cairo and directfb

Alex Vazquez <[email protected]> Fri, 22 May 2015 01:02:20 +0200

Newsgroups	gmane.comp.lib.cairo
Message-ID	<CAOTEMUR6f+=mo05vLVLDb86BKP1EfeDj+iUuA6TQo5CN9bekPQ@mail.gmail.com>

Hi all!
I am using cairo and directFB to create a application.
I have the next problem.
When I want to paint the window with DirectFB, I can not paint if I have
not destroyed before the element cairo_t. My problem is I do not want to
destroy it because I want to modify more times but if I destroy the object
it can not modify more.
If not destroy the object cairo_t I get an error that the resource is
locked.

I do not know if I'm explaining well. I add the code if you can help me.

Thanks!
Regards!
Alex

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test1cairo.c (text/x-csrc, 2 KB)

#include <stdio.h>
#include <stdlib.h>
#include <cairo.h>
#include <directfb.h>
#include <cairo-directfb.h>

static IDirectFB *dfb = NULL;
static IDirectFBSurface *primary = NULL;
static int screen_width  = 0;
static int screen_height = 0;
cairo_surface_t *image;
cairo_t *cr;

#define DFBCHECK(x...)                                         \
  {                                                            \
    DFBResult err = x;                                         \
                                                               \
    if (err != DFB_OK)                                         \
      {                                                        \
        fprintf( stderr, "%s <%d>:\n\t", __FILE__, __LINE__ ); \
        DirectFBErrorFatal( #x, err );                         \
      }                                                        \
  }
static void draw_simple( IDirectFB *dfb,IDirectFBSurface *surface )
{
	cairo_surface_t *csurface=cairo_directfb_surface_create(dfb,surface);
	cr = cairo_create(csurface);
	cairo_surface_destroy(csurface);
        cairo_set_source_rgba (cr, 1, 0, 0, 0.80);
        cairo_rectangle (cr, 0, 0,100, 100);
        cairo_stroke (cr);
}
static void draw_simple_2()
{
    cairo_set_source_rgba (cr, 0, 1, 0, 1);
    cairo_rectangle (cr, 100, 100,100, 100);
    cairo_stroke (cr);

        
}
int main(int argc, char *argv[])
{
	DFBSurfaceDescription dsc;
	DFBCHECK (DirectFBInit (&argc, &argv));
 	DFBCHECK (DirectFBCreate (&dfb));
 	DFBCHECK (dfb->SetCooperativeLevel (dfb, DFSCL_FULLSCREEN));  

        dsc.flags = DSDESC_CAPS;
  	dsc.caps  = DSCAPS_PRIMARY | DSCAPS_FLIPPING | DWCAPS_ALPHACHANNEL;

 	DFBCHECK (dfb->CreateSurface( dfb, &dsc, &primary ));
 	DFBCHECK (primary->GetSize (primary, &screen_width, &screen_height));
	draw_simple(dfb,primary);
        cairo_destroy(cr);
        DFBCHECK (primary->Flip (primary, NULL, 0));
        sleep(5);
        draw_simple_2();
        DFBCHECK (primary->Flip (primary, NULL, 0));
        sleep(5);


        primary->Release(primary);
        dfb->Release( dfb );
  
	return 0;
}

Makefile (application/octet-stream, 383 B) - not displayed