64 lines
2.5 KiB
Zig
64 lines
2.5 KiB
Zig
//! system/services/display-demo — a hardware-free client of the display service, the
|
|
//! `input-source` analog for the compositor. It creates a wallpaper and a rectangle it
|
|
//! slides each frame, then drives the compositor in a present loop — proof that a
|
|
//! *separate process* can compose a moving scene through the display service over IPC,
|
|
//! exercising the layer client API and damage-driven present end to end
|
|
//! (docs/display.md). It logs `display-demo: ok` once it has driven a run of frames.
|
|
//!
|
|
//! It draws no cursor and reads no input: the on-screen cursor is the display service's
|
|
//! own, tracked by the service's mouse-listener thread (docs/display.md). The demo's job
|
|
//! is only to prove client-driven animation, so its loop runs on its own frame timer and
|
|
//! is deliberately independent of the mouse.
|
|
|
|
const runtime = @import("runtime");
|
|
const display = runtime.display;
|
|
const system = runtime.system;
|
|
const time = runtime.time;
|
|
|
|
pub fn main() void {
|
|
const mode = display.info() orelse {
|
|
_ = system.write("display-demo: no display service\n");
|
|
return;
|
|
};
|
|
|
|
// A full-screen wallpaper under everything.
|
|
const wallpaper = display.createLayer(0, 0, mode.width, mode.height, 0) orelse return createFailed();
|
|
_ = wallpaper.fill(0, 0, mode.width, mode.height, display.color(0x10, 0x18, 0x28));
|
|
|
|
// A rectangle that slides back and forth.
|
|
const box_w: u32 = 140;
|
|
const box_h: u32 = 100;
|
|
const box_y: i32 = 200;
|
|
const box = display.createLayer(0, box_y, box_w, box_h, 1) orelse return createFailed();
|
|
_ = box.fill(0, 0, box_w, box_h, display.color(0xE0, 0x60, 0x40));
|
|
|
|
_ = display.present();
|
|
_ = system.write("display-demo: scene up; animating\n");
|
|
|
|
const span: i32 = @as(i32, @intCast(mode.width)) - @as(i32, @intCast(box_w));
|
|
var x: i32 = 0;
|
|
var dx: i32 = 8;
|
|
var frame: u32 = 0;
|
|
|
|
while (true) : (frame += 1) {
|
|
x += dx;
|
|
if (x <= 0) {
|
|
x = 0;
|
|
dx = -dx;
|
|
} else if (x >= span) {
|
|
x = span;
|
|
dx = -dx;
|
|
}
|
|
_ = box.configure(x, box_y, 1, true); // move it; the compositor repaints old + new
|
|
_ = display.present();
|
|
// A run of frames drawn through the compositor is the automated proof (the visible
|
|
// motion is a screenshot away via `zig build run-x86-64`).
|
|
if (frame == 20) _ = system.write("display-demo: ok\n");
|
|
time.sleep(time.Duration.fromMillis(30));
|
|
}
|
|
}
|
|
|
|
fn createFailed() void {
|
|
_ = system.write("display-demo: create failed\n");
|
|
}
|