Rewrite NRArenaItem hierarchy into C++

(bzr r10347.1.21)

1 files changed, 340 insertions, 0 deletions

diff --git a/src/display/drawing-shape.cpp b/src/display/drawing-shape.cpp
new file mode 100644
index 000000000..1a56eea9b
--- /dev/null
+++ b/src/display/drawing-shape.cpp
@@ -0,0 +1,340 @@
+/**
+ * @file
+ * @brief Shape (styled path) belonging to an SVG drawing
+ *//*
+ * Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2011 Authors
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include <glib.h>
+#include <2geom/curves.h>
+#include <2geom/pathvector.h>
+#include <2geom/svg-path.h>
+#include <2geom/svg-path-parser.h>
+
+#include "display/cairo-utils.h"
+#include "display/canvas-arena.h"
+#include "display/canvas-bpath.h"
+#include "display/curve.h"
+#include "display/drawing-context.h"
+#include "display/drawing-group.h"
+#include "display/drawing-shape.h"
+#include "display/nr-arena.h"
+#include "helper/geom-curves.h"
+#include "helper/geom.h"
+#include "libnr/nr-convert2geom.h"
+#include "preferences.h"
+#include "style.h"
+#include "svg/svg.h"
+
+namespace Inkscape {
+
+DrawingShape::DrawingShape(Drawing *drawing)
+    : DrawingItem(drawing)
+    , _curve(NULL)
+    , _style(NULL)
+    , _last_pick(NULL)
+    , _repick_after(0)
+{}
+
+DrawingShape::~DrawingShape()
+{
+    if (_style)
+        sp_style_unref(_style);
+    if (_curve)
+        _curve->unref();
+}
+
+void
+DrawingShape::setPath(SPCurve *curve)
+{
+    _markForRendering();
+
+    if (_curve) {
+        _curve->unref();
+        _curve = NULL;
+    }
+    if (curve) {
+        _curve = curve;
+        curve->ref();
+    }
+
+    _markForUpdate(STATE_ALL, false);
+}
+
+void
+DrawingShape::setStyle(SPStyle *style)
+{
+    _setStyleCommon(_style, style);
+    _nrstyle.set(style);
+}
+
+void
+DrawingShape::setPaintBox(Geom::Rect const &box)
+{
+    _paintbox = box;
+    _markForUpdate(STATE_ALL, false);
+}
+
+unsigned
+DrawingShape::_updateItem(Geom::IntRect const &area, UpdateContext const &ctx, unsigned flags, unsigned reset)
+{
+    Geom::OptRect boundingbox;
+
+    unsigned beststate = STATE_ALL;
+
+    // update markers
+    for (ChildrenList::iterator i = _children.begin(); i != _children.end(); ++i) {
+        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 (ChildrenList::iterator i = _children.begin(); i != _children.end(); ++i) {
+                    _bbox.unionWith(i->geometricBounds());
+                }
+            }
+        }
+        return (flags | _state);
+    }
+
+    boundingbox = Geom::OptRect();
+    bool outline = (_drawing->rendermode == RENDERMODE_OUTLINE);
+
+    // 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() ||
+        (( _nrstyle.fill.type != NRStyle::PAINT_NONE ) &&
+         ( _nrstyle.stroke.type != NRStyle::PAINT_NONE && !outline) ))
+    {
+        return STATE_ALL;
+    }
+
+    if (beststate & STATE_BBOX) {
+        for (ChildrenList::iterator i = _children.begin(); i != _children.end(); ++i) {
+            _bbox.unionWith(i->geometricBounds());
+        }
+    }
+
+    return STATE_ALL;
+}
+
+void
+DrawingShape::_renderItem(DrawingContext &ct, Geom::IntRect const &area, unsigned flags)
+{
+    if (!_curve || !_style) return;
+    if (!area.intersects(_bbox)) return; // skip if not within bounding box
+
+    bool outline = (_drawing->rendermode == RENDERMODE_OUTLINE);
+
+    if (outline) {
+        guint32 rgba = _drawing->outlinecolor;
+
+        {   Inkscape::DrawingContext::Save save(ct);
+            ct.transform(_ctm);
+            ct.path(_curve->get_pathvector());
+        }
+        {   Inkscape::DrawingContext::Save save(ct);
+            ct.setSource(rgba);
+            ct.setLineWidth(0.5);
+            ct.setTolerance(1.25);
+            ct.stroke();
+        }
+    } else {
+        bool has_stroke, has_fill;
+        // we assume the context has no path
+        Inkscape::DrawingContext::Save save(ct);
+        ct.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
+        has_fill   = _nrstyle.prepareFill(ct, _paintbox);
+        has_stroke = _nrstyle.prepareStroke(ct, _paintbox);
+        has_stroke &= (_nrstyle.stroke_width != 0);
+
+        if (has_fill || has_stroke) {
+            // TODO: remove segments outside of bbox when no dashes present
+            ct.path(_curve->get_pathvector());
+            if (has_fill) {
+                _nrstyle.applyFill(ct);
+                ct.fillPreserve();
+            }
+            if (has_stroke) {
+                _nrstyle.applyStroke(ct);
+                ct.strokePreserve();
+            }
+            ct.newPath(); // clear path
+        } // has fill or stroke pattern
+    }
+
+    // marker rendering
+    for (ChildrenList::iterator i = _children.begin(); i != _children.end(); ++i) {
+        i->render(ct, area, flags);
+    }
+}
+
+void
+DrawingShape::_clipItem(DrawingContext &ct, Geom::IntRect const &area)
+{
+    if (!_curve) return;
+
+    Inkscape::DrawingContext::Save save(ct);
+    // handle clip-rule
+    if (_style) {
+        if (_style->clip_rule.computed == SP_WIND_RULE_EVENODD) {
+            ct.setFillRule(CAIRO_FILL_RULE_EVEN_ODD);
+        } else {
+            ct.setFillRule(CAIRO_FILL_RULE_WINDING);
+        }
+    }
+    ct.transform(_ctm);
+    ct.path(_curve->get_pathvector());
+    ct.fill();
+}
+
+DrawingItem *
+DrawingShape::_pickItem(Geom::Point const &p, double delta)
+{
+    if (_repick_after > 0)
+        --_repick_after;
+
+    if (_repick_after > 0) // we are a slow, huge path. skip this pick, returning what was returned last time
+        return _last_pick;
+
+    if (!_curve) return NULL;
+    if (!_style) return NULL;
+
+    bool outline = (_drawing->rendermode == RENDERMODE_OUTLINE);
+
+    if (SP_SCALE24_TO_FLOAT(_style->opacity.value) == 0 && !outline) 
+        // fully transparent, no pick unless outline mode
+        return NULL;
+
+    GTimeVal tstart, tfinish;
+    g_get_current_time (&tstart);
+
+    double width;
+    if (outline) {
+        width = 0.5;
+    } else if (_nrstyle.stroke.type != NRStyle::PAINT_NONE && _nrstyle.stroke.opacity > 1e-3) {
+        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 = (_nrstyle.fill.type != NRStyle::PAINT_NONE 
+             && _nrstyle.fill.opacity > 1e-3 && !outline);
+
+    if (_drawing->canvasarena) {
+        Geom::Rect viewbox = _drawing->canvasarena->item.canvas->getViewbox();
+        viewbox.expandBy (width);
+        pathv_matrix_point_bbox_wind_distance(_curve->get_pathvector(), _ctm, p, NULL, needfill? &wind : NULL, &dist, 0.5, &viewbox);
+    } else {
+        pathv_matrix_point_bbox_wind_distance(_curve->get_pathvector(), _ctm, p, NULL, needfill? &wind : NULL, &dist, 0.5, NULL);
+    }
+
+    g_get_current_time (&tfinish);
+    glong this_pick = (tfinish.tv_sec - tstart.tv_sec) * 1000000 + (tfinish.tv_usec - tstart.tv_usec);
+    //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 (!_style->fill_rule.computed) {
+            if (wind != 0) {
+                _last_pick = this;
+                return this;
+            }
+        } else {
+            if (wind & 0x1) {
+                _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 (ChildrenList::iterator i = _children.begin(); i != _children.end(); ++i) {
+        DrawingItem *ret = i->pick(p, delta, false);
+        if (ret) {
+            _last_pick = this;
+            return this;
+        }
+    }
+
+    _last_pick = NULL;
+    return NULL;
+}
+
+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 :