libs/gtkutil/xorrectangle.cpp

   1 #include "xorrectangle.h"
   2
   3 #include <gtk/gtk.h>
   4
   5 #include "gtkutil/glwidget.h"
   6 #include "igl.h"
   7
   8 #include <gtk/gtkglwidget.h>
   9
  10 //#include "stream/stringstream.h"
  11
  12 bool XORRectangle::initialised() const
  13 {
  14     return !!cr;
  15 }
  16
  17 void XORRectangle::lazy_init()
  18 {
  19     if (!initialised()) {
  20         cr = gdk_cairo_create(gtk_widget_get_window(m_widget));
  21     }
  22 }
  23
  24 void XORRectangle::draw() const
  25 {
  26 #ifndef WORKAROUND_MACOS_GTK2_DESTROY
  27     const int x = float_to_integer(m_rectangle.x);
  28     const int y = float_to_integer(m_rectangle.y);
  29     const int w = float_to_integer(m_rectangle.w);
  30     const int h = float_to_integer(m_rectangle.h);
  31     GtkAllocation allocation;
  32     gtk_widget_get_allocation(m_widget, &allocation);
  33     cairo_rectangle(cr, x, -(h) - (y - allocation.height), w, h);
  34     cairo_set_source_rgb(cr, 1, 1, 1);
  35     cairo_set_operator(cr, CAIRO_OPERATOR_DIFFERENCE);
  36     cairo_stroke(cr);
  37 #endif
  38 }
  39
  40 XORRectangle::XORRectangle(ui::GLArea widget) : m_widget(widget), cr(0)
  41 {
  42 }
  43
  44 XORRectangle::~XORRectangle()
  45 {
  46     if (initialised()) {
  47 #ifndef WORKAROUND_MACOS_GTK2_DESTROY
  48         cairo_destroy(cr);
  49 #endif
  50     }
  51 }
  52
  53 void XORRectangle::set(rectangle_t rectangle)
  54 {
  55     if (gtk_widget_get_realized(m_widget)) {
  56                 if( m_rectangle.w != rectangle.w || m_rectangle.h != rectangle.h ){
  57                 //if( !(m_rectangle.w == 0 && m_rectangle.h == 0 && rectangle.w == 0 && rectangle.h == 0) ){
  58                 //globalOutputStream() << "m_x" << m_rectangle.x << " m_y" << m_rectangle.y << " m_w" << m_rectangle.w << " m_h" << m_rectangle.h << "\n";
  59                 //globalOutputStream() << "__x" << rectangle.x << " __y" << rectangle.y << " __w" << rectangle.w << " __h" << rectangle.h << "\n";
  60                         if ( glwidget_make_current( m_widget ) != FALSE ) {
  61                                 GlobalOpenGL_debugAssertNoErrors();
  62
  63                                 gint width, height;
  64                                 gdk_gl_drawable_get_size( gtk_widget_get_gl_drawable( m_widget ), &width, &height );
  65
  66                                 glViewport( 0, 0, width, height );
  67                                 glMatrixMode( GL_PROJECTION );
  68                                 glLoadIdentity();
  69                                 glOrtho( 0, width, 0, height, -100, 100 );
  70                                 glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
  71                                 glDisable( GL_DEPTH_TEST );
  72
  73                                 glDrawBuffer( GL_FRONT );
  74
  75                                 glEnable( GL_BLEND );
  76                                 glBlendFunc( GL_ONE_MINUS_DST_COLOR, GL_ZERO );
  77
  78                                 glLineWidth( 2 );
  79                                 glColor3f( 1, 1, 1 );
  80                                 glDisable( GL_TEXTURE_2D );
  81                                 glBegin( GL_LINE_LOOP );
  82                                 glVertex2f( m_rectangle.x, m_rectangle.y + m_rectangle.h );
  83                                 glVertex2f( m_rectangle.x + m_rectangle.w, m_rectangle.y + m_rectangle.h );
  84                                 glVertex2f( m_rectangle.x + m_rectangle.w, m_rectangle.y );
  85                                 glVertex2f( m_rectangle.x, m_rectangle.y );
  86                                 glEnd();
  87
  88                                 glBegin( GL_LINE_LOOP );
  89                                 glVertex2f( rectangle.x, rectangle.y + rectangle.h );
  90                                 glVertex2f( rectangle.x + rectangle.w, rectangle.y + rectangle.h );
  91                                 glVertex2f( rectangle.x + rectangle.w, rectangle.y );
  92                                 glVertex2f( rectangle.x, rectangle.y );
  93                                 glEnd();
  94
  95                                 glDrawBuffer( GL_BACK );
  96                                 GlobalOpenGL_debugAssertNoErrors();
  97                                 //glwidget_swap_buffers( m_widget );
  98                                 glwidget_make_current( m_widget );
  99                         }
 100                 }
 101                 m_rectangle = rectangle;
 102     }
 103 }