al_draw_text problem

William Labbett

Hi,
I'm trying to write text to a bitmap with a truetype font. My program crashes at the
call to al_draw_text(). I haven't managed to work out why.

#SelectExpand
   1#include <stdio.h>
   2#include <stdlib.h>
   3#include <time.h>
   4
   5#include <allegro5/allegro.h>
   6
   7#include <allegro5/allegro_image.h>
   8#include <allegro5/allegro_font.h>
   9#include <allegro5/allegro_ttf.h>
  10#define WRITE(string) fprintf(output, string)
  11
  12
  13
  14int initialise_allegro(void);
  15
  16
  17int main()
  18{
  FILE *output = NULL;
  ALLEGRO_FONT *font;
  ALLEGRO_BITMAP *bitmap = NULL;
  ALLEGRO_DISPLAY *display = NULL;
  ALLEGRO_COLOR colour;
  24
  const char *text = "783";
  26
  output = fopen("output.txt", "w");
  28
  srand(time(NULL));
  30
  if(initialise_allegro() == 1)
  {
      printf("Initialise allegro failed.\n");
      return 1;
  }
  36
  display = al_create_display(640, 480);
  if(display == NULL)
  {
      printf("Couldn't create display.\n");
      return 1;
  }
  printf("10\n");
  44
  colour = al_map_rgba(255, 255, 255, 255);
  46
  al_set_new_bitmap_flags(ALLEGRO_VIDEO_BITMAP);
  al_set_new_bitmap_format(ALLEGRO_PIXEL_FORMAT_ANY_32_WITH_ALPHA);
  bitmap = al_create_bitmap(72, 12);
  if(bitmap == NULL)
  {
     printf("Couldn't create a bitmap.");
     return 0;
  }
  else
  {
      printf("20\n");
  }
  al_set_target_bitmap(bitmap);
  printf("30\n");
  al_clear_to_color(colour);
  printf("40\n");
  if(bitmap == NULL)
  {
      printf("bitmap NULL.\n");
      return 1;
  }
  else
  {
      printf("45\n");
  }
  72
  73
  font = al_load_ttf_font("SimpleRonde-Regular.ttf", 12, 0);
  if(font == NULL)
  {
     printf("Couldn't load font.");
     return 1;
  }
  else
  {
     printf("Loaded font.\n");
  }
  84
  85
  86
  if(font == NULL)
  {
     printf("Font pointer NULL\n");
     return 1;
  }
  else
  {
     printf("font pointer not null.\n");
  }
  al_set_target_bitmap(bitmap);
  if(font == NULL)
  {
     printf("Font pointer NULL\n");
     return 1;
  }
  else
  {
     printf("font pointer not null.\n");
  }
  if(bitmap == NULL)
  {
      printf("bitmap NULL.\n");
      return 1;
  }
  else
  {
      printf("bitmap not NULL\n");
  }
  al_draw_text(font, al_map_rgb(0, 0, 0), 0, 0, 0, "222");
  printf("50\n");
  if(bitmap == NULL)
  {
      printf("Can't save bitmap.\n");
      return 1;
  }
  printf("bitmap width = %d", al_get_bitmap_width(bitmap));
  if(al_save_bitmap("bitmap.bmp", bitmap) == false)
  {
      printf("Failed to save bitmap.\n");
      return 1;
  }
  else
  {
      printf("Saved bitmap.\n");
  }
 132
  printf("30\n");
 134
  if(output == NULL)
  {
     printf("file pointer \"output\" is NULL. Couldn't open file.");
     return 1;
  }
 140
  fprintf(output, "\\documentclass(article)\n");
 142
  fprintf(output, "\\title(Arithmetic Practice)");
 144
  WRITE("\n\\includepackage(graphicx)");
  WRITE("\n\\usepackage(amsmath)");
  WRITE("\n\\begin(document)");
 148
 149
 150
  fclose(output);
  return 0;
 153}
 154
 155
 156int initialise_allegro()
 157{
 al_install_system(ALLEGRO_VERSION_INT, atexit);
 159
 160
 161
 if(al_init_image_addon() == false)
 {
     printf("Couldn't initialise image addon.");
     return 1;
 }
 167
 168
 al_init_font_addon();
 if(al_init_ttf_addon() == false)
 {
     printf("Couldn't initialise truetype font addon\n");
     return 1;
 }
 175
 176
 return 0;
 178}

Frank Drebin

I tried using the font Arial and it seemed to work fine:

10
20
30
40
45
Loaded font.
font pointer not null.
font pointer not null.
bitmap not NULL
50
bitmap width = 72Saved bitmap.
30

Maybe there's something wrong with your font file?

William Labbett

Hi,

not wanting to be a pain but I've swapped the code to load arial.ttf and it still does what it used to on my computer. It obviously doesn't do the same on my computer as it does on your computer.
I wonder why.

I've got

liballegro-5.0.10-monolith-md.a

as the linker options.

Could it be that my PATH variable isn't set up properly so the program can find the files it needs. I'm using Windows 8 and code::blocks

Frank Drebin

I'm using Allegro 5.2.4. Why don't you switch to a more recent version of Allegro?

What is the output on your computer?

William Labbett

The console prints out :

10
20
30
40
45
Loaded font.
font pointer not null.
font pointer not null.
bitmap not NULL

Process returned -1073741819 (0xC0000005) execution time : 2.007 s
Press any key to continue.

I'll try the version your using and see how that goes.

Edgar Reynaldo

You're not checking the return value of al_install_system. It's probably failing due to runtime problems. Ie. mixed versions of dll and headers.

Thread #617920. Printed from Allegro.cc