private IOptimizerResult ProcessStream(byte[] imageBytes)
{
if (imageBytes == null)
{
return(new PngOptimizerResult
{
SizeBefore = 0,
SizeAfter = 0,
Success = true
});
}
IntPtr pngOptimizer = GetOrLoadPngOptimizer();
byte[] resultBytes = new byte[imageBytes.Length + 400000];
int resultSize;
IntPtr addressOfOptimize = NativeMethods.GetProcAddress(pngOptimizer, "PO_OptimizeFileMem");
if (addressOfOptimize == IntPtr.Zero)
{
throw new Exception("Can't find optimize funtion in PngOptimizerDll.dll!");
}
OptimizeBytes optimizeMethod = (OptimizeBytes)Marshal.GetDelegateForFunctionPointer(addressOfOptimize, typeof(OptimizeBytes));
bool success = optimizeMethod(imageBytes, imageBytes.Length, resultBytes, resultBytes.Length, out resultSize);
var result = new PngOptimizerResult
{
Success = success,
SizeBefore = imageBytes.Length,
SizeAfter = resultSize,
};
if (result.SizeBefore > result.SizeAfter)
{
result.OptimizedBytes = resultBytes.Take(resultSize).ToArray();
}
if (result.Success)
{
return(result);
}
IntPtr addressOfGetError = NativeMethods.GetProcAddress(pngOptimizer, "PO_GetLastErrorString");
if (addressOfGetError == IntPtr.Zero)
{
throw new Exception("Can't find get last error funtion in PngOptimizerDll.dll!");
}
GetLastErrorString errorMethod = (GetLastErrorString)Marshal.GetDelegateForFunctionPointer(addressOfGetError, typeof(GetLastErrorString));
result.ErrorMessage = errorMethod();
return(result);
}
public override IOptimizerResult Optimize(MediaStream stream)
{
IntPtr pngOptimizer = GetOrLoadPngOptimizer();
using (var memoryStream = new MemoryStream())
{
stream.Stream.CopyTo(memoryStream);
byte[] imageBytes = memoryStream.ToArray();
byte[] resultBytes = new byte[imageBytes.Length + 400000];
int resultSize;
IntPtr addressOfOptimize = NativeMethods.GetProcAddress(pngOptimizer, "PO_OptimizeFileMem");
if (addressOfOptimize == IntPtr.Zero)
{
throw new Exception("Can't find optimize funtion in PngOptimizerDll.dll!");
}
OptimizeBytes optimizeMethod = (OptimizeBytes)Marshal.GetDelegateForFunctionPointer(addressOfOptimize, typeof(OptimizeBytes));
bool success = optimizeMethod(imageBytes, imageBytes.Length, resultBytes, resultBytes.Length, out resultSize);
var result = new PngOptimizerResult();
result.Success = success;
result.SizeBefore = imageBytes.Length;
result.SizeAfter = resultSize;
result.OptimizedBytes = resultBytes.Take(resultSize).ToArray();
if (!result.Success)
{
IntPtr addressOfGetError = NativeMethods.GetProcAddress(pngOptimizer, "PO_GetLastErrorString");
if (addressOfGetError == IntPtr.Zero)
{
throw new Exception("Can't find get last error funtion in PngOptimizerDll.dll!");
}
GetLastErrorString errorMethod = (GetLastErrorString)Marshal.GetDelegateForFunctionPointer(addressOfGetError, typeof(GetLastErrorString));
result.ErrorMessage = errorMethod();
}
return(OptimizationSuccessful(result));
}
}
