/// <summary>
/// Creates a deep copy of an image allowing you to set the pixel format.
/// Disposing of the original is the responsibility of the user.
/// <remarks>
/// Unlike the native <see cref="Image.Clone"/> method this also copies animation frames.
/// </remarks>
/// </summary>
/// <param name="source">The source image to copy.</param>
/// <param name="animationProcessMode">The process mode for frames in animated images.</param>
/// <param name="format">The <see cref="PixelFormat"/> to set the copied image to.</param>
/// <param name="preserveExifData">Whether to preserve exif metadata. Defaults to false.</param>
/// <returns>
/// The <see cref="Image"/>.
/// </returns>
public static Image Copy(this Image source, AnimationProcessMode animationProcessMode, PixelFormat format = PixelFormat.Format32bppPArgb, bool preserveExifData = false)
{
if (source.RawFormat.Equals(ImageFormat.Gif))
{
// Read from the correct first frame when performing additional processing
source.SelectActiveFrame(FrameDimension.Time, 0);
GifDecoder decoder = new GifDecoder(source, animationProcessMode);
GifEncoder encoder = new GifEncoder(null, null, decoder.LoopCount);
// Have to use Octree here, there's no way to inject it.
OctreeQuantizer quantizer = new OctreeQuantizer();
for (int i = 0; i < decoder.FrameCount; i++)
{
GifFrame frame = decoder.GetFrame(source, i);
frame.Image = quantizer.Quantize(((Bitmap)frame.Image).Clone(new Rectangle(0, 0, frame.Image.Width, frame.Image.Height), format));
((Bitmap)frame.Image).SetResolution(source.HorizontalResolution, source.VerticalResolution);
encoder.AddFrame(frame);
}
return encoder.Save();
}
// Create a new image and copy it's pixels.
Bitmap copy = new Bitmap(source.Width, source.Height, format);
copy.SetResolution(source.HorizontalResolution, source.VerticalResolution);
using (Graphics graphics = Graphics.FromImage(copy))
{
graphics.DrawImageUnscaled(source, 0, 0);
}
if (preserveExifData)
{
foreach (PropertyItem item in source.PropertyItems)
{
copy.SetPropertyItem(item);
}
}
return copy;
}
/// <summary>
/// Processes the image.
/// </summary>
/// <param name="processor">
/// The processor.
/// </param>
/// <param name="factory">
/// The factory.
/// </param>
private static void ApplyProcessor(Func<ImageFactory, Image> processor, ImageFactory factory)
{
ImageInfo imageInfo = factory.Image.GetImageInfo(factory.ImageFormat);
if (imageInfo.IsAnimated)
{
OctreeQuantizer quantizer = new OctreeQuantizer(255, 8);
// We don't dispose of the memory stream as that is disposed when a new image is created and doing so
// beforehand will cause an exception.
MemoryStream stream = new MemoryStream();
using (GifEncoder encoder = new GifEncoder(stream, null, null, imageInfo.LoopCount))
{
foreach (GifFrame frame in imageInfo.GifFrames)
{
factory.Update(frame.Image);
frame.Image = quantizer.Quantize(processor.Invoke(factory));
encoder.AddFrame(frame);
}
}
stream.Position = 0;
factory.Update(Image.FromStream(stream));
}
else
{
factory.Update(processor.Invoke(factory));
}
// Set the property item information from any Exif metadata.
// We do this here so that they can be changed between processor methods.
if (factory.PreserveExifData)
{
foreach (KeyValuePair<int, PropertyItem> propertItem in factory.ExifPropertyItems)
{
try
{
factory.Image.SetPropertyItem(propertItem.Value);
}
// ReSharper disable once EmptyGeneralCatchClause
catch
{
// Do nothing. The image format does not handle EXIF data.
// TODO: empty catch is fierce code smell.
}
}
}
}
/// <summary>
/// Uses the <see cref="T:ImageProcessor.Imaging.OctreeQuantizer"/>
/// to fix the color palette of gif images.
/// </summary>
private void FixGifs()
{
// Fix the colour palette of gif images.
// TODO: Why does the palette not get fixed when resized to the same dimensions.
if (object.Equals(this.ImageFormat, ImageFormat.Gif))
{
OctreeQuantizer quantizer = new OctreeQuantizer(255, 8);
this.Image = quantizer.Quantize(this.Image);
}
}
/// <summary>
/// Applies the given processor the current image.
/// </summary>
/// <param name="processor">
/// The processor delegate.
/// </param>
private void ApplyProcessor(Func<ImageFactory, Image> processor)
{
ImageInfo imageInfo = this.Image.GetImageInfo(this.ImageFormat);
if (imageInfo.IsAnimated)
{
OctreeQuantizer quantizer = new OctreeQuantizer(255, 8);
// We don't dispose of the memory stream as that is disposed when a new image is created and doing so
// beforehand will cause an exception.
MemoryStream stream = new MemoryStream();
using (GifEncoder encoder = new GifEncoder(stream, null, null, imageInfo.LoopCount))
{
foreach (GifFrame frame in imageInfo.GifFrames)
{
this.Image = frame.Image;
frame.Image = quantizer.Quantize(processor.Invoke(this));
encoder.AddFrame(frame);
}
}
stream.Position = 0;
this.Image = Image.FromStream(stream);
}
else
{
this.Image = processor.Invoke(this);
}
}
