1 files changed, 148 insertions, 0 deletions
diff --git a/src/ui/widget/shapeicon.cpp b/src/ui/widget/shapeicon.cpp
new file mode 100644
index 0000000..7a451ab
--- /dev/null
+++ b/src/ui/widget/shapeicon.cpp
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Authors:
+ *   Martin Owens
+ *
+ * Copyright (C) 2020 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+
+#include <gtkmm/cellrenderer.h>
+#include <gtkmm/enums.h>
+#include "color.h"
+#include "ui/util.h"
+#include "ui/widget/shapeicon.h"
+#include "ui/icon-loader.h"
+
+namespace Inkscape {
+namespace UI {
+namespace Widget {
+
+/*
+ * This is a type of CellRenderer which you might expect to inherit from the
+ * pixbuf CellRenderer, but we actually need to write a Cairo surface directly
+ * in order to maintain HiDPI sharpness in icons. Upstream Gtk have made it clear
+ * that CellRenderers are going away in Gtk4 so they aren't interested in fixing
+ * rendering problems like the one in CellRendererPixbuf.
+ *
+ * See: https://gitlab.gnome.org/GNOME/gtk/-/issues/613
+ */
+
+void CellRendererItemIcon::render_vfunc(const Cairo::RefPtr<Cairo::Context>& cr, 
+                                      Gtk::Widget& widget,
+                                      const Gdk::Rectangle& background_area,
+                                      const Gdk::Rectangle& cell_area,
+                                      Gtk::CellRendererState flags)
+{
+    property_mode() = Gtk::CELL_RENDERER_MODE_ACTIVATABLE;
+
+    std::string shape_type = _property_shape_type.get_value();
+    if (shape_type == "-") return; // "-" is an explicit request not to draw any icon
+
+    std::string highlight;
+    auto color = _property_color.get_value();
+    if (color == 0) {
+        auto style_context = widget.get_style_context();
+        Gdk::RGBA fg = style_context->get_color(cell_flags_to_state_flags(flags));
+        highlight = fg.to_string();
+    }
+    else {
+        highlight = SPColor(color).toString();
+    }
+    std::string cache_id = shape_type + "-" + highlight;
+
+    // if the icon isn't cached, render it to a pixbuf
+    int scale = widget.get_scale_factor();
+    if ( !_icon_cache[cache_id] ) { 
+        _icon_cache[cache_id] = sp_get_shape_icon(shape_type, Gdk::RGBA(highlight), _size, scale);
+    }
+    g_return_if_fail(_icon_cache[cache_id]);
+  
+    // Center the icon in the cell area
+    int x = cell_area.get_x() + int((cell_area.get_width() - _size) * 0.5);
+    int y = cell_area.get_y() + int((cell_area.get_height() - _size) * 0.5);
+
+    // Paint the pixbuf to a cairo surface to get HiDPI support
+    paint_icon(cr, widget, _icon_cache[cache_id], x, y);
+
+    // Create an overlay icon
+    int clipmask = _property_clipmask.get_value();
+    if (clipmask > 0) {
+        if (!_clip_overlay) {
+            _clip_overlay = sp_get_icon_pixbuf("overlay-clip", Gtk::ICON_SIZE_MENU, scale);
+        }
+        if (!_mask_overlay) {
+            _mask_overlay = sp_get_icon_pixbuf("overlay-mask", Gtk::ICON_SIZE_MENU, scale);
+        }
+        if (!_both_overlay) {
+            _both_overlay = sp_get_icon_pixbuf("overlay-clipmask", Gtk::ICON_SIZE_MENU, scale);
+        }
+
+        if (clipmask == OVERLAY_CLIP && _clip_overlay) {
+            paint_icon(cr, widget, _clip_overlay, x, y);
+        }
+        if (clipmask == OVERLAY_MASK && _mask_overlay) {
+            paint_icon(cr, widget, _mask_overlay, x, y);
+        }
+        if (clipmask == OVERLAY_BOTH && _both_overlay) {
+            paint_icon(cr, widget, _both_overlay, x, y);
+        }
+    }
+
+}
+
+void CellRendererItemIcon::paint_icon(const Cairo::RefPtr<Cairo::Context>& cr,
+                                      Gtk::Widget& widget,
+                                      Glib::RefPtr<Gdk::Pixbuf> pixbuf,
+                                      int x, int y)
+{
+    cairo_surface_t *surface = gdk_cairo_surface_create_from_pixbuf(
+            pixbuf->gobj(), 0, widget.get_window()->gobj());
+    if (!surface) return;
+    cairo_set_source_surface(cr->cobj(), surface, x, y);
+    cr->set_operator(Cairo::OPERATOR_ATOP);
+    cr->rectangle(x, y, _size, _size);
+    cr->fill();
+    cairo_surface_destroy(surface); // free!
+}
+
+void CellRendererItemIcon::get_preferred_height_vfunc(Gtk::Widget& widget, int& min_h, int& nat_h) const
+{
+    min_h = _size;
+    nat_h = _size + 4;
+}   
+
+void CellRendererItemIcon::get_preferred_width_vfunc(Gtk::Widget& widget, int& min_w, int& nat_w) const
+{
+    min_w = _size;
+    nat_w = _size + 4;
+}   
+
+bool CellRendererItemIcon::activate_vfunc(GdkEvent* event,
+                                Gtk::Widget& widget,
+                                const Glib::ustring& path,
+                                const Gdk::Rectangle& background_area,
+                                const Gdk::Rectangle& cell_area,
+                                Gtk::CellRendererState flags) {
+    _signal_activated.emit(path);
+    return true;
+}
+
+} // namespace Widget
+} // namespace UI
+} // 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 :
+
+