- Start working on double-buffering on cairo widgets. The system

will SIGSEGV. I will fix this asap, in the meantime use the cmdline
interface.


git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@810 3ecf2c5c-341e-0410-92b4-d18e462d057c
This commit is contained in:
tchernobog 2006-08-02 13:48:26 +00:00
parent 6969d5b2c2
commit 5b577c5979
3 changed files with 70 additions and 43 deletions

View File

@ -24,6 +24,9 @@
#include "schedulables_widget.hh"
#include "gui_builder.hh"
#include "backend/history.hh"
#include "backend/simulation.hh"
#include <glibmm/ustring.h>
#include <gtkmm/aboutdialog.h>
#include <gtkmm/expander.h>
@ -64,6 +67,10 @@ GuiBuilder::GuiBuilder(const std::string& gladefile)
scheds_expander->add(*scheds_widget);
// we have to remember to manually show custom added widgets:
scheds_widget->show();
// A test for widget display:
Simulation& sim = Simulation::get_instance();
sim.get_history().add_process("goofy", 0, 0);
}

View File

@ -21,45 +21,72 @@
#include "cairo_elements.hh"
#include "schedulables_widget.hh"
#include <cmath>
#include "backend/history.hh"
#include "backend/simulation.hh"
#include <iostream>
#include <memory>
using namespace sgpem;
SchedulablesWidget::SchedulablesWidget()
: Gtk::DrawingArea(), _ctx(NULL)
: Gtk::DrawingArea(), _h(1), _buf(NULL)
{
// Add other events we want to manage (as mouse clicks)
// when needed
add_events(Gdk::EXPOSURE_MASK);
// Register this observer:
Simulation::get_instance().get_history().attach(*this);
}
SchedulablesWidget::~SchedulablesWidget()
{
if(_ctx != NULL)
cairo_destroy(_ctx);
Simulation::get_instance().get_history().detach(*this);
}
void
SchedulablesWidget::update(const History& history)
{
// Determine the final height before to start drawing
unsigned int w = get_allocation().get_width();
_h = calc_height(history);
// FIXME : write me using double buffering
// GdkPixmap* buffer = gdk_pixmap_new(...);
// _ctx = gdk_cairo_create(buffer);
// PROBLEM : get_window() seems to return a null pointer!!!
_buf = Gdk::Pixmap::create(get_window(), w, _h);
cairo_t* ctx = gdk_cairo_create(_buf->gobj());
// do the drawing...
draw_widget(ctx);
cairo_scale(ctx, w, _h);
// manually force an expose_event?
cairo_destroy(ctx);
}
void
SchedulablesWidget::draw_widget(cairo_t* ctx)
{
// NOTE: just to try
CairoElements ce(_ctx);
CairoElements ce(ctx);
Color red = { 1, 0, 0 };
Point center = { 25, 25 };
ce.draw_3dsphere(center, 25, red);
}
// manually force an expose_event?
unsigned int
SchedulablesWidget::calc_height(const History& history) const
{
// FIXME: write me
return 400;
}
@ -69,52 +96,37 @@ SchedulablesWidget::on_size_request(Gtk::Requisition* requisition)
// FIXME: take correct measures, consider also using a viewport(?)
*requisition = Gtk::Requisition();
requisition->width = get_allocation().get_width();
requisition->height = requisition->width;
requisition->height = _h;
}
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;
gint xOffset, yOffset;
gdk_window_get_internal_paint_info(gdkWindow, &gdkDrawable, &xOffset, &yOffset);
// Copy new ctx from old one (the buffer); from distant memories,
// 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.
if(_ctx == NULL)
_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();
// Clip to redraw only the smallest possible area
if(event)
{
cairo_rectangle(cr, event->area.x, event->area.y,
event->area.width, event->area.height);
cairo_clip(cr);
}
// should be calculated dinamically:
set_size_request(200,400);
std::auto_ptr<Gdk::Rectangle> clip_area;
if(event)
clip_area = std::auto_ptr<Gdk::Rectangle>(new Gdk::Rectangle(event->area.x, event->area.y,
event->area.width, event->area.height));
// Copy from buffer to video
// if(_ctx != NULL)
// gdk_draw_drawable(buffer, GC??, gdkDrawable, ...clip-region...);
else
clip_area = std::auto_ptr<Gdk::Rectangle>(new Gdk::Rectangle(0, 0, width, height));
// Height should be calculated dynamically?
cairo_scale(cr, width, width);
cairo_destroy(cr);
// Use double buffering or we're CPU-dead
// Copy from the buffer to the screen
if(_buf)
get_window()->draw_drawable(Gdk::GC::create(get_window()), _buf,
clip_area->get_x(), clip_area->get_y(),
clip_area->get_x(), clip_area->get_y(),
clip_area->get_width(), clip_area->get_height());
// calculated dinamically:
set_size_request(width, _h);
return true;
}

View File

@ -25,7 +25,9 @@
#include "backend/history_observer.hh"
#include <cairo/cairo.h>
#include <gtkmm/drawingarea.h>
#include <gdkmm/pixmap.h>
namespace sgpem
{
@ -41,6 +43,12 @@ namespace sgpem
virtual void on_size_request(Gtk::Requisition* requisition);
virtual bool on_expose_event(GdkEventExpose* event);
virtual bool on_button_press_event(GdkEventButton* event);
virtual void draw_widget(cairo_t* ctx);
virtual unsigned int calc_height(const History& history) const;
// The height the widget will assume, must be determined
// before starting drawing by calc_height().
unsigned int _h;
private:
typedef Gdk::Rectangle area_t;
@ -48,7 +56,7 @@ namespace sgpem
typedef std::pair<area_t, method0_t> area_callback_t;
typedef std::vector<area_callback_t> areas_vect_t;
cairo_t* _ctx;
Glib::RefPtr<Gdk::Pixmap> _buf;
};
} //~ namespace sgpem