/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#pragma once

#include <vcl/bitmap.hxx>

namespace sd::slidesorter::view {

class FramePainter
{
public:
    explicit FramePainter (const Bitmap& rBitmap);
    ~FramePainter();

    /** Paint a border around the given box by using a set of bitmaps for
        the corners and sides.
    */
    void PaintFrame (OutputDevice&rDevice, const ::tools::Rectangle& rBox) const;

    /** Special functionality that takes the color from the center
        bitmap and replaces that color in all bitmaps by the given new
        color.  Alpha values are not modified.
        The center bitmap is erased.
    */
    void AdaptColor (const Color aNewColor);

private:
    /** Bitmap with offset that is used when the bitmap is painted.  The bitmap
    */
    class OffsetBitmap {
    public:
        Bitmap maBitmap;
        Point maOffset;

        /** Create one of the eight shadow bitmaps from one that combines
            them all.  This larger bitmap is expected to have dimension NxN
            with N=1+2*M.  Of this larger bitmap there are created four
            corner bitmaps of size 2*M x 2*M and four side bitmaps of sizes
            1xM (top and bottom) and Mx1 (left and right).  The corner
            bitmaps have each one quadrant of size MxM that is painted under
            the interior of the frame.
            @param rBitmap
                The larger bitmap of which the eight shadow bitmaps are cut
                out from.
            @param nHorizontalPosition
                Valid values are -1 (left), 0 (center), and +1 (right).
            @param nVerticalPosition
                Valid values are -1 (top), 0 (center), and +1 (bottom).
        */
        OffsetBitmap (
            const Bitmap& rBitmap,
            const sal_Int32 nHorizontalPosition,
            const sal_Int32 nVerticalPosition);

        /** Use the given device to paint the bitmap at the location that is
            the sum of the given anchor and the internal offset.
        */
        void PaintCorner (OutputDevice& rDevice, const Point& rAnchor) const;

        /** Use the given device to paint the bitmap stretched between the
            two given locations.  Offsets of the adjacent corner bitmaps and
            the offset of the side bitmap are used to determine the area
            that is to be filled with the side bitmap.
        */
        void PaintSide (
            OutputDevice& rDevice,
            const Point& rAnchor1,
            const Point& rAnchor2,
            const OffsetBitmap& rCornerBitmap1,
            const OffsetBitmap& rCornerBitmap2) const;

        /** Fill the given rectangle with the bitmap.
        */
        void PaintCenter (
            OutputDevice& rDevice,
            const ::tools::Rectangle& rBox) const;
    };
    OffsetBitmap maTopLeft;
    OffsetBitmap maTop;
    OffsetBitmap maTopRight;
    OffsetBitmap maLeft;
    OffsetBitmap maRight;
    OffsetBitmap maBottomLeft;
    OffsetBitmap maBottom;
    OffsetBitmap maBottomRight;
    OffsetBitmap maCenter;
    bool mbIsValid;
};

} // end of namespace sd::slidesorter::view

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