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-rw-r--r--src/display/drawing-shape.cpp438
1 files changed, 438 insertions, 0 deletions
diff --git a/src/display/drawing-shape.cpp b/src/display/drawing-shape.cpp
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+++ b/src/display/drawing-shape.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * @file
+ * Shape (styled path) belonging to an SVG drawing.
+ *//*
+ * Authors:
+ * Krzysztof KosiƄski <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 :