private bool DoCompress(Stream stream, bool lossless)
{
ImageOptimizerHelper.CheckStream(stream);
bool isCompressed = false;
var startPosition = stream.Position;
using (var images = new MagickImageCollection(stream, new MagickReadSettings()
{
Format = MagickFormat.Ico
}))
{
foreach (var image in images)
{
if (image.Width > 255)
{
image.Format = MagickFormat.Png;
var pngHelper = new PngHelper(this);
var memoryStream = pngHelper.FindBestStreamQuality(image, out var bestQuality);
image.Format = MagickFormat.Ico;
if (memoryStream != null)
{
memoryStream.Dispose();
image.Quality = bestQuality;
}
}
else
{
if (CanUseColormap(image, lossless))
{
image.ClassType = ClassType.Pseudo;
}
}
}
using (var output = new MemoryStream())
{
images.Write(output);
if (output.Length < (stream.Length - startPosition))
{
isCompressed = true;
stream.Position = startPosition;
output.Position = 0;
StreamHelper.Copy(output, stream);
stream.SetLength(startPosition + output.Length);
}
stream.Position = startPosition;
}
}
return(isCompressed);
}
private bool DoCompress(FileInfo file, bool lossless)
{
bool isCompressed = false;
var settings = new MagickReadSettings()
{
Format = MagickFormat.Ico
};
using (var images = new MagickImageCollection(file, settings))
{
foreach (var image in images)
{
if (image.Width > 255)
{
image.Format = MagickFormat.Png;
var pngHelper = new PngHelper(this);
var memoryStream = pngHelper.FindBestStreamQuality(image, out var bestQuality);
image.Format = MagickFormat.Ico;
if (memoryStream != null)
{
memoryStream.Dispose();
image.Quality = bestQuality;
}
}
else
{
if (CanUseColormap(image, lossless))
{
image.ClassType = ClassType.Pseudo;
}
}
}
using (var tempFile = new TemporaryFile())
{
images.Write(tempFile);
if (tempFile.Length < file.Length)
{
isCompressed = true;
tempFile.CopyTo(file);
file.Refresh();
}
}
}
return(isCompressed);
}
private bool DoCompress(Stream stream, bool lossless)
{
ImageOptimizerHelper.CheckStream(stream);
var isCompressed = false;
var startPosition = stream.Position;
using (var image = new MagickImage(stream))
{
StartCompression(image, lossless);
MemoryStream bestStream = null;
try
{
var pngHelper = new PngHelper(this);
bestStream = pngHelper.FindBestStreamQuality(image, out _);
if (bestStream != null && bestStream.Length < (stream.Length - startPosition))
{
isCompressed = true;
stream.Position = startPosition;
bestStream.Position = 0;
bestStream.CopyTo(stream);
stream.SetLength(startPosition + bestStream.Length);
}
stream.Position = startPosition;
}
finally
{
if (bestStream != null)
{
bestStream.Dispose();
}
}
}
return(isCompressed);
}