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// Copyright (C) 2023 Matthew Waters <matthew@centricular.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at
// <https://mozilla.org/MPL/2.0/>.
//
// SPDX-License-Identifier: MPL-2.0
use cea708_types::{tables::*, Service};
use gst::glib::once_cell::sync::Lazy;
static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
gst::DebugCategory::new(
"cea708utils",
gst::DebugColorFlags::empty(),
Some("CEA-708 Utilities"),
)
});
#[derive(Debug)]
pub enum WriteError {
// returns the number of characters/bytes written
WouldOverflow(usize),
}
pub(crate) struct Cea708ServiceWriter {
service: Option<Service>,
service_no: u8,
active_window: WindowBits,
hidden_window: WindowBits,
}
impl Cea708ServiceWriter {
pub fn new(service_no: u8) -> Self {
Self {
service: None,
service_no,
active_window: WindowBits::ZERO,
hidden_window: WindowBits::ONE,
}
}
fn ensure_service(&mut self) {
if self.service.is_none() {
self.service = Some(Service::new(self.service_no));
}
}
pub fn take_service(&mut self) -> Option<Service> {
self.service.take()
}
pub fn popon_preamble(&mut self) -> Result<usize, WriteError> {
gst::trace!(CAT, "popon_preamble");
let window = match self.hidden_window {
// switch up the newly defined window
WindowBits::ZERO => 0,
WindowBits::ONE => 1,
_ => unreachable!(),
};
let args = DefineWindowArgs::new(
window,
0,
Anchor::BottomMiddle,
false,
70,
105,
14,
31,
true,
true,
false,
1,
1,
);
gst::trace!(CAT, "active window {:?}", self.active_window);
let codes = [
Code::DeleteWindows(!self.active_window),
Code::DefineWindow(args),
];
self.push_codes(&codes)
}
pub fn clear_current_window(&mut self) -> Result<usize, WriteError> {
gst::trace!(CAT, "clear_current_window {:?}", self.active_window);
self.push_codes(&[Code::ClearWindows(self.active_window)])
}
pub fn clear_hidden_window(&mut self) -> Result<usize, WriteError> {
gst::trace!(CAT, "clear_hidden_window");
self.push_codes(&[Code::ClearWindows(self.hidden_window)])
}
pub fn end_of_caption(&mut self) -> Result<usize, WriteError> {
gst::trace!(CAT, "end_of_caption");
let ret =
self.push_codes(&[Code::ToggleWindows(self.active_window | self.hidden_window)])?;
std::mem::swap(&mut self.active_window, &mut self.hidden_window);
gst::trace!(CAT, "active window {:?}", self.active_window);
Ok(ret)
}
pub fn paint_on_preamble(&mut self) -> Result<usize, WriteError> {
gst::trace!(CAT, "paint_on_preamble");
let window = match self.active_window {
WindowBits::ZERO => 0,
WindowBits::ONE => 1,
_ => unreachable!(),
};
self.push_codes(&[
// FIXME: assumes positioning in a 16:9 ratio
Code::DefineWindow(DefineWindowArgs::new(
window,
0,
Anchor::BottomMiddle,
false,
70,
105,
14,
31,
true,
true,
true,
1,
1,
)),
])
}
pub fn rollup_preamble(&mut self, rollup_count: u8, base_row: u8) -> Result<usize, WriteError> {
let base_row = std::cmp::max(rollup_count, base_row);
let anchor_vertical = (base_row as u32 * 100 / 15) as u8;
gst::trace!(
CAT,
"rollup_preamble base {base_row} count {rollup_count}, anchor-v {anchor_vertical}"
);
let codes = [
Code::DeleteWindows(!WindowBits::ZERO),
Code::DefineWindow(DefineWindowArgs::new(
0,
0,
Anchor::BottomMiddle,
true,
anchor_vertical,
50,
rollup_count - 1,
31,
true,
true,
true,
1,
1,
)),
Code::SetPenLocation(SetPenLocationArgs::new(rollup_count - 1, 0)),
];
self.active_window = WindowBits::ZERO;
self.hidden_window = WindowBits::ONE;
self.push_codes(&codes)
}
pub fn write_char(&mut self, c: char) -> Result<usize, WriteError> {
if let Some(code) = Code::from_char(c) {
self.push_codes(&[code])
} else {
Ok(0)
}
}
pub fn push_codes(&mut self, codes: &[Code]) -> Result<usize, WriteError> {
self.ensure_service();
let service = self.service.as_mut().unwrap();
let start_len = service.len();
if service.free_space() < codes.iter().map(|c| c.byte_len()).sum::<usize>() {
return Err(WriteError::WouldOverflow(0));
}
for code in codes.iter() {
gst::trace!(
CAT,
"pushing for service:{} code: {code:?}",
service.number()
);
service.push_code(code).unwrap();
}
Ok(service.len() - start_len)
}
pub fn etx(&mut self) -> Result<usize, WriteError> {
self.push_codes(&[Code::ETX])
}
pub fn carriage_return(&mut self) -> Result<usize, WriteError> {
self.push_codes(&[Code::CR])
}
pub fn set_pen_attributes(&mut self, args: SetPenAttributesArgs) -> Result<usize, WriteError> {
self.push_codes(&[Code::SetPenAttributes(args)])
}
pub fn set_pen_location(&mut self, args: SetPenLocationArgs) -> Result<usize, WriteError> {
self.push_codes(&[Code::SetPenLocation(args)])
}
pub fn set_pen_color(&mut self, args: SetPenColorArgs) -> Result<usize, WriteError> {
self.push_codes(&[Code::SetPenColor(args)])
}
}
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