change color of box

src/gui.rs

@@ -88,11 +88,14 @@ impl GUI {
 
         use gl;
         use glutin::{
-            self, dpi::LogicalSize, ElementState, Event, EventsLoop, GlContext, GlWindow,
+            self,
-            KeyboardInput, MouseButton, MouseCursor, VirtualKeyCode, WindowBuilder, WindowEvent,
+            dpi::LogicalSize,
+            os::unix::{WindowBuilderExt, WindowExt, XWindowType},
+            ElementState, Event, EventsLoop, GlContext, GlWindow, KeyboardInput, MouseButton,
+            MouseCursor, VirtualKeyCode, WindowBuilder, WindowEvent,
         };
-        use nanovg::{self, Color, Image, ImagePattern, PathOptions, StrokeOptions};
+        use nanovg::{self, Image, ImagePattern, PathOptions, StrokeOptions};
-        use std::{f32::consts, slice};
+        use std::{f32::consts, mem, slice};
 
         // let attr = window.get_attributes()?;
         // let width = attr.get_width();
@@ -107,6 +110,7 @@ impl GUI {
 
         // TODO: handle error
         let wb = WindowBuilder::new()
+            .with_x11_window_type(XWindowType::Splash)
             .with_decorations(false)
             .with_always_on_top(true)
             .with_dimensions(LogicalSize::new(width.into(), height.into()))
@@ -114,41 +118,39 @@ impl GUI {
         let ctx = glutin::ContextBuilder::new()
             .with_vsync(false)
             .with_multisampling(4)
+            .with_double_buffer(Some(true))
             .with_srgb(true);
         let win = GlWindow::new(wb, ctx, &evl).expect("couldn't make window");
+        win.set_position((0.0, 0.0).into());
+        let f = win.get_hidpi_factor() as f64;
 
         // crosshair
         win.set_cursor(MouseCursor::Crosshair);
-
-        // change window type
-        {
-            use glutin::os::unix::WindowExt;
-            use xlib::Atom;
-            match win.get_xlib_window() {
-                Some(id) => {
-                    let w = Window::create_from_handle(&self.display, id)?;
-                    let key = Atom::new(&self.display, "_NET_WM_WINDOW_TYPE", false)?;
-                    let val = Atom::new(&self.display, "_NET_WM_WINDOW_TYPE_SPLASH", false)?;
-                    w.change_property(&key, &val);
-                }
-                _ => (),
-            }
-        }
-
-        let f = win.get_hidpi_factor() as f64;
-        unsafe {
-            win.make_current().expect("couldn't make window");
-            gl::load_with(|sym| win.get_proc_address(sym) as *const _);
-        }
         // win.set_inner_size((width, height).into());
         // println!("size={:?} pos={:?} outer={:?}", win.get_inner_size(), win.get_inner_position(), win.get_outer_size());
         // println!("{:?}", win.get_hidpi_factor());
 
+        let x = Display::from_handle(win.get_xlib_display().unwrap() as u64);
+        let len;
+        let raw_data;
+        {
+            let _g = x.grab();
+            println!("grabbed");
             // let img = Image2::create_from_drawable(window, 0, 0, 0, width as i32, height as i32, true)?;
             imlib2::context_set_image(&capture);
-        let len = (width * height) as usize;
+            println!("set contexted");
+            len = (width * height) as usize;
             // println!("{}", window.as_raw());
-        let raw_data = unsafe { slice::from_raw_parts(imlib2::image_get_data(), len) };
+            raw_data = unsafe { slice::from_raw_parts(imlib2::image_get_data(), len) };
+            println!("captured");
+
+            unsafe {
+                win.make_current().expect("couldn't make window");
+                gl::load_with(|sym| win.get_proc_address(sym) as *const _);
+            }
+            println!("maked");
+        }
+        mem::forget(x);
 
         // convert ARGB to RGBA
         let mut data = vec![0u32; raw_data.len()];
@@ -158,6 +160,14 @@ impl GUI {
             *i = (*i & 0xff00ff00) | ((*i & 0xff) << 16) | ((*i >> 16) & 0xff);
         }
 
+        // invert image
+        let mut inverted = vec![0u32; raw_data.len()];
+        inverted.copy_from_slice(raw_data);
+        for i in &mut inverted {
+            // fix the colors
+            *i = (*i & 0xff000000) | !(*i & 0xffffff);
+        }
+
         let ctx = nanovg::ContextBuilder::new()
             .build()
             .expect("couldn't init nanovg");
@@ -166,6 +176,10 @@ impl GUI {
             .build_from_rgba(width as usize, height as usize, data.as_slice())
             .expect("couldn't create image");
 
+        let inverted_image = Image::new(&ctx)
+            .build_from_rgba(width as usize, height as usize, inverted.as_slice())
+            .expect("couldn't create image");
+
         let mut running = true;
         let mut down = false;
         // drag start
@@ -178,8 +192,66 @@ impl GUI {
         let mut rectw = 0.0f64;
         let mut recth = 0.0f64;
         let mut delayed_down = false;
-        while running {
         let mut redraw = true;
+        while running {
+            if redraw {
+                // let size = win.get_inner_size().unwrap();
+                // let (width, height) = (size.width as i32, size.height as i32);
+
+                unsafe {
+                    gl::Viewport(0, 0, width as i32, height as i32);
+                    gl::ClearColor(0.3, 0.3, 0.32, 1.0);
+                    gl::Clear(gl::COLOR_BUFFER_BIT | gl::DEPTH_BUFFER_BIT | gl::STENCIL_BUFFER_BIT);
+                }
+
+                let (width, height) = (width as f64, height as f64);
+                ctx.frame((width as f32, height as f32), f as f32, |frame| {
+                    let path_opts = PathOptions::default();
+                    frame.path(
+                        |path| {
+                            path.rect((0.0, 0.0), ((width * f) as f32, (height * f) as f32));
+                            // path.fill(Color::from_rgba(200, 200, 200, 255), Default::default());
+                            path.fill(
+                                ImagePattern {
+                                    image: &image,
+                                    origin: (0.0, 0.0),
+                                    size: (width as f32, height as f32),
+                                    angle: 0.0 / 180.0 * consts::PI,
+                                    alpha: 1.0,
+                                },
+                                Default::default(),
+                            )
+                        },
+                        path_opts,
+                    );
+                    if down && rectw.abs() > 0.0 && recth.abs() > 0.0 {
+                        frame.path(
+                            |path| {
+                                path.rect(
+                                    ((dx * f) as f32, (dy * f) as f32),
+                                    ((rectw * f) as f32, (recth * f) as f32),
+                                );
+                                path.stroke(
+                                    // Color::from_rgba(0, 0, 0, 255),
+                                    ImagePattern {
+                                        image: &inverted_image,
+                                        origin: (0.0, 0.0),
+                                        size: (width as f32, height as f32),
+                                        angle: 0.0 / 180.0 * consts::PI,
+                                        alpha: 1.0,
+                                    },
+                                    StrokeOptions {
+                                        width: 1.0,
+                                        ..Default::default()
+                                    },
+                                );
+                            },
+                            path_opts,
+                        );
+                    }
+                });
+            }
+
             evl.poll_events(|event| match event {
                 Event::WindowEvent { event, .. } => match event {
                     WindowEvent::CloseRequested | WindowEvent::Destroyed => running = false,
@@ -243,60 +315,6 @@ impl GUI {
                 _ => (),
             });
 
-            if !redraw {
-                // don't do anything if it's not moved
-                continue;
-            }
-
-            // let size = win.get_inner_size().unwrap();
-            // let (width, height) = (size.width as i32, size.height as i32);
-
-            unsafe {
-                gl::Viewport(0, 0, width as i32, height as i32);
-                gl::ClearColor(0.3, 0.3, 0.32, 1.0);
-                gl::Clear(gl::COLOR_BUFFER_BIT | gl::DEPTH_BUFFER_BIT | gl::STENCIL_BUFFER_BIT);
-            }
-
-            let (width, height) = (width as f64, height as f64);
-            ctx.frame((width as f32, height as f32), f as f32, |frame| {
-                let path_opts = PathOptions::default();
-                frame.path(
-                    |path| {
-                        path.rect((0.0, 0.0), ((width * f) as f32, (height * f) as f32));
-                        // path.fill(Color::from_rgba(200, 200, 200, 255), Default::default());
-                        path.fill(
-                            ImagePattern {
-                                image: &image,
-                                origin: (0.0, 0.0),
-                                size: (width as f32, height as f32),
-                                angle: 0.0 / 180.0 * consts::PI,
-                                alpha: 1.0,
-                            },
-                            Default::default(),
-                        )
-                    },
-                    path_opts,
-                );
-                if down && rectw.abs() > 0.0 && recth.abs() > 0.0 {
-                    frame.path(
-                        |path| {
-                            path.rect(
-                                ((dx * f) as f32, (dy * f) as f32),
-                                ((rectw * f) as f32, (recth * f) as f32),
-                            );
-                            path.stroke(
-                                Color::from_rgba(0, 0, 0, 255),
-                                StrokeOptions {
-                                    width: 2.0,
-                                    ..Default::default()
-                                },
-                            );
-                        },
-                        path_opts,
-                    );
-                }
-            });
-
             win.swap_buffers().expect("couldn't swap buffers");
         }
         if rectw.abs() > 0.0 && recth.abs() > 0.0 {

xlib/src/display.rs

@@ -10,6 +10,8 @@ pub struct Display {
     inner: *mut x::Display,
 }
 
+pub struct Grab(pub(crate) *mut x::Display);
+
 /// Something that's part of a display.
 pub trait GetDisplay {
     /// Get the current display
@@ -30,6 +32,19 @@ impl Display {
         Ok(Display { inner })
     }
 
+    /// Create a Display for an existing connection
+    pub fn from_handle(handle: u64) -> Self {
+        Display {
+            inner: handle as *mut x::Display,
+        }
+    }
+
+    /// Grab
+    pub fn grab(&self) -> Grab {
+        unsafe { x::XGrabServer(self.inner) };
+        Grab(self.inner)
+    }
+
     /// Wrapper around XCreateFontCursor
     pub fn create_font_cursor(&self, shape: u32) -> Result<Cursor, X11Error> {
         let cursor = unsafe { x::XCreateFontCursor(self.inner, shape) as x::Cursor };
@@ -152,3 +167,9 @@ impl Drop for Display {
         unsafe { x::XCloseDisplay(self.inner) };
     }
 }
+
+impl Drop for Grab {
+    fn drop(&mut self) {
+        unsafe { x::XUngrabServer(self.0) };
+    }
+}

xlib/src/lib.rs

@@ -25,7 +25,7 @@ mod cursorfont;
 pub use atom::Atom;
 pub use cursor::Cursor;
 pub use cursorfont::*;
-pub use display::{Display, GetDisplay};
+pub use display::{Display, GetDisplay, Grab};
 pub use drawable::Drawable;
 pub use errors::X11Error;
 pub use event::{Event, EventKind};