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80830bbece
The LineRenderer is going to be a public type which can be used by the MCU board support to draw. Right now, it is used by the old code
839 lines
32 KiB
Rust
839 lines
32 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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mod draw_functions;
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use crate::lengths::PhysicalPx;
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use crate::{
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LogicalItemGeometry, LogicalLength, LogicalPoint, LogicalRect, PhysicalLength, PhysicalPoint,
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PhysicalRect, PhysicalSize, PointLengths, RectLengths, ScaleFactor, SizeLengths,
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};
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use alloc::rc::Rc;
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use alloc::{vec, vec::Vec};
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use core::pin::Pin;
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pub use draw_functions::TargetPixel;
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use embedded_graphics::pixelcolor::Rgb888;
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use i_slint_core::graphics::{FontRequest, IntRect, PixelFormat, Rect as RectF};
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use i_slint_core::item_rendering::{ItemRenderer, PartialRenderingCache};
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use i_slint_core::items::ImageFit;
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use i_slint_core::textlayout::{FontMetrics as _, TextParagraphLayout};
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use i_slint_core::{Color, Coord, ImageInner, StaticTextures};
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type DirtyRegion = PhysicalRect;
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pub trait LineBufferProvider {
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/// Called before the frame is being drawn, with the dirty region. Return the actual dirty region
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///
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/// The default implementation simply returns the dirty_region
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fn set_dirty_region(&mut self, dirty_region: PhysicalRect) -> PhysicalRect {
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dirty_region
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}
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/// Called once per line, you will have to call the render_fn back with the buffer.
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fn process_line(
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&mut self,
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line: PhysicalLength,
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render_fn: impl FnOnce(&mut [super::TargetPixel]),
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);
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}
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#[derive(Default)]
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pub struct LineRenderer {
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partial_cache: i_slint_core::item_rendering::PartialRenderingCache,
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}
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impl LineRenderer {
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/// Render the window, line by line, into the buffer provided by the `line_buffer` 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. The `initial_dirty_region` is an extra dirty regin which will also
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/// be rendered.
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///
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/// TODO: the window should be the public slint::Window type
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/// TODO: what about async and threading.
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/// (can we call the line_buffer function from different thread?)
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/// TODO: should `initial_dirty_region` be set from a different call?
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pub fn render(
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&mut self,
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window: Rc<i_slint_core::window::Window>,
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initial_dirty_region: i_slint_core::item_rendering::DirtyRegion,
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line_buffer: impl LineBufferProvider,
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) {
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let component_rc = window.component();
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let component = i_slint_core::component::ComponentRc::borrow_pin(&component_rc);
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if let Some(window_item) = i_slint_core::items::ItemRef::downcast_pin::<
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i_slint_core::items::WindowItem,
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>(component.as_ref().get_item_ref(0))
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{
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let size = euclid::size2(window_item.width() as f32, window_item.height() as f32)
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* ScaleFactor::new(window.scale_factor());
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let background = to_rgb888_color_discard_alpha(window_item.background());
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render_window_frame(
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window,
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background.into(),
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size.cast(),
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initial_dirty_region,
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&mut self.partial_cache,
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line_buffer,
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);
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}
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}
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pub fn free_graphics_resources(
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&mut self,
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items: &mut dyn Iterator<Item = Pin<i_slint_core::items::ItemRef<'_>>>,
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) {
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for item in items {
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let cache_entry = item.cached_rendering_data_offset().release(&mut self.partial_cache);
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drop(cache_entry);
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}
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}
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}
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fn render_window_frame(
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runtime_window: Rc<i_slint_core::window::Window>,
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background: super::TargetPixel,
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size: PhysicalSize,
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initial_dirty_region: i_slint_core::item_rendering::DirtyRegion,
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cache: &mut PartialRenderingCache,
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mut line_buffer: impl LineBufferProvider,
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) {
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let mut scene =
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prepare_scene(runtime_window, size, initial_dirty_region, &mut line_buffer, cache);
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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(scene.current_line, |line_buffer| {
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line_buffer[dirty_region.min_x() as usize..dirty_region.max_x() as usize]
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.fill(background);
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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!(scene.current_line < span.pos.y_length() + span.size.height_length(),);
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match span.command {
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SceneCommand::Rectangle { color } => {
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TargetPixel::blend_buffer(
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&mut line_buffer[span.pos.x as usize
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..(span.pos.x_length() + span.size.width_length()).get() as usize],
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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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span,
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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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span,
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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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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>,
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rounded_rectangles: Vec<RoundedRectangle>,
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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>,
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rounded_rectangles: Vec<RoundedRectangle>,
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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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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 {
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tmp1 = self.current_items_index;
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tmp2 = self.current_items_index;
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}
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break self.items[idx];
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}
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} else if j < self.current_items_index {
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let item = &self.items[j];
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if item.pos.y_length() + item.size.height_length() <= self.current_line {
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j += 1;
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continue;
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}
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if future_next_z.map_or(true, |z| item.z > z) {
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j += 1;
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break *item;
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}
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}
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if future_next_z.is_some() {
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self.future_items_index += 1;
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break self.items[self.future_items_index - 1];
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}
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break 'outer;
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};
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if i != j {
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// there is room
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} else if j >= self.current_items_index && tmp1 == tmp2 {
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// the current_items list is empty
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j += 1
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} else if self.items[j].pos.y_length() + self.items[j].size.height_length()
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<= self.current_line
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{
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// next item in the current_items array is no longer in this line
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j += 1;
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} else if tmp2 < self.future_items_index && j < self.current_items_index {
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// move the next item in current_items
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let to_move = self.items[j];
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self.items[tmp2] = to_move;
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j += 1;
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tmp2 += 1;
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} else {
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debug_assert!(tmp1 >= self.current_items_index);
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let sort_begin = i;
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// merge sort doesn't work because we don't have enough tmp space, just bring all items and use a normal sort.
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while j < self.current_items_index {
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let item = self.items[j];
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if item.pos.y_length() + item.size.height_length() > self.current_line {
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self.items[i] = item;
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i += 1;
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}
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j += 1;
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}
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self.items.copy_within(tmp1..tmp2, i);
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i += tmp2 - tmp1;
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debug_assert!(i < self.future_items_index);
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self.items[i] = item;
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i += 1;
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while self.future_items_index < self.items.len() {
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let item = self.items[self.future_items_index];
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if item.pos.y_length() > self.current_line {
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break;
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}
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self.items[i] = item;
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i += 1;
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self.future_items_index += 1;
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}
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self.items[sort_begin..i].sort_unstable_by(|a, b| b.z.cmp(&a.z));
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break;
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}
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self.items[i] = item;
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i += 1;
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}
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self.current_items_index = i;
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// check that current items are properly sorted
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debug_assert!(self.items[0..self.current_items_index].windows(2).all(|x| x[0].z >= x[1].z));
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}
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}
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#[derive(Clone, Copy, Debug)]
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struct SceneItem {
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pos: PhysicalPoint,
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size: PhysicalSize,
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// this is the order of the item from which it is in the item tree
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z: u16,
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command: SceneCommand,
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}
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fn compare_scene_item(a: &SceneItem, b: &SceneItem) -> core::cmp::Ordering {
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// First, order by line (top to bottom)
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match a.pos.y.partial_cmp(&b.pos.y) {
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None | Some(core::cmp::Ordering::Equal) => {}
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Some(ord) => return ord,
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}
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// Then by the reverse z (front to back)
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match a.z.partial_cmp(&b.z) {
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None | Some(core::cmp::Ordering::Equal) => {}
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Some(ord) => return ord.reverse(),
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}
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// anything else, we don't care
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core::cmp::Ordering::Equal
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}
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#[derive(Clone, Copy, Debug)]
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#[repr(u8)]
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enum SceneCommand {
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Rectangle {
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color: Color,
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},
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/// texture_index is an index in the Scene::textures array
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Texture {
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texture_index: u16,
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},
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/// rectangle_index is an index in the Scene::rounded_rectangle array
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RoundedRectangle {
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rectangle_index: u16,
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},
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}
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struct SceneTexture {
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data: &'static [u8],
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format: PixelFormat,
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/// bytes between two lines in the source
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stride: u16,
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source_size: PhysicalSize,
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color: Color,
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}
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#[derive(Debug)]
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struct RoundedRectangle {
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radius: PhysicalLength,
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/// the border's width
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width: PhysicalLength,
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border_color: Color,
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inner_color: Color,
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/// The clips is the amount of pixels of the rounded rectangle that is clipped away.
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/// For example, if left_clip > width, then the left border will not be visible, and
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/// if left_clip > radius, then no radius will be seen in the left side
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left_clip: PhysicalLength,
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right_clip: PhysicalLength,
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top_clip: PhysicalLength,
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bottom_clip: PhysicalLength,
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}
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fn prepare_scene(
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runtime_window: Rc<i_slint_core::window::Window>,
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size: PhysicalSize,
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initial_dirty_region: i_slint_core::item_rendering::DirtyRegion,
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line_buffer: &mut impl LineBufferProvider,
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cache: &mut PartialRenderingCache,
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) -> Scene {
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let factor = ScaleFactor::new(runtime_window.scale_factor());
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let prepare_scene = PrepareScene::new(size, factor, runtime_window.default_font_properties());
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let mut renderer = i_slint_core::item_rendering::PartialRenderer::new(
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cache,
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initial_dirty_region,
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prepare_scene,
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);
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let mut dirty_region = PhysicalRect::default();
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runtime_window.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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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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.intersection(&PhysicalRect { origin: euclid::point2(0, 0), size })
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.unwrap_or_default();
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dirty_region = line_buffer.set_dirty_region(dirty_region);
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renderer.combine_clip((dirty_region.cast() / factor).to_untyped().cast(), 0 as _, 0 as _);
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for (component, origin) in components {
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i_slint_core::item_rendering::render_component_items(component, &mut renderer, *origin);
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}
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});
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let prepare_scene = renderer.into_inner();
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Scene::new(
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prepare_scene.items,
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prepare_scene.textures,
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prepare_scene.rounded_rectangles,
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dirty_region,
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)
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}
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struct PrepareScene {
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items: Vec<SceneItem>,
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textures: Vec<SceneTexture>,
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rounded_rectangles: Vec<RoundedRectangle>,
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state_stack: Vec<RenderState>,
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current_state: RenderState,
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scale_factor: ScaleFactor,
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default_font: FontRequest,
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}
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impl PrepareScene {
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fn new(size: PhysicalSize, scale_factor: ScaleFactor, default_font: FontRequest) -> Self {
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Self {
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items: vec![],
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rounded_rectangles: vec![],
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textures: vec![],
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state_stack: vec![],
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current_state: RenderState {
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alpha: 1.,
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offset: LogicalPoint::default(),
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clip: LogicalRect::new(
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LogicalPoint::default(),
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(size.cast() / scale_factor).cast(),
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),
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},
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scale_factor,
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default_font,
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}
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}
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fn should_draw(&self, rect: &LogicalRect) -> bool {
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!rect.size.is_empty()
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&& self.current_state.alpha > 0.01
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&& self.current_state.clip.intersects(rect)
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}
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fn new_scene_texture(&mut self, geometry: PhysicalRect, texture: SceneTexture) {
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let size = geometry.size;
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if !size.is_empty() {
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let texture_index = self.textures.len() as u16;
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self.textures.push(texture);
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self.items.push(SceneItem {
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pos: geometry.origin,
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size,
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z: self.items.len() as u16,
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command: SceneCommand::Texture { texture_index },
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});
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}
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}
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fn new_scene_item(&mut self, geometry: LogicalRect, command: SceneCommand) {
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let geometry = (geometry.translate(self.current_state.offset.to_vector()).cast()
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* self.scale_factor)
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.round()
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.cast();
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let size = geometry.size;
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if !size.is_empty() {
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let z = self.items.len() as u16;
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let pos = geometry.origin;
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self.items.push(SceneItem { pos, size, z, command });
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}
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}
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fn draw_image_impl(
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&mut self,
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geom: LogicalRect,
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source: &i_slint_core::graphics::Image,
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mut source_clip: IntRect,
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image_fit: ImageFit,
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colorize: Color,
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) {
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let image_inner: &ImageInner = source.into();
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match image_inner {
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ImageInner::None => (),
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ImageInner::AbsoluteFilePath(_) | ImageInner::EmbeddedData { .. } => {
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unimplemented!()
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}
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ImageInner::EmbeddedImage(_) => todo!(),
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|
ImageInner::StaticTextures(StaticTextures { size, data, textures, .. }) => {
|
|
let phys_size = geom.size_length().cast() * self.scale_factor;
|
|
let sx = phys_size.width / (size.width as f32);
|
|
let sy = phys_size.height / (size.height as f32);
|
|
let mut image_fit_offset = euclid::Vector2D::default();
|
|
let (sx, sy) = match image_fit {
|
|
ImageFit::fill => (sx, sy),
|
|
ImageFit::cover => {
|
|
let ratio = f32::max(sx, sy);
|
|
if size.width as f32 > phys_size.width / ratio {
|
|
let diff = (size.width as f32 - phys_size.width / ratio) as i32;
|
|
source_clip.origin.x += diff / 2;
|
|
source_clip.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_clip.origin.y += diff / 2;
|
|
source_clip.size.height -= diff;
|
|
}
|
|
(ratio, ratio)
|
|
}
|
|
ImageFit::contain => {
|
|
let ratio = f32::min(sx, sy);
|
|
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 scaled_clip =
|
|
(self.current_state.clip.cast() * self.scale_factor).scale(1. / sx, 1. / sy);
|
|
for t in textures.as_slice() {
|
|
if let Some(clipped_src) = t.rect.intersection(&source_clip).and_then(|r| {
|
|
euclid::Rect::<_, PhysicalPx>::from_untyped(&r.cast())
|
|
.intersection(&scaled_clip)
|
|
}) {
|
|
let geometry = clipped_src.scale(sx, sy).translate(offset).round();
|
|
let actual_x = clipped_src.origin.x as usize - t.rect.origin.x as usize;
|
|
let actual_y = clipped_src.origin.y as usize - t.rect.origin.y as usize;
|
|
let stride = t.rect.width() as u16 * bpp(t.format);
|
|
self.new_scene_texture(
|
|
geometry.cast(),
|
|
SceneTexture {
|
|
data: &data.as_slice()[(t.index
|
|
+ (stride as usize) * actual_y
|
|
+ (bpp(t.format) as usize) * actual_x)..],
|
|
stride,
|
|
source_size: clipped_src.size.ceil().cast(),
|
|
format: t.format,
|
|
color: if colorize.alpha() > 0 { colorize } else { t.color },
|
|
},
|
|
);
|
|
}
|
|
}
|
|
}
|
|
};
|
|
}
|
|
}
|
|
|
|
#[derive(Clone, Copy)]
|
|
struct RenderState {
|
|
alpha: f32,
|
|
offset: LogicalPoint,
|
|
clip: LogicalRect,
|
|
}
|
|
|
|
impl i_slint_core::item_rendering::ItemRenderer for PrepareScene {
|
|
fn draw_rectangle(&mut self, rect: Pin<&i_slint_core::items::Rectangle>) {
|
|
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.new_scene_item(geom, SceneCommand::Rectangle { color: color });
|
|
}
|
|
}
|
|
|
|
fn draw_border_rectangle(&mut self, rect: Pin<&i_slint_core::items::BorderRectangle>) {
|
|
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;
|
|
let rectangle_index = self.rounded_rectangles.len() as u16;
|
|
// Add a small value to make sure that the clip is always positive despite floating point shenanigans
|
|
const E: f32 = 0.00001;
|
|
self.rounded_rectangles.push(RoundedRectangle {
|
|
radius: (radius.cast() * self.scale_factor).cast(),
|
|
width: (LogicalLength::new(border).cast() * self.scale_factor).cast(),
|
|
border_color: rect.border_color().color(),
|
|
inner_color: color,
|
|
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 _,
|
|
),
|
|
});
|
|
self.new_scene_item(
|
|
clipped,
|
|
SceneCommand::RoundedRectangle { rectangle_index },
|
|
);
|
|
}
|
|
return;
|
|
}
|
|
|
|
if color.alpha() > 0 {
|
|
if let Some(r) =
|
|
geom.inflate(-border, -border).intersection(&self.current_state.clip)
|
|
{
|
|
self.new_scene_item(r, SceneCommand::Rectangle { 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.new_scene_item(r, SceneCommand::Rectangle { color: 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<&i_slint_core::items::ImageItem>) {
|
|
let geom =
|
|
LogicalRect::new(LogicalPoint::default(), image.logical_geometry().size_length());
|
|
if self.should_draw(&geom) {
|
|
self.draw_image_impl(
|
|
geom,
|
|
&image.source(),
|
|
euclid::rect(0, 0, i32::MAX, i32::MAX),
|
|
image.image_fit(),
|
|
Default::default(),
|
|
);
|
|
}
|
|
}
|
|
|
|
fn draw_clipped_image(&mut self, image: Pin<&i_slint_core::items::ClippedImage>) {
|
|
// when the source_clip size is empty, make it full
|
|
let a = |v| if v == 0 { i32::MAX } else { v };
|
|
|
|
let geom =
|
|
LogicalRect::new(LogicalPoint::default(), image.logical_geometry().size_length());
|
|
if self.should_draw(&geom) {
|
|
self.draw_image_impl(
|
|
geom,
|
|
&image.source(),
|
|
euclid::rect(
|
|
image.source_clip_x(),
|
|
image.source_clip_y(),
|
|
a(image.source_clip_width()),
|
|
a(image.source_clip_height()),
|
|
),
|
|
image.image_fit(),
|
|
image.colorize().color(),
|
|
);
|
|
}
|
|
}
|
|
|
|
fn draw_text(&mut self, text: Pin<&i_slint_core::items::Text>) {
|
|
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.unresolved_font_request().merge(&self.default_font);
|
|
let font = crate::fonts::match_font(&font_request, self.scale_factor);
|
|
let layout = crate::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,
|
|
};
|
|
|
|
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(&(self.current_state.clip.cast() * self.scale_factor))
|
|
{
|
|
let offset = self.current_state.offset.to_vector().cast() * self.scale_factor;
|
|
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.new_scene_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<&i_slint_core::items::TextInput>) {
|
|
text_input.logical_geometry();
|
|
// TODO
|
|
}
|
|
|
|
#[cfg(feature = "std")]
|
|
fn draw_path(&mut self, path: Pin<&i_slint_core::items::Path>) {
|
|
path.logical_geometry();
|
|
// TODO
|
|
}
|
|
|
|
fn draw_box_shadow(&mut self, box_shadow: Pin<&i_slint_core::items::BoxShadow>) {
|
|
box_shadow.logical_geometry();
|
|
// TODO
|
|
}
|
|
|
|
fn combine_clip(&mut self, other: RectF, _radius: Coord, _border_width: Coord) {
|
|
match self.current_state.clip.intersection(&LogicalRect::from_untyped(&other)) {
|
|
Some(r) => {
|
|
self.current_state.clip = r;
|
|
}
|
|
None => {
|
|
self.current_state.clip = LogicalRect::default();
|
|
}
|
|
};
|
|
// TODO: handle radius and border
|
|
}
|
|
|
|
fn get_current_clip(&self) -> i_slint_core::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,
|
|
_item_cache: &i_slint_core::item_rendering::CachedRenderingData,
|
|
_update_fn: &dyn Fn(&mut dyn FnMut(u32, u32, &[u8])),
|
|
) {
|
|
todo!()
|
|
}
|
|
|
|
fn draw_string(&mut self, _string: &str, _color: Color) {
|
|
todo!()
|
|
}
|
|
|
|
fn window(&self) -> i_slint_core::window::WindowRc {
|
|
unreachable!("this backend don't query the window")
|
|
}
|
|
|
|
fn as_any(&mut self) -> &mut dyn core::any::Any {
|
|
self
|
|
}
|
|
}
|
|
|
|
/// bytes per pixels
|
|
fn bpp(format: PixelFormat) -> u16 {
|
|
match format {
|
|
PixelFormat::Rgb => 3,
|
|
PixelFormat::Rgba => 4,
|
|
PixelFormat::AlphaMap => 1,
|
|
}
|
|
}
|
|
|
|
pub fn to_rgb888_color_discard_alpha(col: Color) -> Rgb888 {
|
|
Rgb888::new(col.red(), col.green(), col.blue())
|
|
}
|