--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/render_png_struct.h	Mon Jun 09 03:15:34 2008 +0300
@@ -0,0 +1,26 @@
+#ifndef RENDER_PNG_INTERNAL_H
+#define RENDER_PNG_INTERNAL_H
+
+#include <png.h>
+
+#include "render.h"
+#include "render_png.h"
+
+struct render_png {
+    // do I need to free it?
+    int owned_by_me;
+
+    // libpng handles
+    png_structp png_ptr;
+    png_infop info_ptr;
+
+    // some info that we need to keep from the struct render
+    render_ctx_write_cb io_write_fn;
+    render_ctx_flush_cb io_flush_fn;
+    void *cb_arg;
+};
+
+int render_png_init (struct render_png *ctx, struct render *render);
+int render_png_deinit (struct render_png *ctx);
+
+#endif /* RENDER_PNG_INTERNAL_H */