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Diffstat (limited to '')
| -rw-r--r-- | src/display/drawing-shape.cpp | 438 |
1 files changed, 438 insertions, 0 deletions
diff --git a/src/display/drawing-shape.cpp b/src/display/drawing-shape.cpp new file mode 100644 index 0000000..5faabde --- /dev/null +++ b/src/display/drawing-shape.cpp @@ -0,0 +1,438 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** + * @file + * Shape (styled path) belonging to an SVG drawing. + *//* + * Authors: + * Krzysztof Kosiński <tweenk.pl@gmail.com> + * + * Copyright (C) 2011 Authors + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include <glibmm.h> +#include <2geom/curves.h> +#include <2geom/pathvector.h> +#include <2geom/path-sink.h> +#include <2geom/svg-path-parser.h> + +#include "drawing-shape.h" + +#include "preferences.h" +#include "style.h" + +#include "display/cairo-utils.h" +#include "display/curve.h" +#include "display/drawing.h" +#include "display/drawing-context.h" +#include "display/drawing-group.h" +#include "display/control/canvas-item-drawing.h" + +#include "helper/geom-curves.h" +#include "helper/geom.h" + +#include "svg/svg.h" +#include "ui/widget/canvas.h" // Canvas area + +namespace Inkscape { + +DrawingShape::DrawingShape(Drawing &drawing) + : DrawingItem(drawing) + , _curve(nullptr) + , _last_pick(nullptr) + , _repick_after(0) +{} + +DrawingShape::~DrawingShape() +{ +} + +void +DrawingShape::setPath(SPCurve *curve) +{ + _markForRendering(); + + _curve = curve ? curve->ref() : nullptr; + + _markForUpdate(STATE_ALL, false); +} + +void +DrawingShape::setStyle(SPStyle *style, SPStyle *context_style) +{ + DrawingItem::setStyle(style, context_style); // Must be first + _nrstyle.set(_style, _context_style); +} + +void +DrawingShape::setChildrenStyle(SPStyle* context_style) +{ + DrawingItem::setChildrenStyle( context_style ); + _nrstyle.set(_style, _context_style); +} + +unsigned +DrawingShape::_updateItem(Geom::IntRect const &area, UpdateContext const &ctx, unsigned flags, unsigned reset) +{ + Geom::OptRect boundingbox; + + unsigned beststate = STATE_ALL; + + // update markers + for (auto & i : _children) { + i.update(area, ctx, flags, reset); + } + + if (!(flags & STATE_RENDER)) { + /* We do not have to create rendering structures */ + if (flags & STATE_BBOX) { + if (_curve) { + boundingbox = bounds_exact_transformed(_curve->get_pathvector(), ctx.ctm); + if (boundingbox) { + _bbox = boundingbox->roundOutwards(); + } else { + _bbox = Geom::OptIntRect(); + } + } + if (beststate & STATE_BBOX) { + for (auto & i : _children) { + _bbox.unionWith(i.geometricBounds()); + } + } + } + return (flags | _state); + } + + boundingbox = Geom::OptRect(); + bool outline = _drawing.outline() || _drawing.outlineOverlay(); + + // clear Cairo data to force update + _nrstyle.update(); + + if (_curve) { + boundingbox = bounds_exact_transformed(_curve->get_pathvector(), ctx.ctm); + + if (boundingbox && (_nrstyle.stroke.type != NRStyle::PAINT_NONE || outline)) { + float width, scale; + scale = ctx.ctm.descrim(); + width = std::max(0.125f, _nrstyle.stroke_width * scale); + if ( fabs(_nrstyle.stroke_width * scale) > 0.01 ) { // FIXME: this is always true + boundingbox->expandBy(width); + } + // those pesky miters, now + float miterMax = width * _nrstyle.miter_limit; + if ( miterMax > 0.01 ) { + // grunt mode. we should compute the various miters instead + // (one for each point on the curve) + boundingbox->expandBy(miterMax); + } + } + } + + _bbox = boundingbox ? boundingbox->roundOutwards() : Geom::OptIntRect(); + + if (!_curve || + !_style || + _curve->is_empty()) + { + return STATE_ALL; + } + + if (beststate & STATE_BBOX) { + for (auto & i : _children) { + _bbox.unionWith(i.geometricBounds()); + } + } + return STATE_ALL; +} + +void +DrawingShape::_renderFill(DrawingContext &dc) +{ + Inkscape::DrawingContext::Save save(dc); + dc.transform(_ctm); + + bool has_fill = _nrstyle.prepareFill(dc, _item_bbox, _fill_pattern); + + if( has_fill ) { + dc.path(_curve->get_pathvector()); + _nrstyle.applyFill(dc); + dc.fillPreserve(); + dc.newPath(); // clear path + } +} + +void +DrawingShape::_renderStroke(DrawingContext &dc) +{ + Inkscape::DrawingContext::Save save(dc); + dc.transform(_ctm); + + bool has_stroke = _nrstyle.prepareStroke(dc, _item_bbox, _stroke_pattern); + if (!_style->stroke_extensions.hairline) { + has_stroke &= (_nrstyle.stroke_width != 0); + } + + if( has_stroke ) { + // TODO: remove segments outside of bbox when no dashes present + dc.path(_curve->get_pathvector()); + if (_style && _style->vector_effect.stroke) { + dc.restore(); + dc.save(); + } + _nrstyle.applyStroke(dc); + + // If the stroke is a hairline, set it to exactly 1px on screen. + // If visible hairline mode is on, make sure the line is at least 1px. + if (_drawing.visibleHairlines() || _style->stroke_extensions.hairline) { + double pixel_size_x = 1.0, pixel_size_y = 1.0; + dc.device_to_user_distance(pixel_size_x, pixel_size_y); + if (_style->stroke_extensions.hairline || _nrstyle.stroke_width < std::min(pixel_size_x, pixel_size_y)) { + dc.setHairline(); + } + } + + dc.strokePreserve(); + dc.newPath(); // clear path + } +} + +void +DrawingShape::_renderMarkers(DrawingContext &dc, Geom::IntRect const &area, unsigned flags, DrawingItem *stop_at) +{ + // marker rendering + for (auto & i : _children) { + i.render(dc, area, flags, stop_at); + } +} + +unsigned +DrawingShape::_renderItem(DrawingContext &dc, Geom::IntRect const &area, unsigned flags, DrawingItem *stop_at) +{ + if (!_curve || !_style) return RENDER_OK; + if (!area.intersects(_bbox)) return RENDER_OK; // skip if not within bounding box + + bool outline = _drawing.outline(); + + if (outline) { + guint32 rgba = _drawing.outlinecolor; + + // paint-order doesn't matter + { Inkscape::DrawingContext::Save save(dc); + dc.transform(_ctm); + dc.path(_curve->get_pathvector()); + } + { Inkscape::DrawingContext::Save save(dc); + dc.setSource(rgba); + dc.setLineWidth(0.5); + dc.setTolerance(0.5); + dc.stroke(); + } + + _renderMarkers(dc, area, flags, stop_at); + return RENDER_OK; + + } + + if( _nrstyle.paint_order_layer[0] == NRStyle::PAINT_ORDER_NORMAL ) { + // This is the most common case, special case so we don't call get_pathvector(), etc. twice + + { + // we assume the context has no path + Inkscape::DrawingContext::Save save(dc); + dc.transform(_ctm); + + + // update fill and stroke paints. + // this cannot be done during nr_arena_shape_update, because we need a Cairo context + // to render svg:pattern + bool has_fill = _nrstyle.prepareFill(dc, _item_bbox, _fill_pattern); + bool has_stroke = _nrstyle.prepareStroke(dc, _item_bbox, _stroke_pattern); + has_stroke &= (_nrstyle.stroke_width != 0 || _nrstyle.hairline == true); + if (has_fill || has_stroke) { + dc.path(_curve->get_pathvector()); + // TODO: remove segments outside of bbox when no dashes present + if (has_fill) { + _nrstyle.applyFill(dc); + dc.fillPreserve(); + } + if (_style && _style->vector_effect.stroke) { + dc.restore(); + dc.save(); + } + if (has_stroke) { + _nrstyle.applyStroke(dc); + + // If the draw mode is set to visible hairlines, don't let anything get smaller + // than half a pixel. + if (_drawing.visibleHairlines()) { + double half_pixel_size = 0.5, trash = 0.5; + dc.device_to_user_distance(half_pixel_size, trash); + if (_nrstyle.stroke_width < half_pixel_size) { + dc.setLineWidth(half_pixel_size); + } + } + + dc.strokePreserve(); + } + dc.newPath(); // clear path + } // has fill or stroke pattern + } + _renderMarkers(dc, area, flags, stop_at); + return RENDER_OK; + + } + + // Handle different paint orders + for (auto & i : _nrstyle.paint_order_layer) { + switch (i) { + case NRStyle::PAINT_ORDER_FILL: + _renderFill(dc); + break; + case NRStyle::PAINT_ORDER_STROKE: + _renderStroke(dc); + break; + case NRStyle::PAINT_ORDER_MARKER: + _renderMarkers(dc, area, flags, stop_at); + break; + default: + // PAINT_ORDER_AUTO Should not happen + break; + } + } + return RENDER_OK; +} + +void DrawingShape::_clipItem(DrawingContext &dc, Geom::IntRect const & /*area*/) +{ + if (!_curve) return; + + Inkscape::DrawingContext::Save save(dc); + // handle clip-rule + if (_style) { + if (_style->clip_rule.computed == SP_WIND_RULE_EVENODD) { + dc.setFillRule(CAIRO_FILL_RULE_EVEN_ODD); + } else { + dc.setFillRule(CAIRO_FILL_RULE_WINDING); + } + } + dc.transform(_ctm); + dc.path(_curve->get_pathvector()); + dc.fill(); +} + +DrawingItem * +DrawingShape::_pickItem(Geom::Point const &p, double delta, unsigned flags) +{ + if (_repick_after > 0) + --_repick_after; + + if (_repick_after > 0) { // we are a slow, huge path + return _last_pick; // skip this pick, returning what was returned last time + } + + if (!_curve) return nullptr; + if (!_style) return nullptr; + bool outline = _drawing.outline() || _drawing.outlineOverlay() || _drawing.getOutlineSensitive(); + bool pick_as_clip = flags & PICK_AS_CLIP; + + if (SP_SCALE24_TO_FLOAT(_style->opacity.value) == 0 && !outline && !pick_as_clip) { + // fully transparent, no pick unless outline mode + return nullptr; + } + + gint64 tstart = g_get_monotonic_time(); + + double width; + if (pick_as_clip) { + width = 0; // no width should be applied to clip picking + // this overrides display mode and stroke style considerations + } else if (outline) { + width = 0.5; // in outline mode, everything is stroked with the same 0.5px line width + } else if (_nrstyle.stroke.type != NRStyle::PAINT_NONE && _nrstyle.stroke.opacity > 1e-3) { + // for normal picking calculate the distance corresponding top the stroke width + // FIXME BUG: this is incorrect for transformed strokes + float const scale = _ctm.descrim(); + width = std::max(0.125f, _nrstyle.stroke_width * scale) / 2; + } else { + width = 0; + } + + double dist = Geom::infinity(); + int wind = 0; + bool needfill = pick_as_clip || (_nrstyle.fill.type != NRStyle::PAINT_NONE && + _nrstyle.fill.opacity > 1e-3 && !outline); + bool wind_evenodd = pick_as_clip ? (_style->clip_rule.computed == SP_WIND_RULE_EVENODD) : + (_style->fill_rule.computed == SP_WIND_RULE_EVENODD); + + // actual shape picking + if (_drawing.getCanvasItemDrawing()) { + Geom::Rect viewbox = _drawing.getCanvasItemDrawing()->get_canvas()->get_area_world(); + viewbox.expandBy (width); + pathv_matrix_point_bbox_wind_distance(_curve->get_pathvector(), _ctm, p, nullptr, needfill? &wind : nullptr, &dist, 0.5, &viewbox); + } else { + pathv_matrix_point_bbox_wind_distance(_curve->get_pathvector(), _ctm, p, nullptr, needfill? &wind : nullptr, &dist, 0.5, nullptr); + } + + gint64 tfinish = g_get_monotonic_time(); + gint64 this_pick = tfinish - tstart; + //g_print ("pick time %lu\n", this_pick); + if (this_pick > 10000) { // slow picking, remember to skip several new picks + _repick_after = this_pick / 5000; + } + + // covered by fill? + if (needfill) { + if (wind_evenodd) { + if (wind & 0x1) { + _last_pick = this; + return this; + } + } else { + if (wind != 0) { + _last_pick = this; + return this; + } + } + } + + // close to the edge, as defined by strokewidth and delta? + // this ignores dashing (as if the stroke is solid) and always works as if caps are round + if (needfill || width > 0) { // if either fill or stroke visible, + if ((dist - width) < delta) { + _last_pick = this; + return this; + } + } + + // if not picked on the shape itself, try its markers + for (auto & i : _children) { + DrawingItem *ret = i.pick(p, delta, flags & ~PICK_STICKY); + if (ret) { + _last_pick = this; + return this; + } + } + + _last_pick = nullptr; + return nullptr; +} + +bool +DrawingShape::_canClip() +{ + return true; +} + +} // 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 : |