Wanted: framebuffer tool

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(change the framebuffer device to whichever you use)

Compile with c99 -o ftfb ftfb.c `freetype-config --cflags --libs`

If you have an LCD display, you will need to enable FreeType LCD rendering--the default graymaps don't render too nicely, at least for me.

When run, this paints each character in the G0 set. You can alter the font and colours at you please.

Regards, Roger

* ftfb.c - print FreeType rendered glyphs on the Linux Framebuffer * * * ftfb is free software; you can redistribute it and-or modify it * under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * ftfb is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA * *********************************************************************

#include FTFREETYPEH

void fail (const char *reason) { fprintf (stderr, "%s-n", reason); exit (EXITFAILURE); }

int main() { map in the framebuffer int fbfd = 0; struct fbvarscreeninfo vinfo; struct fbfixscreeninfo finfo; long int screensize = 0; char *fbp = 0; int x = 0, y = 0; long int location = 0;

Open the file for reading and writing fbfd = open("-dev-fb-0", ORDWR); if (!fbfd) fail("Error: cannot open framebuffer device.");

Get fixed screen information if (ioctl(fbfd, FBIOGETFSCREENINFO, &finfo)) fail("Error reading fixed information.");

Get variable screen information if (ioctl(fbfd, FBIOGETVSCREENINFO, &vinfo)) fail("Error reading variable information.");

printf("%dx%d, %dbpp-n", vinfo.xres, vinfo.yres, vinfo.bitsperpixel );

Figure out the size of the screen in bytes screensize = vinfo.xres * vinfo.yres * vinfo.bitsperpixel 8;

Map the device to memory fbp = (char *)mmap(0, screensize, PROTREAD PROTWRITE, MAPSHARED, fbfd, 0); if ((int)fbp == -1) fail("Error: failed to map framebuffer device to memory.-n");

Now setup FreeType FTLibrary library; FTFace face;

int error = FTInitFreeType( &library ); if ( error ) { fail ("Failed to initialise FreeType"); }

error = FTNewFace( library, "-usr-share-fonts-truetype-ttf-bitstream-vera-VeraMono.ttf", 0, &face ); if ( error == FTErrUnknownFileFormat ) { fail ("Unsupported font format"); } else if ( error ) { fail ("Error reading font file"); }

error = FTSetCharSize ( face, 0, 12 * 64, 100, 100 ); if (error) { fail ("Error setting char size"); }

Display each ACII printable char { FTUInt glyphindex = FTGetCharIndex (face, n);

FTLoadGlyph (face, glyphindex, FTLOADDEFAULT);

FTRENDERMODENORMAL);

if (error) { fail ("Error rendering glyph"); }

if (n == '') continue;

{ location = ((x + 0)+vinfo.xoffset) * (vinfo.bitsperpixel-8) + ((y + 0)+vinfo.yoffset) * finfo.linelength;

if ( vinfo.bitsperpixel == 32 ) { *(fbp + location) = 0; Some blue *(fbp + location + 1) = 0; A little green *(fbp + location + 2) = 0; A lot of red *(fbp + location + 3) = 0; No transparency } else {-buttume 16bpp int b = 0; int g = 0; A little green int r = 0; A lot of red *((unsigned short int*)(fbp + location)) = t; } }

{ (vinfo.bitsperpixel-8) +

Blank the drawing area if ( vinfo.bitsperpixel == 32 ) { *(fbp + location) = grayval; *(fbp + location + 1) = grayval; *(fbp + location + 2) = grayval; *(fbp + location + 3) = 0; } else {-buttume 16bpp int b = 10; int g = 6; A little green int r = 16; A lot of red *((unsigned short int*)(fbp + location)) = t; } }

sleep (1); }

return 0; }

- -- Roger Leigh GPG Public Key: 0x25BFB848. Please sign and encrypt your mail. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU-Linux)

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