From: "Lasse Hassing" <lazer_hassing AT yahoo DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Error blitting to bitmap
Date: Tue, 26 Oct 1999 21:32:30 +0200
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

I'm having problem blitting to a mem. bitmap
Please help

Source:
// --------------------------------------------------------------
#include <stdlib.h>
#include <stdio.h>
#include <allegro.h>

BITMAP *FlukkiB;
PALETTE MyPal;
RLE_SPRITE *Flukki;
int Fx;
int Fy;

  file://BackBuffer
  BITMAP *back_buffer;


void DoBlit(void);
void BlitTimer(void);

int main() {
  FlukkiB = load_pcx("flukki.pcx", MyPal);

  generate_optimized_palette(FlukkiB, MyPal, NULL);

  MyPal[0].r = 0;
  MyPal[0].g = 0;
  MyPal[0].b = 0;


  // init Allegro!!
  allegro_init();

  // Setup keyboard
  install_keyboard ();
  // Install Timer
  install_timer ();
  // Set GFX driver
  set_gfx_mode(GFX_AUTODETECT, 320, 240, 320, 240);
  // Set color depth
  set_color_depth(32);
  // Set Sound (NOT USED YET!)
  // install_sound(DIGI_AUTODETECT, MIDI_AUTODETECT,0);

  // Set active palete
  set_pallete(MyPal);

  // Create 'Flukki'
  Flukki = get_rle_sprite(FlukkiB);

  back_buffer = create_bitmap(320, 240);
  clear(back_buffer);

  Fx = 10;
  Fy = 190;

  install_int(BlitTimer, 1000);
  for(;;)
  {
    if (key[KEY_ESC])
    break;   }

  destroy_bitmap(back_buffer);

  return 0;
}

void DoBlit(void)
{
  draw_rle_sprite(back_buffer, Flukki, Fx, Fy);
}

void BlitTimer(void)
{
  DoBlit();
}
END_OF_FUNCTION(BlitTimer);
// --------------------------------------------------------


If I replace :
  draw_rle_sprite(back_buffer, Flukki, Fx, Fy);
With:
  draw_rle_sprite(screen, Flukki, Fx, Fy);
It work fine.

Why?


---Lasse Hassing