
{
cropHeight = cropWidth * eci.AspectY / eci.AspectX;
}
else
{
cropWidth = cropHeight * eci.AspectX / eci.AspectY;
}
}
int x = (width - cropWidth) / 2;
int y = (height - cropHeight) / 2;
RectF cropRect = new RectF(x, y, x + cropWidth, y + cropHeight);
hv.Setup(this.MImageMatrix, imageRect, cropRect, eci.CircleCropping,
eci.AspectX != 0 && eci.AspectY != 0);
eci.ImageView.Add(hv);
}
public void Run()
{
EmCropImage eci = this.ECI;
if (eci == null)
{
return;
}
CountDownLatch latch = new CountDownLatch(1);
Bitmap b = (eci.Image != null) ? eci.Image.FullSizeBitmap(IImageConstants.Unconstrained, 1024 * 1024) : eci.Bitmap;
eci.MHandler.Post(() => {
if (b != eci.Bitmap && b != null)
{
eci.ImageView.SetImageBitmapResetBase(b, true);
eci.Bitmap.Recycle();
eci.Bitmap = b;
}
if (eci.ImageView.GetScale() == 1F)
{
eci.ImageView.Center(true, true);
}
latch.CountDown();
});
try {
latch.Await();
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
eci.FaceDetectionRunnable.Run();
}
public override bool OnTouchEvent(MotionEvent e)
{
EmCropImage cropImage = (EmCropImage)this.Context;
if (cropImage.Saving)
{
return(false);
}
switch (e.Action)
{
case MotionEventActions.Down:
{
if (cropImage.WaitingToPick)
{
RecomputeFocus(e);
}
else
{
for (int i = 0; i < this.MotionHighlightViews.Count; i++)
{
EmHighlightView hv = this.MotionHighlightViews [i];
int edge = hv.GetHit(e.GetX(), e.GetY());
if (edge != HighlightView.GrowNone)
{
this.MotionEdge = edge;
this.MotionHighlightView = hv;
this.LastX = e.GetX();
this.LastY = e.GetY();
this.MotionHighlightView.SetMode(
(edge == EmHighlightView.MOVE)
? EmHighlightView.ModifyMode.Move
: EmHighlightView.ModifyMode.Grow);
break;
}
}
}
break;
}
case MotionEventActions.Up:
{
if (cropImage.WaitingToPick)
{
for (int i = 0; i < this.MotionHighlightViews.Count; i++)
{
EmHighlightView hv = this.MotionHighlightViews [i];
if (hv.Focused)
{
cropImage.MCrop = hv;
for (int j = 0; j < this.MotionHighlightViews.Count; j++)
{
if (j == i)
{
continue;
}
this.MotionHighlightViews [j].Hidden = true;
}
CenterBasedOnHighlightView(hv);
((EmCropImage)this.Context).WaitingToPick = false;
return(true);
}
}
}
else
{
if (this.MotionHighlightView != null)
{
CenterBasedOnHighlightView(this.MotionHighlightView);
this.MotionHighlightView.SetMode(EmHighlightView.ModifyMode.None);
}
}
this.MotionHighlightView = null;
break;
}
case MotionEventActions.Move:
{
if (cropImage.WaitingToPick)
{
RecomputeFocus(e);
}
else
{
if (this.MotionHighlightView != null)
{
this.MotionHighlightView.HandleMotion(this.MotionEdge,
e.GetX() - this.LastX,
e.GetY() - this.LastY);
this.LastX = e.GetX();
this.LastY = e.GetY();
if (true)
{
// This section of code is optional. It has some user
// benefit in that moving the crop rectangle against
// the edge of the screen causes scrolling but it means
// that the crop rectangle is no longer fixed under
// the user's finger.
EnsureVisible(this.MotionHighlightView);
}
}
}
break;
}
}
switch (e.Action)
{
case MotionEventActions.Up:
{
this.Center(true, true);
break;
}
case MotionEventActions.Move:
{
if (this.GetScale() == 1f)
{
Center(true, true);
}
break;
}
}
return(true);
}
public EmCropRunnable(EmCropImage parent)
{
this.ECI = parent;
}
public EmFaceDetectionRunnable(EmCropImage parent)
{
this.ECI = parent;
}
public void Run()
{
EmCropImage eci = this.ECI;
if (eci == null)
{
return;
}
this.MImageMatrix = eci.ImageView.ImageMatrix;
Bitmap faceBitmap = PrepareBitmap();
if (faceBitmap != null)
{
this.Scale = 1.0F / this.Scale;
if (faceBitmap != null && eci.DoingFaceDetection)
{
FaceDetector detector = new FaceDetector(faceBitmap.Width,
faceBitmap.Height, this.Faces.Length);
this.NumberOfFaces = detector.FindFaces(faceBitmap, this.Faces);
}
if (faceBitmap != null && faceBitmap != eci.Bitmap)
{
faceBitmap.Recycle();
}
}
eci.MHandler.Post(() => {
eci.WaitingToPick = this.NumberOfFaces > 1;
if (this.NumberOfFaces > 0)
{
for (int i = 0; i < this.NumberOfFaces; i++)
{
HandleFace(this.Faces[i]);
}
}
else
{
MakeDefault();
}
eci.ImageView.Invalidate();
if (eci.ImageView.MotionHighlightViews.Count == 1)
{
eci.MCrop = eci.ImageView.MotionHighlightViews [0];
eci.MCrop.Focused = true;
}
// Translation Note: I have no idea how to get to this area of code.
// It has something to do with face recognition.
if (this.NumberOfFaces > 1)
{
Toast t = Toast.MakeText(eci,
"Touch a face to begin.",
ToastLength.Short);
t.Show();
}
});
}