Update fltk (#169)

- Fixes #163
- Reimplements window resize
  - Still has problems on macOS; Resizing with the drag handle blocks the main loop. See:
    - glfw/glfw#1251
    - rust-windowing/winit#219

examples/minimal-fltk/Cargo.toml

@@ -10,7 +10,7 @@ optimize = ["log/release_max_level_warn"]
 default = ["optimize"]
 
 [dependencies]
-fltk = { version = "1.0", features = ["no-images", "no-pango"] }
+fltk = { version = "1.0.14", features = ["no-images", "no-pango"] }
 env_logger = "0.8"
 log = "0.4"
 pixels = { path = "../.." }

examples/minimal-fltk/src/main.rs

@@ -2,7 +2,7 @@
 #![forbid(unsafe_code)]
 #![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
 
-use fltk::{app, prelude::*, window::Window};
+use fltk::{app, enums::Event, prelude::*, window::Window};
 use log::error;
 use pixels::{Error, Pixels, SurfaceTexture};
 use std::{thread, time::Duration};
@@ -26,19 +26,30 @@ fn main() -> Result<(), Error> {
     let mut win = Window::default()
         .with_size(WIDTH as i32, HEIGHT as i32)
         .with_label("Hello Pixels");
+    win.make_resizable(true);
     win.end();
     win.show();
 
     let mut pixels = {
-        let surface_texture = SurfaceTexture::new(WIDTH, HEIGHT, &win);
+        let pixel_width = win.pixel_w() as u32;
+        let pixel_height = win.pixel_h() as u32;
+        let surface_texture = SurfaceTexture::new(pixel_width, pixel_height, &win);
         Pixels::new(WIDTH, HEIGHT, surface_texture)?
     };
 
     let mut world = World::new();
 
     while app.wait() {
+        // Handle window events
+        if app::event() == Event::Resize {
+            let pixel_width = win.pixel_w() as u32;
+            let pixel_height = win.pixel_h() as u32;
+            pixels.resize_surface(pixel_width, pixel_height);
+        }
+
         // Update internal state
         world.update();
+
         // Draw the current frame
         world.draw(pixels.get_frame());
         if pixels
@@ -49,6 +60,7 @@ fn main() -> Result<(), Error> {
             app.quit();
         }
         win.redraw();
+
         // Calls to redraw in the event loop require an explicit sleep
         thread::sleep(Duration::from_millis(SLEEP));
     }