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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 gleam;
extern crate glutin;
extern crate webrender;
extern crate winit;
#[path = "common/boilerplate.rs"]
mod boilerplate;
#[path = "common/image_helper.rs"]
mod image_helper;
use crate::boilerplate::{Example, HandyDandyRectBuilder};
use webrender::api::*;
use webrender::render_api::*;
use webrender::api::units::*;
struct App {
image_key: ImageKey,
}
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 (image_descriptor, image_data) = image_helper::make_checkerboard(32, 32);
txn.add_image(
self.image_key,
image_descriptor,
image_data,
None,
);
let bounds = (0, 0).to(512, 512);
let space_and_clip = SpaceAndClipInfo::root_scroll(pipeline_id);
builder.push_simple_stacking_context(
bounds.min,
space_and_clip.spatial_id,
PrimitiveFlags::IS_BACKFACE_VISIBLE,
);
let image_size = LayoutSize::new(100.0, 100.0);
builder.push_image(
&CommonItemProperties::new(
LayoutRect::from_origin_and_size(LayoutPoint::new(100.0, 100.0), image_size),
space_and_clip,
),
bounds,
ImageRendering::Auto,
AlphaType::PremultipliedAlpha,
self.image_key,
ColorF::WHITE,
);
builder.push_image(
&CommonItemProperties::new(
LayoutRect::from_origin_and_size(LayoutPoint::new(250.0, 100.0), image_size),
space_and_clip,
),
bounds,
ImageRendering::Pixelated,
AlphaType::PremultipliedAlpha,
self.image_key,
ColorF::WHITE,
);
builder.pop_stacking_context();
}
fn on_event(
&mut self,
event: winit::event::WindowEvent,
_window: &winit::window::Window,
api: &mut RenderApi,
document_id: DocumentId,
) -> bool {
match event {
winit::event::WindowEvent::KeyboardInput {
input: winit::event::KeyboardInput {
state: winit::event::ElementState::Pressed,
virtual_keycode: Some(winit::event::VirtualKeyCode::Space),
..
},
..
} => {
let mut image_data = Vec::new();
for y in 0 .. 64 {
for x in 0 .. 64 {
let r = 255 * ((y & 32) == 0) as u8;
let g = 255 * ((x & 32) == 0) as u8;
image_data.extend_from_slice(&[0, g, r, 0xff]);
}
}
let mut txn = Transaction::new();
txn.update_image(
self.image_key,
ImageDescriptor::new(64, 64, ImageFormat::BGRA8, ImageDescriptorFlags::IS_OPAQUE),
ImageData::new(image_data),
&DirtyRect::All,
);
let mut txn = Transaction::new();
txn.generate_frame(0, RenderReasons::empty());
api.send_transaction(document_id, txn);
}
_ => {}
}
false
}
}
fn main() {
let mut app = App {
image_key: ImageKey(IdNamespace(0), 0),
};
boilerplate::main_wrapper(&mut app, None);
}