1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

use {
    crate::buffer::Buffer,
    crate::client::Client,
    crate::object::{NewObjectExt, ObjectRef, RequestReceiver},
    anyhow::Error,
    fidl_fuchsia_math::Size,
    fidl_fuchsia_ui_composition as composition, fuchsia_wayland_core as wl, fuchsia_zircon as zx,
    fuchsia_zircon::{EventPair, Handle, HandleBased},
    std::rc::Rc,
    zwp_linux_dmabuf_v1_server_protocol::{
        ZwpLinuxBufferParamsV1, ZwpLinuxBufferParamsV1Request, ZwpLinuxDmabufV1,
        ZwpLinuxDmabufV1Event, ZwpLinuxDmabufV1Request,
    },
};

const DRM_FORMAT_ARGB8888: u32 = 0x34325241;
const DRM_FORMAT_ABGR8888: u32 = 0x34324241;
const DRM_FORMAT_XRGB8888: u32 = 0x34325258;
const DRM_FORMAT_XBGR8888: u32 = 0x34324258;

const DRM_FORMAT_MOD_LINEAR: u64 = 0;

/// The set of pixel formats that will be announced to clients.
const SUPPORTED_PIXEL_FORMATS: &[(u32, bool)] = &[
    (DRM_FORMAT_ARGB8888, true),
    (DRM_FORMAT_ABGR8888, true),
    (DRM_FORMAT_XRGB8888, false),
    (DRM_FORMAT_XBGR8888, false),
];

/// The set of modifiers that will be announced to clients.
#[cfg(feature = "i915")]
const SUPPORTED_MODIFIERS: &[u64] = &[
    DRM_FORMAT_MOD_LINEAR,
    1 << 56 | 1, // I915_FORMAT_MOD_X_TILED
    1 << 56 | 2, // I915_FORMAT_MOD_Y_TILED
];
#[cfg(not(feature = "i915"))]
const SUPPORTED_MODIFIERS: &[u64] = &[DRM_FORMAT_MOD_LINEAR];

/// The zwp_linux_dmabuf_v1 global.
pub struct LinuxDmabuf {
    client_version: u32,
}

impl LinuxDmabuf {
    /// Creates a new `LinuxDmabuf`.
    pub fn new(client_version: u32) -> Self {
        Self { client_version }
    }

    /// Posts events back to the client for each supported pixel format.
    pub fn post_formats(&self, this: wl::ObjectId, client: &Client) -> Result<(), Error> {
        for (format, _) in SUPPORTED_PIXEL_FORMATS.iter() {
            client.event_queue().post(this, ZwpLinuxDmabufV1Event::Format { format: *format })?;
            if self.client_version >= 3 {
                for modifier in SUPPORTED_MODIFIERS.iter() {
                    client.event_queue().post(
                        this,
                        ZwpLinuxDmabufV1Event::Modifier {
                            format: *format,
                            modifier_hi: (modifier >> 32) as u32,
                            modifier_lo: (modifier & 0xffffffff) as u32,
                        },
                    )?;
                }
            }
        }
        Ok(())
    }
}

impl RequestReceiver<ZwpLinuxDmabufV1> for LinuxDmabuf {
    fn receive(
        this: ObjectRef<Self>,
        request: ZwpLinuxDmabufV1Request,
        client: &mut Client,
    ) -> Result<(), Error> {
        match request {
            ZwpLinuxDmabufV1Request::Destroy => {
                client.delete_id(this.id())?;
            }
            ZwpLinuxDmabufV1Request::CreateParams { params_id } => {
                params_id.implement(client, LinuxBufferParams::new())?;
            }
        }
        Ok(())
    }
}

pub struct LinuxBufferParams {
    /// The token sent from the client.
    token: EventPair,
}

impl LinuxBufferParams {
    /// Creates a new `LinuxDmabufParams`.
    pub fn new() -> Self {
        LinuxBufferParams { token: Handle::invalid().into() }
    }

    /// Creates a new wl_buffer object backed by memory from params.
    pub fn create(&mut self, width: i32, height: i32, format: u32) -> Result<Buffer, Error> {
        let image_size = Size { width, height };
        let has_alpha = SUPPORTED_PIXEL_FORMATS
            .iter()
            .find_map(
                |&(supported_format, has_alpha)| {
                    if supported_format == format {
                        Some(has_alpha)
                    } else {
                        None
                    }
                },
            )
            .unwrap_or(false);
        let raw_import_token = self.token.duplicate_handle(zx::Rights::SAME_RIGHTS)?;
        let import_token = composition::BufferCollectionImportToken { value: raw_import_token };

        Ok(Buffer::from_import_token(Rc::new(import_token), image_size, has_alpha))
    }

    pub fn set_plane(&mut self, token: EventPair) {
        self.token = token;
    }
}

impl RequestReceiver<ZwpLinuxBufferParamsV1> for LinuxBufferParams {
    fn receive(
        this: ObjectRef<Self>,
        request: ZwpLinuxBufferParamsV1Request,
        client: &mut Client,
    ) -> Result<(), Error> {
        match request {
            ZwpLinuxBufferParamsV1Request::Destroy => {
                client.delete_id(this.id())?;
            }
            ZwpLinuxBufferParamsV1Request::Add { fd, .. } => {
                this.get_mut(client)?.set_plane(fd.into());
            }
            ZwpLinuxBufferParamsV1Request::Create { .. } => {}
            ZwpLinuxBufferParamsV1Request::CreateImmed {
                buffer_id, width, height, format, ..
            } => {
                let buffer = this.get_mut(client)?.create(width, height, format)?;
                buffer_id.implement(client, buffer)?;
            }
        }
        Ok(())
    }
}