问题
This same example runs with no problem in my older Ubuntu 10.10 with DirectFB 1.4.11 and shows a yellow line in the center of the black screen:
#include <iostream>
#include <stdio.h>
#include <unistd.h>
#include <directfb.h>
using namespace std;
static IDirectFB *dfb = NULL;
static IDirectFBSurface *primary = NULL;
static int screen_width = 0;
static int screen_height = 0;
#define DFBCHECK(x...) \
{ \
DFBResult err = x; \
\
if (err != DFB_OK) \
{ \
fprintf( stderr, "%s <%d>:\n\t", __FILE__, __LINE__ ); \
DirectFBErrorFatal( #x, err ); \
} \
}
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 = DFBSurfaceCapabilities(DSCAPS_PRIMARY | DSCAPS_FLIPPING);
DFBCHECK(dfb->CreateSurface( dfb, &dsc, &primary ));
DFBCHECK(primary->GetSize (primary, &screen_width, &screen_height));
DFBCHECK(primary->FillRectangle (primary, 0, 0, screen_width, screen_height));
DFBCHECK(primary->SetColor (primary, 0xFF, 0xFF, 0x00, 0xff));
DFBCHECK(primary->SetSrcColorKey(primary, 0xFF, 0xFF, 0x00));
DFBCHECK(primary->SetBlittingFlags(primary, (DFBSurfaceBlittingFlags) ( DSBLIT_BLEND_ALPHACHANNEL | DSBLIT_SRC_COLORKEY)));
DFBCHECK(primary->DrawLine (primary, 0, screen_height / 2, screen_width - 1, screen_height / 2));
primary->Flip(primary, NULL, DFBSurfaceFlipFlags(0));
sleep(3);
primary->Release(primary);
dfb->Release(dfb);
cout << "DONE!\n";
return 23;
}
But this same example will only show a black screen, with no line, in Ubuntu 12.04, using DirectFB 6.3.
The console output is:
# ./a.out
~~~~~~~~~~~~~~~~~~~~~~~~~~| DirectFB 1.6.3 |~~~~~~~~~~~~~~~~~~~~~~~~~~
(c) 2012-2013 DirectFB integrated media GmbH
(c) 2001-2013 The world wide DirectFB Open Source Community
(c) 2000-2004 Convergence (integrated media) GmbH
----------------------------------------------------------------
(*) DirectFB/Core: Single Application Core. (2013-02-07 11:05)
(*) Direct/Memcpy: Using libc memcpy()
(*) Direct/Thread: Started 'Fusion Dispatch' (-1) [MESSAGING OTHER/OTHER 0/0] <8388608>...
(*) Direct/Thread: Started 'VT Switcher' (-1) [CRITICAL OTHER/OTHER 0/0] <8388608>...
(*) Direct/Thread: Started 'VT Flusher' (-1) [DEFAULT OTHER/OTHER 0/0] <8388608>...
(*) DirectFB/FBDev: Found 'svgadrmfb' (ID 0) with frame buffer at 0x00000000, 15360k (MMIO 0x00000000, 0k)
(*) Direct/Thread: Started 'PS/2 Input' (-1) [INPUT OTHER/OTHER 0/0] <8388608>...
(*) DirectFB/Input: IMPS/2 Mouse (1) 1.0 (directfb.org)
(*) Direct/Thread: Started 'PS/2 Input' (-1) [INPUT OTHER/OTHER 0/0] <8388608>...
(*) DirectFB/Input: IMPS/2 Mouse (2) 1.0 (directfb.org)
(*) Direct/Thread: Started 'Linux Input' (-1) [INPUT OTHER/OTHER 0/0] <8388608>...
(*) DirectFB/Input: Power Button (1) 0.1 (directfb.org)
(*) Direct/Thread: Started 'Linux Input' (-1) [INPUT OTHER/OTHER 0/0] <8388608>...
(*) DirectFB/Input: AT Translated Set 2 keyboard (2) 0.1 (directfb.org)
(*) Direct/Thread: Started 'Linux Input' (-1) [INPUT OTHER/OTHER 0/0] <8388608>...
(*) DirectFB/Input: VMware VMware Virtual USB Mouse (3) 0.1 (directfb.org)
(*) Direct/Thread: Started 'Linux Input' (-1) [INPUT OTHER/OTHER 0/0] <8388608>...
(*) DirectFB/Input: VMware VMware Virtual USB Mouse (4) 0.1 (directfb.org)
(*) Direct/Thread: Started 'Linux Input' (-1) [INPUT OTHER/OTHER 0/0] <8388608>...
(*) DirectFB/Input: ImPS/2 Generic Wheel Mouse (5) 0.1 (directfb.org)
(*) Direct/Thread: Started 'Hotplug with Linux Input' (-1) [INPUT OTHER/OTHER 0/0] <8388608>...
(*) DirectFB/Input: Hot-plug detection enabled with Linux Input Driver
(*) Direct/Thread: Started 'Joystick Input' (-1) [INPUT OTHER/OTHER 0/0] <8388608>...
(*) DirectFB/Input: Joystick 0.9 (directfb.org)
(*) DirectFB/Input: Hot-plug detection enabled with Input Hub Driver
(*) Direct/Thread: Started 'Keyboard Input' (-1) [INPUT OTHER/OTHER 0/0] <8388608>...
(!!!) *** ONCE [Joystick sends JS_EVENT_INIT events, make sure it has been calibrated using 'jscal -c'
] *** [joystick.c:99 in joystick_handle_event()]
(*) DirectFB/Input: Keyboard 0.9 (directfb.org)
(*) DirectFB/Genefx: MMX detected and enabled
(*) DirectFB/Graphics: MMX Software Rasterizer 0.7 (directfb.org)
(*) DirectFB/Core/WM: Default 0.3 (directfb.org)
(*) FBDev/Mode: Setting 800x600 RGB32
(*) FBDev/Mode: Switched to 800x600 (virtual 800x600) at 32 bit (RGB32), pitch 8192
(*) FBDev/Mode: Setting 800x600 RGB32
(*) FBDev/Mode: Switched to 800x600 (virtual 800x600) at 32 bit (RGB32), pitch 8192
(*) FBDev/Mode: Setting 800x600 RGB32
(*) FBDev/Mode: Switched to 800x600 (virtual 800x1200) at 32 bit (RGB32), pitch 8192
(*) FBDev/Mode: Setting 800x600 RGB32
(*) FBDev/Mode: Switched to 800x600 (virtual 800x600) at 32 bit (RGB32), pitch 8192
DONE!
Any idea why the line is not drawn? I wonder if it's a problem with the 64-bit system?
回答1:
You meant 1.6.3 version. I dont know about your configure options. For example MMX Support.
You can reconfigure and reinstall it with --enable-debug and/or --enable-trace then run the programs with --dfb:debug for more info.
Also DirectFB does a lot of system call while running so you can see them by strace.
This is an old question but lately these are my suggested methods to find related problems to run directfb apps.
Goog luck.
来源：https://stackoverflow.com/questions/14752993/how-to-run-this-dfb-image-example-on-ubuntu-12-04-64-bit-with-directfb-1-6-3