frob

pixelflut.c

@@ -0,0 +1,72 @@
+
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+
+#define PIXEL_FORMAT "PX %zd %zd %02x%02x%02x\n"
+int cct(const char *target, int port) {
+    printf("Reconnecting %s:%d\n", target, port);
+    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
+    if (!sockfd) {
+        fprintf(stderr, "No sockfd.\n");
+        return -1;
+    }
+
+    struct sockaddr_in serv_addr; 
+    memset(&serv_addr, 0, sizeof(serv_addr)); 
+    serv_addr.sin_family = AF_INET;
+    serv_addr.sin_port = htons(port); 
+    if (inet_pton(AF_INET, target, &serv_addr.sin_addr) != 1) {
+        fprintf(stderr, "Address error. \"%s\"\n", target);
+        return -2;
+    }
+
+    if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr))) {
+        fprintf(stderr, "Connect error.\n");
+        return -3;
+    }
+
+    return sockfd;
+}
+
+int sendframe(int fd, uint8_t *img, int w, int h, int ox, int oy) {
+    static unsigned long fcnt=0;
+    printf("frame %lu %dx%d @pos %dx%d\n", fcnt++, w, h, ox, oy);
+    int fmtlen = snprintf(NULL, 0, PIXEL_FORMAT, (size_t)1000, (size_t)1000, 0xff, 0xff, 0xff);
+    char *out = malloc(1400);
+    if (!out) {
+        fprintf(stderr, "Malloc error.\n");
+        return -4;
+    }
+    char *p = out;
+    for (size_t x=0; x<w; x++) {
+        for (size_t y=0; y<h; y++) {
+            uint8_t *px = img + (y*w + x)*4;
+            uint8_t r = px[0], g = px[1], b = px[2], a = px[3];
+            if (a != 255)
+                continue;
+            size_t cx = ox+x, cy = oy+y;
+            p += snprintf(p, fmtlen+1, PIXEL_FORMAT, cx, cy, r, g, b);
+            if (p-out > 1400-fmtlen-1) {
+                if (send(fd, out, p-out, 0) < 0) {
+                    fprintf(stderr, "Send error. %d %s\n", errno, strerror(errno));
+                    return -5;
+                }
+                p = out;
+            }
+        }
+    }
+    free(out);
+    usleep(1000);
+    return 0;
+}
+
+void discct(int fd) {
+    close(fd);
+}