image: fix base64 and example

examples/image.zig

@@ -18,11 +18,13 @@ pub fn main() !void {
     }
     const alloc = gpa.allocator();
 
-    var vx = try vaxis.init(Event, .{});
+    var vx = try vaxis.init(alloc, .{});
     defer vx.deinit(alloc);
 
-    try vx.startReadThread();
+    var loop: vaxis.Loop(Event) = .{ .vaxis = &vx };
-    defer vx.stopReadThread();
+
+    try loop.run();
+    defer loop.stop();
 
     try vx.enterAltScreen();
 
@@ -38,7 +40,7 @@ pub fn main() !void {
     var n: usize = 0;
 
     while (true) {
-        const event = vx.nextEvent();
+        const event = loop.nextEvent();
         switch (event) {
             .key_press => |key| {
                 if (key.matches('c', .{ .ctrl = true })) {

src/Vaxis.zig

@@ -1,6 +1,6 @@
 const std = @import("std");
 const atomic = std.atomic;
-const base64 = std.base64;
+const base64Encoder = std.base64.standard.Encoder;
 const zigimg = @import("zigimg");
 
 const Cell = @import("Cell.zig");
@@ -580,8 +580,8 @@ pub fn loadImage(
     const png_buf = try alloc.alloc(u8, img.imageByteSize());
     defer alloc.free(png_buf);
     const png = try img.writeToMemory(png_buf, .{ .png = .{} });
-    const b64_buf = try alloc.alloc(u8, base64.calcSize(png.len));
+    const b64_buf = try alloc.alloc(u8, base64Encoder.calcSize(png.len));
-    const encoded = base64.encode(b64_buf, png);
+    const encoded = base64Encoder.encode(b64_buf, png);
     defer alloc.free(b64_buf);
 
     const id = self.next_img_id;