[MSX-C] Q&A official thread

I think you should be able to just do a rstplt() immediately after loading the file into VRAM. I haven't tried, but I think that rstplt() does exactly the same as COLOR=RESTORE in BASIC.

No, that's not what I meant. What I meant is that if the palette information was embedded in the image (as is the case on images generated via BSAVE or .GE5 files created with DD倶楽部), then you can just do a rstplt() instead of making another function just to set the colors.

This would be the modified program. I've actually modified main() to take the file name from the command line, and I've modified the fread() loop in loadimg() to actually check that we're not reaching the end of file:

#include 
#include 

#define PAGE0   0x0000
#define PAGE1   0x8000

#define SCREEN5 (TINY)5
#define SCREEN0 (TINY)0

#define BUFSIZE 1024

VOID    loadImg(filename)
char    *filename;
{
        FILE    *fp;
        char    buf[BUFSIZE];
        int     i, nread;
        int     vrami = PAGE0;

        if ((fp = fopen(filename, "rb"))) {
                fread(buf, 7, 1, fp);   /* Skip 7-byte header */

                /* Read the file to VRAM */
                while ((nread = fread(buf, sizeof(char), BUFSIZE, fp))) {
                        ldirvm(vrami, buf, nread);
                        vrami += BUFSIZE;
                }

                fclose(fp);
        } else {
                return;
        }
}

VOID    main(argc, argv)
int     argc;
char    *argv[];
{
        if (argc < 2) {
                printf("Usage: GE5READ \n");
                exit(0);
        }

        screen(SCREEN5);
        loadImg(argv[1]);
        rstplt();
        getchar();
        screen(SCREEN0);
}

#include 
[...]

Hmmm, the < and > aren't displayed properly. Let me try again:

#include <stdio.h>
#include <glib.h>

#define PAGE0   0x0000
#define PAGE1   0x8000

#define SCREEN5 (TINY)5
#define SCREEN0 (TINY)0

#define BUFSIZE 1024

VOID    loadImg(filename)
char    *filename;
{
        FILE    *fp;
        char    buf[BUFSIZE];
        int     i, nread;
        int     vrami = PAGE0;

        if ((fp = fopen(filename, "rb"))) {
                fread(buf, 7, 1, fp);   /* Skip 7-byte header */

                /* Read the file to VRAM */
                while ((nread = fread(buf, sizeof(char), BUFSIZE, fp))) {
                        ldirvm(vrami, buf, nread);
                        vrami += BUFSIZE;
                }

                fclose(fp);
        } else {
                return;
        }
}

VOID    main(argc, argv)
int     argc;
char    *argv[];
{
        if (argc < 2) {
                printf("Usage: GE5READ <filename>\n");
                exit(0);
        }

        screen(SCREEN5);
        loadImg(argv[1]);
        rstplt();
        getchar();
        screen(SCREEN0);
}

@JaviLM 50Kb is a great amount, thanks. Perhaps it's time to try next thing, I'm going to try some image manipulation as scrolls. This implies to play with interrupts in order not to get teering, so it's a good chance to learn about interruption handle in C.

The thread is being really interesting, I think that all of us are learning some things about MSX-C Thanks everybody for your colaboration

Oh, and by the way, the message about the 39528 bytes free is from the linker (L80). It's not related to how much memory you have for your program.