it: use single-pixel buffer instead of shm

src/it/test_ifs/test_single_pixel_buffer_manager.rs

@@ -0,0 +1,44 @@
+use {
+    crate::{
+        it::{
+            test_error::TestResult, test_ifs::test_buffer::TestBuffer, test_object::TestObject,
+            test_transport::TestTransport,
+        },
+        theme::Color,
+        wire::{wp_single_pixel_buffer_manager_v1::*, WpSinglePixelBufferManagerV1Id},
+    },
+    std::{cell::Cell, rc::Rc},
+};
+
+pub struct TestSinglePixelBufferManager {
+    pub id: WpSinglePixelBufferManagerV1Id,
+    pub tran: Rc<TestTransport>,
+}
+
+impl TestSinglePixelBufferManager {
+    pub fn create_buffer(&self, color: Color) -> TestResult<Rc<TestBuffer>> {
+        let obj = Rc::new(TestBuffer {
+            id: self.tran.id(),
+            tran: self.tran.clone(),
+            released: Cell::new(true),
+            destroyed: Cell::new(false),
+        });
+        let map = |c: f32| (c as f64 * u32::MAX as f64) as u32;
+        self.tran.send(CreateU32RgbaBuffer {
+            self_id: self.id,
+            id: obj.id,
+            r: map(color.r),
+            g: map(color.g),
+            b: map(color.b),
+            a: map(color.a),
+        })?;
+        self.tran.add_obj(obj.clone())?;
+        Ok(obj)
+    }
+}
+
+test_object! {
+    TestSinglePixelBufferManager, WpSinglePixelBufferManagerV1;
+}
+
+impl TestObject for TestSinglePixelBufferManager {}