src: Import MappedBuffer class from libcamera

This libcamera internal class, needs to be imported from
libcamera code base, in order to have standalone ipu3-ipa
build. Other libcamera components required by ipu3-ipa, will
be linked through libcamera_platform.so in subsequent commit.

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/include/libcamera-helpers/mapped_buffer.h b/include/libcamera-helpers/mapped_buffer.h
new file mode 100644
index 0000000..b34a70c
--- /dev/null
+++ b/include/libcamera-helpers/mapped_buffer.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2020, Google Inc.
+ *
+ * buffer.h - Internal buffer handling
+ */
+#ifndef __LIBCAMERA_MAPPED_BUFFER_H__
+#define __LIBCAMERA_MAPPED_BUFFER_H__
+
+#include <sys/mman.h>
+#include <vector>
+
+#include <libcamera/base/class.h>
+#include <libcamera/base/span.h>
+
+#include <libcamera/buffer.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_MAPPED_BUFFER_H__ */
+