/// <summary>
/// Compresses input image to the jpeg format with specified quality.
/// </summary>
/// <param name="srcBuf">
/// Image buffer containing RGB, grayscale, or CMYK pixels to be compressed.
/// This buffer is not modified.
/// </param>
/// <param name="destBuf">
/// A <see cref="byte"/> array containing the compressed image.
/// </param>
/// <param name="stride">
/// Bytes per line in the source image.
/// Normally, this should be <c>width * BytesPerPixel</c> if the image is unpadded,
/// or <c>TJPAD(width * BytesPerPixel</c> if each line of the image
/// is padded to the nearest 32-bit boundary, as is the case for Windows bitmaps.
/// You can also be clever and use this parameter to skip lines, etc.
/// Setting this parameter to 0 is the equivalent of setting it to
/// <c>width * BytesPerPixel</c>.
/// </param>
/// <param name="width">Width (in pixels) of the source image.</param>
/// <param name="height">Height (in pixels) of the source image.</param>
/// <param name="pixelFormat">Pixel format of the source image (see <see cref="PixelFormat"/> "Pixel formats").</param>
/// <param name="subSamp">
/// The level of chrominance subsampling to be used when
/// generating the JPEG image (see <see cref="TJSubsamplingOption"/> "Chrominance subsampling options".)
/// </param>
/// <param name="quality">The image quality of the generated JPEG image (1 = worst, 100 = best).</param>
/// <param name="flags">The bitwise OR of one or more of the <see cref="TJFlags"/> "flags".</param>
/// <returns>
/// A <see cref="Span{T}"/> which is a slice of <paramref name="destBuf"/> which holds the compressed image.
/// </returns>
/// <exception cref="TJException">
/// Throws if compress function failed.
/// </exception>
/// <exception cref="ObjectDisposedException">Object is disposed and can not be used anymore.</exception>
/// <exception cref="NotSupportedException">
/// Some parameters' values are incompatible:
/// <list type="bullet">
/// <item><description>Subsampling not equals to <see cref="TJSubsamplingOption.Gray"/> and pixel format <see cref="TJPixelFormat.Gray"/></description></item>
/// </list>
/// </exception>
public static unsafe Span <byte> Compress(this TJCompressor @this, ReadOnlySpan <byte> srcBuf, Span <byte> destBuf, int stride, int width, int height, PixelFormat pixelFormat, TJSubsamplingOption subSamp, int quality, TJFlags flags)
{
_ = @this ?? throw new ArgumentNullException(nameof(@this));
var tjPixelFormat = TJGdiPlusUtils.ConvertPixelFormat(pixelFormat);
return(@this.Compress(srcBuf, destBuf, stride, width, height, tjPixelFormat, subSamp, quality, flags));
}
/// <summary>
/// Compresses input image to the jpeg format with specified quality.
/// </summary>
/// <param name="srcPtr">
/// Pointer to an image buffer containing RGB, grayscale, or CMYK pixels to be compressed.
/// This buffer is not modified.
/// </param>
/// <param name="stride">
/// Bytes per line in the source image.
/// Normally, this should be <c>width * BytesPerPixel</c> if the image is unpadded,
/// or <c>TJPAD(width * BytesPerPixel</c> if each line of the image
/// is padded to the nearest 32-bit boundary, as is the case for Windows bitmaps.
/// You can also be clever and use this parameter to skip lines, etc.
/// Setting this parameter to 0 is the equivalent of setting it to
/// <c>width * BytesPerPixel</c>.
/// </param>
/// <param name="width">Width (in pixels) of the source image.</param>
/// <param name="height">Height (in pixels) of the source image.</param>
/// <param name="pixelFormat">Pixel format of the source image (see <see cref="PixelFormat"/> "Pixel formats").</param>
/// <param name="subSamp">
/// The level of chrominance subsampling to be used when
/// generating the JPEG image (see <see cref="TJSubsamplingOption"/> "Chrominance subsampling options".)
/// </param>
/// <param name="quality">The image quality of the generated JPEG image (1 = worst, 100 = best).</param>
/// <param name="flags">The bitwise OR of one or more of the <see cref="TJFlags"/> "flags".</param>
/// <returns>
/// A <see cref="byte"/> array containing the compressed image.
/// </returns>
/// <exception cref="TJException"> Throws if compress function failed. </exception>
/// <exception cref="ObjectDisposedException">Object is disposed and can not be used anymore.</exception>
/// <exception cref="NotSupportedException">
/// Some parameters' values are incompatible:
/// <list type="bullet">
/// <item><description>Subsampling not equals to <see cref="TJSubsamplingOption.Gray"/> and pixel format <see cref="TJPixelFormat.Gray"/></description></item>
/// </list>
/// </exception>
public static byte[] Compress(this TJCompressor @this, IntPtr srcPtr, int stride, int width, int height, PixelFormat pixelFormat,
TJSubsamplingOption subSamp, int quality, TJFlags flags)
{
_ = @this ?? throw new ArgumentNullException(nameof(@this));
var tjPixelFormat = TJGdiPlusUtils.ConvertPixelFormat(pixelFormat);
return(@this.Compress(srcPtr, stride, width, height, tjPixelFormat, subSamp, quality, flags));
}
public static byte[] Compress(this TJCompressor @this, SKBitmap srcImage, TJSubsamplingOption subSamp, int quality, TJFlags flags)
{
_ = @this ?? throw new ArgumentNullException(nameof(@this));
_ = srcImage ?? throw new ArgumentNullException(nameof(srcImage));
var tjPixelFormat = TJSkiaUtils.ConvertPixelFormat(srcImage.ColorType);
var width = srcImage.Width;
var height = srcImage.Height;
var srcPtr = srcImage.GetPixels();
var stride = srcImage.RowBytes;
return(@this.Compress(srcPtr, stride, width, height, tjPixelFormat, subSamp, quality, flags));
}
public static byte[] Recompress(
ReadOnlySpan <byte> jpegBytes,
int quality = 70,
TJSubsamplingOption subsampling = TJSubsamplingOption.Chrominance420,
TJFlags flags = TJFlags.None)
{
var pixelFormat = TJPixelFormat.BGRA;
using var decr = new TJDecompressor();
var raw = decr.Decompress(jpegBytes, pixelFormat, flags, out var width, out var height, out var stride);
decr.Dispose();
using var compr = new TJCompressor();
var compressed = compr.Compress(raw, stride, width, height, pixelFormat, subsampling, quality, flags);
return(compressed);
}
/// <summary>
/// Compresses input image to the jpeg format with specified quality.
/// </summary>
/// <param name="srcImage"> Source image to be converted. </param>
/// <param name="subSamp">
/// The level of chrominance subsampling to be used when
/// generating the JPEG image (see <see cref="TJSubsamplingOption"/> "Chrominance subsampling options".)
/// </param>
/// <param name="quality">The image quality of the generated JPEG image (1 = worst, 100 = best).</param>
/// <param name="flags">The bitwise OR of one or more of the <see cref="TJFlags"/> "flags".</param>
/// <returns>
/// A <see cref="byte"/> array containing the compressed image.
/// </returns>
/// <remarks>Only <see cref="PixelFormat.Format24bppRgb"/>, <see cref="PixelFormat.Format32bppArgb"/>, <see cref="PixelFormat.Format8bppIndexed"/> pixel formats are supported.</remarks>
/// <exception cref="TJException"> Throws if compress function failed. </exception>
/// <exception cref="ObjectDisposedException">Object is disposed and can not be used anymore.</exception>
/// <exception cref="NotSupportedException">
/// Some parameters' values are incompatible:
/// <list type="bullet">
/// <item><description>Subsampling not equals to <see cref="TJSubsamplingOption.Gray"/> and pixel format <see cref="TJPixelFormat.Gray"/></description></item>
/// </list>
/// </exception>
public static byte[] Compress(this TJCompressor @this, Bitmap srcImage, TJSubsamplingOption subSamp, int quality, TJFlags flags)
{
_ = @this ?? throw new ArgumentNullException(nameof(@this));
var pixelFormat = srcImage.PixelFormat;
var width = srcImage.Width;
var height = srcImage.Height;
var srcData = srcImage.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadOnly, pixelFormat);
var stride = srcData.Stride;
var srcPtr = srcData.Scan0;
try
{
return(@this.Compress(srcPtr, stride, width, height, pixelFormat, subSamp, quality, flags));
}
finally
{
srcImage.UnlockBits(srcData);
}
}
/// <summary>
/// Compresses input image to the jpeg format with specified quality.
/// </summary>
/// <param name="srcBuf">
/// Image buffer containing RGB, grayscale, or CMYK pixels to be compressed.
/// This buffer is not modified.
/// </param>
/// <param name="destBuf">
/// A <see cref="byte"/> array containing the compressed image.
/// </param>
/// <param name="stride">
/// Bytes per line in the source image.
/// Normally, this should be <c>width * BytesPerPixel</c> if the image is unpadded,
/// or <c>TJPAD(width * BytesPerPixel</c> if each line of the image
/// is padded to the nearest 32-bit boundary, as is the case for Windows bitmaps.
/// You can also be clever and use this parameter to skip lines, etc.
/// Setting this parameter to 0 is the equivalent of setting it to
/// <c>width * BytesPerPixel</c>.
/// </param>
/// <param name="width">Width (in pixels) of the source image.</param>
/// <param name="height">Height (in pixels) of the source image.</param>
/// <param name="pixelFormat">Pixel format of the source image (see <see cref="PixelFormat"/> "Pixel formats").</param>
/// <param name="subSamp">
/// The level of chrominance subsampling to be used when
/// generating the JPEG image (see <see cref="TJSubsamplingOption"/> "Chrominance subsampling options".)
/// </param>
/// <param name="quality">The image quality of the generated JPEG image (1 = worst, 100 = best).</param>
/// <param name="flags">The bitwise OR of one or more of the <see cref="TJFlags"/> "flags".</param>
/// <returns>
/// The size of the JPEG image (in bytes).
/// </returns>
/// <exception cref="TJException">
/// Throws if compress function failed.
/// </exception>
/// <exception cref="ObjectDisposedException">Object is disposed and can not be used anymore.</exception>
/// <exception cref="NotSupportedException">
/// Some parameters' values are incompatible:
/// <list type="bullet">
/// <item><description>Subsampling not equals to <see cref="TJSubsamplingOption.Gray"/> and pixel format <see cref="TJPixelFormat.Gray"/></description></item>
/// </list>
/// </exception>
public static unsafe int Compress(this TJCompressor @this, byte[] srcBuf, byte[] destBuf, int stride, int width, int height, PixelFormat pixelFormat, TJSubsamplingOption subSamp, int quality, TJFlags flags)
{
_ = @this ?? throw new ArgumentNullException(nameof(@this));
return(@this.Compress(srcBuf.AsSpan(), destBuf.AsSpan(), stride, width, height, pixelFormat, subSamp, quality, flags).Length);
}
