libcamera: buffer: Rename buffer.h to framebuffer.h

libcamera names header files based on the classes they define. The
buffer.h file is an exception. Rename it to framebuffer.h.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/internal/framebuffer.h

@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2020, Google Inc.
+ *
+ * framebuffer.h - Internal frame buffer handling
+ */
+#ifndef __LIBCAMERA_INTERNAL_FRAMEBUFFER_H__
+#define __LIBCAMERA_INTERNAL_FRAMEBUFFER_H__
+
+#include <sys/mman.h>
+#include <vector>
+
+#include <libcamera/base/class.h>
+#include <libcamera/base/span.h>
+
+#include <libcamera/framebuffer.h>
+
+namespace libcamera {
+
+class MappedBuffer
+{
+public:
+	using Plane = Span<uint8_t>;
+
+	~MappedBuffer();
+
+	MappedBuffer(MappedBuffer &&other);
+	MappedBuffer &operator=(MappedBuffer &&other);
+
+	bool isValid() const { return error_ == 0; }
+	int error() const { return error_; }
+	const std::vector<Plane> &maps() const { return maps_; }
+
+protected:
+	MappedBuffer();
+
+	int error_;
+	std::vector<Plane> maps_;
+
+private:
+	LIBCAMERA_DISABLE_COPY(MappedBuffer)
+};
+
+class MappedFrameBuffer : public MappedBuffer
+{
+public:
+	MappedFrameBuffer(const FrameBuffer *buffer, int flags);
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_INTERNAL_FRAMEBUFFER_H__ */