/// <summary>
/// Rotate via EXIF information
/// </summary>
/// <param name="photoPath"></param>
/// <returns></returns>
public byte[] RotateImage(string photoPath)
{
Android.Graphics.BitmapFactory.Options options = new Android.Graphics.BitmapFactory.Options();
options.InPreferredConfig = Android.Graphics.Bitmap.Config.Argb8888;
Android.Graphics.Bitmap bitmap = Android.Graphics.BitmapFactory.DecodeFile(photoPath, options);
try
{
Android.Media.ExifInterface exifInterface = new Android.Media.ExifInterface(photoPath);
int orientation = exifInterface.GetAttributeInt(Android.Media.ExifInterface.TagOrientation, (int)Android.Media.Orientation.Normal);
int rotate = 0;
switch (orientation)
{
case (int)Android.Media.Orientation.Normal:
rotate = 0;
break;
case (int)Android.Media.Orientation.Rotate90:
rotate = 90;
break;
case (int)Android.Media.Orientation.Rotate270:
rotate = 270;
break;
case (int)Android.Media.Orientation.Rotate180:
rotate = 180;
break;
default:
rotate = 0;
break;
}
using (var ms = new System.IO.MemoryStream())
{
Android.Graphics.Bitmap croppedBitmap = null;
Android.Graphics.Matrix mtx = new Android.Graphics.Matrix();
mtx.PreRotate(rotate);
if (bitmap.Width >= bitmap.Height)
{
croppedBitmap = Android.Graphics.Bitmap.CreateBitmap(
bitmap,
bitmap.Width / 2 - bitmap.Height / 2,
0,
bitmap.Height,
bitmap.Height,
mtx,
false);
}
else
{
croppedBitmap = Android.Graphics.Bitmap.CreateBitmap(
bitmap,
0,
bitmap.Height / 2 - bitmap.Width / 2,
bitmap.Width,
bitmap.Width,
mtx,
false);
}
croppedBitmap.Compress(Android.Graphics.Bitmap.CompressFormat.Png, 100, ms);
croppedBitmap.Recycle();
croppedBitmap.Dispose();
croppedBitmap = null;
mtx.Dispose();
mtx = null;
bitmap.Recycle();
bitmap.Dispose();
bitmap = null;
return(ms.ToArray());
}
}
catch
{
// <!-- Fail out -->
}
return(null);
}
/// <summary>
/// Take a picture and perform previews
/// </summary>
/// <param name="data"></param>
/// <param name="camera"></param>
void Camera.IPictureCallback.OnPictureTaken(byte[] data, Android.Hardware.Camera camera)
{
if (data != null && _box != null)
{
if (!_processDialog.IsShowing) {
_processDialog.SetMessage ("Waiting for image results...");
_processDialog.Show ();
}
Android.Graphics.BitmapFactory.Options options = new Android.Graphics.BitmapFactory.Options ();
options.InJustDecodeBounds = true;
options.InSampleSize = 2;
options.InJustDecodeBounds = false;
options.InTempStorage = new byte[16 * 1024];
Android.Graphics.Bitmap bmp = Android.Graphics.BitmapFactory.DecodeByteArray(data, 0, data.Length, options);
data = null;
GC.Collect ();
Android.Graphics.Bitmap rotatedBitmap;
if (bmp.Width > bmp.Height)
{
Android.Graphics.Matrix mtx = new Android.Graphics.Matrix();
mtx.SetRotate(90);
rotatedBitmap = Android.Graphics.Bitmap.CreateBitmap(bmp, 0, 0, bmp.Width, bmp.Height, mtx, false);
bmp.Recycle();
mtx.Dispose();
mtx = null;
}
else
{
rotatedBitmap = bmp.Copy(bmp.GetConfig(), true);
bmp.Recycle();
}
GC.Collect ();
double ratioX = (double)rotatedBitmap.Width / (double)screenWidth;
double ratioY = (double)rotatedBitmap.Height / (double)screenHeight;
int startX = (int)(ratioX * (double)(_box.MidX - _box.Width / 2));
int startY = (int)(ratioY * (double)(_box.MidY - _box.Height / 2));
int width = (int)(ratioX * (double)_box.Width);
int height = (int)(ratioY * (double)_box.Height);
Android.Graphics.Bitmap croppedBitmap = Android.Graphics.Bitmap.CreateBitmap(rotatedBitmap, startX, startY, width, height);
rotatedBitmap.Recycle();
GC.Collect ();
bitmap = croppedBitmap.Copy(croppedBitmap.GetConfig(), true);
PerformPreviews(croppedBitmap);
}
else
{
Toast.MakeText(this, "Data null error", ToastLength.Long).Show();
}
}
private Android.Graphics.Bitmap LoadAndResizeBitmap(string fileName, Size newSize)
{
var exif = new ExifInterface(fileName);
var width = exif.GetAttributeInt(ExifInterface.TagImageWidth, 100);
var height = exif.GetAttributeInt(ExifInterface.TagImageLength, 80);
var orientation = exif.GetAttribute(ExifInterface.TagOrientation);
// We calculate the ratio that we need to resize the image by
// in order to fit the requested dimensions.
var inSampleSize = 1.0;
if (newSize.Height < height || newSize.Width < width)
{
inSampleSize = newSize.Width > newSize.Height
? newSize.Height / height
: newSize.Width / width;
}
var options = new Android.Graphics.BitmapFactory.Options {
InJustDecodeBounds = false,
InSampleSize = (int)inSampleSize
};
// Now we will load the image and have BitmapFactory resize it for us.
var resizedBitmap = Android.Graphics.BitmapFactory.DecodeFile(fileName, options);
var rotate = false;
switch (orientation)
{
case "1": // landscape
case "3": // landscape
if (width < height)
{
rotate = true;
}
break;
case "8":
case "4":
case "6": // portrait
if (width > height)
{
rotate = true;
}
break;
case "0": //undefined
default:
break;
}
if (rotate)
{
var mtx = new Android.Graphics.Matrix();
mtx.PreRotate(90);
resizedBitmap = Android.Graphics.Bitmap.CreateBitmap(resizedBitmap, 0, 0, resizedBitmap.Width, resizedBitmap.Height, mtx, false);
mtx.Dispose();
mtx = null;
}
return(resizedBitmap);
}
private Android.Graphics.Bitmap LoadAndResizeBitmap(string fileName, Size newSize) {
var exif = new ExifInterface(fileName);
var width = exif.GetAttributeInt(ExifInterface.TagImageWidth, 100);
var height = exif.GetAttributeInt(ExifInterface.TagImageLength, 80);
var orientation = exif.GetAttribute(ExifInterface.TagOrientation);
// We calculate the ratio that we need to resize the image by
// in order to fit the requested dimensions.
var inSampleSize = 1.0;
if (newSize.Height < height || newSize.Width < width) {
inSampleSize = newSize.Width > newSize.Height
? newSize.Height / height
: newSize.Width / width;
}
var options = new Android.Graphics.BitmapFactory.Options {
InJustDecodeBounds = false,
InSampleSize = (int)inSampleSize
};
// Now we will load the image and have BitmapFactory resize it for us.
var resizedBitmap = Android.Graphics.BitmapFactory.DecodeFile(fileName, options);
var rotate = false;
switch (orientation) {
case "1": // landscape
case "3": // landscape
if (width < height)
rotate = true;
break;
case "8":
case "4":
case "6": // portrait
if (width > height)
rotate = true;
break;
case "0": //undefined
default:
break;
}
if (rotate) {
var mtx = new Android.Graphics.Matrix();
mtx.PreRotate(90);
resizedBitmap = Android.Graphics.Bitmap.CreateBitmap(resizedBitmap, 0, 0, resizedBitmap.Width, resizedBitmap.Height, mtx, false);
mtx.Dispose();
mtx = null;
}
return resizedBitmap;
}
