feat(web): use softbuffer to draw into the canvas (#191)

Instead of copying and sending image buffers to JavaScript, the WASM
module now draws into the canvas by itself. This removes some overhead
associated with the previous approach and open the door for further
optimizations.

In order to achieve good performance, the newest API of
`softbuffer@0.3.0` is used: the "owned buffer" that can be written into
by us with direct access and `present_with_damage` to apply partial
updates. The presentation itself is currently not yet "no-copy" in
the case of the web backend because the current API of `softbuffer` is
expecting a pixel buffer in the BGRX format while the underlying canvas
can only takes RGBA pixels. There is an open issue for this.

There was a bug with the `present_with_damage` implementation for the
web backend. I fixed the issue and opened a PR to upstream the patch.
The cargo dependency patch will be removed once the fix is published
on crates.io.

Issue: ARC-164

Cargo.toml

@@ -21,10 +21,10 @@ keywords = ["rdp", "remote-desktop", "network", "client", "protocol"]
 categories = ["network-programming"]
 
 [workspace.dependencies]
+ironrdp-acceptor = { version = "0.1", path = "crates/ironrdp-acceptor" }
 ironrdp-async = { version = "0.1", path = "crates/ironrdp-async" }
 ironrdp-cliprdr = { version = "0.1", path = "crates/ironrdp-cliprdr" }
 ironrdp-connector = { version = "0.1", path = "crates/ironrdp-connector" }
-ironrdp-acceptor = { version = "0.1", path = "crates/ironrdp-acceptor" }
 ironrdp-dvc = { version = "0.1", path = "crates/ironrdp-dvc" }
 ironrdp-error = { version = "0.1", path = "crates/ironrdp-error" }
 ironrdp-futures = { version = "0.1", path = "crates/ironrdp-futures" }
@@ -36,13 +36,13 @@ ironrdp-pdu = { version = "0.1", path = "crates/ironrdp-pdu" }
 ironrdp-rdcleanpath = { version = "0.1", path = "crates/ironrdp-rdcleanpath" }
 ironrdp-rdpdr = { version = "0.1", path = "crates/ironrdp-rdpdr" }
 ironrdp-rdpsnd = { version = "0.1", path = "crates/ironrdp-rdpsnd" }
+ironrdp-server = { version = "0.1", path = "crates/ironrdp-server" }
 ironrdp-session-generators = { path = "crates/ironrdp-session-generators" }
 ironrdp-session = { version = "0.1", path = "crates/ironrdp-session" }
 ironrdp-svc = { version = "0.1", path = "crates/ironrdp-svc" }
 ironrdp-testsuite-core = { path = "crates/ironrdp-testsuite-core" }
 ironrdp-tls = { version = "0.1", path = "crates/ironrdp-tls" }
 ironrdp-tokio = { version = "0.1", path = "crates/ironrdp-tokio" }
-ironrdp-server = { version = "0.1", path = "crates/ironrdp-server" }
 ironrdp = { version = "0.5", path = "crates/ironrdp" }
 
 expect-test = "1"
@@ -63,3 +63,6 @@ lto = true
 inherits = "release"
 opt-level = "s"
 lto = true
+
+[patch.crates-io]
+softbuffer = { git = "https://github.com/CBenoit/softbuffer.git", rev = "8a9e7f95e054f9af5752682aa5f27890aeb1b094" }

crates/ironrdp-client/Cargo.toml

@@ -33,9 +33,9 @@ ironrdp-tls.workspace = true
 ironrdp-tokio.workspace = true
 sspi = { workspace = true, features = ["network_client", "dns_resolver"] } # enable additional features
 
-# GUI
-softbuffer = "0.3"
+# Windowing and rendering
 winit = "0.28"
+softbuffer = "0.3"
 
 # CLI
 clap = { version = "4.2", features = ["derive", "cargo"] }