directfb显示中文

原文：http://www.cnblogs.com/cornsea/archive/2009/09/15/1567365.html

  1. 编译directfb软件栈

     需要的软件包:
       zlib_1.2.3.3.dfsg.orig.tar.gz, libpng-1.2.38.tar.bz2 , jpegsrc.v7.tar.gz,
      freetype_2.3.7.orig.tar.gz,  directfb_1.2.8.orig.tar.gz
     (1) zlib 编译:
                 tar zxvf ../src/zlib_1.2.3.3.dfsg.orig.tar.gz
                 cd zlib-1.2.3.3.dfsg
                 CC=arm-none-linux-gnueabi-gcc ./configure --prefix=/opt
                 make && make install
                 cd .. && rm -rf zlib*
     (2) libpng  编译:

tar jxvf ../src/libpng-1.2.38.tar.bz2
cd libpng-1.2.38/
PKG_CONFIG_PATH=/opt/lib/ pkgconfig CC=arm-none-linux-gnueabi-gcc CFLAGS=-I/opt/include  \
LDFLAGS=-L/opt/lib ./configure --host=arm-none-linux-gnueabi --prefix=/opt --with-gnu-ld
make && make install
cd .. && rm -rf libpng*

     (3) libjpeg 编译:
                  tar zxvf ../src/jpegsrc.v7.tar.gz
                 cd jpeg-7/
                 CC=arm-none-linux-gnueabi-gcc ./configure --host=arm-none-linux-gnueabi \
                 --prefix=/opt --with-gnu-ld
                make && make install
                 cd .. && rm -rf jpeg*
       (4) freetype 编译:
             tar zxvf ../src/freetype_2.3.7.orig.

tar.gz
             cd freetype-2.3.7/
             PKG_CONFIG_PATH=/opt/lib/ pkgconfig CC=arm-none-linux-gnueabi-gcc \
             CFLAGS=-I/opt/include LDFLAGS=-L/opt/lib ./configure --host=arm-none-linux-gnueabi  \
             --prefix=/opt --with-gnu-ld
            make && make install
             cd .. && rm -rf freetype*
        (5) directfb 编译:

tar zxvf ../src/directfb_1.2.8.orig. tar.gz
cd directfb-1.2.8
CPPFLAGS="-I/opt/include" CFLAGS="-I/opt/include" LDFLAGS="-L/opt/lib" \
PKG_CONFIG_PATH="/opt/lib/ pkgconfig" CC=arm-none-linux-gnueabi-gcc \
./configure --host=arm-none-linux-gnueabi --prefix=/opt --exec-prefix=/opt --enable-zlib --disable-x11  \
--enable-fbdev --disable-sdl --disable-vnc --enable-jpeg --disable-gif \
--enable-text --enable-freetype --enable-text --disable-network --disable-debug-support \
--disable-video4linux --with-gnu-ld
make && make install
cd .. && rm -rf directfb*

 2. 配置根文件系统
     (1) 复制库文件(可根据需要选择，比如帮助文件之类的可以不要, 还可以strip，减少库的占用空间) 
          cp -avrf /opt/*  /mnt/armfs/opt/
     (2) 复制字体文件
          cp -avf /usr/share/fonts/truetype/wqy/ wqy-zenhei.ttc  /mnt/armfs/opt/share/directfb- 1.2.8/
 3. 编译可应用程序 (参考directfb的文本显示例子)
     程序代码(我用的是linux系统， 所以源代码中输入的中文应该是utf8的)：
/**
 * text.c
 *
 * Drawing text
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <directfb.h>

/*
 * (Globals)
 */
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 );                         \
      }                                                         \
  }

/*
 * The font we will use to draw the text.
 */
static IDirectFBFont *font = NULL;

/*
 * The string we will draw. Strings in DirectFB have to UTF-8 encoded.
 * For ASCII characters this does not make any difference.
 */
static char *text = "DirectFB rulez!我是中国人";
#define DATADIR "/opt/share/directfb-1.2.8"
int main (int argc, char **argv)
{
  int i, width;

  /*
   * A structure describing font properties.
   */
  DFBFontDescription font_dsc;

  /*
   * (Locals)
   */
  DFBSurfaceDescription dsc;

  /*
   * (Initialize)
   */
  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));

  /*
   * First we need to create a font interface by passing a filename
   * and a font description to specify the desired font size. DirectFB will
   * find (or not) a suitable font loader.
   */
  font_dsc.flags = DFDESC_HEIGHT;
  font_dsc.height = 48;
  DFBCHECK (dfb->CreateFont (dfb, DATADIR"/wqy-zenhei.ttc", &font_dsc, &font));
 
  /*
   * Set the font to the surface we want to draw to.
   */
  DFBCHECK (primary->SetFont (primary, font));
 
  /*
   * Determine the size of our string when drawn using the loaded font.
   * Since we are interested in the full string, we pass -1 as string length.
   */
  DFBCHECK (font->GetStringWidth (font, text, -1, &width));

  /*
   * We want to let the text slide in on the right and slide out on the left.
   */
  for (i = screen_width; i > -width; i--)
    {
      /*
       * Clear the screen.     
       */
      DFBCHECK (primary->SetColor (primary, 0x0, 0x0, 0x0, 0xFF));
      DFBCHECK (primary->FillRectangle (primary, 0, 0, screen_width, screen_height));

      /*
       * Set the color that will be used to draw the text.
       */
      DFBCHECK (primary->SetColor (primary, 0x80, 0x0, 0x20, 0xFF));

      /*
       * Draw the text left aligned with "i" as the X coordinate.
       */
      DFBCHECK (primary->DrawString (primary, text, -1, i, screen_height / 2, DSTF_LEFT));

      /*
       * Flip the front and back buffer, but wait for the vertical retrace to avoid tearing.
       */
      DFBCHECK (primary->Flip (primary, NULL, DSFLIP_WAITFORSYNC));
    }

  /*
   * Release the font.
   */
  font->Release (font);

  /*
   * (Release)
   */
  primary->Release (primary);
  dfb->Release (dfb);
 
  return 23;
}