sl4f_lib/scenic/
facade.rs

1// Copyright 2019 The Fuchsia Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5use crate::scenic::types::ScreenshotDataDef;
6use anyhow::{Context as _, Error};
7use fidl_fuchsia_ui_composition::{self as ui_comp, ScreenshotMarker};
8use fidl_fuchsia_ui_scenic::ScreenshotData;
9use fuchsia_component::{self as app};
10use serde_json::{to_value, Value};
11
12/// Perform Scenic operations.
13///
14/// Note this object is shared among all threads created by server.
15#[derive(Debug)]
16pub struct ScenicFacade {}
17
18impl ScenicFacade {
19    pub fn new() -> ScenicFacade {
20        ScenicFacade {}
21    }
22    pub async fn take_screenshot(&self) -> Result<Value, Error> {
23        // Connect to the screenshot protocol.
24        let screenshotter = app::client::connect_to_protocol::<ScreenshotMarker>()
25            .context("Failed to connect to screenshot")?;
26
27        let gnf_args = ui_comp::ScreenshotTakeRequest {
28            format: Some(ui_comp::ScreenshotFormat::BgraRaw),
29            ..Default::default()
30        };
31
32        let screenshot_response: ui_comp::ScreenshotTakeResponse;
33        let data = screenshotter.take(gnf_args).await;
34
35        match data {
36            Err(e) => {
37                return Err(format_err!("Screenshot.Take() failed with FIDL err: {}", e));
38            }
39            Ok(val) => screenshot_response = val,
40        }
41
42        let image_vmo = screenshot_response
43            .vmo
44            .ok_or_else(|| format_err!("invalid vmo format in ScreenshotTakeResponse"))?;
45
46        let image_size = screenshot_response
47            .size
48            .ok_or_else(|| format_err!("invalid size format in ScreenshotTakeResponse"))?;
49
50        let image_info = fidl_fuchsia_images::ImageInfo {
51            transform: fidl_fuchsia_images::Transform::Normal,
52            width: image_size.width,
53            height: image_size.height,
54            stride: image_size.width * 4,
55            pixel_format: fidl_fuchsia_images::PixelFormat::Bgra8,
56            color_space: fidl_fuchsia_images::ColorSpace::Srgb,
57            tiling: fidl_fuchsia_images::Tiling::Linear,
58            alpha_format: fidl_fuchsia_images::AlphaFormat::Opaque,
59        };
60
61        let buffer = fidl_fuchsia_mem::Buffer {
62            vmo: image_vmo,
63            size: u64::from(image_size.height * image_size.width * 4),
64        };
65
66        let screenshot: ScreenshotData = ScreenshotData { info: image_info, data: buffer };
67
68        return Ok(to_value(ScreenshotDataDef::new(screenshot))?);
69    }
70}
sl4f_lib/scenic/facade.rs

sl4f_lib/scenic/
facade.rs
