image_source.h

/*
**  UICore
**  Copyright (c) 1997-2015 The UICore Team
**
**  This software is provided 'as-is', without any express or implied
**  warranty.  In no event will the authors be held liable for any damages
**  arising from the use of this software.
**
**  Permission is granted to anyone to use this software for any purpose,
**  including commercial applications, and to alter it and redistribute it
**  freely, subject to the following restrictions:
**
**  1. The origin of this software must not be misrepresented; you must not
**     claim that you wrote the original software. If you use this software
**     in a product, an acknowledgment in the product documentation would be
**     appreciated but is not required.
**  2. Altered source versions must be plainly marked as such, and must not be
**     misrepresented as being the original software.
**  3. This notice may not be removed or altered from any source distribution.
**
**  Note: Some of the libraries UICore may link to may have additional
**  requirements or restrictions.
**
**  File Author(s):
**
**    Magnus Norddahl
*/

#pragma once

#include <memory>
#include <functional>

namespace uicore
{
    class Canvas;
    typedef std::shared_ptr<Canvas> CanvasPtr;
    class Image;
    typedef std::shared_ptr<Image> ImagePtr;

    class ImageSource
    {
    public:
        virtual ImagePtr image(const CanvasPtr &canvas) = 0;
        static std::shared_ptr<ImageSource> from_resource(const std::string &resource_name);
        static std::shared_ptr<ImageSource> from_callback(const std::function<ImagePtr(const CanvasPtr &)> &get_image_callback);
        static std::shared_ptr<ImageSource> from_image(const ImagePtr &image);

    protected:
        virtual ~ImageSource() { }
    };
}