How to get started with DirectFB. - Revision history

Searchworks: remove spam

2010-11-23T23:25:42Z

remove spam

Aqisecoxefi at 22:44, 23 November 2010

2010-11-23T22:44:34Z

Searchworks: correct hello world tutorial

2009-11-12T04:37:03Z

correct hello world tutorial

Embeddedmicro at 22:48, 3 January 2009

2009-01-03T22:48:47Z

Embeddedmicro at 22:47, 3 January 2009

2009-01-03T22:47:09Z

Embeddedmicro: New page: First, what is DirectFB? According to [http://directfb.org http://directfb.org]: DirectFB is a thin library that provides hardware graphics acceleration, input device handling and abstrac...

2009-01-03T22:46:37Z

New page: First, what is DirectFB? According to [http://directfb.org http://directfb.org]: DirectFB is a thin library that provides hardware graphics acceleration, input device handling and abstrac...

New page

First, what is DirectFB? According to [http://directfb.org http://directfb.org]:

DirectFB is a thin library that provides hardware graphics acceleration, input device handling and abstraction, integrated windowing system with support for translucent windows and multiple display layers, not only on top of the Linux Framebuffer Device. It is a complete hardware abstraction layer with software fallbacks for every graphics operation that is not supported by the underlying hardware. DirectFB adds graphical power to embedded systems and sets a new standard for graphics under Linux.

To write programs that use DirectFB you first have to have it installed. You can either use an image that contains it (gumstix-directfb-image) or you can install it with [code]ipkg install directfb[/code].

After that is installed you will be ready to make your first program. You should have already done the [http://www.gumstix.net/Software/view/Build-system-overview/Hello-world-tutorial/111.html hello world] tutorial. Make a folder in user.collection/packages called dfb. Then make your dfb_1.0.0.bb file and fill it with this.
DESCRIPTION = "a directfb sample"
DEPENDS = "directfb"
SECTION = "libs"
LICENSE = "GPL"

PR = "r0"

SRC_URI = " \
file://dfb.c \
"

S = "${WORKDIR}"

CFLAGS += "-I/${STAGING_INCDIR}/directfb"

LDFLAGS += "-ldirectfb"

do_compile () {
${CC} ${CFLAGS} ${LDFLAGS} -o dfb dfb.c
}

do_install () {
install -d ${D}${bindir}/
install -m 0755 ${S}/dfb ${D}${bindir}/
}

FILES_${PN} = "${bindir}/dfb"
Next make a folder called files and make a file called dfb.c in it. dfb.c should contain
#include <stdio.h>
#include <unistd.h>
#include <directfb.h>

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 = 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, 0x80, 0x80, 0xff, 0xff));
DFBCHECK (primary->DrawLine (primary,
0, screen_height / 2,
screen_width - 1, screen_height / 2));
DFBCHECK (primary->Flip (primary, NULL, 0));

sleep (5);

primary->Release( primary );
dfb->Release( dfb );

return 23;
}

You should now be ready to compile with
bitbake dfb
then you can install it following the same method in the hello world tutorial.

@@ Line 1: / Line 1: @@
 First, what is DirectFB? According to [http://directfb.org http://directfb.org]:
@@ Line 8: / Line 7: @@
 After that is installed you will be ready to make your first program. You should have already done the [http://www.gumstix.net/User-How-To-s/view/Build-system-overview/Hello-world-tutorial/110.html hello world] tutorial. Make a folder in user.collection/packages called dfb. Then make your dfb_1.0.0.bb file and fill it with this.
-  DESCRIPTION = &quot;a directfb sample&quot;
+  DESCRIPTION = "a directfb sample"
-  DEPENDS = &quot;directfb&quot;
+  DEPENDS = "directfb"
-  SECTION = &quot;libs&quot;
+  SECTION = "libs"
-  LICENSE = &quot;GPL&quot;
+  LICENSE = "GPL"
-  PR = &quot;r0&quot;
+  PR = "r0"
-  SRC_URI = &quot; \
+  SRC_URI = " \
    file://dfb.c \
-  &quot;
-  S = &quot;${WORKDIR}&quot;
+  S = "${WORKDIR}"
-  CFLAGS += &quot;-I/${STAGING_INCDIR}/directfb&quot;
+  CFLAGS += "-I/${STAGING_INCDIR}/directfb"
-  LDFLAGS += &quot;-ldirectfb&quot;
+  LDFLAGS += "-ldirectfb"
   do_compile () {
@@ Line 34: / Line 33: @@
+  }
-  FILES_${PN} = &quot;${bindir}/dfb&quot;
+  FILES_${PN} = "${bindir}/dfb"
 Next make a folder called files and make a file called dfb.c in it. dfb.c should contain
-  #include &lt;stdio.h&gt;
+  #include <stdio.h>
-  #include &lt;unistd.h&gt;
+  #include <unistd.h>
-  #include &lt;directfb.h&gt;
+  #include <directfb.h>
   static IDirectFB *dfb = NULL;
@@ Line 51: / Line 50: @@
       if (err != DFB_OK)                                         \
         {                                                        \
-          fprintf( stderr, &quot;%s &lt;%d&gt;:\n\t&quot;, __FILE__, __LINE__ ); \
+          fprintf( stderr, "%s <%d>:\n\t", __FILE__, __LINE__ ); \
           DirectFBErrorFatal( #x, err );                         \
         }                                                        \
@@ Line 60: / Line 59: @@
     DFBSurfaceDescription dsc;
-    DFBCHECK (DirectFBInit (&amp;argc, &amp;argv));
+    DFBCHECK (DirectFBInit (&argc, &argv));
-    DFBCHECK (DirectFBCreate (&amp;dfb));
+    DFBCHECK (DirectFBCreate (&dfb));
-    DFBCHECK (dfb-&gt;SetCooperativeLevel (dfb, DFSCL_FULLSCREEN));
+    DFBCHECK (dfb->SetCooperativeLevel (dfb, DFSCL_FULLSCREEN));
     dsc.flags = DSDESC_CAPS;
     dsc.caps  = DSCAPS_PRIMARY | DSCAPS_FLIPPING;
-    DFBCHECK (dfb-&gt;CreateSurface( dfb, &amp;dsc, &amp;primary ));
+    DFBCHECK (dfb->CreateSurface( dfb, &dsc, &primary ));
-    DFBCHECK (primary-&gt;GetSize (primary, &amp;screen_width, &amp;screen_height));
+    DFBCHECK (primary->GetSize (primary, &screen_width, &screen_height));
-    DFBCHECK (primary-&gt;FillRectangle (primary, 0, 0, screen_width, screen_height));
+    DFBCHECK (primary->FillRectangle (primary, 0, 0, screen_width, screen_height));
-    DFBCHECK (primary-&gt;SetColor (primary, 0x80, 0x80, 0xff, 0xff));
+    DFBCHECK (primary->SetColor (primary, 0x80, 0x80, 0xff, 0xff));
-    DFBCHECK (primary-&gt;DrawLine (primary,
+    DFBCHECK (primary->DrawLine (primary,
 , screen_height / 2,
   			       screen_width - 1, screen_height / 2));
-    DFBCHECK (primary-&gt;Flip (primary, NULL, 0));
+    DFBCHECK (primary->Flip (primary, NULL, 0));
     sleep (5);
-    primary-&gt;Release( primary );
+    primary->Release( primary );
-    dfb-&gt;Release( dfb );
+    dfb->Release( dfb );
     return 23;

@@ Line 83: / Line 83: @@
     return 23;
+  }
 You should now be ready to compile with
   bitbake dfb
 then you can install it following the same method in the hello world tutorial.

@@ Line 3: / Line 3: @@
 DirectFB is a thin library that provides hardware graphics acceleration, input device handling and abstraction, integrated windowing system with support for translucent windows and multiple display layers, not only on top of the Linux Framebuffer Device. It is a complete hardware abstraction layer with software fallbacks for every graphics operation that is not supported by the underlying hardware. DirectFB adds graphical power to embedded systems and sets a new standard for graphics under Linux.
-To write programs that use DirectFB you first have to have it installed. You can either use an image that contains it (gumstix-directfb-image) or you can install it with [code]ipkg install directfb[/code].
+To write programs that use DirectFB you first have to have it installed. You can either use an image that contains it (gumstix-directfb-image) or you can install it with
 After that is installed you will be ready to make your first program. You should have already done the [http://www.gumstix.net/Software/view/Build-system-overview/Hello-world-tutorial/111.html hello world] tutorial. Make a folder in user.collection/packages called dfb. Then make your dfb_1.0.0.bb file and fill it with this.