internal static bool TryGetCompressImageType(string extension, out CompressImageType compressImageType)
{
compressImageType = CompressImageType.Invalid;
if (string.IsNullOrWhiteSpace(extension))
{
return(false);
}
extension = extension.ToLowerInvariant();
if (extension == ".jpg" || extension == ".jpeg")
{
compressImageType = CompressImageType.Jpeg;
return(true);
}
if (extension == ".png")
{
compressImageType = CompressImageType.Png;
return(true);
}
if (extension == ".gif")
{
compressImageType = CompressImageType.Gif;
return(true);
}
return(false);
}
internal static bool TryGetCompressImageType(string extension, out CompressImageType compressImageType)
{
foreach (CompressImageType type in Enum.GetValues(typeof(CompressImageType)))
{
if (!string.Equals(type.AsString(EnumFormat.Description), extension, StringComparison.OrdinalIgnoreCase))
{
continue;
}
compressImageType = type;
return(true);
}
compressImageType = CompressImageType.Invalid;
return(false);
}
/// <summary>
/// Min 0 - max 99
/// </summary>
/// <param name="compressImageType"></param>
/// <returns></returns>
internal static CompressAlgorithm GetCompressAlgorithm(CompressImageType compressImageType)
{
var compressAlgorithm = CompressAlgorithm.Jpeg;
if (compressImageType == CompressImageType.Jpeg)
{
compressAlgorithm = CompressAlgorithm.Jpeg;
}
else if (compressImageType == CompressImageType.Png)
{
compressAlgorithm = CompressAlgorithm.Png;
}
else if (compressImageType == CompressImageType.Gif)
{
compressAlgorithm = CompressAlgorithm.Gif;
}
return(compressAlgorithm);
}
internal static bool TryGetCompressImageType(MemoryStream imageStream, out CompressImageType compressImageType)
{
bool isValid = false;
compressImageType = CompressImageType.Invalid;
try
{
// Raster Image
using (Image image = Image.FromStream(imageStream))
{
isValid = true;
if (ImageFormat.Jpeg.Equals(image.RawFormat))
{
compressImageType = CompressImageType.Jpeg;
}
else if (ImageFormat.Png.Equals(image.RawFormat))
{
compressImageType = CompressImageType.Png;
}
else if (ImageFormat.Gif.Equals(image.RawFormat))
{
compressImageType = CompressImageType.Gif;
}
else
{
isValid = false;
compressImageType = CompressImageType.Invalid;
}
}
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
return(isValid);
}
/// <summary>
/// Min 0 - max 99
/// </summary>
/// <param name="qualityPercent"> </param>
/// <param name="compressImageType"></param>
/// <returns></returns>
internal static int GetQualityPercent(int qualityPercent, CompressImageType compressImageType)
{
qualityPercent = qualityPercent < 0 ? 0 : (qualityPercent > 99 ? 99 : qualityPercent);
if (qualityPercent <= 0)
{
switch (compressImageType)
{
case CompressImageType.Png:
qualityPercent = CompressConstants.DefaultPngQualityPercent;
break;
case CompressImageType.Jpeg:
qualityPercent = CompressConstants.DefaultJpegQualityPercent;
break;
case CompressImageType.Gif:
qualityPercent = CompressConstants.DefaultGifQualityPercent;
break;
}
}
return(qualityPercent);
}
