From: mental <mental@users.sourceforge.net>
Date: Fri, 9 Mar 2007 00:25:51 +0000 (+0000)
Subject: specialize MaybeStorage for Rect, and start using reference maybes to
X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=385709d739bf6cc29c933d533868f011ebc9fd73;p=inkscape.git

specialize MaybeStorage for Rect, and start using reference maybes to
avoid some copies
---

diff --git a/src/libnr/nr-rect.cpp b/src/libnr/nr-rect.cpp
index 21d3f470a..9047e4e1c 100644
--- a/src/libnr/nr-rect.cpp
+++ b/src/libnr/nr-rect.cpp
@@ -284,7 +284,7 @@ void Rect::expandTo(Point p) {
 }
 
 /** Returns the set of points shared by both rectangles. */
-Maybe<Rect> Rect::intersection(Maybe<Rect> const &a, Maybe<Rect> const &b) {
+Maybe<Rect> intersection(Maybe<Rect const &> a, Maybe<Rect const &> b) {
     if ( !a || !b ) {
         return Nothing();
     } else {
@@ -301,7 +301,7 @@ Maybe<Rect> Rect::intersection(Maybe<Rect> const &a, Maybe<Rect> const &b) {
 }
 
 /** returns the smallest rectangle containing both rectangles */
-Rect Rect::union_bounds(Rect const &a, Rect const &b) {
+Rect union_bounds(Rect const &a, Rect const &b) {
     Rect r;
     for ( int i=0 ; i < 2 ; i++ ) {
         r._min[i] = MIN(a._min[i], b._min[i]);
diff --git a/src/libnr/nr-rect.h b/src/libnr/nr-rect.h
index dd7caa897..5e2332bf2 100644
--- a/src/libnr/nr-rect.h
+++ b/src/libnr/nr-rect.h
@@ -125,36 +125,6 @@ public:
         _max[NR::Y] += by;
     }
 
-    /** Returns the set of points shared by both rectangles. */
-    static Maybe<Rect> intersection(Maybe<Rect> const &a, Maybe<Rect> const &b);
-
-    /** Returns the smallest rectangle that encloses both rectangles. */
-    static Maybe<Rect> union_bounds(Maybe<Rect> const &a, Maybe<Rect> const &b)
-    {
-        if (!a) {
-            return b;
-        } else if (!b) {
-            return a;
-        } else {
-            return union_bounds(*a, *b);
-        }
-    }
-    static Rect union_bounds(Maybe<Rect> const &a, Rect const &b) {
-        if (a) {
-            return union_bounds(*a, b);
-        } else {
-            return b;
-        }
-    }
-    static Rect union_bounds(Rect const &a, Maybe<Rect> const &b) {
-        if (b) {
-            return union_bounds(a, *b);
-        } else {
-            return a;
-        }
-    }
-    static Rect union_bounds(Rect const &a, Rect const &b);
-
     /** Scales the rect by s, with origin at 0, 0 */
     inline Rect operator*(double const s) const {
         return Rect(s * min(), s * max());
@@ -172,6 +142,8 @@ public:
     friend inline std::ostream &operator<<(std::ostream &out_file, NR::Rect const &in_rect);
 
 private:
+    Rect(Nothing) : _min(1, 1), _max(-1, -1) {}
+
     static double _inf() {
         return std::numeric_limits<double>::infinity();
     }
@@ -203,10 +175,55 @@ private:
 
     Point _min, _max;
 
-    /* evil, but temporary */
-    friend class Maybe<Rect>;
+    friend class MaybeStorage<Rect>;
 };
 
+template <>
+class MaybeStorage<Rect> {
+public:
+    MaybeStorage() : _rect(Nothing()) {}
+    MaybeStorage(Rect const &rect) : _rect(rect) {}
+
+    bool is_nothing() const {
+        return _rect._min[X] > _rect._max[X];
+    }
+    Rect const &value() const { return _rect; }
+    Rect &value() { return _rect; }
+
+private:
+    Rect _rect;
+};
+
+/** Returns the set of points shared by both rectangles. */
+Maybe<Rect> intersection(Maybe<Rect const &> a, Maybe<Rect const &> b);
+
+/** Returns the smallest rectangle that encloses both rectangles. */
+Rect union_bounds(Rect const &a, Rect const &b);
+inline Rect union_bounds(Maybe<Rect const &> a, Rect const &b) {
+    if (a) {
+        return union_bounds(*a, b);
+    } else {
+        return b;
+    }
+}
+inline Rect union_bounds(Rect const &a, Maybe<Rect const &> b) {
+    if (b) {
+        return union_bounds(a, *b);
+    } else {
+        return a;
+    }
+}
+inline Maybe<Rect> union_bounds(Maybe<Rect const &> a, Maybe<Rect const &> b)
+{
+    if (!a) {
+        return b;
+    } else if (!b) {
+        return a;
+    } else {
+        return union_bounds(*a, *b);
+    }
+}
+
 /** A function to print out the rectange if sent to an output
     stream. */
 inline std::ostream
diff --git a/src/selection-chemistry.cpp b/src/selection-chemistry.cpp
index 57fa6bb84..a65c9b290 100644
--- a/src/selection-chemistry.cpp
+++ b/src/selection-chemistry.cpp
@@ -598,7 +598,7 @@ enclose_items(const GSList *items)
 
     NR::Maybe<NR::Rect> r = NR::Nothing();
     for (GSList const *i = items; i; i = i->next) {
-        r = NR::Rect::union_bounds(r, sp_item_bbox_desktop((SPItem *) i->data));
+        r = NR::union_bounds(r, sp_item_bbox_desktop((SPItem *) i->data));
     }
     return r;
 }
diff --git a/src/selection.cpp b/src/selection.cpp
index 5c60e5f41..49934cfd3 100644
--- a/src/selection.cpp
+++ b/src/selection.cpp
@@ -320,7 +320,7 @@ NR::Rect Selection::bounds() const
 
     NR::Maybe<NR::Rect> bbox = NR::Nothing();
     for ( GSList const *i = items ; i != NULL ; i = i->next ) {
-        bbox = NR::Rect::union_bounds(bbox, sp_item_bbox_desktop(SP_ITEM(i->data)));
+        bbox = NR::union_bounds(bbox, sp_item_bbox_desktop(SP_ITEM(i->data)));
     }
 
     // TODO: return NR::Maybe<NR::Rect>
diff --git a/src/ui/view/edit-widget.cpp b/src/ui/view/edit-widget.cpp
index 78e706a25..f386aefcc 100644
--- a/src/ui/view/edit-widget.cpp
+++ b/src/ui/view/edit-widget.cpp
@@ -1395,7 +1395,7 @@ EditWidget::updateScrollbars (double scale)
     NR::Rect const viewbox = _svg_canvas.spobj()->getViewbox();
 
     /* Viewbox is always included into scrollable region */
-    carea = NR::Rect::union_bounds(carea, viewbox);
+    carea = NR::union_bounds(carea, viewbox);
 
     Gtk::Adjustment *adj = _bottom_scrollbar.get_adjustment();
     adj->set_value(viewbox.min()[NR::X]);
diff --git a/src/widgets/desktop-widget.cpp b/src/widgets/desktop-widget.cpp
index eb813a2a2..76313f771 100644
--- a/src/widgets/desktop-widget.cpp
+++ b/src/widgets/desktop-widget.cpp
@@ -1289,7 +1289,7 @@ sp_desktop_widget_update_scrollbars (SPDesktopWidget *dtw, double scale)
     NR::Rect viewbox = dtw->canvas->getViewbox();
 
     /* Viewbox is always included into scrollable region */
-    carea = NR::Rect::union_bounds(carea, viewbox);
+    carea = NR::union_bounds(carea, viewbox);
 
     set_adjustment(dtw->hadj, carea.min()[NR::X], carea.max()[NR::X],
                    viewbox.dimensions()[NR::X],