// 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: 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));
}
}
}
// 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)
{
return((propItem.Type == 2) ? System.Text.Encoding.UTF8.GetString(propItem.Value) : propItem.Value.ToString());
}
}
}
return(null);
}
public override IRow Process(IRow input, IUpdatableRow output)
{
var img = input.Get <byte[]>("image_data");
// load image only once into memory per row
using (StreamImage inImage = new StreamImage(img))
{
output.SetColumnIfExists("equipment_make", inImage.getStreamImageProperty(ImageProperties.equipment_make));
output.SetColumnIfExists("equipment_model", inImage.getStreamImageProperty(ImageProperties.equipment_model));
output.SetColumnIfExists("description", inImage.getStreamImageProperty(ImageProperties.description));
output.SetColumnIfExists("copyright", inImage.getStreamImageProperty(ImageProperties.copyright));
output.SetColumnIfExists("thumbnail", inImage.scaleStreamImageTo(150, 150));
}
return(output.AsReadOnly());
}
public override IRow Process(IRow input, IUpdatableRow output)
{
var img = input.Get<byte[]>("image_data");
// load image only once into memory per row
using (StreamImage inImage = new StreamImage(img))
{
output.SetColumnIfExists("equipment_make", inImage.getStreamImageProperty(ImageProperties.equipment_make));
output.SetColumnIfExists("equipment_model", inImage.getStreamImageProperty(ImageProperties.equipment_model));
output.SetColumnIfExists("description", inImage.getStreamImageProperty(ImageProperties.description));
output.SetColumnIfExists("copyright", inImage.getStreamImageProperty(ImageProperties.copyright));
output.SetColumnIfExists("thumbnail", inImage.scaleStreamImageTo(150, 150));
}
return output.AsReadOnly();
}
public override IEnumerable <IRow> Extract(IUnstructuredReader input, IUpdatableRow output)
{
byte[] img = ImageOps.GetByteArrayforImage(input.BaseStream);
// load image only once into memory per row
using (StreamImage inImage = new StreamImage(img))
{
output.SetColumnIfExists("image", img);
output.SetColumnIfExists("equipment_make", inImage.getStreamImageProperty(ImageProperties.equipment_make));
output.SetColumnIfExists("equipment_model", inImage.getStreamImageProperty(ImageProperties.equipment_model));
output.SetColumnIfExists("description", inImage.getStreamImageProperty(ImageProperties.description));
output.SetColumnIfExists("copyright", inImage.getStreamImageProperty(ImageProperties.copyright));
output.SetColumnIfExists("thumbnail", inImage.scaleStreamImageTo(this._scaleWidth, this._scaleHeight));
}
yield return(output.AsReadOnly());
}
