core graphics initialization problem fix and readme.md updates

README.md

@@ -1,4 +1,28 @@
-# CrabGrab
-🦀 🖥️ 🦀 
+# CrabGrab 🦀 🖥️ 🦀 
 
-## A cross-platform screen-capturing crate for rust
+A cross-platform screen-capturing crate for rust
+
+Features:
+---------
+- Screen and window capture supported
+- Compatible with multiple GPU APIs:
+    - Wgpu
+    - DirectX 11
+    - DXGI
+    - Metal
+    - IOSurface
+- Easy frame bitmap generation
+- Sound capture (wip)
+- Platform specific extension features
+- Screenshot facility
+
+Examples
+--------
+
+Examples can be found at [crabgrab/examples](examples). You can run the examples from a copy of the repository:
+
+`cargo run --example <example_name>`
+
+Note that feature examples will require that feature:
+
+`cargo run --example <example name> --feature <feature name>`

src/platform/macos/capturable_content.rs

@@ -5,7 +5,7 @@ use libc::getpid;
 
 use crate::{capturable_content::{CapturableContentFilter, CapturableContentError}, util::{Rect, Point, Size}};
 
-use super::objc_wrap::{SCDisplay, SCRunningApplication, SCShareableContent, SCWindow};
+use super::objc_wrap::{CGMainDisplayID, SCDisplay, SCRunningApplication, SCShareableContent, SCWindow};
 
 pub struct MacosCapturableContent {
     pub windows: Vec<SCWindow>,
@@ -14,6 +14,8 @@ pub struct MacosCapturableContent {
 
 impl MacosCapturableContent {
     pub async fn new(filter: CapturableContentFilter) -> Result<Self, CapturableContentError> {
+        // Force core graphics initialization
+        unsafe { CGMainDisplayID() };
         let (exclude_desktop, onscreen_only) = filter.windows.map_or((false, true), |filter| (!filter.desktop_windows, filter.onscreen_only));
         let (tx, rx) = oneshot::channel();
         let tx = Cell::new(Some(tx));