Hjg.Pngcs.PngWriter.WriteFirstChunks C# (CSharp) Method

        private void WriteFirstChunks()
        {
            int nw = 0;
            CurrentChunkGroup = ChunksList.CHUNK_GROUP_1_AFTERIDHR;
            nw = chunksList.writeChunks(outputStream, CurrentChunkGroup);
            CurrentChunkGroup = ChunksList.CHUNK_GROUP_2_PLTE;
            nw = chunksList.writeChunks(outputStream, CurrentChunkGroup);
            if (nw > 0 && ImgInfo.Greyscale)
                throw new PngjOutputException("cannot write palette for this format");
            if (nw == 0 && ImgInfo.Indexed)
                throw new PngjOutputException("missing palette");
            CurrentChunkGroup = ChunksList.CHUNK_GROUP_3_AFTERPLTE;
            nw = chunksList.writeChunks(outputStream, CurrentChunkGroup);
            CurrentChunkGroup = ChunksList.CHUNK_GROUP_4_IDAT;
        }