#include "display/nr-filter-primitive.h"

#include "display/nr-filter-slot.h"

#include "display/nr-filter-types.h"

#include "svg/svg-length.h"

#include "inkscape.h"

#include "desktop.h"

#include "document.h"

#include "sp-root.h"

#include "style.h"

namespace Inkscape {

namespace Filters {

using Geom::X;

using Geom::Y;

FilterPrimitive::FilterPrimitive()

{

_input = NR_FILTER_SLOT_NOT_SET;

_output = NR_FILTER_SLOT_NOT_SET;

// Primitive subregion, should default to the union of all subregions of referenced nodes

// (i.e. other filter primitives except feTile). If no referenced nodes, defaults to filter

// region expressed in percent. At the moment, we do not check referenced nodes.

// We must keep track if a value is set or not, if not set then the region defaults to 0%, 0%,

// 100%, 100% ("x", "y", "width", "height") of the -> filter <- region. If set, then

// percentages are in terms of bounding box or viewbox, depending on value of "primitiveUnits".

// NB: SVGLength.set takes prescaled percent values: 1 means 100%

_subregion_x.unset(SVGLength::PERCENT, 0, 0);

_subregion_y.unset(SVGLength::PERCENT, 0, 0);

_subregion_width.unset(SVGLength::PERCENT, 1, 0);

_subregion_height.unset(SVGLength::PERCENT, 1, 0);

_style = NULL;

}

FilterPrimitive::~FilterPrimitive()

{

if(_style)

sp_style_unref(_style);

}

void FilterPrimitive::render_cairo(FilterSlot &slot)

{

// passthrough

cairo_surface_t *in = slot.getcairo(_input);

slot.set(_output, in);

}

void FilterPrimitive::area_enlarge(Geom::IntRect &/*area*/, Geom::Affine const &/*m*/)

{

// This doesn't need to do anything by default

}

void FilterPrimitive::set_input(int slot) {

set_input(0, slot);

}

void FilterPrimitive::set_input(int input, int slot) {

if (input == 0) _input = slot;

}

void FilterPrimitive::set_output(int slot) {

if (slot >= 0) _output = slot;

}

void FilterPrimitive::set_x(SVGLength const &length)

{

_subregion_x = length;

}

void FilterPrimitive::set_y(SVGLength const &length)

{

_subregion_y = length;

}

void FilterPrimitive::set_width(SVGLength const &length)

{

_subregion_width = length;

}

void FilterPrimitive::set_height(SVGLength const &length)

{

_subregion_height = length;

}

void FilterPrimitive::set_subregion(SVGLength const &x, SVGLength const &y,

SVGLength const &width, SVGLength const &height) {

_subregion_x = x;

_subregion_y = y;

_subregion_width = width;

_subregion_height = height;

}

Geom::Rect FilterPrimitive::filter_primitive_area(FilterUnits const &units)

{

Geom::OptRect const bb_opt = units.get_item_bbox();

Geom::OptRect const fa_opt = units.get_filter_area();

Geom::Rect bb;

Geom::Rect fa;

if (!bb_opt || !fa_opt) {

return Geom::Rect (Geom::Point(0.,0.), Geom::Point(0.,0.));

} else {

bb = *bb_opt;

fa = *fa_opt;

}

// x, y, width, and height are independently defined (i.e. one can be defined, by default, to

// the filter area (via default value ) while another is defined relative to the bounding

// box). It is better to keep track of them separately and then compose the Rect at the end.

double x = 0;

double y = 0;

double width = 0;

double height = 0;

// If subregion not set, by special case use filter region.

if( !_subregion_x._set ) x = fa.min()[X];

if( !_subregion_y._set ) y = fa.min()[Y];

if( !_subregion_width._set ) width = fa.width();

if( !_subregion_height._set ) height = fa.height();

if( units.get_primitive_units() == SP_FILTER_UNITS_OBJECTBOUNDINGBOX ) {

// Update computed values for ex, em, %.

// For %, assumes primitive unit is objectBoundingBox.

// TODO: fetch somehow the object ex and em lengths; 12, 6 are just dummy values.

double len_x = bb.width();

double len_y = bb.height();

_subregion_x.update(12, 6, len_x);

_subregion_y.update(12, 6, len_y);

_subregion_width.update(12, 6, len_x);

_subregion_height.update(12, 6, len_y);

// Values are in terms of fraction of bounding box.

if( _subregion_x._set && (_subregion_x.unit != SVGLength::PERCENT) ) x = bb.min()[X] + bb.width() * _subregion_x.value;

if( _subregion_y._set && (_subregion_y.unit != SVGLength::PERCENT) ) y = bb.min()[Y] + bb.height() * _subregion_y.value;

if( _subregion_width._set && (_subregion_width.unit != SVGLength::PERCENT) ) width = bb.width() * _subregion_width.value;

if( _subregion_height._set && (_subregion_height.unit != SVGLength::PERCENT) ) height = bb.height() * _subregion_height.value;

// Values are in terms of percent

if( _subregion_x._set && (_subregion_x.unit == SVGLength::PERCENT) ) x = bb.min()[X] + _subregion_x.computed;

if( _subregion_y._set && (_subregion_y.unit == SVGLength::PERCENT) ) y = bb.min()[Y] + _subregion_y.computed;

if( _subregion_width._set && (_subregion_width.unit == SVGLength::PERCENT) ) width = _subregion_width.computed;

if( _subregion_height._set && (_subregion_height.unit == SVGLength::PERCENT) ) height = _subregion_height.computed;

} else {

// Values are in terms of user space coordinates or percent of viewport (already calculated in sp-filter-primitive.cpp).

if( _subregion_x._set ) x = _subregion_x.computed;

if( _subregion_y._set ) y = _subregion_y.computed;

if( _subregion_width._set ) width = _subregion_width.computed;

if( _subregion_height._set ) height = _subregion_height.computed;

}

return Geom::Rect (Geom::Point(x,y), Geom::Point(x + width, y + height));

}

void FilterPrimitive::setStyle(SPStyle *style)

{

if( style != _style ) {

if (style) sp_style_ref(style);

if (_style) sp_style_unref(_style);

_style = style;

}

}

} /* namespace Filters */

} /* namespace Inkscape */