/// <summary>
/// Encodes the image to the specified stream from the <see cref="Image{TPixel}"/>.
/// </summary>
/// <typeparam name="TPixel">The pixel format.</typeparam>
/// <param name="image">The <see cref="ImageFrame{TPixel}"/> to encode from.</param>
/// <param name="stream">The <see cref="Stream"/> to encode the image data to.</param>
public void Encode <TPixel>(Image <TPixel> image, Stream stream)
where TPixel : struct, IPixel <TPixel>
{
Guard.NotNull(image, nameof(image));
Guard.NotNull(stream, nameof(stream));
this.width = image.Width;
this.height = image.Height;
ImageMetadata metadata = image.Metadata;
PngMetadata pngMetadata = metadata.GetPngMetadata();
PngEncoderOptionsHelpers.AdjustOptions <TPixel>(this.options, pngMetadata, out this.use16Bit, out this.bytesPerPixel);
IQuantizedFrame <TPixel> quantized = PngEncoderOptionsHelpers.CreateQuantizedFrame(this.options, image);
this.bitDepth = PngEncoderOptionsHelpers.CalculateBitDepth(this.options, image, quantized);
stream.Write(PngConstants.HeaderBytes, 0, PngConstants.HeaderBytes.Length);
this.WriteHeaderChunk(stream);
this.WritePaletteChunk(stream, quantized);
this.WriteTransparencyChunk(stream, pngMetadata);
this.WritePhysicalChunk(stream, metadata);
this.WriteGammaChunk(stream);
this.WriteExifChunk(stream, metadata);
this.WriteTextChunks(stream, pngMetadata);
this.WriteDataChunks(image.Frames.RootFrame, quantized, stream);
this.WriteEndChunk(stream);
stream.Flush();
quantized?.Dispose();
}
/// <summary>
/// Creates the quantized image and sets calculates and sets the bit depth.
/// </summary>
/// <typeparam name="TPixel">The type of the pixel.</typeparam>
/// <param name="image">The image to quantize.</param>
/// <param name="clonedImage">Cloned image with transparent pixels are changed to black.</param>
/// <returns>The quantized image.</returns>
private IndexedImageFrame <TPixel> CreateQuantizedImage <TPixel>(Image <TPixel> image, Image <TPixel> clonedImage)
where TPixel : unmanaged, IPixel <TPixel>
{
IndexedImageFrame <TPixel> quantized;
if (this.options.TransparentColorMode == PngTransparentColorMode.Clear)
{
quantized = PngEncoderOptionsHelpers.CreateQuantizedFrame(this.options, clonedImage);
this.bitDepth = PngEncoderOptionsHelpers.CalculateBitDepth(this.options, quantized);
}
else
{
quantized = PngEncoderOptionsHelpers.CreateQuantizedFrame(this.options, image);
this.bitDepth = PngEncoderOptionsHelpers.CalculateBitDepth(this.options, quantized);
}
return(quantized);
}
/// <summary>
/// Encodes the image to the specified stream from the <see cref="Image{TPixel}"/>.
/// </summary>
/// <typeparam name="TPixel">The pixel format.</typeparam>
/// <param name="image">The <see cref="ImageFrame{TPixel}"/> to encode from.</param>
/// <param name="stream">The <see cref="Stream"/> to encode the image data to.</param>
public void Encode <TPixel>(Image <TPixel> image, Stream stream)
where TPixel : unmanaged, IPixel <TPixel>
{
Guard.NotNull(image, nameof(image));
Guard.NotNull(stream, nameof(stream));
this.width = image.Width;
this.height = image.Height;
ImageMetadata metadata = image.Metadata;
PngMetadata pngMetadata = metadata.GetFormatMetadata(PngFormat.Instance);
PngEncoderOptionsHelpers.AdjustOptions <TPixel>(this.options, pngMetadata, out this.use16Bit, out this.bytesPerPixel);
Image <TPixel> clonedImage = null;
bool clearTransparency = this.options.TransparentColorMode == PngTransparentColorMode.Clear;
if (clearTransparency)
{
clonedImage = image.Clone();
ClearTransparentPixels(clonedImage);
}
IndexedImageFrame <TPixel> quantized = this.CreateQuantizedImage(image, clonedImage);
stream.Write(PngConstants.HeaderBytes);
this.WriteHeaderChunk(stream);
this.WriteGammaChunk(stream);
this.WritePaletteChunk(stream, quantized);
this.WriteTransparencyChunk(stream, pngMetadata);
this.WritePhysicalChunk(stream, metadata);
this.WriteExifChunk(stream, metadata);
this.WriteTextChunks(stream, pngMetadata);
this.WriteDataChunks(clearTransparency ? clonedImage : image, quantized, stream);
this.WriteEndChunk(stream);
stream.Flush();
quantized?.Dispose();
clonedImage?.Dispose();
}
