Question

同样的例子在我的旧版Ubuntu 10.10和DirectFB 1.4.11中没有问题，并且在黑屏的中心显示一条黄线：

#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;
}

但是同样的例子只会在Ubuntu 12.04中使用DirectFB 6.3显示黑屏，没有行。

控制台输出是：

# ./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!

知道为什么不画线？我想知道这是64位系统的问题吗？

Answer 1

您的意思是1.6.3。我不知道你的配置选项。例如MMX Support。您可以使用--enable-debug和/或--enable-trace重新配置并重新安装，然后使用--dfb:debug运行程序以获取更多信息。另外DirectFB在运行时会执行大量system call，因此您可以通过strace查看它们。这是一个老问题，但最近这些是我建议的方法来查找运行directfb应用程序的相关问题。 Goog运气好。

如何使用DirectFB 1.6.3在64位Ubuntu 12.04上运行此DFB映像示例？

1 个答案: