libs/gtkutil/xorrectangle.cpp

   1 #include "xorrectangle.h"
   2
   3 #include <gtk/gtk.h>
   4
   5 #define GARUX_DISABLE_BAD_XORRECTANGLE
   6
   7 #if !defined(GARUX_DISABLE_BAD_XORRECTANGLE) && GTK_TARGET == 2
   8 #include "gtkutil/glwidget.h"
   9 #include "igl.h"
  10
  11 #include <gtk/gtkglwidget.h>
  12 #endif // !GARUX_DISABLE_BAD_XORRECTANGLE && GTK_TARGET == 2
  13
  14 //#include "stream/stringstream.h"
  15
  16 bool XORRectangle::initialised() const
  17 {
  18     return !!cr;
  19 }
  20
  21 void XORRectangle::lazy_init()
  22 {
  23     if (!initialised()) {
  24         cr = gdk_cairo_create(gtk_widget_get_window(m_widget));
  25     }
  26 }
  27
  28 void XORRectangle::draw() const
  29 {
  30 #ifndef WORKAROUND_MACOS_GTK2_DESTROY
  31     const int x = float_to_integer(m_rectangle.x);
  32     const int y = float_to_integer(m_rectangle.y);
  33     const int w = float_to_integer(m_rectangle.w);
  34     const int h = float_to_integer(m_rectangle.h);
  35     GtkAllocation allocation;
  36     gtk_widget_get_allocation(m_widget, &allocation);
  37     cairo_rectangle(cr, x, -(h) - (y - allocation.height), w, h);
  38     cairo_set_source_rgb(cr, 1, 1, 1);
  39     cairo_set_operator(cr, CAIRO_OPERATOR_DIFFERENCE);
  40     cairo_stroke(cr);
  41 #endif
  42 }
  43
  44 XORRectangle::XORRectangle(ui::GLArea widget) : m_widget(widget), cr(0)
  45 {
  46 }
  47
  48 XORRectangle::~XORRectangle()
  49 {
  50     if (initialised()) {
  51 #ifndef WORKAROUND_MACOS_GTK2_DESTROY
  52         cairo_destroy(cr);
  53 #endif
  54     }
  55 }
  56
  57 void XORRectangle::set(rectangle_t rectangle)
  58 {
  59     if (gtk_widget_get_realized(m_widget)) {
  60 #if !defined(GARUX_DISABLE_BAD_XORRECTANGLE) && GTK_TARGET == 2
  61                 if( m_rectangle.w != rectangle.w || m_rectangle.h != rectangle.h ){
  62                 //if( !(m_rectangle.w == 0 && m_rectangle.h == 0 && rectangle.w == 0 && rectangle.h == 0) ){
  63                 //globalOutputStream() << "m_x" << m_rectangle.x << " m_y" << m_rectangle.y << " m_w" << m_rectangle.w << " m_h" << m_rectangle.h << "\n";
  64                 //globalOutputStream() << "__x" << rectangle.x << " __y" << rectangle.y << " __w" << rectangle.w << " __h" << rectangle.h << "\n";
  65                         if ( glwidget_make_current( m_widget ) != FALSE ) {
  66                                 GlobalOpenGL_debugAssertNoErrors();
  67
  68                                 gint width, height;
  69                                 gdk_gl_drawable_get_size( gtk_widget_get_gl_drawable( m_widget ), &width, &height );
  70
  71                                 glViewport( 0, 0, width, height );
  72                                 glMatrixMode( GL_PROJECTION );
  73                                 glLoadIdentity();
  74                                 glOrtho( 0, width, 0, height, -100, 100 );
  75
  76                                 glMatrixMode( GL_MODELVIEW );
  77                                 glLoadIdentity();
  78
  79                                 glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
  80                                 glDisable( GL_DEPTH_TEST );
  81
  82                                 glDrawBuffer( GL_FRONT );
  83
  84                                 glEnable( GL_BLEND );
  85                                 glBlendFunc( GL_ONE_MINUS_DST_COLOR, GL_ZERO );
  86
  87                                 glLineWidth( 2 );
  88                                 glColor3f( 1, 1, 1 );
  89                                 glDisable( GL_TEXTURE_2D );
  90                                 glBegin( GL_LINE_LOOP );
  91                                 glVertex2f( m_rectangle.x, m_rectangle.y + m_rectangle.h );
  92                                 glVertex2f( m_rectangle.x + m_rectangle.w, m_rectangle.y + m_rectangle.h );
  93                                 glVertex2f( m_rectangle.x + m_rectangle.w, m_rectangle.y );
  94                                 glVertex2f( m_rectangle.x, m_rectangle.y );
  95                                 glEnd();
  96
  97                                 glBegin( GL_LINE_LOOP );
  98                                 glVertex2f( rectangle.x, rectangle.y + rectangle.h );
  99                                 glVertex2f( rectangle.x + rectangle.w, rectangle.y + rectangle.h );
 100                                 glVertex2f( rectangle.x + rectangle.w, rectangle.y );
 101                                 glVertex2f( rectangle.x, rectangle.y );
 102                                 glEnd();
 103
 104                                 glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
 105                                 glDrawBuffer( GL_BACK );
 106                                 GlobalOpenGL_debugAssertNoErrors();
 107                                 //glwidget_swap_buffers( m_widget );
 108                                 glwidget_make_current( m_widget );
 109                         }
 110                 }
 111                 m_rectangle = rectangle;
 112 #else // GARUX_DISABLE_BAD_XORRECTANGLE || GTK_TARGET != 2
 113                 lazy_init();
 114                 draw();
 115                 m_rectangle = rectangle;
 116                 draw();
 117 #endif // !GARUX_DISABLE_BAD_XORRECTANGLE && GTK_TARGET == 2
 118     }
 119 }