Add ktx

ktx/tools/imageio/png.imageio/pngoutput.cc

@@ -0,0 +1,51 @@
+// -*- tab-width: 4; -*-
+// vi: set sw=2 ts=4 expandtab:
+
+// Copyright 2022 The Khronos Group Inc.
+// SPDX-License-Identifier: Apache-2.0
+
+/**
+ * @internal
+ * @~English
+ * @file
+ *
+ * @brief ImageOutput to  PNG format files.
+ *
+ * @author Mark Callow
+ */
+
+#include "imageio.h"
+
+#include <iterator>
+#include <sstream>
+#include <stdexcept>
+
+#include "lodepng.h"
+#include <KHR/khr_df.h>
+#include "dfd.h"
+
+class pngOutput final : public ImageOutput {
+  public:
+    pngOutput() : ImageOutput("png") {}
+    virtual ~pngOutput() { close(); }
+    virtual void close() override { }
+    virtual void open(const std::string& name, const ImageSpec& newspec,
+                      OpenMode mode) override;
+
+  protected:
+};
+
+ImageOutput*
+pngOutputCreate()
+{
+    return new pngOutput;
+}
+
+const char* pngOutputExtensions[] = { "png", nullptr };
+
+void
+pngOutput::open(const std::string& /*name*/, const ImageSpec& /*newspec*/,
+                OpenMode /*mode*/)
+{
+
+}