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Diffstat (limited to 'src/display/drawing.cpp')
| -rw-r--r-- | src/display/drawing.cpp | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/src/display/drawing.cpp b/src/display/drawing.cpp new file mode 100644 index 0000000..c306095 --- /dev/null +++ b/src/display/drawing.cpp @@ -0,0 +1,262 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** + * @file + * SVG drawing for display. + *//* + * Authors: + * Krzysztof Kosiński <tweenk.pl@gmail.com> + * Johan Engelen <j.b.c.engelen@alumnus.utwente.nl> + * + * Copyright (C) 2011-2012 Authors + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include "display/drawing.h" +#include "display/control/canvas-item-drawing.h" +#include "nr-filter-gaussian.h" +#include "nr-filter-types.h" + +//grayscale colormode: +#include "cairo-templates.h" +#include "drawing-context.h" + + +namespace Inkscape { + +// hardcoded grayscale color matrix values as default +static const gdouble grayscale_value_matrix[20] = { + 0.21, 0.72, 0.072, 0, 0, + 0.21, 0.72, 0.072, 0, 0, + 0.21, 0.72, 0.072, 0, 0, + 0 , 0 , 0 , 1, 0 +}; + +Drawing::Drawing(Inkscape::CanvasItemDrawing *canvas_item_drawing) + : _canvas_item_drawing(canvas_item_drawing) + , _grayscale_colormatrix(std::vector<gdouble>(grayscale_value_matrix, grayscale_value_matrix + 20)) +{ + // _canvas_item_drawing can be null. Used this way by Eraser tool. +} + +Drawing::~Drawing() +{ + delete _root; +} + +void +Drawing::setRoot(DrawingItem *item) +{ + delete _root; + _root = item; + if (item) { + assert(item->_child_type == DrawingItem::CHILD_ORPHAN); + item->_child_type = DrawingItem::CHILD_ROOT; + } +} + +RenderMode +Drawing::renderMode() const +{ + return _exact ? RenderMode::NORMAL : _rendermode; +} +ColorMode +Drawing::colorMode() const +{ + return (outline() || _exact) ? ColorMode::NORMAL : _colormode; +} +bool +Drawing::outline() const +{ + return renderMode() == RenderMode::OUTLINE; +} +bool +Drawing::visibleHairlines() const +{ + return renderMode() == RenderMode::VISIBLE_HAIRLINES; +} +bool +Drawing::outlineOverlay() const +{ + return renderMode() == RenderMode::OUTLINE_OVERLAY; +} +bool +Drawing::renderFilters() const +{ + return renderMode() == RenderMode::NORMAL || renderMode() == RenderMode::VISIBLE_HAIRLINES || renderMode() == RenderMode::OUTLINE_OVERLAY; +} +int +Drawing::blurQuality() const +{ + if (renderMode() == RenderMode::NORMAL) { + return _exact ? BLUR_QUALITY_BEST : _blur_quality; + } else { + return BLUR_QUALITY_WORST; + } +} +int +Drawing::filterQuality() const +{ + if (renderMode() == RenderMode::NORMAL) { + return _exact ? Filters::FILTER_QUALITY_BEST : _filter_quality; + } else { + return Filters::FILTER_QUALITY_WORST; + } +} + +void +Drawing::setRenderMode(RenderMode mode) +{ + _rendermode = mode; +} +void +Drawing::setColorMode(ColorMode mode) +{ + _colormode = mode; +} +void +Drawing::setBlurQuality(int q) +{ + _blur_quality = q; +} +void +Drawing::setFilterQuality(int q) +{ + _filter_quality = q; +} +void +Drawing::setExact(bool e) +{ + _exact = e; +} + +void Drawing::setOutlineSensitive(bool e) { _outline_sensitive = e; }; + +Geom::OptIntRect const & +Drawing::cacheLimit() const +{ + return _cache_limit; +} +void +Drawing::setCacheLimit(Geom::OptIntRect const &r) +{ + _cache_limit = r; + for (auto _cached_item : _cached_items) { + _cached_item->_markForUpdate(DrawingItem::STATE_CACHE, false); + } +} +void +Drawing::setCacheBudget(size_t bytes) +{ + _cache_budget = bytes; + _pickItemsForCaching(); +} + +void +Drawing::setGrayscaleMatrix(gdouble value_matrix[20]) { + _grayscale_colormatrix = Filters::FilterColorMatrix::ColorMatrixMatrix( + std::vector<gdouble> (value_matrix, value_matrix + 20) ); +} + +void +Drawing::update(Geom::IntRect const &area, unsigned flags, unsigned reset) +{ + if (_root) { + auto ctx = _canvas_item_drawing ? _canvas_item_drawing->get_context() : UpdateContext(); + _root->update(area, ctx, flags, reset); + } + if ((flags & DrawingItem::STATE_CACHE) || (flags & DrawingItem::STATE_ALL)) { + // process the updated cache scores + _pickItemsForCaching(); + } +} + +void +Drawing::render(DrawingContext &dc, Geom::IntRect const &area, unsigned flags, int antialiasing) +{ + if (_root) { + int prev_a = _root->_antialias; + if(antialiasing >= 0) + _root->setAntialiasing(antialiasing); + _root->render(dc, area, flags); + _root->setAntialiasing(prev_a); + } + + if (colorMode() == ColorMode::GRAYSCALE) { + // apply grayscale filter on top of everything + cairo_surface_t *input = dc.rawTarget(); + cairo_surface_t *out = ink_cairo_surface_create_identical(input); + ink_cairo_surface_filter(input, out, _grayscale_colormatrix); + Geom::Point origin = dc.targetLogicalBounds().min(); + dc.setSource(out, origin[Geom::X], origin[Geom::Y]); + dc.setOperator(CAIRO_OPERATOR_SOURCE); + dc.paint(); + dc.setOperator(CAIRO_OPERATOR_OVER); + + cairo_surface_destroy(out); + } +} + +DrawingItem * +Drawing::pick(Geom::Point const &p, double delta, unsigned flags) +{ + if (_root) { + return _root->pick(p, delta, flags); + } else { + std::cerr << "Drawing::pick: _root is null!" << std::endl; + } + return nullptr; +} + +void +Drawing::_pickItemsForCaching() +{ + size_t used = 0; + CandidateList::iterator i; + for (i = _candidate_items.begin(); i != _candidate_items.end(); ++i) { + if (used + i->cache_size > _cache_budget) break; + used += i->cache_size; + } + + std::set<DrawingItem*> to_cache; + for (CandidateList::iterator j = _candidate_items.begin(); j != i; ++j) { + j->item->setCached(true); + to_cache.insert(j->item); + } + // Everything which is now in _cached_items but not in to_cache must be uncached + // Note that calling setCached on an item modifies _cached_items + // TODO: find a way to avoid the set copy + std::set<DrawingItem*> to_uncache; + std::set_difference(_cached_items.begin(), _cached_items.end(), + to_cache.begin(), to_cache.end(), + std::inserter(to_uncache, to_uncache.end())); + for (auto j : to_uncache) { + j->setCached(false); + } +} + +/* + * Return average color over area. Used by Calligraphic, Dropper, and Spray tools. + */ +void +Drawing::average_color(Geom::IntRect const &area, double &R, double &G, double &B, double &A) +{ + auto surface = Cairo::ImageSurface::create(Cairo::FORMAT_ARGB32, area.width(), area.height()); + Inkscape::DrawingContext dc(surface->cobj(), area.min()); + render(dc, area); + + ink_cairo_surface_average_color_premul(surface->cobj(), R, G, B, A); +} + + +} // end 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 : |