- Add CairoElements

- Start code for double buffering in custom widgets, using
an off-screen pixmap. Problem: we don't know the height from the 
beginning


git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@798 3ecf2c5c-341e-0410-92b4-d18e462d057c

Makefile.am

@@ -271,6 +271,7 @@ sgpemv2_LDADD = \
 
 # Please keep this in sorted order:
 sgpemv2_SOURCES = \
+	src/cairo_elements.cc \
 	src/graphical_terminal_io.cc \
 	src/gui_builder.cc \
 	src/main.cc \
@@ -282,6 +283,7 @@ sgpemv2_SOURCES = \
 	src/text_simulation.cc
 
 noinst_HEADERS += \
+	src/cairo_elements.hh \
 	src/graphical_simulation.hh \
 	src/graphical_terminal_io.hh \
 	src/gui_builder.hh \

plugins/pyloader/src/python_policy.cc

@@ -173,9 +173,7 @@ PythonPolicy::wait_unlock() const throw(UserInterruptException)
   {
     Py_UNBLOCK_THREADS;
     usleep(WAIT_FOR); // hack'a'ton! magggggiccc nummmbeeerrrrrs!!
-    cout << "got here..." << endl;
     Py_BLOCK_THREADS;
-    cout << "wow I also got here!" << endl;
  
     PyObject* retval = PyObject_CallMethod(_adapter, "mutex_test_lock", NULL);
     assert(retval);

src/backend/scheduler.cc

@@ -212,7 +212,7 @@ Scheduler::step_forward(History& history, Policy& cpu_policy) throw(UserInterrup
 					// should  be done here as the first thing, instead than 
 					// directly after selecting them
 					if(current.get_total_cpu_time() - current.get_elapsed_time() > 0)
-						running_thread->decrease_remaining_time();
+						current.decrease_remaining_time();
 
 					// 2. mark threads that used all their allotted time as terminated
 					if(current.get_total_cpu_time() - current.get_elapsed_time() == 0)

src/cairo_elements.cc

@@ -0,0 +1,184 @@
+// src/cairo_elements.cc - Copyright 2005, 2006, University
+//               of Padova, dept. of Pure and Applied
+//               Mathematics
+//
+// This file is part of SGPEMv2.
+//
+// This is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// SGPEMv2 is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with SGPEMv2; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+#include "cairo_elements.hh"
+
+#include <cmath>
+
+using namespace sgpem;
+
+
+CairoElements::CairoElements(cairo_t* const ctx)
+  : _ctx(ctx)
+{
+}
+
+
+void 
+CairoElements::draw_3dsphere(const Point& center, float radius, const Color& cl)
+{
+  cairo_t*& cr = _ctx;
+  const float& x = center.x;
+  const float& y = center.y;
+  const float& r = cl.r;
+  const float& g = cl.g;
+  const float& b = cl.b;
+  
+  // Draw initial sphere perimeter
+  cairo_save(cr);
+  cairo_new_path(cr);
+  cairo_arc(cr, x, y, radius, 0, 2*M_PI);
+  cairo_pattern_t* grad = cairo_pattern_create_radial(x, y, radius, x, y, radius - .15);
+  cairo_pattern_add_color_stop_rgba(grad,  0, r - .2, g - .2, b - .2, 1);
+  cairo_pattern_add_color_stop_rgba(grad,  1,      r,      g,      b, 1);
+  cairo_set_source(cr, grad);
+  cairo_fill_preserve(cr);
+  cairo_pattern_destroy(grad);
+  cairo_set_source_rgba(cr, 0, 0, 0, 1);
+  cairo_set_line_width(cr, radius * .01);
+  cairo_stroke(cr);
+  cairo_restore(cr);
+  
+  // Internal gradient
+  cairo_save(cr);
+  grad = cairo_pattern_create_linear(x, y, x, y + radius);
+  cairo_pattern_add_color_stop_rgba(grad, 1, r - .4, g - .4, b - .4,  1);
+  cairo_pattern_add_color_stop_rgba(grad, 0,      r,      g,      b, .7);
+  cairo_set_source(cr, grad);
+  cairo_translate(cr, x*.2, (y + radius*8/9) * 1/3);
+  cairo_scale(cr, .8, 2./3);
+  cairo_arc(cr, x, y, radius, 0, 2*M_PI);
+  cairo_fill(cr);
+  cairo_pattern_destroy(grad);
+  cairo_restore(cr);
+	
+  // Internal glow
+  cairo_save(cr);
+  grad = cairo_pattern_create_linear(x, y - radius, x, y);
+  cairo_pattern_add_color_stop_rgba(grad,  0, 1, 1, 1, .9);
+  cairo_pattern_add_color_stop_rgba(grad,  1, 1, 1, 1, .2);
+  cairo_set_source(cr, grad);
+  cairo_translate(cr, x * .2, (y - radius*8/9) * 1/3);
+  cairo_scale(cr, .8, 2./3);
+  cairo_arc(cr, x, y, radius, 0, 2*M_PI);
+  cairo_fill(cr);
+  cairo_pattern_destroy(grad);
+  cairo_restore(cr);		
+}
+
+void 
+CairoElements::draw_3dcube(const Rectangle& area, const Color& cl)
+{
+  cairo_t*& cr = _ctx;
+  const float& x0 = area.x0;
+  const float& y0 = area.y0;
+  const float& w = area.w;
+  const float& h = area.h;
+
+
+  // FIXME : not implemented
+}
+
+
+void 
+CairoElements::draw_container(const Rectangle& area)
+{
+  cairo_t*& cr = _ctx;
+  const float& x0 = area.x0;
+  const float& y0 = area.y0;
+  const float& w = area.w;
+  const float& h = area.h;
+	
+  const double corner_radius = 0.05;
+  
+  cairo_save(cr);
+  cairo_new_path(cr);
+  cairo_move_to(cr, x0 + corner_radius, y0);
+	
+  // NW -> NE
+  cairo_line_to(cr, x0+w - corner_radius, y0);
+  cairo_curve_to(cr, x0+w, y0, x0+w, y0, x0+w, y0 + corner_radius);
+  // NE -> SE
+  cairo_line_to(cr, x0+w, y0+h - corner_radius);
+  cairo_curve_to(cr, x0+w, y0+h, x0+w, y0+h, x0+w - corner_radius, y0+h);
+  // SE -> SW
+  cairo_line_to(cr, x0 + corner_radius, y0+h);
+  cairo_curve_to(cr, x0, y0+h, x0, y0+h, x0, y0+h - corner_radius);
+  // SW -> NW
+  cairo_line_to(cr, x0, y0 + corner_radius);
+  cairo_curve_to(cr, x0, y0, x0, y0, x0 + corner_radius, y0);
+  cairo_close_path(cr);
+  
+  cairo_set_source_rgb(cr, 1, 1, 0.9);
+  cairo_fill_preserve(cr);
+  cairo_set_line_width(cr, .005);
+  cairo_set_source_rgb(cr, 0, 0, 0);
+  cairo_stroke(cr);
+  cairo_restore(cr);
+}
+
+
+void 
+CairoElements::draw_expandable(const Rectangle& area, bool expanded)
+{
+  cairo_t*& cr = _ctx;
+  const float& x0 = area.x0;
+  const float& y0 = area.y0;
+  const float& w = area.w;
+  const float& h = area.h;
+	
+  cairo_save(cr);
+
+  cairo_set_line_width(cr, .005);
+  cairo_set_source_rgb(cr, 1, 1, 1);
+  
+  cairo_new_path(cr);
+  cairo_rectangle(cr, x0, y0, w, h);
+  cairo_set_source_rgb(cr, 1, 1, 1);
+  cairo_fill_preserve(cr);
+  cairo_set_source_rgb(cr, 0, 0, 0);
+  cairo_stroke(cr);
+	
+  cairo_move_to(cr, x0 + w/10, y0 + h/2);
+  cairo_line_to(cr, x0 + w*9/10, y0 + h/2);
+  cairo_stroke(cr);
+  
+  if(!expanded) 
+    {
+      cairo_move_to(cr, x0 + w/2, y0 + h/10);
+      cairo_line_to(cr, x0 + w/2, y0 + h*9/10);
+      cairo_stroke(cr);
+    }
+  
+  cairo_restore(cr);
+}
+
+
+Rectangle draw_thread_status(const Point& top_left_crn, 
+                             const Thread& thread_info)
+{
+}
+
+
+Rectangle draw_process_status(const Point& top_left_crn,
+                              const Process& process_info)
+{
+}
+

src/cairo_elements.hh

@@ -0,0 +1,78 @@
+// src/cairo_elements.hh - Copyright 2005, 2006, University
+//               of Padova, dept. of Pure and Applied
+//               Mathematics
+//
+// This file is part of SGPEMv2.
+//
+// This is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// SGPEMv2 is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with SGPEMv2; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+#ifndef CAIRO_ELEMENTS_HH
+#define CAIRO_ELEMENTS_HH 1
+
+#include "config.h"
+
+#include "backend/thread.hh"
+#include "backend/process.hh"
+
+#include <cairo/cairo.h>
+
+namespace sgpem
+{
+
+  struct Point
+  {
+    float x;
+    float y;
+  };
+
+  struct Rectangle
+  {
+    float x0;
+    float y0;
+    float w;
+    float h;
+  };
+
+  struct Color
+  {
+    float r;
+    float g;
+    float b;
+  };
+
+
+  class CairoElements
+  {
+  public:
+    CairoElements(cairo_t* const ctx);
+    
+    void draw_3dsphere(const Point& center, float radius, const Color& cl);
+    void draw_3dcube(const Rectangle& area, const Color& cl);
+    void draw_container(const Rectangle& area);
+    void draw_expandable(const Rectangle& area, bool expanded = false);
+
+    Rectangle draw_thread_status(const Point& top_left_crn, 
+                                 const Thread& thread_info);
+    Rectangle draw_process_status(const Point& top_left_crn,
+                                  const Process& process_info);
+
+  private:
+    cairo_t*  _ctx;
+  };
+
+} //~ namespace sgpem
+
+
+#endif //~ CAIRO_ELEMENTS_HH

src/schedulables_widget.cc

@@ -18,6 +18,7 @@
 // along with SGPEMv2; if not, write to the Free Software
 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
+#include "cairo_elements.hh"
 #include "schedulables_widget.hh"
 
 #include <cmath>
@@ -26,7 +27,7 @@ using namespace sgpem;
 
 
 SchedulablesWidget::SchedulablesWidget()
-  : _ctx(NULL)
+  : Gtk::DrawingArea(), _ctx(NULL)
 {
   // Add other events we want to manage (as mouse clicks)
   // when needed
@@ -36,13 +37,29 @@ SchedulablesWidget::SchedulablesWidget()
 
 SchedulablesWidget::~SchedulablesWidget()
 {
+  if(_ctx != NULL)
+    cairo_destroy(_ctx);
 }
 
 
 void 
 SchedulablesWidget::update(const History& history)
 {
-  // FIXME : write me
+  // FIXME : write me using double buffering
+  // GdkPixmap* buffer = gdk_pixmap_new(...);
+  // _ctx = gdk_cairo_create(buffer);
+
+  // do the drawing...
+
+
+  // NOTE: just to try
+  CairoElements ce(_ctx);
+  Color red = { 1, 0, 0 };
+  Point center = { 25, 25 };
+
+  ce.draw_3dsphere(center, 25, red);
+
+  // manually force an expose_event?  
 }
 
  
@@ -60,7 +77,6 @@ bool
 SchedulablesWidget::on_expose_event(GdkEventExpose* event)
 {
   // Use double buffering or we're CPU-dead
-
   Glib::RefPtr<Gdk::Window> window = get_window();
   GdkWindow* gdkWindow = window->gobj();
   GdkDrawable* gdkDrawable;
@@ -71,14 +87,16 @@ SchedulablesWidget::on_expose_event(GdkEventExpose* event)
   // we should use something like create_similar to instantiate a 
   // compatible surface and then copy the buffer to fg
   // So the following two lines WILL HAVE TO CHANGE.
-  cairo_t*& cr = _ctx;
+  if(_ctx == NULL)
-  cr = gdk_cairo_create(gdkDrawable); 
+    _ctx = gdk_cairo_create(gdkDrawable);
+
+  cairo_t* cr = gdk_cairo_create(gdkDrawable); 
   
   const Gtk::Allocation& allocation = get_allocation();
   int width  = allocation.get_width();
   int height = allocation.get_height();
   
-  // Already clip, so that paint hasn't to care about it:
+  // Clip to redraw only the smallest possible area
   if(event) 
     {
       cairo_rectangle(cr, event->area.x, event->area.y,
@@ -86,35 +104,17 @@ SchedulablesWidget::on_expose_event(GdkEventExpose* event)
       cairo_clip(cr);
     }
 
-  // NOTE: just to try:
-  
   // should be calculated dinamically:
   set_size_request(200,400);
   
+  // Copy from buffer to video
+  // if(_ctx != NULL)
+  //   gdk_draw_drawable(buffer, GC??, gdkDrawable, ...clip-region...);
+
   // Height should be calculated dynamically?
   cairo_scale(cr, width, width);
-  cairo_set_line_width(cr, 0.02);
-  cairo_set_source_rgba(cr, 0, 0, 0, 1);
-  
-  // Draw initial sphere perimeter
-  float r = 1.f, g = 0.f, b = 0.f;
-  double x = .5, y = .5, radius = .5;
-  cairo_save(cr);
-  cairo_new_path(cr);
-  cairo_arc(cr, x, y, radius, 0, 2*M_PI);
-  cairo_pattern_t* grad = cairo_pattern_create_radial(x, y, radius, x, y, radius - .15);
-  cairo_pattern_add_color_stop_rgba(grad,  0, r - .2, g - .2, b - .2, 1);
-  cairo_pattern_add_color_stop_rgba(grad,  1,      r,      g,      b, 1);
-  cairo_set_source(cr, grad);
-  cairo_fill_preserve(cr);
-  cairo_pattern_destroy(grad);
-  cairo_set_source_rgba(cr, 0, 0, 0, 1);
-  cairo_set_line_width(cr, radius * .01);
-  cairo_stroke(cr);
-  cairo_restore(cr);	
 
   cairo_destroy(cr);
-  
   return true; 
 }