public IntPtr MarshalManagedToNative(object ManagedObj)
{
if (ManagedObj == null)
{
return(IntPtr.Zero);
}
WebPNative.MetadataParams metadata = (WebPNative.MetadataParams)ManagedObj;
IntPtr nativeStructure = Marshal.AllocHGlobal(NativeMetadataParamsSize);
unsafe
{
NativeMetadataParams *nativeMetadata = (NativeMetadataParams *)nativeStructure;
if (metadata.iccProfile != null && metadata.iccProfile.Length > 0)
{
nativeMetadata->iccProfile = Marshal.AllocHGlobal(metadata.iccProfile.Length);
Marshal.Copy(metadata.iccProfile, 0, nativeMetadata->iccProfile, metadata.iccProfile.Length);
nativeMetadata->iccProfileSize = new UIntPtr((uint)metadata.iccProfile.Length);
}
else
{
nativeMetadata->iccProfile = IntPtr.Zero;
nativeMetadata->iccProfileSize = UIntPtr.Zero;
}
if (metadata.exif != null && metadata.exif.Length > 0)
{
nativeMetadata->exif = Marshal.AllocHGlobal(metadata.exif.Length);
Marshal.Copy(metadata.exif, 0, nativeMetadata->exif, metadata.exif.Length);
nativeMetadata->exifSize = new UIntPtr((uint)metadata.exif.Length);
}
else
{
nativeMetadata->exif = IntPtr.Zero;
nativeMetadata->exifSize = UIntPtr.Zero;
}
if (metadata.xmp != null && metadata.xmp.Length > 0)
{
nativeMetadata->xmp = Marshal.AllocHGlobal(metadata.xmp.Length);
Marshal.Copy(metadata.xmp, 0, nativeMetadata->xmp, metadata.xmp.Length);
nativeMetadata->xmpSize = new UIntPtr((uint)metadata.xmp.Length);
}
else
{
nativeMetadata->xmp = IntPtr.Zero;
nativeMetadata->xmpSize = UIntPtr.Zero;
}
}
return(nativeStructure);
}
/// <summary>
/// The WebP save function.
/// </summary>
/// <param name="input">The input Document.</param>
/// <param name="output">The output Stream.</param>
/// <param name="quality">The WebP save quality.</param>
/// <param name="preset">The WebP encoding preset.</param>
/// <param name="keepMetadata"><c>true</c> if metadata should be preserved; otherwise <c>false</c>.</param>
/// <param name="scratchSurface">The scratch surface.</param>
/// <param name="progressCallback">The progress callback.</param>
/// <exception cref="FormatException">The image exceeds 16383 pixels in width and/or height.</exception>
/// <exception cref="OutOfMemoryException">Insufficient memory to save the image.</exception>
/// <exception cref="WebPException">The encoder returned a non-memory related error.</exception>
internal static void Save(
Document input,
Stream output,
int quality,
WebPPreset preset,
bool keepMetadata,
Surface scratchSurface,
ProgressEventHandler progressCallback)
{
if (input.Width > WebPNative.WebPMaxDimension || input.Height > WebPNative.WebPMaxDimension)
{
throw new FormatException(Resources.InvalidImageDimensions);
}
WebPNative.EncodeParams encParams = new WebPNative.EncodeParams
{
quality = quality,
preset = preset
};
using (RenderArgs ra = new RenderArgs(scratchSurface))
{
input.Render(ra, true);
}
WebPNative.MetadataParams metadata = null;
if (keepMetadata)
{
metadata = CreateWebPMetadata(input, scratchSurface);
}
WebPNative.WebPReportProgress encProgress = null;
if (progressCallback != null)
{
encProgress = delegate(int percent)
{
try
{
progressCallback(null, new ProgressEventArgs(percent, true));
return(true);
}
catch (OperationCanceledException)
{
return(false);
}
};
}
WebPNative.WebPSave(scratchSurface, output, encParams, metadata, encProgress);
}