public T LoadBitmapFromStream <T>(Stream stream, CreateBitmapDelegate <T> create)
{
using (GdkPixBufBitmapSource source = LoadSourceFromStream(stream))
{
return(create(source));
}
}
private T LoadBitmapFromStream <T>(Stream stream, Guid pixelFormat, CreateBitmapDelegate <T> createImage)
{
byte[] streamContent;
using (var mem = new MemoryStream())
{
stream.CopyTo(mem);
streamContent = mem.ToArray();
}
GCHandle pinnedContent = GCHandle.Alloc(streamContent, GCHandleType.Pinned);
try
{
IntPtr pinnedContentPtr = pinnedContent.AddrOfPinnedObject();
return(LoadBitmapFromMemory(pinnedContentPtr, (uint)streamContent.Length, pixelFormat, createImage));
}
finally
{
pinnedContent.Free();
}
}
private T LoadBitmapFromMemory <T>(IntPtr sourceBuffer, uint sourceBufferSize, Guid pixelFormat, CreateBitmapDelegate <T> createBitmap)
{
IWICImagingFactory imagingFactory = null;
IWICStream wicStream = null;
IWICBitmapDecoder decoder = null;
IWICBitmapFrameDecode frame = null;
IWICFormatConverter formatConverter = null;
try
{
imagingFactory = new IWICImagingFactory();
wicStream = imagingFactory.CreateStream();
wicStream.InitializeFromMemory(sourceBuffer, sourceBufferSize);
decoder = imagingFactory.CreateDecoderFromStream(
wicStream,
Guid.Empty,
WICDecodeOptions.WICDecodeMetadataCacheOnLoad
);
frame = decoder.GetFrame(0);
IWICBitmapSource source;
if (frame.GetPixelFormat() == pixelFormat)
{
source = frame;
}
else
{
formatConverter = imagingFactory.CreateFormatConverter();
formatConverter.Initialize(
frame,
WICPixelFormat.GUID_WICPixelFormat32bppPBGRA,
WICBitmapDitherType.WICBitmapDitherTypeNone,
null,
0.0f,
WICBitmapPaletteType.WICBitmapPaletteTypeCustom
);
source = formatConverter;
}
source.GetSize(out uint width, out uint height);
if (width * 4UL > int.MaxValue || height * 4UL > int.MaxValue || 4UL * width * height > int.MaxValue)
{
throw new IOException($"Image is too large: {width}x{height}.");
}
WicBitmapSource bitmapSource = new WicBitmapSource(source, (int)width, (int)height);
return(createBitmap(bitmapSource));
}
finally
{
SafeRelease(formatConverter);
SafeRelease(frame);
SafeRelease(decoder);
SafeRelease(wicStream);
SafeRelease(imagingFactory);
}
}
public T LoadBitmapFromStream <T>(Stream stream, CreateBitmapDelegate <T> createBitmap)
{
return(LoadBitmapFromStream(stream, WICPixelFormat.GUID_WICPixelFormat32bppBGRA, createBitmap));
}
