[cairo] Newbie questions on fonts

[Baz]

I may have figured out your 'only shows squares' problem. I didn't put
2+2 together that you were getting this problem with pdfs on the Mac,
so you're probably using Preview. (slaps forehead).... Adrian's done a
pile of work since 1.4.10 to improve pdf output, in particular there
were problems displaying pdfs with embedded fonts in Preview - the bug
looks exactly as you describe.

If you're able to, can you check your pdf output with something else -
pretty much anything else workes, eg xpdf, acrobat. Or alternatively,
if you could build with cairo from git, you should get the bugfixed
version. I've raised a bug with Apple about this, hopefully Preview
will be fixed sometime soon.

On to your code...

On 16/10/2007, Fred Clare <fred at ucar.edu> wrote:
> Can you see anything obviously wrong with my complete code?:

A few things not to do with your font problems, none serious...

> #include <math.h>
> #include <stdio.h>
> #include <cairo.h>
> #include <cairo-ps.h>
> #include <cairo-ft.h>
>
> #define FILENAME "text_test.ps"
>
> int main (int argc, char *argv[]) {
>
>    FT_Library library;
>    FT_Face    face;
>    int        error;
>
>    cairo_font_face_t *font_face;
>
>    cairo_surface_t *surface;
>    cairo_t *cr;
>

This check:

>    FILE *file;
>    file = fopen (FILENAME, "w");
>    if (file == NULL) {
>      fprintf (stderr, "Failed to open file %s for writing.\n",
> FILENAME);
>      return 1;
>    }

... is unnecessary - cairo_ps_surface_create does it too. You can
check the status of the surface returned by cairo_ps_surface_create
instead.

>
>    error = FT_Init_FreeType( &library );
>    if ( error )
>      {
>        printf("Error initializing FreeType library\n");
>        return 1;
>      }
>
>    error = FT_New_Face( library,
>                         "/Library/Fonts/ArialHBBold.ttf",
>                         0,
>                         &face );
>    if ( error == FT_Err_Unknown_File_Format )
>    {
>        printf("The font file could be opened and read, \n but it
> appears that its font format is unsupported\n");
>        return 1;
>    }
>    else if ( error )
>    {
>        printf("Font file could not be opened or otherwise is broken.
> \n");
>        return 1;
>    }
>
>    font_face = cairo_ft_font_face_create_for_ft_face(face,0);
>
>    surface = cairo_ps_surface_create (FILENAME, 600, 600);
>    cr = cairo_create (surface);
>    cairo_surface_destroy(surface);
>
>    cairo_set_font_face(cr, font_face);
>    cairo_set_font_size (cr, 30);
>    cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
>
>    cairo_move_to (cr, 200, 100);
>    cairo_show_text (cr, "Magnetic");
>
>    cairo_stroke(cr);

This strokes an empty path. cairo_show_text will show the text anyway
(and move the current point).

>    cairo_show_page(cr);
>    cairo_destroy(cr);
>    fclose(file);

Also unnecessary, the file will be closed when you release the surface
(via cairo_destroy)

>
>    return 0;
> }
>
> Thanks much.
>
> Fred Clare

no problem.

-Baz