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+/* 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 gleam;
+extern crate glutin;
+extern crate webrender;
+extern crate winit;
+
+#[path = "common/boilerplate.rs"]
+mod boilerplate;
+
+use crate::boilerplate::{Example, HandyDandyRectBuilder};
+use webrender::api::*;
+use webrender::render_api::*;
+use webrender::api::units::*;
+
+// This example uses the push_iframe API to nest a second pipeline's displaylist
+// inside the root pipeline's display list. When it works, a green square is
+// shown. If it fails, a red square is shown.
+
+struct App {}
+
+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,
+ ) {
+ // All the sub_* things are for the nested pipeline
+ let sub_size = DeviceIntSize::new(100, 100);
+ let sub_bounds = (0, 0).to(sub_size.width as i32, sub_size.height as i32);
+
+ let sub_pipeline_id = PipelineId(pipeline_id.0, 42);
+ let mut sub_builder = DisplayListBuilder::new(sub_pipeline_id);
+ let mut space_and_clip = SpaceAndClipInfo::root_scroll(pipeline_id);
+ sub_builder.begin();
+
+ sub_builder.push_simple_stacking_context(
+ sub_bounds.min,
+ space_and_clip.spatial_id,
+ PrimitiveFlags::IS_BACKFACE_VISIBLE,
+ );
+
+ // green rect visible == success
+ sub_builder.push_rect(
+ &CommonItemProperties::new(sub_bounds, space_and_clip),
+ sub_bounds,
+ ColorF::new(0.0, 1.0, 0.0, 1.0)
+ );
+ sub_builder.pop_stacking_context();
+
+ let mut txn = Transaction::new();
+ txn.set_display_list(
+ Epoch(0),
+ sub_builder.end(),
+ );
+ api.send_transaction(document_id, txn);
+
+ space_and_clip.spatial_id = builder.push_reference_frame(
+ sub_bounds.min,
+ space_and_clip.spatial_id,
+ TransformStyle::Flat,
+ PropertyBinding::Binding(PropertyBindingKey::new(42), LayoutTransform::identity()),
+ ReferenceFrameKind::Transform {
+ is_2d_scale_translation: false,
+ should_snap: false,
+ paired_with_perspective: false,
+ },
+ SpatialTreeItemKey::new(0, 0),
+ );
+
+ // And this is for the root pipeline
+ builder.push_simple_stacking_context(
+ sub_bounds.min,
+ space_and_clip.spatial_id,
+ PrimitiveFlags::IS_BACKFACE_VISIBLE,
+ );
+
+ // red rect under the iframe: if this is visible, things have gone wrong
+ builder.push_rect(
+ &CommonItemProperties::new(sub_bounds, space_and_clip),
+ sub_bounds,
+ ColorF::new(1.0, 0.0, 0.0, 1.0)
+ );
+ builder.push_iframe(sub_bounds, sub_bounds, &space_and_clip, sub_pipeline_id, false);
+ builder.pop_stacking_context();
+ builder.pop_reference_frame();
+ }
+}
+
+fn main() {
+ let mut app = App {};
+ boilerplate::main_wrapper(&mut app, None);
+}