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Replace the MAX_BUFFER_AGE const generic with a runtime enum

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Having a const generic for that didn't turn to be a good API.
Also made the C++ side more difficult

(Also renamed buffer_stride to pixel_stride)

Closes #2135
This commit is contained in:
Olivier Goffart 2023-02-08 14:44:01 +01:00 • committed by GitHub
parent 05e00fe057
commit a19efc30db
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12 changed files with 134 additions and 148 deletions
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27
api/rs/slint/mcu.md
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@ -131,7 +131,7 @@ slint::include_modules!();
# */
struct MyPlatform {
window: Rc<MinimalSoftwareWindow<2>>,
window: Rc<MinimalSoftwareWindow>,
// optional: some timer device from your device's HAL crate
timer: hal::Timer,
// ... maybe more devices
@ -158,7 +158,7 @@ fn main() {
// ...
// Initialize a window (we'll need it later).
let window = MinimalSoftwareWindow::new();
let window = MinimalSoftwareWindow::new(Default::default());
slint::platform::set_platform(Box::new(MyPlatform {
window: window.clone(),
timer: hal::Timer(/*...*/),
@ -195,8 +195,8 @@ A typical super loop with Slint combines the tasks of querying input drivers, ap
rendering and possibly putting the device into a low-power sleep state. Below is an example:
```rust,no_run
use slint::platform::{software_renderer::MinimalSoftwareWindow};
let window = MinimalSoftwareWindow::<0>::new();
use slint::platform::software_renderer::MinimalSoftwareWindow;
let window = MinimalSoftwareWindow::new(Default::default());
# fn check_for_touch_event() -> Option<slint::platform::WindowEvent> { todo!() }
# mod hal { pub fn wfi() {} }
//...
@ -260,10 +260,11 @@ the second buffer, the back buffer.
use slint::platform::software_renderer::Rgb565Pixel;
# fn is_swap_pending()->bool {false} fn swap_buffers() {}
// Note that we use `2` as the const generic parameter which is our buffer count,
// since we have two buffer, we always need to refresh what changed in the two
// previous frames
let window = slint::platform::software_renderer::MinimalSoftwareWindow::<2>::new();
// In this example, we have two buffer: one is currently displayed, and we are
// rendering into the second one. Hence we use `RepaintBufferType::SwappedBuffers`
let window = slint::platform::software_renderer::MinimalSoftwareWindow::new(
slint::platform::software_renderer::RepaintBufferType::SwappedBuffers
);
const DISPLAY_WIDTH: usize = 320;
const DISPLAY_HEIGHT: usize = 240;
@ -357,11 +358,13 @@ impl<T: DrawTarget<Color = embedded_graphics_core::pixelcolor::Rgb565>>
}
}
// Note that we use `1` as the const generic parameter for MinimalSoftwareWindow to indicate
// the maximum age of the buffer we provide to `render_fn` inside `process_line`.
// Note that we use `ReusedBuffer` as parameter for MinimalSoftwareWindow to indicate
// that we just need to re-render what changed since the last frame.
// What's shown on the screen buffer is not in our RAM, but actually within the display itself.
// We just need to re-render what changed since the last frame.
let window = slint::platform::software_renderer::MinimalSoftwareWindow::<1>::new();
// Only the changed part of the screen will be updated.
let window = slint::platform::software_renderer::MinimalSoftwareWindow::new(
slint::platform::software_renderer::RepaintBufferType::ReusedBuffer
);
const DISPLAY_WIDTH: usize = 320;
let mut line_buffer = [slint::platform::software_renderer::Rgb565Pixel(0); DISPLAY_WIDTH];