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d698af5326
Their choice of i16 is specific to the software renderer. In say the Skia renderer the physical coordinate space would still use Skia's Scalar (floating points).
1357 lines
53 KiB
Rust
1357 lines
53 KiB
Rust
// Copyright © SixtyFPS GmbH <info@slint-ui.com>
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// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial
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//! This module contains the [`SoftwareRenderer`] and related types.
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#![warn(missing_docs)]
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mod draw_functions;
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mod fonts;
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use crate::api::Window;
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use crate::graphics::{IntRect, PixelFormat, Rect as RectF, SharedImageBuffer};
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use crate::item_rendering::ItemRenderer;
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use crate::items::{ImageFit, ItemRc};
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use crate::lengths::{
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LogicalItemGeometry, LogicalLength, LogicalPoint, LogicalRect, PhysicalPx, PointLengths,
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RectLengths, ScaleFactor, SizeLengths,
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};
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use crate::renderer::Renderer;
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use crate::textlayout::{FontMetrics as _, TextParagraphLayout};
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use crate::window::{WindowAdapter, WindowInner};
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use crate::{Color, Coord, ImageInner, StaticTextures};
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use alloc::rc::{Rc, Weak};
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use alloc::{vec, vec::Vec};
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use core::cell::{Cell, RefCell};
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use core::pin::Pin;
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pub use draw_functions::{PremultipliedRgbaColor, Rgb565Pixel, TargetPixel};
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type PhysicalLength = euclid::Length<i16, PhysicalPx>;
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type PhysicalRect = euclid::Rect<i16, PhysicalPx>;
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type PhysicalSize = euclid::Size2D<i16, PhysicalPx>;
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type PhysicalPoint = euclid::Point2D<i16, PhysicalPx>;
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type DirtyRegion = PhysicalRect;
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/// This trait defines a bi-directional interface between Slint and your code to send lines to your screen, when using
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/// the [`SoftwareRenderer::render_by_line`] function.
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///
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/// * Through the associated `TargetPixel` type Slint knows how to create and manipulate pixels without having to know
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/// the exact device-specific binary representation and operations for blending.
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/// * Through the `process_line` function Slint notifies you when a line can be rendered and provides a callback that
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/// you can invoke to fill a slice of pixels for the given line.
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///
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/// See the [`render_by_line`](SoftwareRenderer::render_by_line) documentation for an example.
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pub trait LineBufferProvider {
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/// The pixel type of the buffer
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type TargetPixel: TargetPixel;
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/// Called once per line, you will have to call the render_fn back with the buffer.
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///
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/// The `line` is the y position of the line to be drawn.
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/// The `range` is the range within the line that is going to be rendered (eg, within the dirty region)
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/// The `render_fn` function should be called to render the line, passing the buffer
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/// corresponding to the specified line and range.
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fn process_line(
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&mut self,
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line: usize,
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range: core::ops::Range<usize>,
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render_fn: impl FnOnce(&mut [Self::TargetPixel]),
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);
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}
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/// A Renderer that do the rendering in software
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///
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/// The renderer can remember what items needs to be redrawn from the previous iteration.
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///
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/// There are two kind of possible rendering
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/// 1. Using [`render()`](Self::render()) to render the window in a buffer
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/// 2. Using [`render_by_line()`](Self::render()) to render the window line by line. This
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/// is only useful if the device does not have enough memory to render the whole window
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/// in one single buffer
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///
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/// ### `MAX_BUFFER_AGE`
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///
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/// The `MAX_BUFFER_AGE` parameter specifies how many buffers are being re-used.
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/// This means that the buffer passed to the render functions still contains a rendering of
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/// the window that was refreshed as least that amount of frame ago.
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/// It will impact how much of the screen needs to be redrawn.
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///
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/// Typical value can be:
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/// - **0:** No attempt at tracking dirty items will be made. The full screen is always redrawn.
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/// - **1:** Only redraw the parts that have changed since the previous call to render.
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/// This is assuming that the same buffer is passed on every call to render.
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/// - **2:** Redraw the part that have changed during the two last frames.
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/// This is assuming double buffering and swapping of the buffers.
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pub struct SoftwareRenderer<const MAX_BUFFER_AGE: usize> {
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partial_cache: RefCell<crate::item_rendering::PartialRenderingCache>,
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/// This is the area which we are going to redraw in the next frame, no matter if the items are dirty or not
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force_dirty: Cell<crate::item_rendering::DirtyRegion>,
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/// This is the area which was dirty on the previous frames, in case we do double buffering
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///
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/// We really only need MAX_BUFFER_AGE - 1 but that's not allowed because we cannot do operations with
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/// generic parameters
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prev_frame_dirty: [Cell<DirtyRegion>; MAX_BUFFER_AGE],
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window: Weak<dyn crate::window::WindowAdapter>,
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}
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impl<const MAX_BUFFER_AGE: usize> SoftwareRenderer<MAX_BUFFER_AGE> {
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/// Create a new Renderer for a given window.
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///
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/// The `window` parameter can be coming from [`Rc::new_cyclic()`](alloc::rc::Rc::new_cyclic())
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/// since the `WindowAdapter` most likely own the Renderer
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pub fn new(window: Weak<dyn crate::window::WindowAdapter>) -> Self {
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Self {
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window: window.clone(),
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partial_cache: Default::default(),
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force_dirty: Default::default(),
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prev_frame_dirty: [DirtyRegion::default(); MAX_BUFFER_AGE].map(|x| x.into()),
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}
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}
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/// Internal function to apply a dirty region depending on the dirty_tracking_policy.
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/// Returns the region to actually draw.
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fn apply_dirty_region(
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&self,
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dirty_region: DirtyRegion,
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screen_size: PhysicalSize,
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) -> DirtyRegion {
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if MAX_BUFFER_AGE == 0 {
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PhysicalRect { origin: euclid::point2(0, 0), size: screen_size }
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} else if MAX_BUFFER_AGE == 1 {
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dirty_region
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} else if MAX_BUFFER_AGE == 2 {
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dirty_region.union(&self.prev_frame_dirty[0].replace(dirty_region))
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} else {
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let mut prev = dirty_region;
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let mut union = dirty_region;
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for x in self.prev_frame_dirty.iter().skip(1) {
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prev = x.replace(prev);
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union = union.union(&prev);
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}
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union
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}
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.intersection(&PhysicalRect { origin: euclid::point2(0, 0), size: screen_size })
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.unwrap_or_default()
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}
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/// Render the window to the given frame buffer.
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///
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/// The renderer uses a cache internally and will only render the part of the window
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/// which are dirty. The `extra_draw_region` is an extra regin which will also
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/// be rendered. (eg: the previous dirty region in case of double buffering)
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///
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/// returns the dirty region for this frame (not including the extra_draw_region)
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pub fn render(&self, buffer: &mut [impl TargetPixel], buffer_stride: usize) {
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let window = self.window.upgrade().expect("render() called on a destroyed Window");
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let window_inner = WindowInner::from_pub(window.window());
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let factor = ScaleFactor::new(window_inner.scale_factor());
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let (size, background) = if let Some(window_item) =
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window_inner.window_item().as_ref().map(|item| item.as_pin_ref())
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{
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(
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(euclid::size2(window_item.width() as f32, window_item.height() as f32) * factor)
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.cast(),
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window_item.background(),
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)
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} else {
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(
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euclid::size2(buffer_stride as _, (buffer.len() / buffer_stride) as _),
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Color::default(),
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)
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};
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let buffer_renderer = SceneBuilder::new(
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size,
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factor,
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window_inner,
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RenderToBuffer { buffer, stride: buffer_stride },
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);
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let mut renderer = crate::item_rendering::PartialRenderer::new(
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&self.partial_cache,
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self.force_dirty.take(),
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buffer_renderer,
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);
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window_inner.draw_contents(|components| {
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for (component, origin) in components {
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renderer.compute_dirty_regions(component, *origin);
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}
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let dirty_region = (LogicalRect::from_untyped(&renderer.dirty_region.to_rect()).cast()
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* factor)
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.round_out()
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.cast();
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let to_draw = self.apply_dirty_region(dirty_region, size);
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renderer.combine_clip((to_draw.cast() / factor).to_untyped().cast(), 0 as _, 0 as _);
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if background.alpha() != 0 {
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renderer.actual_renderer.processor.process_rectangle(to_draw, background);
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}
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for (component, origin) in components {
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crate::item_rendering::render_component_items(component, &mut renderer, *origin);
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}
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});
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}
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/// Render the window, line by line, into the line buffer provided by the `line_callback` function.
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///
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/// The renderer uses a cache internally and will only render the part of the window
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/// which are dirty, depending on the dirty tracking policy set in [`SoftwareRenderer::new`]
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///
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/// The line callback will be called for each line and should provide a buffer to draw into.
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///
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/// As an example, let's imagine we want to render into a plain buffer.
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/// (You wouldn't normally use `render_by_line` for that because the [`Self::render`] would
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/// then be more efficient)
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///
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/// ```rust
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/// # use i_slint_core::software_renderer::{LineBufferProvider, SoftwareRenderer, Rgb565Pixel};
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/// # fn xxx<'a>(the_frame_buffer: &'a mut [Rgb565Pixel], display_width: usize, renderer: &SoftwareRenderer<0>) {
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/// struct FrameBuffer<'a>{ frame_buffer: &'a mut [Rgb565Pixel], stride: usize }
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/// impl<'a> LineBufferProvider for FrameBuffer<'a> {
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/// type TargetPixel = Rgb565Pixel;
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/// fn process_line(
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/// &mut self,
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/// line: usize,
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/// range: core::ops::Range<usize>,
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/// render_fn: impl FnOnce(&mut [Self::TargetPixel]),
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/// ) {
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/// let line_begin = line * self.stride;
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/// render_fn(&mut self.frame_buffer[line_begin..][range]);
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/// // The line has been rendered and there could be code here to
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/// // send the pixel to the display
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/// }
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/// }
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/// renderer.render_by_line(FrameBuffer{ frame_buffer: the_frame_buffer, stride: display_width });
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/// # }
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/// ```
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pub fn render_by_line(&self, line_buffer: impl LineBufferProvider) {
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let window = self.window.upgrade().expect("render() called on a destroyed Window");
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let window_inner = WindowInner::from_pub(window.window());
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let component_rc = window_inner.component();
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let component = crate::component::ComponentRc::borrow_pin(&component_rc);
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if let Some(window_item) = crate::items::ItemRef::downcast_pin::<crate::items::WindowItem>(
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component.as_ref().get_item_ref(0),
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) {
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let factor = ScaleFactor::new(window_inner.scale_factor());
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let size =
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euclid::size2(window_item.width() as f32, window_item.height() as f32) * factor;
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render_window_frame_by_line(
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window_inner,
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window_item.background(),
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size.cast(),
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&self,
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line_buffer,
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);
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}
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}
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}
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#[doc(hidden)]
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impl<const MAX_BUFFER_AGE: usize> Renderer for SoftwareRenderer<MAX_BUFFER_AGE> {
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fn text_size(
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&self,
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font_request: crate::graphics::FontRequest,
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text: &str,
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max_width: Option<Coord>,
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scale_factor: f32,
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) -> crate::graphics::Size {
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fonts::text_size(font_request, text, max_width, ScaleFactor::new(scale_factor)).to_untyped()
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}
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fn text_input_byte_offset_for_position(
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&self,
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_text_input: Pin<&crate::items::TextInput>,
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_pos: crate::graphics::Point,
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) -> usize {
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0
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}
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fn text_input_cursor_rect_for_byte_offset(
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&self,
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_text_input: Pin<&crate::items::TextInput>,
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_byte_offset: usize,
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) -> crate::graphics::Rect {
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Default::default()
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}
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fn free_graphics_resources(
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&self,
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items: &mut dyn Iterator<Item = Pin<crate::items::ItemRef<'_>>>,
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) {
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for item in items {
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let cache_entry =
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item.cached_rendering_data_offset().release(&mut self.partial_cache.borrow_mut());
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drop(cache_entry);
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}
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}
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fn mark_dirty_region(&self, region: crate::item_rendering::DirtyRegion) {
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self.force_dirty.set(self.force_dirty.get().union(®ion))
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}
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fn register_bitmap_font(&self, font_data: &'static crate::graphics::BitmapFont) {
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fonts::register_bitmap_font(font_data);
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}
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}
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fn render_window_frame_by_line<const MAX_BUFFER_AGE: usize>(
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window: &WindowInner,
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background: Color,
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size: PhysicalSize,
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renderer: &SoftwareRenderer<MAX_BUFFER_AGE>,
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mut line_buffer: impl LineBufferProvider,
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) {
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let mut scene = prepare_scene(window, size, renderer);
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let dirty_region = scene.dirty_region;
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debug_assert!(scene.current_line >= dirty_region.origin.y_length());
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while scene.current_line < dirty_region.origin.y_length() + dirty_region.size.height_length() {
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line_buffer.process_line(
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scene.current_line.get() as usize,
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dirty_region.min_x() as usize..dirty_region.max_x() as usize,
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|line_buffer| {
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let offset = dirty_region.min_x() as usize;
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TargetPixel::blend_slice(line_buffer, background.into());
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for span in scene.items[0..scene.current_items_index].iter().rev() {
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debug_assert!(scene.current_line >= span.pos.y_length());
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debug_assert!(
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scene.current_line < span.pos.y_length() + span.size.height_length(),
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);
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match span.command {
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SceneCommand::Rectangle { color } => {
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TargetPixel::blend_slice(
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&mut line_buffer[span.pos.x as usize - offset
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..(span.pos.x_length() + span.size.width_length()).get()
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as usize
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- offset],
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color,
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);
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}
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SceneCommand::Texture { texture_index } => {
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let texture = &scene.textures[texture_index as usize];
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draw_functions::draw_texture_line(
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&PhysicalRect {
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origin: span.pos - euclid::vec2(offset as i16, 0),
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size: span.size,
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},
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scene.current_line,
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texture,
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line_buffer,
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);
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}
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SceneCommand::SharedBuffer { shared_buffer_index } => {
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let texture =
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scene.shared_buffers[shared_buffer_index as usize].as_texture();
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draw_functions::draw_texture_line(
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&PhysicalRect {
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origin: span.pos - euclid::vec2(offset as i16, 0),
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size: span.size,
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},
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scene.current_line,
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&texture,
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line_buffer,
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);
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}
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SceneCommand::RoundedRectangle { rectangle_index } => {
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let rr = &scene.rounded_rectangles[rectangle_index as usize];
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draw_functions::draw_rounded_rectangle_line(
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&PhysicalRect {
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origin: span.pos - euclid::vec2(offset as i16, 0),
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size: span.size,
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},
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scene.current_line,
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rr,
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line_buffer,
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);
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}
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}
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}
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},
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);
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if scene.current_line < dirty_region.origin.y_length() + dirty_region.size.height_length() {
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scene.next_line();
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}
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}
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}
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struct Scene {
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/// the next line to be processed
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current_line: PhysicalLength,
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/// The items are sorted like so:
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/// - `items[future_items_index..]` are the items that have `y > current_line`.
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/// They must be sorted by `y` (top to bottom), then by `z` (front to back)
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/// - `items[..current_items_index]` are the items that overlap with the current_line,
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/// sorted by z (front to back)
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items: Vec<SceneItem>,
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future_items_index: usize,
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current_items_index: usize,
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textures: Vec<SceneTexture<'static>>,
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rounded_rectangles: Vec<RoundedRectangle>,
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shared_buffers: Vec<SharedBufferCommand>,
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dirty_region: DirtyRegion,
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}
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impl Scene {
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pub fn new(
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mut items: Vec<SceneItem>,
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textures: Vec<SceneTexture<'static>>,
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rounded_rectangles: Vec<RoundedRectangle>,
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shared_buffers: Vec<SharedBufferCommand>,
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dirty_region: DirtyRegion,
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) -> Self {
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let current_line = dirty_region.origin.y_length();
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items.retain(|i| i.pos.y_length() + i.size.height_length() > current_line);
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items.sort_unstable_by(|a, b| compare_scene_item(a, b));
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let current_items_index = items.partition_point(|i| i.pos.y_length() <= current_line);
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items[..current_items_index].sort_unstable_by(|a, b| b.z.cmp(&a.z));
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Self {
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items,
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current_line,
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current_items_index,
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future_items_index: current_items_index,
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textures,
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rounded_rectangles,
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shared_buffers,
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dirty_region,
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}
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}
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/// Updates `current_items_index` and `future_items_index` to match the invariant
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pub fn next_line(&mut self) {
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self.current_line += PhysicalLength::new(1);
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// The items array is split in part:
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// 1. [0..i] are the items that have already been processed, that are on this line
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// 2. [j..current_items_index] are the items from the previous line that might still be
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// valid on this line
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// 3. [tmp1, tmp2] is a buffer where we swap items so we can make room for the items in [0..i]
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// 4. [future_items_index..] are the items which might get processed now
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// 5. [current_items_index..tmp1], [tmp2..future_items_index] and [i..j] is garbage
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//
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// At each step, we selecting the item with the higher z from the list 2 or 3 or 4 and take it from
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// that list. Then we add it to the list [0..i] if it needs more processing. If needed,
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// we move the first item from list 2. to list 3. to make some room
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let (mut i, mut j, mut tmp1, mut tmp2) =
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(0, 0, self.current_items_index, self.current_items_index);
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'outer: loop {
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let future_next_z = self
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.items
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.get(self.future_items_index)
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.filter(|i| i.pos.y_length() <= self.current_line)
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.map(|i| i.z);
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let item = loop {
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if tmp1 != tmp2 {
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if future_next_z.map_or(true, |z| self.items[tmp1].z > z) {
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let idx = tmp1;
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tmp1 += 1;
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if tmp1 == tmp2 {
|
|
tmp1 = self.current_items_index;
|
|
tmp2 = self.current_items_index;
|
|
}
|
|
break self.items[idx];
|
|
}
|
|
} else if j < self.current_items_index {
|
|
let item = &self.items[j];
|
|
if item.pos.y_length() + item.size.height_length() <= self.current_line {
|
|
j += 1;
|
|
continue;
|
|
}
|
|
if future_next_z.map_or(true, |z| item.z > z) {
|
|
j += 1;
|
|
break *item;
|
|
}
|
|
}
|
|
if future_next_z.is_some() {
|
|
self.future_items_index += 1;
|
|
break self.items[self.future_items_index - 1];
|
|
}
|
|
break 'outer;
|
|
};
|
|
if i != j {
|
|
// there is room
|
|
} else if j >= self.current_items_index && tmp1 == tmp2 {
|
|
// the current_items list is empty
|
|
j += 1
|
|
} else if self.items[j].pos.y_length() + self.items[j].size.height_length()
|
|
<= self.current_line
|
|
{
|
|
// next item in the current_items array is no longer in this line
|
|
j += 1;
|
|
} else if tmp2 < self.future_items_index && j < self.current_items_index {
|
|
// move the next item in current_items
|
|
let to_move = self.items[j];
|
|
self.items[tmp2] = to_move;
|
|
j += 1;
|
|
tmp2 += 1;
|
|
} else {
|
|
debug_assert!(tmp1 >= self.current_items_index);
|
|
let sort_begin = i;
|
|
// merge sort doesn't work because we don't have enough tmp space, just bring all items and use a normal sort.
|
|
while j < self.current_items_index {
|
|
let item = self.items[j];
|
|
if item.pos.y_length() + item.size.height_length() > self.current_line {
|
|
self.items[i] = item;
|
|
i += 1;
|
|
}
|
|
j += 1;
|
|
}
|
|
self.items.copy_within(tmp1..tmp2, i);
|
|
i += tmp2 - tmp1;
|
|
debug_assert!(i < self.future_items_index);
|
|
self.items[i] = item;
|
|
i += 1;
|
|
while self.future_items_index < self.items.len() {
|
|
let item = self.items[self.future_items_index];
|
|
if item.pos.y_length() > self.current_line {
|
|
break;
|
|
}
|
|
self.items[i] = item;
|
|
i += 1;
|
|
self.future_items_index += 1;
|
|
}
|
|
self.items[sort_begin..i].sort_unstable_by(|a, b| b.z.cmp(&a.z));
|
|
break;
|
|
}
|
|
self.items[i] = item;
|
|
i += 1;
|
|
}
|
|
self.current_items_index = i;
|
|
// check that current items are properly sorted
|
|
debug_assert!(self.items[0..self.current_items_index].windows(2).all(|x| x[0].z >= x[1].z));
|
|
}
|
|
}
|
|
|
|
#[derive(Clone, Copy, Debug)]
|
|
struct SceneItem {
|
|
pos: PhysicalPoint,
|
|
size: PhysicalSize,
|
|
// this is the order of the item from which it is in the item tree
|
|
z: u16,
|
|
command: SceneCommand,
|
|
}
|
|
|
|
fn compare_scene_item(a: &SceneItem, b: &SceneItem) -> core::cmp::Ordering {
|
|
// First, order by line (top to bottom)
|
|
match a.pos.y.partial_cmp(&b.pos.y) {
|
|
None | Some(core::cmp::Ordering::Equal) => {}
|
|
Some(ord) => return ord,
|
|
}
|
|
// Then by the reverse z (front to back)
|
|
match a.z.partial_cmp(&b.z) {
|
|
None | Some(core::cmp::Ordering::Equal) => {}
|
|
Some(ord) => return ord.reverse(),
|
|
}
|
|
|
|
// anything else, we don't care
|
|
core::cmp::Ordering::Equal
|
|
}
|
|
|
|
#[derive(Clone, Copy, Debug)]
|
|
#[repr(u8)]
|
|
enum SceneCommand {
|
|
Rectangle {
|
|
color: PremultipliedRgbaColor,
|
|
},
|
|
/// texture_index is an index in the Scene::textures array
|
|
Texture {
|
|
texture_index: u16,
|
|
},
|
|
/// shared_buffer_index is an index in Scene::shared_buffers
|
|
SharedBuffer {
|
|
shared_buffer_index: u16,
|
|
},
|
|
/// rectangle_index is an index in the Scene::rounded_rectangle array
|
|
RoundedRectangle {
|
|
rectangle_index: u16,
|
|
},
|
|
}
|
|
|
|
struct SceneTexture<'a> {
|
|
data: &'a [u8],
|
|
format: PixelFormat,
|
|
/// bytes between two lines in the source
|
|
stride: u16,
|
|
source_size: PhysicalSize,
|
|
color: Color,
|
|
}
|
|
|
|
struct SharedBufferCommand {
|
|
buffer: SharedImageBuffer,
|
|
/// The source rectangle that is mapped into this command span
|
|
source_rect: PhysicalRect,
|
|
colorize: Color,
|
|
}
|
|
|
|
impl SharedBufferCommand {
|
|
fn as_texture(&self) -> SceneTexture<'_> {
|
|
let begin = self.buffer.width() as usize * self.source_rect.min_y() as usize
|
|
+ self.source_rect.min_x() as usize;
|
|
|
|
match &self.buffer {
|
|
SharedImageBuffer::RGB8(b) => SceneTexture {
|
|
data: &b.as_bytes()[begin * 3..],
|
|
stride: 3 * b.stride() as u16,
|
|
format: PixelFormat::Rgb,
|
|
source_size: self.source_rect.size,
|
|
color: self.colorize,
|
|
},
|
|
SharedImageBuffer::RGBA8(b) => SceneTexture {
|
|
data: &b.as_bytes()[begin * 4..],
|
|
stride: 4 * b.stride() as u16,
|
|
format: PixelFormat::Rgba,
|
|
source_size: self.source_rect.size,
|
|
color: self.colorize,
|
|
},
|
|
SharedImageBuffer::RGBA8Premultiplied(b) => SceneTexture {
|
|
data: &b.as_bytes()[begin * 4..],
|
|
stride: 4 * b.stride() as u16,
|
|
format: PixelFormat::RgbaPremultiplied,
|
|
source_size: self.source_rect.size,
|
|
color: self.colorize,
|
|
},
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct RoundedRectangle {
|
|
radius: PhysicalLength,
|
|
/// the border's width
|
|
width: PhysicalLength,
|
|
border_color: PremultipliedRgbaColor,
|
|
inner_color: PremultipliedRgbaColor,
|
|
/// The clips is the amount of pixels of the rounded rectangle that is clipped away.
|
|
/// For example, if left_clip > width, then the left border will not be visible, and
|
|
/// if left_clip > radius, then no radius will be seen in the left side
|
|
left_clip: PhysicalLength,
|
|
right_clip: PhysicalLength,
|
|
top_clip: PhysicalLength,
|
|
bottom_clip: PhysicalLength,
|
|
}
|
|
|
|
fn prepare_scene<const MAX_BUFFER_AGE: usize>(
|
|
window: &WindowInner,
|
|
size: PhysicalSize,
|
|
software_renderer: &SoftwareRenderer<MAX_BUFFER_AGE>,
|
|
) -> Scene {
|
|
let factor = ScaleFactor::new(window.scale_factor());
|
|
let prepare_scene = SceneBuilder::new(size, factor, window, PrepareScene::default());
|
|
let mut renderer = crate::item_rendering::PartialRenderer::new(
|
|
&software_renderer.partial_cache,
|
|
software_renderer.force_dirty.take(),
|
|
prepare_scene,
|
|
);
|
|
|
|
let mut dirty_region = PhysicalRect::default();
|
|
window.draw_contents(|components| {
|
|
for (component, origin) in components {
|
|
renderer.compute_dirty_regions(component, *origin);
|
|
}
|
|
|
|
dirty_region = (LogicalRect::from_untyped(&renderer.dirty_region.to_rect()).cast()
|
|
* factor)
|
|
.round_out()
|
|
.cast();
|
|
dirty_region = software_renderer.apply_dirty_region(dirty_region, size);
|
|
|
|
renderer.combine_clip((dirty_region.cast() / factor).to_untyped().cast(), 0 as _, 0 as _);
|
|
for (component, origin) in components {
|
|
crate::item_rendering::render_component_items(component, &mut renderer, *origin);
|
|
}
|
|
});
|
|
|
|
let prepare_scene = renderer.into_inner();
|
|
Scene::new(
|
|
prepare_scene.processor.items,
|
|
prepare_scene.processor.textures,
|
|
prepare_scene.processor.rounded_rectangles,
|
|
prepare_scene.processor.shared_buffers,
|
|
dirty_region,
|
|
)
|
|
}
|
|
|
|
trait ProcessScene {
|
|
fn process_texture(&mut self, geometry: PhysicalRect, texture: SceneTexture<'static>);
|
|
fn process_rectangle(&mut self, geometry: PhysicalRect, color: Color);
|
|
fn process_rounded_rectangle(&mut self, geometry: PhysicalRect, data: RoundedRectangle);
|
|
fn process_shared_image_buffer(&mut self, geometry: PhysicalRect, buffer: SharedBufferCommand);
|
|
}
|
|
|
|
struct RenderToBuffer<'a, TargetPixel> {
|
|
buffer: &'a mut [TargetPixel],
|
|
stride: usize,
|
|
}
|
|
|
|
impl<'a, T: TargetPixel> ProcessScene for RenderToBuffer<'a, T> {
|
|
fn process_texture(&mut self, geometry: PhysicalRect, texture: SceneTexture<'static>) {
|
|
for line in geometry.min_y()..geometry.max_y() {
|
|
draw_functions::draw_texture_line(
|
|
&geometry,
|
|
PhysicalLength::new(line),
|
|
&texture,
|
|
&mut self.buffer[line as usize * self.stride..],
|
|
);
|
|
}
|
|
}
|
|
|
|
fn process_shared_image_buffer(&mut self, geometry: PhysicalRect, buffer: SharedBufferCommand) {
|
|
let texture = buffer.as_texture();
|
|
for line in geometry.min_y()..geometry.max_y() {
|
|
draw_functions::draw_texture_line(
|
|
&geometry,
|
|
PhysicalLength::new(line),
|
|
&texture,
|
|
&mut self.buffer[line as usize * self.stride..],
|
|
);
|
|
}
|
|
}
|
|
|
|
fn process_rectangle(&mut self, geometry: PhysicalRect, color: Color) {
|
|
let color = PremultipliedRgbaColor::from(color);
|
|
for line in geometry.min_y()..geometry.max_y() {
|
|
let begin = line as usize * self.stride + geometry.origin.x as usize;
|
|
TargetPixel::blend_slice(
|
|
&mut self.buffer[begin..begin + geometry.width() as usize],
|
|
color,
|
|
);
|
|
}
|
|
}
|
|
|
|
fn process_rounded_rectangle(&mut self, geometry: PhysicalRect, rr: RoundedRectangle) {
|
|
for line in geometry.min_y()..geometry.max_y() {
|
|
draw_functions::draw_rounded_rectangle_line(
|
|
&geometry,
|
|
PhysicalLength::new(line),
|
|
&rr,
|
|
&mut self.buffer[line as usize * self.stride..],
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Default)]
|
|
struct PrepareScene {
|
|
items: Vec<SceneItem>,
|
|
textures: Vec<SceneTexture<'static>>,
|
|
rounded_rectangles: Vec<RoundedRectangle>,
|
|
shared_buffers: Vec<SharedBufferCommand>,
|
|
}
|
|
|
|
impl ProcessScene for PrepareScene {
|
|
fn process_texture(&mut self, geometry: PhysicalRect, texture: SceneTexture<'static>) {
|
|
let size = geometry.size;
|
|
if !size.is_empty() {
|
|
let texture_index = self.textures.len() as u16;
|
|
self.textures.push(texture);
|
|
self.items.push(SceneItem {
|
|
pos: geometry.origin,
|
|
size,
|
|
z: self.items.len() as u16,
|
|
command: SceneCommand::Texture { texture_index },
|
|
});
|
|
}
|
|
}
|
|
|
|
fn process_shared_image_buffer(&mut self, geometry: PhysicalRect, buffer: SharedBufferCommand) {
|
|
let size = geometry.size;
|
|
if !size.is_empty() {
|
|
let shared_buffer_index = self.shared_buffers.len() as u16;
|
|
self.shared_buffers.push(buffer);
|
|
self.items.push(SceneItem {
|
|
pos: geometry.origin,
|
|
size,
|
|
z: self.items.len() as u16,
|
|
command: SceneCommand::SharedBuffer { shared_buffer_index },
|
|
});
|
|
}
|
|
}
|
|
|
|
fn process_rectangle(&mut self, geometry: PhysicalRect, color: Color) {
|
|
let size = geometry.size;
|
|
if !size.is_empty() {
|
|
let z = self.items.len() as u16;
|
|
let pos = geometry.origin;
|
|
let color = PremultipliedRgbaColor::from(color);
|
|
self.items.push(SceneItem { pos, size, z, command: SceneCommand::Rectangle { color } });
|
|
}
|
|
}
|
|
|
|
fn process_rounded_rectangle(&mut self, geometry: PhysicalRect, data: RoundedRectangle) {
|
|
let size = geometry.size;
|
|
if !size.is_empty() {
|
|
let rectangle_index = self.rounded_rectangles.len() as u16;
|
|
self.rounded_rectangles.push(data);
|
|
self.items.push(SceneItem {
|
|
pos: geometry.origin,
|
|
size,
|
|
z: self.items.len() as u16,
|
|
command: SceneCommand::RoundedRectangle { rectangle_index },
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
struct SceneBuilder<'a, T> {
|
|
processor: T,
|
|
state_stack: Vec<RenderState>,
|
|
current_state: RenderState,
|
|
scale_factor: ScaleFactor,
|
|
window: &'a WindowInner,
|
|
}
|
|
|
|
impl<'a, T: ProcessScene> SceneBuilder<'a, T> {
|
|
fn new(
|
|
size: PhysicalSize,
|
|
scale_factor: ScaleFactor,
|
|
window: &'a WindowInner,
|
|
processor: T,
|
|
) -> Self {
|
|
Self {
|
|
processor,
|
|
state_stack: vec![],
|
|
current_state: RenderState {
|
|
alpha: 1.,
|
|
offset: LogicalPoint::default(),
|
|
clip: LogicalRect::new(
|
|
LogicalPoint::default(),
|
|
(size.cast() / scale_factor).cast(),
|
|
),
|
|
},
|
|
scale_factor,
|
|
window,
|
|
}
|
|
}
|
|
|
|
fn should_draw(&self, rect: &LogicalRect) -> bool {
|
|
!rect.size.is_empty()
|
|
&& self.current_state.alpha > 0.01
|
|
&& self.current_state.clip.intersects(rect)
|
|
}
|
|
|
|
fn draw_image_impl(
|
|
&mut self,
|
|
geom: LogicalRect,
|
|
source: &crate::graphics::Image,
|
|
mut source_rect: IntRect,
|
|
image_fit: ImageFit,
|
|
colorize: Color,
|
|
) {
|
|
let image_inner: &ImageInner = source.into();
|
|
let size: euclid::default::Size2D<u32> = source_rect.size.cast();
|
|
let phys_size = geom.size_length().cast() * self.scale_factor;
|
|
let source_to_target_x = phys_size.width / (size.width as f32);
|
|
let source_to_target_y = phys_size.height / (size.height as f32);
|
|
let mut image_fit_offset = euclid::Vector2D::default();
|
|
let (source_to_target_x, source_to_target_y) = match image_fit {
|
|
ImageFit::Fill => (source_to_target_x, source_to_target_y),
|
|
ImageFit::Cover => {
|
|
let ratio = f32::max(source_to_target_x, source_to_target_y);
|
|
if size.width as f32 > phys_size.width / ratio {
|
|
let diff = (size.width as f32 - phys_size.width / ratio) as i32;
|
|
source_rect.origin.x += diff / 2;
|
|
source_rect.size.width -= diff;
|
|
}
|
|
if size.height as f32 > phys_size.height / ratio {
|
|
let diff = (size.height as f32 - phys_size.height / ratio) as i32;
|
|
source_rect.origin.y += diff / 2;
|
|
source_rect.size.height -= diff;
|
|
}
|
|
(ratio, ratio)
|
|
}
|
|
ImageFit::Contain => {
|
|
let ratio = f32::min(source_to_target_x, source_to_target_y);
|
|
if (size.width as f32) < phys_size.width / ratio {
|
|
image_fit_offset.x = (phys_size.width - size.width as f32 * ratio) / 2.;
|
|
}
|
|
if (size.height as f32) < phys_size.height / ratio {
|
|
image_fit_offset.y = (phys_size.height - size.height as f32 * ratio) / 2.;
|
|
}
|
|
(ratio, ratio)
|
|
}
|
|
};
|
|
|
|
let offset =
|
|
self.current_state.offset.to_vector().cast() * self.scale_factor + image_fit_offset;
|
|
|
|
let renderer_clip_in_source_rect_space = (self.current_state.clip.cast()
|
|
* self.scale_factor)
|
|
.scale(1. / source_to_target_x, 1. / source_to_target_y);
|
|
match image_inner {
|
|
ImageInner::None => (),
|
|
ImageInner::StaticTextures(StaticTextures { data, textures, .. }) => {
|
|
for t in textures.as_slice() {
|
|
if let Some(clipped_relative_source_rect) =
|
|
t.rect.intersection(&source_rect).and_then(|clipped_source_rect| {
|
|
let relative_clipped_source_rect = clipped_source_rect
|
|
.translate(-source_rect.origin.to_vector())
|
|
.cast();
|
|
euclid::Rect::<_, PhysicalPx>::from_untyped(
|
|
&relative_clipped_source_rect,
|
|
)
|
|
.intersection(&renderer_clip_in_source_rect_space)
|
|
})
|
|
{
|
|
let target_rect = clipped_relative_source_rect
|
|
.scale(source_to_target_x, source_to_target_y)
|
|
.translate(offset)
|
|
.round();
|
|
|
|
let actual_x = clipped_relative_source_rect.origin.x as usize
|
|
+ source_rect.origin.x as usize
|
|
- t.rect.origin.x as usize;
|
|
let actual_y = clipped_relative_source_rect.origin.y as usize
|
|
+ source_rect.origin.y as usize
|
|
- t.rect.origin.y as usize;
|
|
let stride = t.rect.width() as u16 * t.format.bpp() as u16;
|
|
self.processor.process_texture(
|
|
target_rect.cast(),
|
|
SceneTexture {
|
|
data: &data.as_slice()[(t.index
|
|
+ (stride as usize) * actual_y
|
|
+ (t.format.bpp()) * actual_x)..],
|
|
stride,
|
|
source_size: clipped_relative_source_rect.size.ceil().cast(),
|
|
format: t.format,
|
|
color: if colorize.alpha() > 0 { colorize } else { t.color },
|
|
},
|
|
);
|
|
}
|
|
}
|
|
}
|
|
_ => {
|
|
let img_src_size = source.size().cast::<f32>();
|
|
if let Some(buffer) = image_inner.render_to_buffer(Some(
|
|
euclid::size2(
|
|
phys_size.width * img_src_size.width / size.width as f32,
|
|
phys_size.height * img_src_size.height / size.height as f32,
|
|
)
|
|
.cast(),
|
|
)) {
|
|
if let Some(clipped_relative_source_rect) = renderer_clip_in_source_rect_space
|
|
.intersection(&euclid::rect(
|
|
0.,
|
|
0.,
|
|
source_rect.width() as f32,
|
|
source_rect.height() as f32,
|
|
))
|
|
{
|
|
let target_rect = clipped_relative_source_rect
|
|
.scale(source_to_target_x, source_to_target_y)
|
|
.translate(offset)
|
|
.round();
|
|
let buf_size = buffer.size().cast::<f32>();
|
|
|
|
self.processor.process_shared_image_buffer(
|
|
target_rect.cast(),
|
|
SharedBufferCommand {
|
|
buffer,
|
|
source_rect: clipped_relative_source_rect
|
|
.translate(
|
|
euclid::Point2D::from_untyped(source_rect.origin.cast())
|
|
.to_vector(),
|
|
)
|
|
.scale(
|
|
buf_size.width / img_src_size.width,
|
|
buf_size.height / img_src_size.height,
|
|
)
|
|
.cast(),
|
|
colorize,
|
|
},
|
|
);
|
|
}
|
|
} else {
|
|
unimplemented!("The image cannot be rendered")
|
|
}
|
|
}
|
|
};
|
|
}
|
|
}
|
|
|
|
#[derive(Clone, Copy)]
|
|
struct RenderState {
|
|
alpha: f32,
|
|
offset: LogicalPoint,
|
|
clip: LogicalRect,
|
|
}
|
|
|
|
impl<'a, T: ProcessScene> crate::item_rendering::ItemRenderer for SceneBuilder<'a, T> {
|
|
fn draw_rectangle(&mut self, rect: Pin<&crate::items::Rectangle>, _: &ItemRc) {
|
|
let geom = LogicalRect::new(LogicalPoint::default(), rect.logical_geometry().size_length());
|
|
if self.should_draw(&geom) {
|
|
let geom = match geom.intersection(&self.current_state.clip) {
|
|
Some(geom) => geom,
|
|
None => return,
|
|
};
|
|
|
|
// FIXME: gradients
|
|
let color = rect.background().color();
|
|
if color.alpha() == 0 {
|
|
return;
|
|
}
|
|
self.processor.process_rectangle(
|
|
(geom.translate(self.current_state.offset.to_vector()).cast() * self.scale_factor)
|
|
.round()
|
|
.cast(),
|
|
color,
|
|
);
|
|
}
|
|
}
|
|
|
|
fn draw_border_rectangle(&mut self, rect: Pin<&crate::items::BorderRectangle>, _: &ItemRc) {
|
|
let geom = LogicalRect::new(LogicalPoint::default(), rect.logical_geometry().size_length());
|
|
if self.should_draw(&geom) {
|
|
let border = rect.border_width();
|
|
let radius = rect.border_radius();
|
|
// FIXME: gradients
|
|
let color = rect.background().color();
|
|
if radius > 0 as _ {
|
|
let radius = LogicalLength::new(radius)
|
|
.min(geom.width_length() / 2 as Coord)
|
|
.min(geom.height_length() / 2 as Coord);
|
|
if let Some(clipped) = geom.intersection(&self.current_state.clip) {
|
|
let geom2 = geom.cast() * self.scale_factor;
|
|
let clipped2 = clipped.cast() * self.scale_factor;
|
|
// Add a small value to make sure that the clip is always positive despite floating point shenanigans
|
|
const E: f32 = 0.00001;
|
|
self.processor.process_rounded_rectangle(
|
|
(clipped.translate(self.current_state.offset.to_vector()).cast()
|
|
* self.scale_factor)
|
|
.round()
|
|
.cast(),
|
|
RoundedRectangle {
|
|
radius: (radius.cast() * self.scale_factor).cast(),
|
|
width: (LogicalLength::new(border).cast() * self.scale_factor).cast(),
|
|
border_color: rect.border_color().color().into(),
|
|
inner_color: color.into(),
|
|
top_clip: PhysicalLength::new(
|
|
(clipped2.min_y() - geom2.min_y() + E) as _,
|
|
),
|
|
bottom_clip: PhysicalLength::new(
|
|
(geom2.max_y() - clipped2.max_y() + E) as _,
|
|
),
|
|
left_clip: PhysicalLength::new(
|
|
(clipped2.min_x() - geom2.min_x() + E) as _,
|
|
),
|
|
right_clip: PhysicalLength::new(
|
|
(geom2.max_x() - clipped2.max_x() + E) as _,
|
|
),
|
|
},
|
|
);
|
|
}
|
|
return;
|
|
}
|
|
|
|
if color.alpha() > 0 {
|
|
if let Some(r) =
|
|
geom.inflate(-border, -border).intersection(&self.current_state.clip)
|
|
{
|
|
self.processor.process_rectangle(
|
|
(r.translate(self.current_state.offset.to_vector()).cast()
|
|
* self.scale_factor)
|
|
.round()
|
|
.cast(),
|
|
color,
|
|
);
|
|
}
|
|
}
|
|
if border > 0.01 as Coord {
|
|
// FIXME: radius
|
|
// FIXME: gradients
|
|
let border_color = rect.border_color().color();
|
|
if border_color.alpha() > 0 {
|
|
let mut add_border = |r: LogicalRect| {
|
|
if let Some(r) = r.intersection(&self.current_state.clip) {
|
|
self.processor.process_rectangle(
|
|
(r.translate(self.current_state.offset.to_vector()).cast()
|
|
* self.scale_factor)
|
|
.round()
|
|
.cast(),
|
|
border_color,
|
|
);
|
|
}
|
|
};
|
|
let b = border;
|
|
add_border(euclid::rect(0 as _, 0 as _, geom.width(), b));
|
|
add_border(euclid::rect(0 as _, geom.height() - b, geom.width(), b));
|
|
add_border(euclid::rect(0 as _, b, b, geom.height() - b - b));
|
|
add_border(euclid::rect(geom.width() - b, b, b, geom.height() - b - b));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn draw_image(&mut self, image: Pin<&crate::items::ImageItem>, _: &ItemRc) {
|
|
let geom =
|
|
LogicalRect::new(LogicalPoint::default(), image.logical_geometry().size_length());
|
|
if self.should_draw(&geom) {
|
|
let source = image.source();
|
|
self.draw_image_impl(
|
|
geom,
|
|
&source,
|
|
euclid::Rect::new(Default::default(), source.size().cast()),
|
|
image.image_fit(),
|
|
Default::default(),
|
|
);
|
|
}
|
|
}
|
|
|
|
fn draw_clipped_image(&mut self, image: Pin<&crate::items::ClippedImage>, _: &ItemRc) {
|
|
let geom =
|
|
LogicalRect::new(LogicalPoint::default(), image.logical_geometry().size_length());
|
|
if self.should_draw(&geom) {
|
|
let source = image.source();
|
|
|
|
let source_clip_x = image.source_clip_x();
|
|
let source_clip_y = image.source_clip_y();
|
|
let source_size = source.size();
|
|
let mut source_clip_width = image.source_clip_width();
|
|
// when the source_clip size is empty, make it full
|
|
if source_clip_width == 0 {
|
|
source_clip_width = source_size.width as i32 - source_clip_x;
|
|
}
|
|
let mut source_clip_height = image.source_clip_height();
|
|
if source_clip_height == 0 {
|
|
source_clip_height = source_size.height as i32 - source_clip_y;
|
|
}
|
|
|
|
self.draw_image_impl(
|
|
geom,
|
|
&source,
|
|
euclid::rect(source_clip_x, source_clip_y, source_clip_width, source_clip_height),
|
|
image.image_fit(),
|
|
image.colorize().color(),
|
|
);
|
|
}
|
|
}
|
|
|
|
fn draw_text(&mut self, text: Pin<&crate::items::Text>, _: &ItemRc) {
|
|
let string = text.text();
|
|
if string.trim().is_empty() {
|
|
return;
|
|
}
|
|
let geom = LogicalRect::new(LogicalPoint::default(), text.logical_geometry().size_length());
|
|
if !self.should_draw(&geom) {
|
|
return;
|
|
}
|
|
|
|
let font_request = text.font_request(self.window);
|
|
let font = fonts::match_font(&font_request, self.scale_factor);
|
|
let layout = fonts::text_layout_for_font(&font, &font_request, self.scale_factor);
|
|
|
|
let color = text.color().color();
|
|
let max_size = (geom.size.cast() * self.scale_factor).cast();
|
|
|
|
let paragraph = TextParagraphLayout {
|
|
string: &string,
|
|
layout,
|
|
max_width: max_size.width_length(),
|
|
max_height: max_size.height_length(),
|
|
horizontal_alignment: text.horizontal_alignment(),
|
|
vertical_alignment: text.vertical_alignment(),
|
|
wrap: text.wrap(),
|
|
overflow: text.overflow(),
|
|
single_line: false,
|
|
};
|
|
|
|
// Clip glyphs not only against the global clip but also against the Text's geometry to avoid drawing outside
|
|
// of its boundaries (that breaks partial rendering and the cast to usize for the item relative coordinate below).
|
|
// FIXME: we should allow drawing outside of the Text element's boundaries.
|
|
let physical_clip = if let Some(logical_clip) = self.current_state.clip.intersection(&geom)
|
|
{
|
|
logical_clip.cast() * self.scale_factor
|
|
} else {
|
|
return; // This should have been caught earlier already
|
|
};
|
|
let offset = self.current_state.offset.to_vector().cast() * self.scale_factor;
|
|
|
|
paragraph.layout_lines(|glyphs, line_x, line_y| {
|
|
let baseline_y = line_y + font.ascent();
|
|
while let Some(positioned_glyph) = glyphs.next() {
|
|
let src_rect = PhysicalRect::new(
|
|
PhysicalPoint::from_lengths(
|
|
line_x + positioned_glyph.x + positioned_glyph.platform_glyph.x(),
|
|
baseline_y
|
|
- positioned_glyph.platform_glyph.y()
|
|
- positioned_glyph.platform_glyph.height(),
|
|
),
|
|
positioned_glyph.platform_glyph.size(),
|
|
)
|
|
.cast();
|
|
|
|
if let Some(clipped_src) = src_rect.intersection(&physical_clip) {
|
|
let geometry = clipped_src.translate(offset).round();
|
|
let origin = (geometry.origin - offset.round()).cast::<usize>();
|
|
let actual_x = origin.x - src_rect.origin.x as usize;
|
|
let actual_y = origin.y - src_rect.origin.y as usize;
|
|
let stride = positioned_glyph.platform_glyph.width().get() as u16;
|
|
let geometry = geometry.cast();
|
|
self.processor.process_texture(
|
|
geometry,
|
|
SceneTexture {
|
|
data: &positioned_glyph.platform_glyph.data().as_slice()
|
|
[actual_x + actual_y * stride as usize..],
|
|
stride,
|
|
source_size: geometry.size,
|
|
format: PixelFormat::AlphaMap,
|
|
color,
|
|
},
|
|
);
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
fn draw_text_input(&mut self, text_input: Pin<&crate::items::TextInput>, _: &ItemRc) {
|
|
text_input.logical_geometry();
|
|
// TODO
|
|
}
|
|
|
|
#[cfg(feature = "std")]
|
|
fn draw_path(&mut self, path: Pin<&crate::items::Path>, _: &ItemRc) {
|
|
path.logical_geometry();
|
|
// TODO
|
|
}
|
|
|
|
fn draw_box_shadow(&mut self, box_shadow: Pin<&crate::items::BoxShadow>, _: &ItemRc) {
|
|
box_shadow.logical_geometry();
|
|
// TODO
|
|
}
|
|
|
|
fn combine_clip(&mut self, other: RectF, _radius: Coord, _border_width: Coord) -> bool {
|
|
match self.current_state.clip.intersection(&LogicalRect::from_untyped(&other)) {
|
|
Some(r) => {
|
|
self.current_state.clip = r;
|
|
true
|
|
}
|
|
None => {
|
|
self.current_state.clip = LogicalRect::default();
|
|
false
|
|
}
|
|
}
|
|
// TODO: handle radius and border
|
|
}
|
|
|
|
fn get_current_clip(&self) -> crate::graphics::Rect {
|
|
self.current_state.clip.to_untyped()
|
|
}
|
|
|
|
fn translate(&mut self, x: Coord, y: Coord) {
|
|
self.current_state.offset.x += x;
|
|
self.current_state.offset.y += y;
|
|
self.current_state.clip = self.current_state.clip.translate((-x, -y).into())
|
|
}
|
|
|
|
fn rotate(&mut self, _angle_in_degrees: f32) {
|
|
todo!()
|
|
}
|
|
|
|
fn apply_opacity(&mut self, opacity: f32) {
|
|
self.current_state.alpha *= opacity;
|
|
}
|
|
|
|
fn save_state(&mut self) {
|
|
self.state_stack.push(self.current_state);
|
|
}
|
|
|
|
fn restore_state(&mut self) {
|
|
self.current_state = self.state_stack.pop().unwrap();
|
|
}
|
|
|
|
fn scale_factor(&self) -> f32 {
|
|
self.scale_factor.0
|
|
}
|
|
|
|
fn draw_cached_pixmap(
|
|
&mut self,
|
|
_: &ItemRc,
|
|
_update_fn: &dyn Fn(&mut dyn FnMut(u32, u32, &[u8])),
|
|
) {
|
|
todo!()
|
|
}
|
|
|
|
fn draw_string(&mut self, _string: &str, _color: Color) {
|
|
todo!()
|
|
}
|
|
|
|
fn window(&self) -> &crate::api::Window {
|
|
unreachable!("this backend don't query the window")
|
|
}
|
|
|
|
fn as_any(&mut self) -> Option<&mut dyn core::any::Any> {
|
|
None
|
|
}
|
|
}
|
|
|
|
/// This is a minimal adaptor for a Window that doesn't have any other feature than rendering
|
|
/// using the software renderer.
|
|
///
|
|
/// The [`MAX_BUFFER_AGE`](SoftwareRenderer#max_buffer_age) generic parameter is forwarded to
|
|
/// the [`SoftwareRenderer`]
|
|
pub struct MinimalSoftwareWindow<const MAX_BUFFER_AGE: usize> {
|
|
window: Window,
|
|
renderer: SoftwareRenderer<MAX_BUFFER_AGE>,
|
|
needs_redraw: Cell<bool>,
|
|
}
|
|
|
|
impl<const MAX_BUFFER_AGE: usize> MinimalSoftwareWindow<MAX_BUFFER_AGE> {
|
|
/// Instantiate a new MinimalWindowAdaptor
|
|
pub fn new() -> Rc<Self> {
|
|
Rc::new_cyclic(|w: &Weak<Self>| Self {
|
|
window: Window::new(w.clone()),
|
|
renderer: SoftwareRenderer::new(w.clone()),
|
|
needs_redraw: Default::default(),
|
|
})
|
|
}
|
|
/// If the window needs to be redrawn, the callback will be called with the
|
|
/// [renderer](SoftwareRenderer) that should be used to do the drawing.
|
|
///
|
|
/// [`SoftwareRenderer::render()`] or [`SoftwareRenderer::render_by_line()`] should be called
|
|
/// in that callback.
|
|
///
|
|
/// Return true if something was redrawn.
|
|
pub fn draw_if_needed(
|
|
&self,
|
|
render_callback: impl FnOnce(&SoftwareRenderer<MAX_BUFFER_AGE>),
|
|
) -> bool {
|
|
if self.needs_redraw.replace(false) {
|
|
render_callback(&self.renderer);
|
|
true
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<const MAX_BUFFER_AGE: usize> crate::window::WindowAdapterSealed
|
|
for MinimalSoftwareWindow<MAX_BUFFER_AGE>
|
|
{
|
|
fn request_redraw(&self) {
|
|
self.needs_redraw.set(true);
|
|
}
|
|
fn renderer(&self) -> &dyn Renderer {
|
|
&self.renderer
|
|
}
|
|
}
|
|
|
|
impl<const MAX_BUFFER_AGE: usize> WindowAdapter for MinimalSoftwareWindow<MAX_BUFFER_AGE> {
|
|
fn window(&self) -> &Window {
|
|
&self.window
|
|
}
|
|
}
|
|
|
|
impl<const MAX_BUFFER_AGE: usize> core::ops::Deref for MinimalSoftwareWindow<MAX_BUFFER_AGE> {
|
|
type Target = Window;
|
|
fn deref(&self) -> &Self::Target {
|
|
&self.window
|
|
}
|
|
}
|