img_demo.c

eCos操作系统源码

#include <stdio.h>  
#include <stdlib.h> 
#include <unistd.h>
#include <string.h> 
#include <network.h>
#include <tftp_support.h>
#include <dirent.h>
#include <errno.h>
#include <cyg/kernel/kapi.h>            /* All the kernel specific stuff */
#include <cyg/infra/diag.h>        

#define MWINCLUDECOLORS
#include "nano-X.h"

static int show_time = 5;

//
// Component interfaces
//

static void
fdprintf(int fd, char *fmt, ...)
{
    char msg[256];
    int ret;
    va_list ap;

    // Ignore if no 'fd'
    va_start(ap, fmt);
    ret = vsprintf(msg, fmt, ap);
    va_end(ap);
    diag_printf(msg);
    if (fd <= 0) return;
    write(fd, msg, strlen(msg));
}

void
show_jpeg(int client, char *file, int show_time)
{
    GR_EVENT        event;          /* current event */
    GR_IMAGE_ID     id = 0;
    GR_SIZE         w = -1;
    GR_SIZE         h = -1;
    GR_IMAGE_INFO   info;
    GR_WINDOW_ID    w1;             /* id for large window */
    GR_GC_ID        gc1;            /* graphics context for text */
    GR_SCREEN_INFO  si;

    int time_left;
    bool ever_exposed = false;

#if !defined(HAVE_JPEG_SUPPORT) && !defined(HAVE_BMP_SUPPORT) && !defined(HAVE_GIF_SUPPORT)
    printf("Sorry, no image support compiled in\n");
    exit(1);        
#endif

    GrGetScreenInfo(&si);
    printf("Loading image: %s\n", file);
    if (access(file, F_OK) < 0) {
        fdprintf(client, "Can't access \"%s\": %s\n", file, strerror(errno));
        return;
    }
    id = GrLoadImageFromFile(file, 0);
    if (id) {
        GrGetImageInfo(id, &info);
    } else {
        // File exists, so why the error?
        int fd, len;
        char buf[64];
        fdprintf(client, "Can't load %s\n", file);
        if ((fd = open(file, O_RDONLY)) >= 0) {
            len = read(fd, buf, 64);
            if (len != 64) {
                diag_printf("Short read? len = %d\n", len);
            } else {
                diag_dump_buf(buf, len);
            }
            close(fd);
        } else {
            diag_printf("Can't oopen \"%s\": %s\n",  file, strerror(errno));
        }
        return;
    }

    w = info.width;
    h = info.height;
    if ((si.rows < info.height) || (si.cols < info.width)) {
        // Preserve aspect ratio
        if (si.cols < info.width) {
            w = si.cols;
            h = (si.cols * info.height) / info.width;
        }
        if (si.rows < h) {
            w = (si.rows * w) / h;
            h = si.rows;
        }
    }
    printf("Create window - orig %dx%d => %dx%d\n", info.width, info.height, w, h);
    fdprintf(client, "<INFO> Display \"%s\" - orig %dx%d => %dx%d\n", file, info.width, info.height, w, h);
    w1 = GrNewWindow(GR_ROOT_WINDOW_ID, 10, 10, w, h, 4, BLACK, WHITE);
    GrSelectEvents(w1, GR_EVENT_MASK_CLOSE_REQ|GR_EVENT_MASK_EXPOSURE);
    GrMapWindow(w1);
    gc1 = GrNewGC();
    GrSetGCForeground(gc1, WHITE);

#define TO_MS 50
    time_left = show_time * 1000;
    while (time_left > 0) {
        GrGetNextEventTimeout(&event, TO_MS);  // milliseconds
        switch(event.type) {
        case GR_EVENT_TYPE_CLOSE_REQ:
            GrDestroyWindow(w1);
            GrFreeImage(id);
            return;
            /* no return*/
        case GR_EVENT_TYPE_EXPOSURE:
            /*GrDrawImageFromFile(w1, gc1, 0, 0, w, h, argv[1],0);*/
            GrDrawImageToFit(w1, gc1, 0, 0, w, h, id);
            ever_exposed = true;
            break;
        default:
        case GR_EVENT_TYPE_NONE:
        case GR_EVENT_TYPE_TIMEOUT:
            time_left -= TO_MS;
            if ((time_left < 0) && !ever_exposed) {
                // Things get real cranky if we delete the window too fast!
                time_left = TO_MS;
            }
            break;
        }
    }    
    GrUnmapWindow(w1);
    GrDestroyWindow(w1);
    GrDestroyGC(gc1);
    GrFreeImage(id);
}

static void
do_ls(int client, char *buf)
{
    int err;
    DIR *dirp;
    int num=0;
    char name[256];

    buf += 2;  // Skip over command
    while (*buf && (*buf == ' ')) buf++;
    if (*buf) {
        // Name provided
        strcpy(name, buf);
    } else {
        strcpy(name, ".");
    }
    
    fdprintf(client, "<INFO> reading directory %s\n",name);
    dirp = opendir( name );    
    if( dirp == NULL ) {
        fdprintf(client, "Can't open directory \"%s\"\n", name);
        return;
    }
    for(;;) {
        struct dirent *entry = readdir( dirp );
        struct stat sbuf;
        char fullname[PATH_MAX];
        
        if( entry == NULL )
            break;
        num++;
        diag_printf("<INFO> entry %s",entry->d_name);
        fdprintf(client, "<INFO> entry %14s",entry->d_name);
        if( name[0] ) {
            strcpy(fullname, name );
            if( !(name[0] == '/' && name[1] == 0 ) )
                strcat(fullname, "/" );
        }
        else fullname[0] = 0;
        strcat(fullname, entry->d_name );
        err = stat( fullname, &sbuf );
        if( err < 0 ) {
            if( errno == ENOSYS ) {
                fdprintf(client, " <no status available>");
            } else {
                diag_printf(" - error %s\n", strerror(errno));
                fdprintf(client, " - error %s\n", strerror(errno));
            }
        } else {
            diag_printf(" [mode %08x ino %08x nlink %d size %d]\n",
                        sbuf.st_mode,sbuf.st_ino,sbuf.st_nlink,sbuf.st_size);
            fdprintf(client, " [mode %08x ino %08x nlink %d size %d]\n",
                     sbuf.st_mode,sbuf.st_ino,sbuf.st_nlink,sbuf.st_size);
        }
    }
    err = closedir( dirp );
}

static void
do_show(int client, char *buf)
{
    char name[256];

    buf += 4;  // Skip over command
    while (*buf && (*buf == ' ')) buf++;
    if (*buf) {
        // Name provided
        strcpy(name, buf);
    } else {
        fdprintf(client, "usage: show <file>\n");
        return;
    }
    show_jpeg(client, name, show_time);
}

static void
do_show_all(int client, char *buf)
{
    int err;
    DIR *dirp;
    char *c, name[256];

    buf += 8;  // Skip over command
    while (*buf && (*buf == ' ')) buf++;
    if (*buf) {
        // Name provided
        strcpy(name, buf);
    } else {
        strcpy(name, ".");
    }
    
    fdprintf(client, "<INFO> show .jpg files in directory %s\n",name);
    dirp = opendir( name );    
    if( dirp == NULL ) {
        fdprintf(client, "Can't open directory \"%s\"\n", name);
        return;
    }
    for(;;) {
        struct dirent *entry = readdir( dirp );
        struct stat sbuf;
        char fullname[PATH_MAX];
        
        if( entry == NULL )
            break;
        if( name[0] ) {
            strcpy(fullname, name );
            if( !(name[0] == '/' && name[1] == 0 ) )
                strcat(fullname, "/" );
        }
        else fullname[0] = 0;
        strcat(fullname, entry->d_name );
        err = stat( fullname, &sbuf );
        if( err < 0 ) {
            fdprintf(client, "<ERROR> Can't access \"%s\":", fullname);
            if( errno == ENOSYS ) {
                fdprintf(client, " <no status available>");
            } else {
                fdprintf(client, "%s\n", strerror(errno));
            }
        } else {
#if 0
            if (/* hack: !S_ISREG(sbuf.st_mode)*/ (sbuf.st_mode & 0x8000) == 0) {
                continue;
            }
#endif
            if ((c = rindex(fullname, '.')) != (char *)NULL) {
                if (strcmp(c, ".jpg") == 0) {
                    show_jpeg(client, fullname, show_time);
                }
            }
        }
    }
    err = closedir( dirp );
}

static void
do_time(int client, char *buf)
{
    char *cp;
    int val;

    buf += 4;  // Skip over command
    while (*buf && (*buf == ' ')) buf++;    
    if (*buf) {
        // value provided
        val = strtol(buf, &cp, 0);
        if (val > 0) {
            show_time = val;
            fdprintf(client, "<INFO> time set to %d seconds\n", val);
            return;
        }
    }
    fdprintf(client, "usage: time <value>\n");
}

static void
do_get(int client, char *buf)
{
    char *fn, *sn, *data;
#ifdef CYGPKG_FS_RAM
    char _fn[PATH_MAX];
#endif