// Operation: scale an image to the given dimensions.
public static byte[] scaleImageTo(byte[] inBytes, int outWidth, int outHeight)
{
using (StreamImage inImage = byteArrayToImage(inBytes))
{
int x, y, w, h;
int iWoH = inImage.mImage.Width * outHeight;
int iHoW = inImage.mImage.Height * outWidth;
if (iWoH < iHoW)
{
w = (int)((double)(iWoH) / inImage.mImage.Height);
h = outHeight;
x = (int)((outWidth - w) / 2.0);
y = 0;
}
else
{
w = outWidth;
h = (int)((double)(iHoW) / inImage.mImage.Width);
x = 0;
y = (int)((outHeight - h) / 2.0);
}
using (Bitmap outImage = new Bitmap(outWidth, outHeight))
{
drawImage(inImage.mImage, outImage, new Rectangle(x, y, w, h));
return(imageToByteArray(outImage));
}
}
}
// Operation: rotate an image by 90, 180, or 270 degrees.
public static byte[] rotateImage(byte[] inBytes, int rotateType)
{
RotateFlipType rotateFlipType;
switch (rotateType)
{
case 1:
rotateFlipType = RotateFlipType.Rotate90FlipNone;
break;
case 2:
rotateFlipType = RotateFlipType.Rotate180FlipNone;
break;
case 3:
rotateFlipType = RotateFlipType.Rotate270FlipNone;
break;
default:
throw new ArgumentException("Invalid type");
}
using (StreamImage inImage = byteArrayToImage(inBytes))
{
inImage.mImage.RotateFlip(rotateFlipType);
return(imageToByteArray(inImage.mImage));
}
}
// Operation: return the value of an image property (provided it's a string or integer).
// Use property ID 8298 for copyright.
// See https://msdn.microsoft.com/en-us/library/ms534416.aspx for additional IDs.
public static string getImageProperty(byte[] inBytes, int propertyId)
{
using (StreamImage inImage = byteArrayToImage(inBytes))
{
foreach (PropertyItem propItem in inImage.mImage.PropertyItems)
{
if (propItem.Id == propertyId)
{
switch (propItem.Type)
{
case 5:
return(string.Join(",", propItem.Value.Select(x => x.ToString())));
//ExifGpsToFloat(propItem)
case 2:
return(System.Text.Encoding.UTF8.GetString(propItem.Value));
default:
return($"{propItem.Type}: {propItem.Value.ToString()}");
}
}
}
}
return(null);
}
// Operation: scale an image by a scale factor.
public static byte[] scaleImageBy(byte[] inBytes, float scaleFactor)
{
using (StreamImage inImage = byteArrayToImage(inBytes))
{
int outWidth = (int)(inImage.mImage.Width * scaleFactor);
int outHeight = (int)(inImage.mImage.Height * scaleFactor);
using (Bitmap outImage = new Bitmap(outWidth, outHeight))
{
drawImage(inImage.mImage, outImage, new Rectangle(0, 0, outWidth, outHeight));
return(imageToByteArray(outImage));
}
}
}
public static string getImageGPSProperty(byte[] inBytes, int propertyId, int referencePropertyId)
{
using (StreamImage inImage = byteArrayToImage(inBytes))
{
var prop = inImage.mImage.PropertyItems.Where(x => x.Id == propertyId).Take(1);
var propRef = inImage.mImage.PropertyItems.Where(x => x.Id == referencePropertyId).Take(1);
if (!prop.Any() || !propRef.Any())
{
// abort
return(null);
}
//return ExifGpsToFloat(prop.Single(), propRef.Single()).ToString();
return(ExifGpsToDouble(propRef.Single(), prop.Single()).ToString());
}
}
