Hi,
I have a problem creating a function that will draw the contents of a buffer
into a drawing area.
Here is the function I call when I want to draw the contents of "buffer" into
the drawingarea designated by "area":
int draw_in_widget(GtkWidget *area,unsigned char* buffer,int img_height,int
img_width,bool is_rgb)
{
//conversion BGR->RGB
if(!is_rgb)
{
unsigned char tmp;
for(int i=0;i<img_width*img_height;i++)
{
tmp = buffer[3*i];//B->tmp
buffer[3*i] = buffer[3*i+2];//R->B
buffer[3*i+2] = tmp;//tmp->R
}
}
gpointer destroy_fn_data;
int area_width=area->allocation.width;
int area_height=area->allocation.height;
GdkPixbuf *pixbuf_dest=gdk_pixbuf_new(GDK_COLORSPACE_RGB,FALSE,8,
area_width,area_height);
GdkPixbuf
*pixbuf_src=gdk_pixbuf_new_from_data(buffer,GDK_COLORSPACE_RGB,FALSE,8,
img_width,img_height,img_width*3,NULL,destroy_fn_data);
GdkGC *gc=area->style->fg_gc[GTK_STATE_NORMAL];
double scale_x=(double)area_width/img_width;
double scale_y=(double)area_height/img_height;
gtk_widget_queue_draw(area);
gdk_pixbuf_scale(pixbuf_src,pixbuf_dest,0,0,area_width,area_height,
0,0,scale_x,scale_y,GDK_INTERP_TILES);
gdk_draw_pixbuf(area->window,gc,pixbuf_dest,
0,0,0,0,area_width,area_height,GDK_RGB_DITHER_NORMAL,0,0);
gdk_pixbuf_unref(pixbuf_src);
gdk_pixbuf_unref(pixbuf_dest);
return(0);
}
The function adapts the size of the image contained in the buffer (of size
3*img_height*img_width) to the size of the drawing area.
My problem is that this function only works when placed in a
"on_drawingarea1_expose_event" handler.
If I place it somewhere else in my code, the image will only be drawn
immediately if there is no "pause" after my draw_in_widget function.
And I don't know how to call the "on_drawingarea1_expose_event" handler, since
I have no idea what arguments to give him.
The arguments asked by the handler are:
-GtkWidget *widget,
-GdkEventExpose *event,
-gpointer user_data
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