зеркало из https://github.com/mozilla/gecko-dev.git
324 строки
10 KiB
Rust
324 строки
10 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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extern crate gleam;
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extern crate glutin;
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extern crate webrender;
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extern crate winit;
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#[path = "common/boilerplate.rs"]
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mod boilerplate;
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use crate::boilerplate::{Example, HandyDandyRectBuilder};
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use gleam::gl;
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use std::mem;
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use webrender::api::*;
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use webrender::api::units::*;
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struct ImageGenerator {
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patterns: [[u8; 3]; 6],
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next_pattern: usize,
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current_image: Vec<u8>,
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}
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impl ImageGenerator {
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fn new() -> Self {
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ImageGenerator {
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next_pattern: 0,
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patterns: [
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[1, 0, 0],
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[0, 1, 0],
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[0, 0, 1],
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[1, 1, 0],
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[0, 1, 1],
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[1, 0, 1],
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],
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current_image: Vec::new(),
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}
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}
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fn generate_image(&mut self, size: i32) {
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let pattern = &self.patterns[self.next_pattern];
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self.current_image.clear();
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for y in 0 .. size {
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for x in 0 .. size {
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let lum = 255 * (1 - (((x & 8) == 0) ^ ((y & 8) == 0)) as u8);
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self.current_image.extend_from_slice(&[
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lum * pattern[0],
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lum * pattern[1],
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lum * pattern[2],
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0xff,
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]);
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}
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}
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self.next_pattern = (self.next_pattern + 1) % self.patterns.len();
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}
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fn take(&mut self) -> Vec<u8> {
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mem::replace(&mut self.current_image, Vec::new())
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}
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}
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impl webrender::ExternalImageHandler for ImageGenerator {
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fn lock(
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&mut self,
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_key: ExternalImageId,
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channel_index: u8,
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_rendering: ImageRendering
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) -> webrender::ExternalImage {
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self.generate_image(channel_index as i32);
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webrender::ExternalImage {
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uv: TexelRect::new(0.0, 0.0, 1.0, 1.0),
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source: webrender::ExternalImageSource::RawData(&self.current_image),
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}
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}
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fn unlock(&mut self, _key: ExternalImageId, _channel_index: u8) {}
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}
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struct App {
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stress_keys: Vec<ImageKey>,
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image_key: Option<ImageKey>,
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image_generator: ImageGenerator,
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swap_keys: Vec<ImageKey>,
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swap_index: usize,
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}
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impl Example for App {
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fn render(
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&mut self,
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api: &RenderApi,
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builder: &mut DisplayListBuilder,
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txn: &mut Transaction,
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_device_size: DeviceIntSize,
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pipeline_id: PipelineId,
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_document_id: DocumentId,
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) {
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let bounds = (0, 0).to(512, 512);
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let space_and_clip = SpaceAndClipInfo::root_scroll(pipeline_id);
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builder.push_simple_stacking_context(
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bounds.origin,
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space_and_clip.spatial_id,
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true,
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);
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let x0 = 50.0;
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let y0 = 50.0;
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let image_size = LayoutSize::new(4.0, 4.0);
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if self.swap_keys.is_empty() {
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let key0 = api.generate_image_key();
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let key1 = api.generate_image_key();
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self.image_generator.generate_image(128);
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txn.add_image(
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key0,
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ImageDescriptor::new(128, 128, ImageFormat::BGRA8, true, false),
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ImageData::new(self.image_generator.take()),
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None,
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);
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self.image_generator.generate_image(128);
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txn.add_image(
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key1,
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ImageDescriptor::new(128, 128, ImageFormat::BGRA8, true, false),
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ImageData::new(self.image_generator.take()),
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None,
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);
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self.swap_keys.push(key0);
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self.swap_keys.push(key1);
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}
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for (i, key) in self.stress_keys.iter().enumerate() {
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let x = (i % 128) as f32;
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let y = (i / 128) as f32;
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let info = CommonItemProperties::new(
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LayoutRect::new(
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LayoutPoint::new(x0 + image_size.width * x, y0 + image_size.height * y),
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image_size,
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),
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space_and_clip,
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);
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builder.push_image(
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&info,
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bounds,
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image_size,
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LayoutSize::zero(),
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ImageRendering::Auto,
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AlphaType::PremultipliedAlpha,
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*key,
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ColorF::WHITE,
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);
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}
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if let Some(image_key) = self.image_key {
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let image_size = LayoutSize::new(100.0, 100.0);
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let info = CommonItemProperties::new(
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LayoutRect::new(LayoutPoint::new(100.0, 100.0), image_size),
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space_and_clip,
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);
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builder.push_image(
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&info,
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bounds,
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image_size,
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LayoutSize::zero(),
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ImageRendering::Auto,
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AlphaType::PremultipliedAlpha,
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image_key,
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ColorF::WHITE,
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);
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}
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let swap_key = self.swap_keys[self.swap_index];
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let image_size = LayoutSize::new(64.0, 64.0);
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let info = CommonItemProperties::new(
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LayoutRect::new(LayoutPoint::new(100.0, 400.0), image_size),
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space_and_clip,
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);
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builder.push_image(
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&info,
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bounds,
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image_size,
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LayoutSize::zero(),
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ImageRendering::Auto,
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AlphaType::PremultipliedAlpha,
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swap_key,
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ColorF::WHITE,
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);
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self.swap_index = 1 - self.swap_index;
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builder.pop_stacking_context();
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}
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fn on_event(
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&mut self,
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event: winit::WindowEvent,
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api: &RenderApi,
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_document_id: DocumentId,
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) -> bool {
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match event {
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winit::WindowEvent::KeyboardInput {
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input: winit::KeyboardInput {
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state: winit::ElementState::Pressed,
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virtual_keycode: Some(key),
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..
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},
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..
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} => {
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let mut txn = Transaction::new();
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match key {
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winit::VirtualKeyCode::S => {
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self.stress_keys.clear();
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for _ in 0 .. 16 {
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for _ in 0 .. 16 {
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let size = 4;
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let image_key = api.generate_image_key();
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self.image_generator.generate_image(size);
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txn.add_image(
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image_key,
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ImageDescriptor::new(size, size, ImageFormat::BGRA8, true, false),
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ImageData::new(self.image_generator.take()),
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None,
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);
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self.stress_keys.push(image_key);
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}
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}
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}
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winit::VirtualKeyCode::D => if let Some(image_key) = self.image_key.take() {
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txn.delete_image(image_key);
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},
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winit::VirtualKeyCode::U => if let Some(image_key) = self.image_key {
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let size = 128;
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self.image_generator.generate_image(size);
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txn.update_image(
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image_key,
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ImageDescriptor::new(size, size, ImageFormat::BGRA8, true, false),
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ImageData::new(self.image_generator.take()),
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&DirtyRect::All,
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);
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},
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winit::VirtualKeyCode::E => {
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if let Some(image_key) = self.image_key.take() {
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txn.delete_image(image_key);
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}
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let size = 32;
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let image_key = api.generate_image_key();
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let image_data = ExternalImageData {
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id: ExternalImageId(0),
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channel_index: size as u8,
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image_type: ExternalImageType::Buffer,
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};
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txn.add_image(
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image_key,
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ImageDescriptor::new(size, size, ImageFormat::BGRA8, true, false),
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ImageData::External(image_data),
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None,
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);
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self.image_key = Some(image_key);
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}
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winit::VirtualKeyCode::R => {
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if let Some(image_key) = self.image_key.take() {
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txn.delete_image(image_key);
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}
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let image_key = api.generate_image_key();
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let size = 32;
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self.image_generator.generate_image(size);
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txn.add_image(
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image_key,
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ImageDescriptor::new(size, size, ImageFormat::BGRA8, true, false),
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ImageData::new(self.image_generator.take()),
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None,
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);
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self.image_key = Some(image_key);
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}
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_ => {}
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}
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api.update_resources(txn.resource_updates);
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return true;
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}
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_ => {}
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}
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false
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}
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fn get_image_handlers(
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&mut self,
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_gl: &dyn gl::Gl,
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) -> (Option<Box<dyn webrender::ExternalImageHandler>>,
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Option<Box<dyn webrender::OutputImageHandler>>) {
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(Some(Box::new(ImageGenerator::new())), None)
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}
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}
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fn main() {
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let mut app = App {
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image_key: None,
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stress_keys: Vec::new(),
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image_generator: ImageGenerator::new(),
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swap_keys: Vec::new(),
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swap_index: 0,
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};
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boilerplate::main_wrapper(&mut app, None);
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}
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