- The problem with CairoWidget was that it did scale a pixmap of ~100x100

with a *factor* of ~640x480. That means ~64*48*10^6*3 bytes = a ~1.1 Gb RAM pixmap.
The problem didn't show in versions of cairo >= 1.2 because it automagically
clips (yeah, cairo programmers *are* smart :-))
It is temporary fixed for the moment, will be made better asap.


git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@892 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/cairo_widget.cc

@@ -27,6 +27,7 @@
 #include <gdkmm/window.h>
 
 #include <cassert>
+#include <iostream>
 #include <memory>
 
 using namespace sgpem;
@@ -73,6 +74,7 @@ CairoWidget::update(const History& history)
   cairo_t* ctx = gdk_cairo_create(_buf->gobj());
 
   // do the drawing...
+  std::cout << " Dimensions, w : " << _w << ", h : " << _h << std::endl;
   cairo_scale(ctx, _w, _h);
   draw_widget(ctx);
   cairo_destroy(ctx);
@@ -133,6 +135,16 @@ CairoWidget::on_size_allocate(const Gtk::Allocation& allocation)
 }
 
 
+void
+CairoWidget::on_size_request(Gtk::Requisition* requisition)
+{
+  *requisition = Gtk::Requisition();
+
+  requisition->width  = _w;
+  requisition->height = _h;
+}
+
+
 bool
 CairoWidget::on_expose_event(GdkEventExpose* event)
 {

src/cairo_widget.hh

@@ -44,6 +44,7 @@ namespace sgpem
 
     virtual void on_realize();
     virtual void on_size_allocate(const Gtk::Allocation& allocation);
+    virtual void on_size_request(Gtk::Requisition* request);
     virtual bool on_expose_event(GdkEventExpose* event);
     virtual bool on_button_press_event(GdkEventButton* event);
     virtual void draw_widget(cairo_t* ctx) = 0;

src/simulation_widget.cc

@@ -46,13 +46,13 @@ SimulationWidget::draw_widget(cairo_t* ctx)
   // NOTE: just to try
   CairoElements ce(ctx);
 
-  Rectangle area = { 30, 30, 100, 100 };
+  Rectangle area = { 0.3, 0.3, 1.0, 1.0 };
   ce.draw_container(area);
 
   Color red = { 1, 0, 0 };
-  Point center = { 25, 25 };
+  Point center = { 0.25, 0.25 };
 
-  ce.draw_3dsphere(center, 20, red);
+  ce.draw_3dsphere(center, 0.20, red);
 }
 
 
@@ -63,10 +63,12 @@ SimulationWidget::calc_size(const History& history, size_t& width, size_t& heigh
   width = get_allocation().get_width();
   height = get_allocation().get_height();
 
+/*
 #ifndef NDEBUG
   using namespace std;
   clog << " [DD] New allocation event on " << hex << this << ": " 
        << dec << width << 'x' << height << endl;
 #endif
+*/
 
 }