pref: 截图改用自定义协议传递。

src-tauri/Cargo.lock

@@ -2653,12 +2653,14 @@ dependencies = [
  "env_logger",
  "log",
  "paris",
+ "percent-encoding",
  "png",
  "serde",
  "serde_json",
  "tauri",
  "tauri-build",
  "tokio",
+ "url-build-parse",
  "webp",
 ]
 
@@ -2913,6 +2915,21 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "url-build-parse"
+version = "9.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "434debbcbb26557225df912efe7949c6d1237defa81ae14d05a9cd8b7ffa2776"
+dependencies = [
+ "url-search-params",
+]
+
+[[package]]
+name = "url-search-params"
+version = "9.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e84890540c25e90ae611bfbab7d8bfcd138f29af6495027478945c1427abf532"
+
 [[package]]
 name = "utf-8"
 version = "0.7.6"

src-tauri/Cargo.toml

@@ -26,6 +26,8 @@ tokio = {version = "1.26.0", features = ["full"] }
 paris = { version = "1.5", features = ["timestamps", "macros"] }
 log = "0.4.17"
 env_logger = "0.10.0"
+percent-encoding = "2.2.0"
+url-build-parse = "9.0.0"
 
 [features]
 # this feature is used for production builds or when `devPath` points to the filesystem

src-tauri/src/main.rs

@@ -9,10 +9,11 @@ use core_graphics::display::{
     kCGNullWindowID, kCGWindowImageDefault, kCGWindowListOptionOnScreenOnly, CGDisplay,
 };
 use display_info::DisplayInfo;
-use paris::error;
+use paris::{error, info};
 use screenshot_manager::ScreenshotManager;
 use serde::{Deserialize, Serialize};
 use serde_json::to_string;
+use tauri::{http::ResponseBuilder, regex};
 
 #[derive(Serialize, Deserialize)]
 #[serde(remote = "DisplayInfo")]
@@ -165,6 +166,122 @@ async fn main() {
             list_display_info,
             subscribe_encoded_screenshot_updated
         ])
+        .register_uri_scheme_protocol("ambient-light", move |_app, request| {
+            info!("request: {:?}", request.uri());
+            // prepare our response
+            let response = ResponseBuilder::new().header("Access-Control-Allow-Origin", "*");
+            // get the file path
+            let uri = request.uri();
+
+            let uri = percent_encoding::percent_decode_str(uri)
+                .decode_utf8()
+                .unwrap()
+                .to_string();
+
+            let url = url_build_parse::parse_url(uri.as_str());
+
+            if let Err(err) = url {
+                error!("url parse error: {}", err);
+                return response
+                    .status(500)
+                    .mimetype("text/plain")
+                    .body("Parse uri failed.".as_bytes().to_vec());
+            }
+
+            let url = url.unwrap();
+
+            let re = regex::Regex::new(r"^/displays/(\d+)$").unwrap();
+            let path = url.path;
+            let captures = re.captures(path.as_str());
+
+            if let None = captures {
+                error!("path not matched: {:?}", path);
+                return response
+                    .status(404)
+                    .mimetype("text/plain")
+                    .body("Path Not Found.".as_bytes().to_vec());
+            }
+
+            let captures = captures.unwrap();
+
+            let display_id = captures[1].parse::<u32>().unwrap();
+
+            let bytes = tokio::task::block_in_place(move || {
+                tauri::async_runtime::block_on(async move {
+                    let screenshot_manager = ScreenshotManager::global().await;
+                    let channels = screenshot_manager.channels.read().await;
+                    if let Some(rx) = channels.get(&display_id) {
+                        let rx = rx.clone();
+                        let screenshot = rx.borrow().clone();
+                        let bytes = screenshot.bytes.read().await;
+
+                        let (scale_factor, width, height) = if url.query.is_some()
+                            && url.query.as_ref().unwrap().contains_key("height")
+                            && url.query.as_ref().unwrap().contains_key("width")
+                        {
+                            let width =
+                                url.query.as_ref().unwrap()["width"].parse::<u32>().unwrap();
+                            let height = url.query.as_ref().unwrap()["height"]
+                                .parse::<u32>()
+                                .unwrap();
+                            (screenshot.width as f32 / width as f32, width, height)
+                        } else {
+                            info!("scale by scale_factor");
+                            let scale_factor = screenshot.scale_factor;
+                            (
+                                scale_factor,
+                                (screenshot.width as f32 / scale_factor) as u32,
+                                (screenshot.height as f32 / scale_factor) as u32,
+                            )
+                        };
+                        info!(
+                            "scale by query. width: {}, height: {}, scale_factor: {}, len: {}",
+                            width,
+                            height,
+                            screenshot.width as f32 / width as f32,
+                            width * height * 4,
+                        );
+
+                        let bytes_per_row = screenshot.bytes_per_row as f32;
+
+                        let mut rgba_buffer = vec![0u8; (width * height * 4) as usize];
+
+                        for y in 0..height {
+                            for x in 0..width {
+                                let offset = ((y as f32) * scale_factor) as usize * bytes_per_row as usize
+                                    + ((x as f32) * scale_factor) as usize * 4;
+                                let b = bytes[offset];
+                                let g = bytes[offset + 1];
+                                let r = bytes[offset + 2];
+                                let a = bytes[offset + 3];
+                                let offset_2 = (y * width + x) as usize * 4;
+                                rgba_buffer[offset_2] = r;
+                                rgba_buffer[offset_2 + 1] = g;
+                                rgba_buffer[offset_2 + 2] = b;
+                                rgba_buffer[offset_2 + 3] = a;
+                            }
+                        }
+
+                        Ok(rgba_buffer.clone())
+                    } else {
+                        anyhow::bail!("Display#{}: not found", display_id);
+                    }
+                })
+            });
+
+            if let Ok(bytes) = bytes {
+                return response
+                    .mimetype("octet/stream")
+                    .status(200)
+                    .body(bytes.to_vec());
+            }
+            let err = bytes.unwrap_err();
+            error!("request screenshot bin data failed: {}", err);
+            return response
+                .mimetype("text/plain")
+                .status(500)
+                .body(err.to_string().into_bytes());
+        })
         .run(tauri::generate_context!())
         .expect("error while running tauri application");
 }

src-tauri/src/screenshot_manager.rs

@@ -44,7 +44,7 @@ pub fn take_screenshot(display_id: u32, scale_factor: f32) -> anyhow::Result<Scr
 }
 
 pub struct ScreenshotManager {
-    channels: Arc<RwLock<HashMap<u32, watch::Receiver<Screenshot>>>>,
+    pub channels: Arc<RwLock<HashMap<u32, watch::Receiver<Screenshot>>>>,
     encode_listeners: Arc<RwLock<HashMap<u32, Vec<Window>>>>,
 }