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diff --git a/pugl/detail/implementation.h b/pugl/detail/implementation.h
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+/*
+  Copyright 2012-2019 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/**
+   @file implementation.h Shared declarations for implementation.
+*/
+
+#ifndef PUGL_DETAIL_IMPLEMENTATION_H
+#define PUGL_DETAIL_IMPLEMENTATION_H
+
+#include "pugl/detail/types.h"
+#include "pugl/pugl.h"
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Allocate and initialise internals (implemented once per platform) */
+PuglInternals* puglInitInternals(void);
+
+/** Return the Unicode code point for `buf` or the replacement character. */
+uint32_t puglDecodeUTF8(const uint8_t* buf);
+
+/** Dispatch `event` to `view`, optimising configure/expose if possible. */
+void puglDispatchEvent(PuglView* view, const PuglEvent* event);
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif // PUGL_DETAIL_IMPLEMENTATION_H