wayland: implement alpha_modifier_v1

src/it/tests/t0039_alpha_modifier.rs

@@ -0,0 +1,56 @@
+use {
+    crate::{
+        it::{test_error::TestResult, testrun::TestRun},
+        theme::Color,
+    },
+    std::rc::Rc,
+};
+
+testcase!();
+
+async fn test(run: Rc<TestRun>) -> TestResult {
+    let _ds = run.create_default_setup().await?;
+
+    let client = run.create_client().await?;
+    let win = client.create_window().await?;
+    win.set_color(255, 0, 0, 255);
+    win.map2().await?;
+
+    macro_rules! create_surface {
+        ($buf:expr, $x:expr, $y:expr) => {{
+            let ss = client.comp.create_surface().await?;
+            let vp = client.viewporter.get_viewport(&ss)?;
+            vp.set_destination(100, 100)?;
+            ss.attach($buf.id)?;
+            ss.commit()?;
+            let alpha = client
+                .registry
+                .get_alpha_modifier()
+                .await?
+                .get_surface(&ss)?;
+            let sub = client.sub.get_subsurface(ss.id, win.surface.id).await?;
+            sub.set_desync()?;
+            sub.set_position($x, $y)?;
+            win.surface.commit()?;
+            (ss, alpha)
+        }};
+    }
+
+    let buf1 = client.spbm.create_buffer(Color::from_rgb(0, 255, 0))?;
+    let (ss1, alpha1) = create_surface!(&buf1, 0, 0);
+
+    let buf2 = client.shm.create_buffer(1, 1)?;
+    buf2.fill(Color::from_rgb(0, 255, 0));
+    let (ss2, alpha2) = create_surface!(&buf2.buffer, 100, 0);
+
+    client.compare_screenshot("1", false).await?;
+
+    alpha1.set_multiplier(0.5)?;
+    ss1.commit()?;
+    alpha2.set_multiplier(0.5)?;
+    ss2.commit()?;
+
+    client.compare_screenshot("2", false).await?;
+
+    Ok(())
+}