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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
commit | cca66b9ec4e494c1d919bff0f71a820d8afab1fa (patch) | |
tree | 146f39ded1c938019e1ed42d30923c2ac9e86789 /src/display/nr-filter.cpp | |
parent | Initial commit. (diff) | |
download | inkscape-upstream.tar.xz inkscape-upstream.zip |
Adding upstream version 1.2.2.upstream/1.2.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/display/nr-filter.cpp | 499 |
1 files changed, 499 insertions, 0 deletions
diff --git a/src/display/nr-filter.cpp b/src/display/nr-filter.cpp new file mode 100644 index 0000000..eec7c1a --- /dev/null +++ b/src/display/nr-filter.cpp @@ -0,0 +1,499 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * SVG filters rendering + * + * Author: + * Niko Kiirala <niko@kiirala.com> + * + * Copyright (C) 2006-2008 Niko Kiirala + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include <glib.h> +#include <cmath> +#include <cstring> +#include <string> +#include <cairo.h> + +#include "display/nr-filter.h" +#include "display/nr-filter-primitive.h" +#include "display/nr-filter-slot.h" +#include "display/nr-filter-types.h" +#include "display/nr-filter-units.h" + +#include "display/nr-filter-blend.h" +#include "display/nr-filter-composite.h" +#include "display/nr-filter-convolve-matrix.h" +#include "display/nr-filter-colormatrix.h" +#include "display/nr-filter-component-transfer.h" +#include "display/nr-filter-diffuselighting.h" +#include "display/nr-filter-displacement-map.h" +#include "display/nr-filter-image.h" +#include "display/nr-filter-flood.h" +#include "display/nr-filter-gaussian.h" +#include "display/nr-filter-merge.h" +#include "display/nr-filter-morphology.h" +#include "display/nr-filter-offset.h" +#include "display/nr-filter-specularlighting.h" +#include "display/nr-filter-tile.h" +#include "display/nr-filter-turbulence.h" + +#include "display/cairo-utils.h" +#include "display/drawing.h" +#include "display/drawing-item.h" +#include "display/drawing-context.h" +#include "display/drawing-surface.h" +#include <2geom/affine.h> +#include <2geom/rect.h> +#include "svg/svg-length.h" +//#include "sp-filter-units.h" +#include "preferences.h" + +namespace Inkscape { +namespace Filters { + +using Geom::X; +using Geom::Y; + +Filter::Filter() +{ + _common_init(); +} + +Filter::Filter(int n) +{ + if (n > 0) _primitive.reserve(n); + _common_init(); +} + +void Filter::_common_init() { + _slot_count = 1; + // Having "not set" here as value means the output of last filter + // primitive will be used as output of this filter + _output_slot = NR_FILTER_SLOT_NOT_SET; + + // These are the default values for filter region, + // as specified in SVG standard + // NB: SVGLength.set takes prescaled percent values: -.10 means -10% + _region_x.set(SVGLength::PERCENT, -.10, 0); + _region_y.set(SVGLength::PERCENT, -.10, 0); + _region_width.set(SVGLength::PERCENT, 1.20, 0); + _region_height.set(SVGLength::PERCENT, 1.20, 0); + + // Filter resolution, negative value here stands for "automatic" + _x_pixels = -1.0; + _y_pixels = -1.0; + + _filter_units = SP_FILTER_UNITS_OBJECTBOUNDINGBOX; + _primitive_units = SP_FILTER_UNITS_USERSPACEONUSE; +} + +Filter::~Filter() +{ + clear_primitives(); +} + + +int Filter::render(Inkscape::DrawingItem const *item, DrawingContext &graphic, DrawingContext *bgdc) +{ + // std::cout << "Filter::render() for: " << const_cast<Inkscape::DrawingItem *>(item)->name() << std::endl; + // std::cout << " graphic drawing_scale: " << graphic.surface()->device_scale() << std::endl; + + if (_primitive.empty()) { + // when no primitives are defined, clear source graphic + graphic.setSource(0,0,0,0); + graphic.setOperator(CAIRO_OPERATOR_SOURCE); + graphic.paint(); + graphic.setOperator(CAIRO_OPERATOR_OVER); + return 1; + } + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + item->drawing().setFilterQuality(prefs->getInt("/options/filterquality/value", 0)); + item->drawing().setBlurQuality(prefs->getInt("/options/blurquality/value", 0)); + FilterQuality const filterquality = (FilterQuality)item->drawing().filterQuality(); + int const blurquality = item->drawing().blurQuality(); + + Geom::Affine trans = item->ctm(); + + Geom::OptRect filter_area = filter_effect_area(item->itemBounds()); + if (!filter_area) return 1; + + FilterUnits units(_filter_units, _primitive_units); + units.set_ctm(trans); + units.set_item_bbox(item->itemBounds()); + units.set_filter_area(*filter_area); + + std::pair<double,double> resolution + = _filter_resolution(*filter_area, trans, filterquality); + if (!(resolution.first > 0 && resolution.second > 0)) { + // zero resolution - clear source graphic and return + graphic.setSource(0,0,0,0); + graphic.setOperator(CAIRO_OPERATOR_SOURCE); + graphic.paint(); + graphic.setOperator(CAIRO_OPERATOR_OVER); + return 1; + } + + units.set_resolution(resolution.first, resolution.second); + if (_x_pixels > 0) { + units.set_automatic_resolution(false); + } + else { + units.set_automatic_resolution(true); + } + + units.set_paraller(false); + Geom::Affine pbtrans = units.get_matrix_display2pb(); + for (auto & i : _primitive) { + if (!i->can_handle_affine(pbtrans)) { + units.set_paraller(true); + break; + } + } + + FilterSlot slot(const_cast<Inkscape::DrawingItem*>(item), bgdc, graphic, units); + slot.set_quality(filterquality); + slot.set_blurquality(blurquality); + slot.set_device_scale(graphic.surface()->device_scale()); + + for (auto & i : _primitive) { + i->render_cairo(slot); + } + + Geom::Point origin = graphic.targetLogicalBounds().min(); + cairo_surface_t *result = slot.get_result(_output_slot); + + // Assume for the moment that we paint the filter in sRGB + set_cairo_surface_ci( result, SP_CSS_COLOR_INTERPOLATION_SRGB ); + + graphic.setSource(result, origin[Geom::X], origin[Geom::Y]); + graphic.setOperator(CAIRO_OPERATOR_SOURCE); + graphic.paint(); + graphic.setOperator(CAIRO_OPERATOR_OVER); + cairo_surface_destroy(result); + + return 0; +} + +void Filter::set_filter_units(SPFilterUnits unit) { + _filter_units = unit; +} + +void Filter::set_primitive_units(SPFilterUnits unit) { + _primitive_units = unit; +} + +void Filter::area_enlarge(Geom::IntRect &bbox, Inkscape::DrawingItem const *item) const { + for (auto i : _primitive) { + if (i) i->area_enlarge(bbox, item->ctm()); + } + +/* + TODO: something. See images at the bottom of filters.svg with medium-low + filtering quality. + + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + FilterQuality const filterquality = (FilterQuality)prefs->getInt("/options/filterquality/value"); + + if (_x_pixels <= 0 && (filterquality == FILTER_QUALITY_BEST || + filterquality == FILTER_QUALITY_BETTER)) { + return; + } + + Geom::Rect item_bbox; + Geom::OptRect maybe_bbox = item->itemBounds(); + if (maybe_bbox.empty()) { + // Code below needs a bounding box + return; + } + item_bbox = *maybe_bbox; + + std::pair<double,double> res_low + = _filter_resolution(item_bbox, item->ctm(), filterquality); + //std::pair<double,double> res_full + // = _filter_resolution(item_bbox, item->ctm(), FILTER_QUALITY_BEST); + double pixels_per_block = fmax(item_bbox.width() / res_low.first, + item_bbox.height() / res_low.second); + bbox.x0 -= (int)pixels_per_block; + bbox.x1 += (int)pixels_per_block; + bbox.y0 -= (int)pixels_per_block; + bbox.y1 += (int)pixels_per_block; +*/ +} + +Geom::OptRect Filter::filter_effect_area(Geom::OptRect const &bbox) +{ + Geom::Point minp, maxp; + + if (_filter_units == SP_FILTER_UNITS_OBJECTBOUNDINGBOX) { + + double len_x = bbox ? bbox->width() : 0; + double len_y = bbox ? bbox->height() : 0; + /* TODO: fetch somehow the object ex and em lengths */ + + // Update for em, ex, and % values + _region_x.update(12, 6, len_x); + _region_y.update(12, 6, len_y); + _region_width.update(12, 6, len_x); + _region_height.update(12, 6, len_y); + + if (!bbox) return Geom::OptRect(); + + if (_region_x.unit == SVGLength::PERCENT) { + minp[X] = bbox->left() + _region_x.computed; + } else { + minp[X] = bbox->left() + _region_x.computed * len_x; + } + if (_region_width.unit == SVGLength::PERCENT) { + maxp[X] = minp[X] + _region_width.computed; + } else { + maxp[X] = minp[X] + _region_width.computed * len_x; + } + + if (_region_y.unit == SVGLength::PERCENT) { + minp[Y] = bbox->top() + _region_y.computed; + } else { + minp[Y] = bbox->top() + _region_y.computed * len_y; + } + if (_region_height.unit == SVGLength::PERCENT) { + maxp[Y] = minp[Y] + _region_height.computed; + } else { + maxp[Y] = minp[Y] + _region_height.computed * len_y; + } + } else if (_filter_units == SP_FILTER_UNITS_USERSPACEONUSE) { + // Region already set in sp-filter.cpp + minp[X] = _region_x.computed; + maxp[X] = minp[X] + _region_width.computed; + minp[Y] = _region_y.computed; + maxp[Y] = minp[Y] + _region_height.computed; + } else { + g_warning("Error in Inkscape::Filters::Filter::filter_effect_area: unrecognized value of _filter_units"); + } + + Geom::OptRect area(minp, maxp); + // std::cout << "Filter::filter_effect_area: area: " << *area << std::endl; + return area; +} + +double Filter::complexity(Geom::Affine const &ctm) +{ + double factor = 1.0; + for (auto & i : _primitive) { + if (i) { + double f = i->complexity(ctm); + factor += (f - 1.0); + } + } + return factor; +} + +bool Filter::uses_background() +{ + for (auto & i : _primitive) { + if (i && i->uses_background()) { + return true; + } + } + return false; +} + +/* Constructor table holds pointers to static methods returning filter + * primitives. This table is indexed with FilterPrimitiveType, so that + * for example method in _constructor[NR_FILTER_GAUSSIANBLUR] + * returns a filter object of type Inkscape::Filters::FilterGaussian. + */ +typedef FilterPrimitive*(*FilterConstructor)(); +static FilterConstructor _constructor[NR_FILTER_ENDPRIMITIVETYPE]; + +void Filter::_create_constructor_table() +{ + // Constructor table won't change in run-time, so no need to recreate + static bool created = false; + if(created) return; + +/* Some filter classes are not implemented yet. + Some of them still have only boilerplate code.*/ + _constructor[NR_FILTER_BLEND] = &FilterBlend::create; + _constructor[NR_FILTER_COLORMATRIX] = &FilterColorMatrix::create; + _constructor[NR_FILTER_COMPONENTTRANSFER] = &FilterComponentTransfer::create; + _constructor[NR_FILTER_COMPOSITE] = &FilterComposite::create; + _constructor[NR_FILTER_CONVOLVEMATRIX] = &FilterConvolveMatrix::create; + _constructor[NR_FILTER_DIFFUSELIGHTING] = &FilterDiffuseLighting::create; + _constructor[NR_FILTER_DISPLACEMENTMAP] = &FilterDisplacementMap::create; + _constructor[NR_FILTER_FLOOD] = &FilterFlood::create; + _constructor[NR_FILTER_GAUSSIANBLUR] = &FilterGaussian::create; + _constructor[NR_FILTER_IMAGE] = &FilterImage::create; + _constructor[NR_FILTER_MERGE] = &FilterMerge::create; + _constructor[NR_FILTER_MORPHOLOGY] = &FilterMorphology::create; + _constructor[NR_FILTER_OFFSET] = &FilterOffset::create; + _constructor[NR_FILTER_SPECULARLIGHTING] = &FilterSpecularLighting::create; + _constructor[NR_FILTER_TILE] = &FilterTile::create; + _constructor[NR_FILTER_TURBULENCE] = &FilterTurbulence::create; + created = true; +} + +int Filter::add_primitive(FilterPrimitiveType type) +{ + _create_constructor_table(); + + // Check that we can create a new filter of specified type + if (type < 0 || type >= NR_FILTER_ENDPRIMITIVETYPE) + return -1; + if (!_constructor[type]) return -1; + FilterPrimitive *created = _constructor[type](); + + int handle = _primitive.size(); + _primitive.push_back(created); + return handle; +} + +int Filter::replace_primitive(int target, FilterPrimitiveType type) +{ + _create_constructor_table(); + + // Check that target is valid primitive inside this filter + if (target < 0) return -1; + if (static_cast<unsigned>(target) >= _primitive.size()) return -1; + + // Check that we can create a new filter of specified type + if (type < 0 || type >= NR_FILTER_ENDPRIMITIVETYPE) + return -1; + if (!_constructor[type]) return -1; + FilterPrimitive *created = _constructor[type](); + + delete _primitive[target]; + _primitive[target] = created; + return target; +} + +FilterPrimitive *Filter::get_primitive(int handle) { + if (handle < 0 || handle >= static_cast<int>(_primitive.size())) return nullptr; + return _primitive[handle]; +} + +void Filter::clear_primitives() +{ + for (auto & i : _primitive) { + delete i; + } + _primitive.clear(); +} + +void Filter::set_x(SVGLength const &length) +{ + if (length._set) + _region_x = length; +} +void Filter::set_y(SVGLength const &length) +{ + if (length._set) + _region_y = length; +} +void Filter::set_width(SVGLength const &length) +{ + if (length._set) + _region_width = length; +} +void Filter::set_height(SVGLength const &length) +{ + if (length._set) + _region_height = length; +} + +void Filter::set_resolution(double const pixels) { + if (pixels > 0) { + _x_pixels = pixels; + _y_pixels = pixels; + } +} + +void Filter::set_resolution(double const x_pixels, double const y_pixels) { + if (x_pixels >= 0 && y_pixels >= 0) { + _x_pixels = x_pixels; + _y_pixels = y_pixels; + } +} + +void Filter::reset_resolution() { + _x_pixels = -1; + _y_pixels = -1; +} + +int Filter::_resolution_limit(FilterQuality const quality) const { + int limit = -1; + switch (quality) { + case FILTER_QUALITY_WORST: + limit = 32; + break; + case FILTER_QUALITY_WORSE: + limit = 64; + break; + case FILTER_QUALITY_NORMAL: + limit = 256; + break; + case FILTER_QUALITY_BETTER: + case FILTER_QUALITY_BEST: + default: + break; + } + return limit; +} + +std::pair<double,double> Filter::_filter_resolution( + Geom::Rect const &area, Geom::Affine const &trans, + FilterQuality const filterquality) const +{ + std::pair<double,double> resolution; + if (_x_pixels > 0) { + double y_len; + if (_y_pixels > 0) { + y_len = _y_pixels; + } else { + y_len = (_x_pixels * (area.max()[Y] - area.min()[Y])) + / (area.max()[X] - area.min()[X]); + } + resolution.first = _x_pixels; + resolution.second = y_len; + } else { + Geom::Point origo = area.min(); + origo *= trans; + Geom::Point max_i(area.max()[X], area.min()[Y]); + max_i *= trans; + Geom::Point max_j(area.min()[X], area.max()[Y]); + max_j *= trans; + double i_len = sqrt((origo[X] - max_i[X]) * (origo[X] - max_i[X]) + + (origo[Y] - max_i[Y]) * (origo[Y] - max_i[Y])); + double j_len = sqrt((origo[X] - max_j[X]) * (origo[X] - max_j[X]) + + (origo[Y] - max_j[Y]) * (origo[Y] - max_j[Y])); + int limit = _resolution_limit(filterquality); + if (limit > 0 && (i_len > limit || j_len > limit)) { + double aspect_ratio = i_len / j_len; + if (i_len > j_len) { + i_len = limit; + j_len = i_len / aspect_ratio; + } + else { + j_len = limit; + i_len = j_len * aspect_ratio; + } + } + resolution.first = i_len; + resolution.second = j_len; + } + return resolution; +} + +} /* namespace Filters */ +} /* namespace Inkscape */ + +/* + Local Variables: + mode:c++ + c-file-style:"stroustrup" + c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +)) + indent-tabs-mode:nil + fill-column:99 + End: +*/ +// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 : |