expat.c from Allegro game programming library at Krugle

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/*
 *    Example program for the Allegro library, by Shawn Hargreaves.
 *
 *    This program demonstrates the use of patterned drawing and sub-bitmaps.
 */


#include "allegro.h"



void draw_pattern(AL_BITMAP *bitmap, char *message, int color)
{
   AL_BITMAP *pattern;

   al_acquire_bitmap(bitmap);

   /* create a pattern bitmap */
   pattern = al_create_bitmap(al_text_length(al_font_8x8, message), al_text_height(al_font_8x8));
   al_clear_to_color(pattern, al_bitmap_mask_color(pattern));
   al_put_text(pattern, al_font_8x8, message, 0, 0, al_palette_color[255]);

   /* cover the bitmap with the pattern */
   al_drawing_mode(DRAW_MODE_MASKED_PATTERN, pattern, 0, 0);
   al_draw_rect_fill(bitmap, 0, 0, bitmap->w, bitmap->h, al_palette_color[color]);
   al_drawing_mode(DRAW_MODE_SOLID, NULL, 0, 0);

   /* destroy the pattern bitmap */
   al_destroy_bitmap(pattern);

   al_release_bitmap(bitmap);
}



int main()
{
   AL_BITMAP *bitmap;

   allegro_init();
   al_install_keyboard();
   if (al_set_gfx_mode(AL_GFX_SAFE, 320, 200, 0, 0) != 0) {
      al_set_gfx_mode(AL_GFX_NONE, 0, 0, 0, 0);
      al_show_message("Unable to set any graphic mode\n%s\n", al_error);
      return 1;
   }
   al_set_palette(al_desktop_palette);
   al_clear_to_color(al_screen, al_make_color(255, 255, 255));
   al_text_mode(al_bitmap_mask_color(al_screen));
   
   /* first cover the whole al_screen with a pattern */
   draw_pattern(al_screen, "<al_screen>", 255);

   /* draw the pattern onto a memory bitmap and then al_blit it to the al_screen */
   bitmap = al_create_bitmap(128, 32);
   al_clear_to_color(bitmap, al_make_color(255, 255, 255));
   draw_pattern(bitmap, "<memory>", 1);
   al_blit_masked(bitmap, al_screen, 0, 0, 32, 32, 128, 32);
   al_destroy_bitmap(bitmap);

   /* or we could use a sub-bitmap. These share video memory with their
    * parent, so the drawing will be visible without us having to al_blit it
    * across onto the al_screen.
    */
   bitmap = al_create_sub_bitmap(al_screen, 224, 64, 64, 128);
   al_draw_rect_fill(al_screen, 224, 64, 286, 192, al_make_color(255, 255, 255));
   draw_pattern(bitmap, "<subbmp>", 4);
   al_destroy_bitmap(bitmap);

   al_read_key();
   return 0;
}

AL_END_OF_MAIN();
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