Loading and draw images

Loading and draw images

SkrotOxD

Member #13,250

August 2011

Hello,

I´m having some trouble with Images on Allegro. As I wasn´t able to find really helpful tutorials on Allegro 5 I decided to read API specification
As I understood I have to use an external module to handle Images and this should be allegro5/allegro_image.h. Than I used al_init_image_addon.

For loading ALLEGRO_BITMAP *img = al_load_bitmap(char *path);

Still, when I verify the var img (if img == NULL)
I get true ever.

Am I missing something?

P.S. Sorry if I have any grammatical mistakes, still relearning english

William Labbett

Member #4,486

March 2004

What are you passing for const char * ?

Is it an image in the directory where you're program is ?

SkrotOxD

Member #13,250

August 2011

At first I was passing a fully qualified path

C:\way to my image\img.bmp

When it failed I´ve changed to the relative

img.bmp

And the image was side by side with the .exe on Debug folder

I´m programming on Visual Studio 2010

As a Image worths more than words, I will put the code, hope it helps

#SelectExpand
  1#include <stdio.h>
  2#include <allegro5/allegro.h>
  3#include <allegro5/allegro_image.h>

  5int main(int argc, char **argv)
  6{
 ALLEGRO_DISPLAY *display = NULL;
 ALLEGRO_EVENT_QUEUE *event_queue = NULL;

 if(!al_init()) {
    fprintf(stderr, "failed to initialize allegro!\n");
    return -1;
 }

 display = al_create_display(640, 480);
 if(!display) {
    fprintf(stderr, "failed to create display!\n");
    return -1;
 }
 20
 event_queue = al_create_event_queue();
 if( event_queue == NULL ){
   fprintf(stderr, "failed to create event queue\n");
   al_destroy_display(display);
 }
  al_register_event_source(event_queue, al_get_display_event_source(display));
 27
//Inicia o manipulador de imagens e verifica se teve sucesso
if( !al_init_image_addon() ){
  fprintf(stderr, "Could not init image addon\n");
    al_destroy_display(display);
  al_destroy_event_queue(event_queue);
}
 34
 al_clear_to_color(al_map_rgb(0,0,0));

 al_flip_display();

 while(true){
   ALLEGRO_EVENT ev;
   ALLEGRO_TIMEOUT timeout;
   al_init_timeout(&timeout, 0.06);
 43
   bool get_event = al_wait_for_event_until(event_queue, &ev, &timeout);
 45
   if( get_event && ev.type == ALLEGRO_EVENT_DISPLAY_CLOSE){
     ALLEGRO_BITMAP *img = al_load_bitmap("pic.bmp");
     if( img == NULL ){
       fprintf(stderr, "Load of \"pic\" image failed \n");
       break;
     }
     al_draw_bitmap(img, 0 , 0 , NULL);
     al_flip_display();
     al_rest(5.0);
     break;
   }
 57
   al_clear_to_color(al_map_rgb(0,0,0));
   al_flip_display();
 }

 al_destroy_display(display);
al_destroy_event_queue(event_queue);
al_shutdown_image_addon();
 65
 return 0;
 67}