/// <summary>
/// Resizes an image represented by a stream.
///
/// </summary>
/// <param name="inputStream">The input stream.</param><param name="options">The options.</param><param name="outputFormat">The output format.</param>
/// <returns>
/// The image stream.
/// </returns>
public Stream CropImageStream(Stream inputStream, CustomTransformationOptions options, ImageFormat outputFormat)
{
Assert.ArgumentNotNull(inputStream, "inputStream");
Assert.ArgumentNotNull(options, "options");
Assert.ArgumentNotNull(outputFormat, "outputFormat");
if (inputStream.Length <= Settings.Media.MaxSizeInMemory)
{
if (options.CropRegion == null || options.CropRegion.Count() != 4)
{
return(null);
}
var stream = new MemoryStream();
var newImage = new Cropper().Crop(new Bitmap(inputStream), options, outputFormat);
newImage.Save(stream, outputFormat);
stream.Seek(0L, SeekOrigin.Begin);
newImage.Dispose();
return(stream);
}
Tracer.Error("Could not crop image stream as it was larger than the maximum size allowed for memory processing.");
return(null);
}
/// <summary>
/// Transforms an image stream.
///
/// </summary>
/// <param name="inputStream">The stream containing the media data.</param><param name="options">The image options.</param><param name="outputFormat">The image format of the resulting thumbnail image.</param>
/// <returns/>
public virtual Stream TransformImageStream(Stream inputStream, CustomTransformationOptions options, ImageFormat outputFormat)
{
Assert.ArgumentNotNull(inputStream, "inputStream");
Assert.ArgumentNotNull(options, "options");
Assert.ArgumentNotNull(outputFormat, "outputFormat");
return(CropImageStream(inputStream, options, outputFormat));
}
/// <summary>
/// Crops the specified original image. Determines image format and calls appropriate methods for jpeg and gif image formats.
/// </summary>
/// <param name="originalImage">The original image.</param>
/// <param name="options">The options.</param>
/// <param name="outputFormat">The output format.</param>
/// <returns>Cropped bitmap</returns>
public Bitmap Crop(Bitmap originalImage, CustomTransformationOptions options, ImageFormat outputFormat)
{
if (outputFormat == ImageFormat.Gif)
{
return(this.CropGif(originalImage, options));
}
return(this.CropAny(originalImage, options));
}
/// <summary>
/// Gets the rectangle.
/// </summary>
/// <param name="image">The image.</param>
/// <param name="options">The options.</param>
/// <returns></returns>
private Rectangle GetRectangle(Image image, CustomTransformationOptions options)
{
if (options.CropRegion == null && options.CropRegion.Length != 4)
{
return(new Rectangle(0, 0, image.Width, image.Height));
}
var _x1 = 0;
var _y1 = 0;
var _x2 = 0;
var _y2 = 0;
var _x1Convert = int.TryParse(options.CropRegion[0], out _x1) ? _x1 : 0;
var _y1Convert = int.TryParse(options.CropRegion[1], out _y1) ? _y1 : 0;
var _x2Convert = int.TryParse(options.CropRegion[2], out _x2) ? _x2 : 0;
var _y2Convert = int.TryParse(options.CropRegion[3], out _y2) ? _y2 : 0;
if (_x2 > image.Width)
{
_x2 = image.Width;
}
if (_y2 > image.Height)
{
_y2 = image.Height;
}
if (_x1 > image.Width)
{
_x1 = 0;
}
if (_y1 > image.Height)
{
_y1 = 0;
}
if (_x1 < 0)
{
_x1 = 0;
}
if (_y1 < 0)
{
_y1 = 0;
}
var newWidth = _x2 - _x1;
var newHeight = _y2 - _y1;
return(new Rectangle(_x1, _y1, newWidth, newHeight));
}
/// <summary>
/// Crops the GIF.
/// </summary>
/// <param name="image">The image.</param>
/// <param name="options">The options.</param>
/// <returns>Cropped bitmap for GIF image</returns>
private Bitmap CropGif(Bitmap image, CustomTransformationOptions options)
{
int _x1 = 0;
int _y1 = 0;
int _x2 = 0;
int _y2 = 0;
string[] region = options.CropRegion;
if (region.Length >= 4)
{
_x1 = int.TryParse(region[0], out _x1) ? _x1 : 0;
_y1 = int.TryParse(region[1], out _y1) ? _y1 : 0;
_x2 = int.TryParse(region[2], out _x2) ? _x2 : 0;
_y2 = int.TryParse(region[3], out _y2) ? _y2 : 0;
if (_x2 > image.Width)
{
_x2 = image.Width;
}
if (_y2 > image.Height)
{
_y2 = image.Height;
}
if (_x1 < 0)
{
_x1 = 0;
}
if (_y1 < 0)
{
_y1 = 0;
}
}
int newWidth = _x2 - _x1;
int newHeight = _y2 - _y1;
Size size = new Size(newWidth, newHeight);
int colorIndex = this.GetColorIndex(options.BackgroundColor, image);
if (colorIndex < 0)
{
colorIndex = this.ReplaceLeastUsedColor(image, options.BackgroundColor);
}
Bitmap frame = this.CreateGifFrame(size, (byte)colorIndex, image);
return(this.OverlayGif(image, frame, options.CropRegion));
}
/// <summary>
/// Crops image if it's format is not GIF.
/// </summary>
/// <param name="image">The image.</param>
/// <param name="options">The options.</param>
/// <returns>Cropped bitmap.</returns>
private Bitmap CropAny(Image image, CustomTransformationOptions options)
{
try
{
//cropping
var bmpImage = new Bitmap(image);
var rectangle = GetRectangle(image, options);
var newImage = bmpImage.Clone(rectangle, bmpImage.PixelFormat);
return(newImage);
}
catch (Exception ex)
{
Log.Error(ex.Message, this);
return(new Bitmap(image));
}
}
/// <summary>
/// Gets the crop options.
/// </summary>
/// <param name="options">The options.</param>
/// <returns></returns>
protected virtual CustomTransformationOptions GetCropOptions(CustomTransformationOptions options)
{
return(new CustomTransformationOptions
{
AllowStretch = options.AllowStretch,
BackgroundColor = options.BackgroundColor,
IgnoreAspectRatio = options.IgnoreAspectRatio,
MaxSize = options.MaxSize,
Scale = options.Scale,
Size = options.Size,
PreserveResolution = options.PreserveResolution,
CompositingMode = options.CompositingMode,
InterpolationMode = options.InterpolationMode,
PixelOffsetMode = options.PixelOffsetMode,
CropRegion = options.CropRegion
});
}
/// <summary>
/// Gets the image options.
///
/// </summary>
///
/// <returns>
/// The transformation options.
///
/// </returns>
public new CustomTransformationOptions GetTransformationOptions()
{
var options = new CustomTransformationOptions()
{
AllowStretch = this.AllowStretch,
BackgroundColor = this.BackgroundColor,
IgnoreAspectRatio = this.IgnoreAspectRatio,
MaxSize = new Size(this.MaxWidth, this.MaxHeight),
Scale = this.Scale,
Size = new Size(this.Width, this.Height)
};
if (!string.IsNullOrEmpty(this.CropRegion))
{
options.CropRegion = this.CropRegion.Split(',');
}
return(options);
}
private Stream CropLegacy(Stream inputStream, CustomTransformationOptions options, ImageFormat outputFormat)
{
throw new NotImplementedException();
}
