Pinta.Core.Document.GetFlattenedImage C# (CSharp) Method

        public ImageSurface GetFlattenedImage()
        {
            // Create a new image surface
            var surf = new Cairo.ImageSurface (Cairo.Format.Argb32, ImageSize.Width, ImageSize.Height);

            // Blend each visible layer onto our surface
            foreach (var layer in GetLayersToPaint (include_tool_layer: false)) {
                using (var g = new Context (surf))
                    layer.Draw (g);
            }

            surf.MarkDirty ();
            return surf;
        }

        // For now, we only export in uncompressed ARGB32 format. If someone requests this functionality,
        // we can always add more through an export dialog.
        public void Export(Document document, string fileName)
        {
            ImageSurface surf = document.GetFlattenedImage (); // Assumes the surface is in ARGB32 format
            BinaryWriter writer = new BinaryWriter (new FileStream (fileName, FileMode.Create, FileAccess.Write));

            try {
                TgaHeader header = new TgaHeader();

                header.idLength = (byte) (ImageIdField.Length + 1);
                header.cmapType = 0;
                header.imageType = 2; // uncompressed RGB
                header.cmapIndex = 0;
                header.cmapLength = 0;
                header.cmapEntrySize = 0;
                header.xOrigin = 0;
                header.yOrigin = 0;
                header.imageWidth = (ushort) surf.Width;
                header.imageHeight = (ushort) surf.Height;
                header.pixelDepth = 32;
                header.imageDesc = 8; // 32-bit, lower-left origin, which is weird but hey...
                header.WriteTo (writer);

                writer.Write(ImageIdField);

                byte[] data = surf.Data;

                // It just so happens that the Cairo ARGB32 internal representation matches
                // the TGA format, except vertically-flipped. In little-endian, of course.
                for (int y = surf.Height - 1; y >= 0; y--)
                    writer.Write (data, surf.Stride * y, surf.Stride);
            } finally {
                (surf as IDisposable).Dispose ();
                writer.Close ();
            }
        }