Adding upstream version 1.2.2.upstream/1.2.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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 :