1 files changed, 94 insertions, 0 deletions
diff --git a/gfx/wr/examples/alpha_perf.rs b/gfx/wr/examples/alpha_perf.rs
new file mode 100644
index 0000000000..3d8d019de1
--- /dev/null
+++ b/gfx/wr/examples/alpha_perf.rs
@@ -0,0 +1,94 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+extern crate euclid;
+extern crate gleam;
+extern crate glutin;
+extern crate webrender;
+extern crate winit;
+
+#[path = "common/boilerplate.rs"]
+mod boilerplate;
+
+use crate::boilerplate::{Example, HandyDandyRectBuilder};
+use std::cmp;
+use webrender::api::*;
+use webrender::render_api::*;
+use webrender::api::units::DeviceIntSize;
+
+
+struct App {
+    rect_count: usize,
+}
+
+impl Example for App {
+    fn render(
+        &mut self,
+        _api: &mut RenderApi,
+        builder: &mut DisplayListBuilder,
+        _txn: &mut Transaction,
+        _device_size: DeviceIntSize,
+        pipeline_id: PipelineId,
+        _document_id: DocumentId,
+    ) {
+        let bounds = (0, 0).to(1920, 1080);
+        let space_and_clip = SpaceAndClipInfo::root_scroll(pipeline_id);
+
+        builder.push_simple_stacking_context(
+            bounds.origin,
+            space_and_clip.spatial_id,
+            PrimitiveFlags::IS_BACKFACE_VISIBLE,
+        );
+
+        for _ in 0 .. self.rect_count {
+            builder.push_rect(
+                &CommonItemProperties::new(bounds, space_and_clip),
+                bounds,
+                ColorF::new(1.0, 1.0, 1.0, 0.05)
+            );
+        }
+
+        builder.pop_stacking_context();
+    }
+
+    fn on_event(
+        &mut self,
+        event: winit::WindowEvent,
+        _api: &mut RenderApi,
+        _document_id: DocumentId
+    ) -> bool {
+        match event {
+            winit::WindowEvent::KeyboardInput {
+                input: winit::KeyboardInput {
+                    state: winit::ElementState::Pressed,
+                    virtual_keycode: Some(key),
+                    ..
+                },
+                ..
+            } => {
+                match key {
+                    winit::VirtualKeyCode::Right => {
+                        self.rect_count += 1;
+                        println!("rects = {}", self.rect_count);
+                    }
+                    winit::VirtualKeyCode::Left => {
+                        self.rect_count = cmp::max(self.rect_count, 1) - 1;
+                        println!("rects = {}", self.rect_count);
+                    }
+                    _ => {}
+                };
+            }
+            _ => (),
+        }
+
+        true
+    }
+}
+
+fn main() {
+    let mut app = App {
+        rect_count: 1,
+    };
+    boilerplate::main_wrapper(&mut app, None);
+}