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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
use crate::result::*;
use crate::ipc::sf;
use crate::gpu::parcel;
use crate::service::dispdrv;
use super::*;

pub mod rc;

pub const INTERFACE_TOKEN: &str = "android.gui.IGraphicBufferProducer";

#[derive(Copy, Clone, PartialEq, Eq, Debug, Default)]
#[repr(i32)]
pub enum ErrorCode {
    #[default]
    Success = 0,
    PermissionDenied = -1,
    NameNotFound = -2,
    WouldBlock = -11,
    NoMemory = -12,
    AlreadyExists = -17,
    NoInit = -19,
    BadValue = -22,
    DeadObject = -32,
    InvalidOperation = -38,
    NotEnoughData = -61,
    UnknownTransaction = -74,
    BadIndex = -75,
    TimeOut = -110,
    FdsNotAllowed = -2147483641,
    FailedTransaction = -2147483646,
    BadType = -2147483647,
}

#[allow(unreachable_patterns)]
pub fn convert_nv_error_code(err: ErrorCode) -> Result<()> {
    match err {
        ErrorCode::Success => Ok(()),
        ErrorCode::PermissionDenied => rc::ResultErrorCodePermissionDenied::make_err(),
        ErrorCode::NameNotFound => rc::ResultErrorCodeNameNotFound::make_err(),
        ErrorCode::WouldBlock => rc::ResultErrorCodeWouldBlock::make_err(),
        ErrorCode::NoMemory => rc::ResultErrorCodeNoMemory::make_err(),
        ErrorCode::AlreadyExists => rc::ResultErrorCodeAlreadyExists::make_err(),
        ErrorCode::NoInit => rc::ResultErrorCodeNoInit::make_err(),
        ErrorCode::BadValue => rc::ResultErrorCodeBadValue::make_err(),
        ErrorCode::DeadObject => rc::ResultErrorCodeDeadObject::make_err(),
        ErrorCode::InvalidOperation => rc::ResultErrorCodeInvalidOperation::make_err(),
        ErrorCode::NotEnoughData => rc::ResultErrorCodeNotEnoughData::make_err(),
        ErrorCode::UnknownTransaction => rc::ResultErrorCodeUnknownTransaction::make_err(),
        ErrorCode::BadIndex => rc::ResultErrorCodeBadIndex::make_err(),
        ErrorCode::TimeOut => rc::ResultErrorCodeTimeOut::make_err(),
        ErrorCode::FdsNotAllowed => rc::ResultErrorCodeFdsNotAllowed::make_err(),
        ErrorCode::FailedTransaction => rc::ResultErrorCodeFailedTransaction::make_err(),
        ErrorCode::BadType => rc::ResultErrorCodeBadType::make_err(),
        _ => rc::ResultErrorCodeInvalid::make_err(),
    }
}

pub struct Binder {
    handle: dispdrv::BinderHandle,
    hos_binder_driver: mem::Shared<dyn dispdrv::IHOSBinderDriver>,
}

impl Binder {
    pub fn new(handle: dispdrv::BinderHandle, hos_binder_driver: mem::Shared<dyn dispdrv::IHOSBinderDriver>) -> Result<Self> {
        Ok(Self { handle, hos_binder_driver })
    }

    fn transact_parcel_begin(&self, parcel: &mut parcel::Parcel) -> Result<()> {
        parcel.write_interface_token(INTERFACE_TOKEN)
    }

    fn transact_parcel_check_err(&mut self, parcel: &mut parcel::Parcel) -> Result<()> {
        let err: ErrorCode = parcel.read()?;
        convert_nv_error_code(err)?;
        Ok(())
    }

    fn transact_parcel_impl(&mut self, transaction_id: dispdrv::ParcelTransactionId, payload: parcel::ParcelPayload) -> Result<parcel::Parcel> {
        let response_payload = parcel::ParcelPayload::new();
        self.hos_binder_driver.get().transact_parcel(self.handle, transaction_id, 0, sf::Buffer::from_other_var(&payload), sf::Buffer::from_other_var(&response_payload))?;
        
        let mut parcel = parcel::Parcel::new();
        parcel.load_from(response_payload);
        Ok(parcel)
    }

    fn transact_parcel(&mut self, transaction_id: dispdrv::ParcelTransactionId, parcel: &mut parcel::Parcel) -> Result<parcel::Parcel> {
        let (payload, _payload_size) = parcel.end_write()?;
        self.transact_parcel_impl(transaction_id, payload)
    }

    pub fn get_handle(&self) -> i32 {
        self.handle
    }

    pub fn get_hos_binder_driver(&mut self) -> mem::Shared<dyn dispdrv::IHOSBinderDriver> {
        self.hos_binder_driver.clone()
    }

    pub fn increase_refcounts(&mut self) -> Result<()> {
        self.hos_binder_driver.get().adjust_refcount(self.handle, 1, dispdrv::RefcountType::Weak)?;
        self.hos_binder_driver.get().adjust_refcount(self.handle, 1, dispdrv::RefcountType::Strong)
    }

    pub fn decrease_refcounts(&mut self) -> Result<()> {
        self.hos_binder_driver.get().adjust_refcount(self.handle, -1, dispdrv::RefcountType::Weak)?;
        self.hos_binder_driver.get().adjust_refcount(self.handle, -1, dispdrv::RefcountType::Strong)
    }

    pub fn connect(&mut self, api: ConnectionApi, producer_controlled_by_app: bool) -> Result<QueueBufferOutput> {
        let mut parcel = parcel::Parcel::new();
        self.transact_parcel_begin(&mut parcel)?;

        let producer_listener: u32 = 0;
        parcel.write(producer_listener)?;
        parcel.write(api)?;
        parcel.write(producer_controlled_by_app as u32)?;

        let mut response_parcel = self.transact_parcel(dispdrv::ParcelTransactionId::Connect, &mut parcel)?;
        let qbo: QueueBufferOutput = response_parcel.read()?;

        self.transact_parcel_check_err(&mut response_parcel)?;
        Ok(qbo)
    }

    pub fn disconnect(&mut self, api: ConnectionApi, mode: DisconnectMode) -> Result<()> {
        let mut parcel = parcel::Parcel::new();
        self.transact_parcel_begin(&mut parcel)?;

        parcel.write(api)?;
        parcel.write(mode)?;

        let mut response_parcel = self.transact_parcel(dispdrv::ParcelTransactionId::Disconnect, &mut parcel)?;

        self.transact_parcel_check_err(&mut response_parcel)?;
        Ok(())
    }

    pub fn set_preallocated_buffer(&mut self, slot: i32, buf: GraphicBuffer) -> Result<()> {
        let mut parcel = parcel::Parcel::new();
        self.transact_parcel_begin(&mut parcel)?;

        parcel.write(slot)?;
        let has_input = true;
        parcel.write(has_input as u32)?;
        if has_input {
            parcel.write_sized(buf)?;
        }

        self.transact_parcel(dispdrv::ParcelTransactionId::SetPreallocatedBuffer, &mut parcel)?;
        Ok(())
    }
    
    pub fn request_buffer(&mut self, slot: i32) -> Result<(bool, GraphicBuffer)> {
        let mut parcel = parcel::Parcel::new();
        self.transact_parcel_begin(&mut parcel)?;

        parcel.write(slot)?;

        let mut response_parcel = self.transact_parcel(dispdrv::ParcelTransactionId::RequestBuffer, &mut parcel)?;
        let non_null_v: u32 = response_parcel.read()?;
        let non_null = non_null_v != 0;
        let mut gfx_buf: GraphicBuffer = Default::default();
        if non_null {
            gfx_buf = response_parcel.read_sized()?;
        }

        self.transact_parcel_check_err(&mut response_parcel)?;
        Ok((non_null, gfx_buf))
    }

    pub fn dequeue_buffer(&mut self, is_async: bool, width: u32, height: u32, get_frame_timestamps: bool, usage: GraphicsAllocatorUsage) -> Result<(i32, bool, MultiFence)> {
        let mut parcel = parcel::Parcel::new();
        self.transact_parcel_begin(&mut parcel)?;

        parcel.write(is_async as u32)?;
        parcel.write(width)?;
        parcel.write(height)?;
        parcel.write(get_frame_timestamps as u32)?;
        parcel.write(usage)?;

        let mut response_parcel = self.transact_parcel(dispdrv::ParcelTransactionId::DequeueBuffer, &mut parcel)?;

        let slot: i32 = response_parcel.read()?;
        let has_fences_v: u32 = response_parcel.read()?;
        let has_fences = has_fences_v != 0;
        let mut fences: MultiFence = Default::default();
        if has_fences {
            fences = response_parcel.read_sized()?;
        }

        self.transact_parcel_check_err(&mut response_parcel)?;
        Ok((slot, has_fences, fences))
    }

    pub fn queue_buffer(&mut self, slot: i32, qbi: QueueBufferInput) -> Result<QueueBufferOutput> {
        let mut parcel = parcel::Parcel::new();
        self.transact_parcel_begin(&mut parcel)?;

        parcel.write(slot)?;
        parcel.write_sized(qbi)?;

        let mut response_parcel = self.transact_parcel(dispdrv::ParcelTransactionId::QueueBuffer, &mut parcel)?;

        let qbo = response_parcel.read()?;

        self.transact_parcel_check_err(&mut response_parcel)?;
        Ok(qbo)
    }

    pub fn get_native_handle(&mut self, handle_type: dispdrv::NativeHandleType) -> Result<sf::CopyHandle> {
        self.hos_binder_driver.get().get_native_handle(self.handle, handle_type)
    }
}