pagemanager.hxx

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#pragma once

#include <basegfx/vector/b2isize.hxx>
#include <rendering/irendermodule.hxx>

#include "page.hxx"

namespace canvas
{
    // PageManager
    class PageManager
    {
    public:
        explicit PageManager(const std::shared_ptr<canvas::IRenderModule>& rRenderModule)
            : mpRenderModule(rRenderModule)
        {
        }

        // returns the maximum size of a hardware
        // accelerated page, e.g. OpenGL texture.
        ::basegfx::B2ISize getPageSize() const;

        const std::shared_ptr<canvas::IRenderModule>& getRenderModule() const { return mpRenderModule; }

        FragmentSharedPtr allocateSpace( const ::basegfx::B2ISize& rSize );
        void              free( const FragmentSharedPtr& pFragment );

        void              nakedFragment( const FragmentSharedPtr& pFragment );

        void              validatePages();

    private:
        // the pagemanager needs access to the rendermodule
        // since we query for system resources from it.
        std::shared_ptr<canvas::IRenderModule> mpRenderModule;

        // here we collect all fragments that will be created
        // since we need them for relocation purposes.
        typedef std::vector<FragmentSharedPtr> FragmentContainer_t;
        FragmentContainer_t maFragments;

        // this is the container holding all created pages,
        // behind the scenes these are real hardware surfaces.
        std::vector<PageSharedPtr> maPages;

        bool relocate( const FragmentSharedPtr& pFragment );
    };


    // PageManagerSharedPtr


    typedef std::shared_ptr< PageManager > PageManagerSharedPtr;
}

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