1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/* 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);
}
|
