private void GetWebpInfo(IntPtr ptrRawWebP, int webpDataSize, out int width, out int height, out bool has_alpha, out bool has_animation, out string format)
{
VP8StatusCode result;
WebPBitstreamFeatures features = new WebPBitstreamFeatures();
result = WebPWrapper.WebPGetFeatures(ptrRawWebP, webpDataSize, ref features);
if (result == 0)
{
width = features.Width;
height = features.Height;
has_alpha = (features.Has_alpha == 1);
has_animation = (features.Has_animation == 1);
switch (features.Format)
{
case 1:
format = "lossy";
break;
case 2:
format = "lossless";
break;
default:
format = "undefined";
break;
}
}
else
{
throw new Exception(result.ToString());
}
}
public static VP8StatusCode WebPGetFeatures(IntPtr rawWebP, int data_size, ref WebPBitstreamFeatures features)
{
switch (IntPtr.Size)
{
case 4:
return(WebPGetFeaturesInternal_x86(rawWebP, (UIntPtr)data_size, ref features, WEBP_DECODER_ABI_VERSION));
case 8:
return(WebPGetFeaturesInternal_x64(rawWebP, (UIntPtr)data_size, ref features, WEBP_DECODER_ABI_VERSION));
default:
throw new InvalidOperationException("Invalid platform. Can not find proper function");
}
}
private static extern VP8StatusCode WebPGetFeaturesInternal_x64([InAttribute()] IntPtr rawWebP, UIntPtr data_size, ref WebPBitstreamFeatures features, int WEBP_DECODER_ABI_VERSION);
