From 6cb66104364f10b3e41e867015a3ca831bb8a1a1 Mon Sep 17 00:00:00 2001
From: darkgallium <darkgallium@deuxfleurs.fr>
Date: Thu, 31 Dec 2020 16:37:32 +0100
Subject: [PATCH] initial commit

---
 .gitignore  |   1 +
 Cargo.lock  | 355 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |  11 ++
 src/main.rs | 100 +++++++++++++++
 4 files changed, 467 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..000cefe
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,355 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..ef01889
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "shutter-rs"
+version = "0.1.0"
+authors = ["darkgallium <darkgallium@deuxfleurs.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+image = "0.23.12"
+x11 = { version = "2.18", features = [ "xlib", "xss" ] }
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..522c4fa
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,100 @@
+use x11::xlib::{XGrabPointer, XCreateFontCursor, XOpenDisplay, Display, XDefaultRootWindow, XAllPlanes, ZPixmap, XGetImage, ButtonMotionMask, ButtonPressMask, ButtonReleaseMask, CurrentTime, GrabModeAsync, GrabSuccess, XNextEvent, XEvent, XPending, ButtonPress, ButtonRelease, XButtonEvent, XGrabKeyboard, KeyPress, XKeyEvent};
+use std::mem::MaybeUninit;
+use image::RgbaImage;
+use std::convert::TryInto;
+
+#[derive(Debug)]
+struct Position {
+  origin_x: u32,
+  origin_y: u32,
+  height: u32,
+  width: u32,
+}
+
+fn screenshot(pos: &Position) {
+    unsafe {
+      let display: *mut Display = XOpenDisplay(std::ptr::null());
+      let root_window = XDefaultRootWindow(display);
+
+      let ximg = XGetImage(display, root_window, pos.origin_x.try_into().unwrap(), pos.origin_y.try_into().unwrap(), pos.width.try_into().unwrap(), pos.height.try_into().unwrap(), XAllPlanes(), ZPixmap);
+      let len = pos.height*pos.width*4;
+      let v = Vec::<u8>::from_raw_parts((*ximg).data as *mut _, len.try_into().unwrap(), len.try_into().unwrap());
+      //println!("{:?}", v);
+      let img = RgbaImage::from_raw(pos.width, pos.height, v).unwrap();
+
+      img.save("empty.jpg").unwrap();
+    }
+
+}
+
+// https://bbs.archlinux.org/viewtopic.php?id=85378
+fn trigger_selection() -> Option<Position> {
+
+    unsafe {
+      let display: *mut Display = XOpenDisplay(std::ptr::null());
+      let root_window = XDefaultRootWindow(display);
+      
+      let c = XCreateFontCursor(display, 130); // XC_tcross = 130
+      let button_mask = ButtonMotionMask as u32 | ButtonPressMask as u32 | ButtonReleaseMask as u32;
+ 
+      if XGrabPointer(display, root_window, 0, button_mask, GrabModeAsync, GrabModeAsync, root_window, c, CurrentTime) != GrabSuccess {
+        panic!("could not grab");
+      }
+
+      if XGrabKeyboard(display, root_window, 0, GrabModeAsync, GrabModeAsync, CurrentTime) != GrabSuccess {
+        panic!("could not grab");
+      }
+
+      let mut pos = Position { origin_x: 0, origin_y: 0, width: 0, height: 0};
+
+      'main: loop {
+        while XPending(display) > 0 {
+          let mut e: MaybeUninit<XEvent> = MaybeUninit::uninit();
+          XNextEvent(display, e.as_mut_ptr());
+
+          let event = unsafe { e.assume_init() };
+          match event.type_ {
+            KeyPress => {
+               let event = XKeyEvent::from(event);
+               if event.keycode == 9 { // escape keycode (xev)
+                  return None;
+               }
+            },
+            ButtonPress => {
+               let event = XButtonEvent::from(event);
+               println!("origin = ({},{})", event.x, event.y);
+               pos.origin_x = event.x_root.try_into().unwrap();
+               pos.origin_y = event.y_root.try_into().unwrap();
+            },
+            ButtonRelease => {
+                // assuming that the upper left corner is the origin
+                let event = XButtonEvent::from(event);
+                let x: u32 = event.x_root.try_into().unwrap();
+                let y: u32 = event.y_root.try_into().unwrap();
+
+                pos.width = x - pos.origin_x;
+                pos.height = y - pos.origin_y;
+                
+                if pos.height == 0 || pos.width == 0 {
+                  return None
+                }
+
+                return Some(pos);
+            }
+            _ => { println!("type unknown: {}", event.type_); }
+          }
+        }
+      }
+
+    }
+
+
+}
+
+fn main() {
+  let s = trigger_selection();
+  println!("{:?}", s);
+  if let Some(select) = s {
+    screenshot(&select);
+  }
+}