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/* Function: FDV_SHOW_BMP 
   Purpose:  Loads and shows a BMP file ( 320x200x256 ) 
   Parameters: nome_raw = BMP file name
   Return:   0 = failure, 1 = OK
   Compiler: Watcom C/C++ 11.0 (32bit Protected Mode - DOS4GW) 
   Author: Fabio D. Vecchia
   Extracted from Fabio Vecchia's Game Library (c) 1995 - (FDV_LB95)
*/

short fdv_show_bmp(char *nome_bmp)
{
   FILE *arq_bmp;
   unsigned char pal_aux[1024], pal_ok[768];
   unsigned char *imagem, *buf_pal;
   int inic_imagem=0, i=256;

   if ((arq_bmp = fopen(nome_bmp, "rb"))==NULL) {
     printf("\nArquivo nao encontrado - File not Found\n");
     getch();
     return 0;
   }

   // le paleta e rotaciona para BIOS  (read PAL and rotate -> BIOS)
   fseek(arq_bmp,54,0);  // pula header inutil
   fread(pal_aux,1,1024,arq_bmp); // le paleta de 1024 bytes   
   for (short a=0; a<256; a++)
     for (short b=0; b<3; b++)
        pal_ok[a*3+b] = (pal_aux[a*4+(2-b)]) >> 2;

   // le posicao do inicio da imagem  (read init position)
   fseek(arq_bmp,10,0);
   fread(&inic_imagem, 1, sizeof(inic_imagem), arq_bmp);

   // posiciona no inicio do BMP e le imagem de 64Kb  (read BMP)
   fseek(arq_bmp,inic_imagem,0);
   imagem = new unsigned char [64000L];
   for (int y = 199; y>=0; y--)
     for (int x=0; x<320; x++)
       imagem[y*320+x] = (unsigned char) fgetc(arq_bmp);
    
   // inicializa video e mostra paleta   (init video and show PAL)
   fdv_modo_video(0x13);  
   outp(0x03c8, 0);
   buf_pal = pal_ok;
   i=256;
   while (i--) {
	outp(0x03c9, *buf_pal++);
	outp(0x03c9, *buf_pal++);
	outp(0x03c9, *buf_pal++);
   }
 
   // mostra imagem     (shows BMP)
   memcpy(buf_tela, imagem, 64000L);

   // aguarda tecla     (wait key)
   getch();

   // Libera memoria e fecha BMP   (free memory and close BMP)
   delete imagem;       
   fclose(arq_bmp);

   fdv_modo_video(0x03);   

   return 1;
}