Test-Bilderzeugung aus Sender ausgelagert

.gitignore

+test
 sender
 
+

sender.c

 #include<stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <string.h> 
 
-
-#define WIDTH 1000
-#define HEIGHT 8
+#define WIDTH 60
+#define HEIGHT 16
 
 int image[WIDTH*HEIGHT];
-char data[(WIDTH*HEIGHT/8)*6*4+1];
+int image_new[WIDTH*HEIGHT];
+int image_old[WIDTH*HEIGHT];
+char data[(WIDTH*HEIGHT/8)*6*4+3];
 
 
 void image2data(int* image, char* data, int layout) {
-  int offset = 1;
+  int offset = 3;
   int x, y, xbegin, xend, xinc, mask;
   int linesPerPin = HEIGHT / 8;
   int pixel[8];
 
+  data[0]='*';
+  data[1]=0; // sync delay, sync immediately.
+  data[2]=0;
+
   for (y = 0; y < linesPerPin; y++) {
     if ((y & 1) == (layout ? 0 : 1)) {
       // even numbered rows are left to right
@@ -62,33 +68,30 @@ int fade(int b, int a, int t)
   return (rc<<0)+(gc<<8)+(bc<<16);
 }
 
-
 int main() {
   
-  int old=0x000000;
-  
   while(1)
   {
-    long int r=rand()>>24;
-    int new=r+((256-r)<<16);
-    for(int t=0; t<256; t+=16)
-    {   
-      for(int i=0; i<WIDTH*HEIGHT; i++)
-        //image[i]=c+(c<<8)+(c<<16)+(c<<24);
-        //image[i]=c;
-        image[i]=fade(old,new,t);
 
-      fprintf(stderr,"Data size: %i \n", (int)  sizeof(data));
+    int read=fread(image_new,1,sizeof(image_new),stdin);
+    fprintf(stderr,"Sender input size: %i \n", (int)read);
+
+    // do a fade
+    for(int t=0; t<256; t+=1)
+    {
+      for(int i=0; i<sizeof(image)/4; i++)
+        image[i]=fade(image_old[i],image_new[i],t);
       
       image2data(image,data,0);
 
       int written=fwrite(data,1,sizeof(data),stdout);
       fflush(stdout);
 
-      fprintf(stderr,"Data written: %i \n", written);
+      fprintf(stderr,"Sender output written: %i \n", written);
 
       usleep(2000L);
    }
-    old=new;
+
+   memcpy(image_old,image_new,sizeof(image_old));
   }
 }

test.c

+#include<stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+
+#define WIDTH 60
+#define HEIGHT 16
+
+char image[WIDTH*HEIGHT*4];
+
+
+
+int main() {
+  while(1)
+  {
+
+    for(int i=0; i<WIDTH*HEIGHT; i++)
+    {
+      int c=rand() & 0x1F1F1F;
+      image[i*4+0]=(c >>  0) & 0xFF;
+      image[i*4+1]=(c >>  8) & 0xFF;
+      image[i*4+2]=(c >> 16) & 0xFF;
+      image[i*4+3]=0;
+    }
+
+    int written=fwrite(image,1,sizeof(image),stdout);
+    fflush(stdout);
+    fprintf(stderr,"Test image data written: %i \n", written);
+  }
+}