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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
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;
use euclid::Scale;
use webrender::api::*;
use webrender::render_api::*;
use webrender::api::units::*;
// This example creates multiple documents overlapping each other with
// specified layer indices.
struct Document {
id: DocumentId,
pipeline_id: PipelineId,
content_rect: LayoutRect,
color: ColorF,
}
struct App {
documents: Vec<Document>,
}
impl App {
fn init(
&mut self,
api: &mut RenderApi,
device_pixel_ratio: f32,
) {
let init_data = vec![
(
PipelineId(1, 0),
ColorF::new(0.0, 1.0, 0.0, 1.0),
DeviceIntPoint::new(0, 0),
),
(
PipelineId(2, 0),
ColorF::new(1.0, 1.0, 0.0, 1.0),
DeviceIntPoint::new(200, 0),
),
(
PipelineId(3, 0),
ColorF::new(1.0, 0.0, 0.0, 1.0),
DeviceIntPoint::new(200, 200),
),
(
PipelineId(4, 0),
ColorF::new(1.0, 0.0, 1.0, 1.0),
DeviceIntPoint::new(0, 200),
),
];
for (pipeline_id, color, offset) in init_data {
let size = DeviceIntSize::new(250, 250);
let bounds = DeviceIntRect::from_origin_and_size(offset, size);
let document_id = api.add_document(size);
let mut txn = Transaction::new();
txn.set_root_pipeline(pipeline_id);
api.send_transaction(document_id, txn);
self.documents.push(Document {
id: document_id,
pipeline_id,
content_rect: LayoutRect::from_size(
bounds.size().to_f32() / Scale::new(device_pixel_ratio),
),
color,
});
}
}
}
impl Example for App {
fn render(
&mut self,
api: &mut RenderApi,
_base_builder: &mut DisplayListBuilder,
_txn: &mut Transaction,
_device_size: DeviceIntSize,
_pipeline_id: PipelineId,
_: DocumentId,
) {
if self.documents.is_empty() {
// this is the first run, hack around the boilerplate,
// which assumes an example only needs one document
self.init(api, 1.0);
}
for doc in &self.documents {
let space_and_clip = SpaceAndClipInfo::root_scroll(doc.pipeline_id);
let mut builder = DisplayListBuilder::new(
doc.pipeline_id,
);
builder.begin();
let local_rect = LayoutRect::from_size(doc.content_rect.size());
builder.push_simple_stacking_context(
doc.content_rect.min,
space_and_clip.spatial_id,
PrimitiveFlags::IS_BACKFACE_VISIBLE,
);
builder.push_rect(
&CommonItemProperties::new(local_rect, space_and_clip),
local_rect,
doc.color,
);
builder.pop_stacking_context();
let mut txn = Transaction::new();
txn.set_display_list(
Epoch(0),
builder.end(),
);
txn.generate_frame(0, RenderReasons::empty());
api.send_transaction(doc.id, txn);
}
}
}
fn main() {
let mut app = App {
documents: Vec::new(),
};
boilerplate::main_wrapper(&mut app, None);
}