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#ifndef __NR_FILTER_UNITS_H__
#define __NR_FILTER_UNITS_H__

 * Utilities for handling coordinate system transformations in filters
 * Author:
 *   Niko Kiirala <niko@kiirala.com>
 * Copyright (C) 2007 Niko Kiirala
 * Released under GNU GPL, read the file 'COPYING' for more information

#include "sp-filter-units.h"
#include "libnr/nr-matrix.h"
#include "libnr/nr-rect.h"
#include "libnr/nr-rect-l.h"
#include <2geom/matrix.h>
#include <2geom/rect.h>

namespace Inkscape {
namespace Filters {

class FilterUnits {
    FilterUnits(SPFilterUnits const filterUnits, SPFilterUnits const primitiveUnits);

     * Sets the current transformation matrix, i.e. transformation matrix
     * from object's user coordinates to screen coordinates
    void set_ctm(Geom::Matrix const &ctm);

     * Sets the resolution, the filter should be rendered with.
    void set_resolution(double const x_res, double const y_res);

     * Sets the item bounding box in user coordinates
    void set_item_bbox(Geom::OptRect const &bbox);

     * Sets the filter effects area in user coordinates
    void set_filter_area(Geom::OptRect const &area);

     * Sets, if x and y axis in pixblock coordinates should be paraller
     * to x and y of user coordinates.
    void set_paraller(bool const paraller);

     * Sets, if filter resolution is automatic.
     * NOTE: even if resolution is automatic, it must be set with
     * set_resolution. This only tells, if the set value is automatic.
    void set_automatic_resolution(bool const automatic);

     * Gets the user coordinates to pixblock coordinates transformation matrix.
    Geom::Matrix get_matrix_user2pb() const;

     * Gets the filterUnits to pixblock coordinates transformation matrix.
    Geom::Matrix get_matrix_filterunits2pb() const;

     * Gets the primitiveUnits to pixblock coordinates transformation matrix.
    Geom::Matrix get_matrix_primitiveunits2pb() const;

     * Gets the display coordinates to pixblock coordinates transformation
     * matrix.
    Geom::Matrix get_matrix_display2pb() const;

     * Gets the pixblock coordinates to display coordinates transformation
     * matrix
    Geom::Matrix get_matrix_pb2display() const;

     * Gets the user coordinates to filterUnits transformation matrix.
    Geom::Matrix get_matrix_user2filterunits() const;

     * Gets the user coordinates to primitiveUnits transformation matrix.
    Geom::Matrix get_matrix_user2primitiveunits() const;

     * Returns the filter area in pixblock coordinates.
     * NOTE: use only in filters, that define TRAIT_PARALLER in
     * get_input_traits. The filter effects area may not be representable
     * by simple rectangle otherwise. */
    NR::IRect get_pixblock_filterarea_paraller() const;

    FilterUnits& operator=(FilterUnits const &other);

    Geom::Matrix get_matrix_units2pb(SPFilterUnits units) const;
    Geom::Matrix get_matrix_user2units(SPFilterUnits units) const;

    SPFilterUnits filterUnits, primitiveUnits;
    double resolution_x, resolution_y;
    bool paraller_axis;
    bool automatic_resolution;
    Geom::Matrix ctm;
    Geom::OptRect item_bbox;
    Geom::OptRect filter_area;


} /* namespace Filters */
} /* namespace Inkscape */

#endif /* __NR_FILTER_UNITS_H__ */
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