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Make canvas minimal render on first loop

This commit is contained in:
LeRoyce Pearson 2020-07-22 12:28:36 -06:00
parent 5951b32ede
commit 263dc0ab15
1 changed files with 41 additions and 36 deletions
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77
examples/canvas_minimal/src/main.rs
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@ -82,49 +82,54 @@ fn main() {
let mut renderer = Renderer::new(pathfinder_device, &resource_loader, mode, options);
let font_context = CanvasFontContext::from_system_source();
let mut is_first_render = true;
// Wait for a keypress.
event_loop.run_forever(|event| {
let mut should_render = is_first_render;
match event {
Event::WindowEvent { event: WindowEvent::CloseRequested, .. } |
Event::WindowEvent { event: WindowEvent::KeyboardInput { .. }, .. } => {
ControlFlow::Break
}
Event::WindowEvent { event: WindowEvent::KeyboardInput { .. }, .. } => return ControlFlow::Break,
Event::WindowEvent { event: WindowEvent::Refresh, .. } => {
// Make a canvas. We're going to draw a house.
let mut canvas = Canvas::new(framebuffer_size.to_f32()).get_context_2d(font_context.clone());
// Set line width.
canvas.set_line_width(10.0);
// Draw walls.
canvas.stroke_rect(RectF::new(vec2f(75.0, 140.0), vec2f(150.0, 110.0)));
// Draw door.
canvas.fill_rect(RectF::new(vec2f(130.0, 190.0), vec2f(40.0, 60.0)));
// Draw roof.
let mut path = Path2D::new();
path.move_to(vec2f(50.0, 140.0));
path.line_to(vec2f(150.0, 60.0));
path.line_to(vec2f(250.0, 140.0));
path.close_path();
canvas.stroke_path(path);
// Render the canvas to screen.
let mut scene = SceneProxy::from_scene(canvas.into_canvas().into_scene(),
renderer.mode().level,
RayonExecutor);
scene.build_and_render(&mut renderer, BuildOptions::default());
// Present the surface.
let mut surface = device.unbind_surface_from_context(&mut context).unwrap().unwrap();
device.present_surface(&mut context, &mut surface).unwrap();
device.bind_surface_to_context(&mut context, surface).unwrap();
ControlFlow::Continue
should_render = true;
}
_ => ControlFlow::Continue,
_ => {},
}
if should_render {
// Make a canvas. We're going to draw a house.
let mut canvas = Canvas::new(framebuffer_size.to_f32()).get_context_2d(font_context.clone());
// Set line width.
canvas.set_line_width(10.0);
// Draw walls.
canvas.stroke_rect(RectF::new(vec2f(75.0, 140.0), vec2f(150.0, 110.0)));
// Draw door.
canvas.fill_rect(RectF::new(vec2f(130.0, 190.0), vec2f(40.0, 60.0)));
// Draw roof.
let mut path = Path2D::new();
path.move_to(vec2f(50.0, 140.0));
path.line_to(vec2f(150.0, 60.0));
path.line_to(vec2f(250.0, 140.0));
path.close_path();
canvas.stroke_path(path);
// Render the canvas to screen.
let mut scene = SceneProxy::from_scene(canvas.into_canvas().into_scene(),
renderer.mode().level,
RayonExecutor);
scene.build_and_render(&mut renderer, BuildOptions::default());
// Present the surface.
let mut surface = device.unbind_surface_from_context(&mut context).unwrap().unwrap();
device.present_surface(&mut context, &mut surface).unwrap();
device.bind_surface_to_context(&mut context, surface).unwrap();
}
is_first_render = false;
ControlFlow::Continue
});
// Clean up.