// Copyright © SixtyFPS GmbH <info@slint.dev>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-2.0 OR LicenseRef-Slint-Software-3.0

// cSpell: ignore rrect skpath

use std::pin::Pin;

use super::{PhysicalBorderRadius, PhysicalLength, PhysicalPoint, PhysicalRect, PhysicalSize};
use i_slint_core::graphics::ApproxEq;
use i_slint_core::graphics::boxshadowcache::BoxShadowCache;
use i_slint_core::graphics::euclid::num::Zero;
use i_slint_core::graphics::euclid::{self, Vector2D};
use i_slint_core::item_rendering::{
    CachedRenderingData, ItemCache, ItemRenderer, ItemRendererFeatures, LayerRenderer, RenderImage,
    RenderText,
};
use i_slint_core::items::{ImageFit, ImageRendering, ItemRc, Layer, Opacity, RenderingResult};
use i_slint_core::lengths::{
    LogicalBorderRadius, LogicalLength, LogicalPoint, LogicalPx, LogicalRect, LogicalSize,
    LogicalVector, PhysicalPx, RectLengths, ScaleFactor, SizeLengths, logical_size_from_api,
};
use i_slint_core::textlayout::sharedparley::{self, GlyphRenderer, fontique};
use i_slint_core::window::WindowInner;
use i_slint_core::{Brush, Color, SharedString};
use skia_safe::{Matrix, TileMode};

pub type SkiaBoxShadowCache = BoxShadowCache<skia_safe::Image>;

#[derive(Clone, Copy)]
struct RenderState {
    alpha: f32,
    transform: i_slint_core::lengths::ItemTransform,
}

pub struct SkiaItemRenderer<'a> {
    pub canvas: &'a skia_safe::Canvas,
    pub scale_factor: ScaleFactor,
    pub window: &'a i_slint_core::api::Window,
    surface: Option<&'a dyn crate::Surface>,
    state_stack: Vec<RenderState>,
    current_state: RenderState,
    image_cache: &'a ItemCache<Option<skia_safe::Image>>,
    layer_cache: &'a ItemCache<Option<(PhysicalPoint, skia_safe::Image)>>,
    path_cache: &'a ItemCache<Option<(Vector2D<f32, PhysicalPx>, skia_safe::Path)>>,
    text_layout_cache: &'a sharedparley::TextLayoutCache,
    box_shadow_cache: &'a mut SkiaBoxShadowCache,
}

impl<'a> SkiaItemRenderer<'a> {
    pub fn new(
        canvas: &'a skia_safe::Canvas,
        window: &'a i_slint_core::api::Window,
        surface: Option<&'a dyn crate::Surface>,
        image_cache: &'a ItemCache<Option<skia_safe::Image>>,
        layer_cache: &'a ItemCache<Option<(PhysicalPoint, skia_safe::Image)>>,
        path_cache: &'a ItemCache<Option<(Vector2D<f32, PhysicalPx>, skia_safe::Path)>>,
        text_layout_cache: &'a sharedparley::TextLayoutCache,
        box_shadow_cache: &'a mut SkiaBoxShadowCache,
    ) -> Self {
        Self {
            canvas,
            scale_factor: ScaleFactor::new(window.scale_factor()),
            window,
            surface,
            state_stack: Vec::new(),
            current_state: RenderState {
                alpha: 1.0,
                transform: i_slint_core::lengths::ItemTransform::identity(),
            },
            image_cache,
            layer_cache,
            path_cache,
            text_layout_cache,
            box_shadow_cache,
        }
    }

    fn default_paint(&self) -> Option<skia_safe::Paint> {
        if self.current_state.alpha.approx_eq(&1.0) {
            None
        } else {
            let mut paint = skia_safe::Paint::default();
            paint.set_alpha_f(self.current_state.alpha);
            Some(paint)
        }
    }

    fn render_drop_shadow_image(
        canvas: &skia_safe::Canvas,
        shadow_options: &i_slint_core::graphics::boxshadowcache::BoxShadowOptions,
    ) -> Option<skia_safe::Image> {
        let blur = shadow_options.blur.get();
        let spread = shadow_options.spread.get();

        let shape_w = (shadow_options.width.get() + 2. * spread).max(0.);
        let shape_h = (shadow_options.height.get() + 2. * spread).max(0.);
        if shape_w <= 0. || shape_h <= 0. {
            return None;
        }
        // CSS rule: outer corner radius after spread = max(0, r + spread).
        let shape_radius = (shadow_options.radius + PhysicalBorderRadius::new_uniform(spread))
            .max(Default::default());

        let canvas_size: skia_safe::Size = (shape_w + 2. * blur, shape_h + 2. * blur).into();

        let image_info = skia_safe::ImageInfo::new(
            canvas_size.to_ceil(),
            skia_safe::ColorType::RGBA8888,
            skia_safe::AlphaType::Premul,
            None,
        );

        // The shape is centered in the canvas with `blur` padding on all sides so the Gaussian blur
        // has room to fade out into transparency.
        let rounded_rect = to_skia_rrect(
            &PhysicalRect::new(PhysicalPoint::new(blur, blur), PhysicalSize::new(shape_w, shape_h)),
            &shape_radius,
        );

        let mut paint = skia_safe::Paint::default();
        paint.set_color(to_skia_color(&shadow_options.color));
        paint.set_anti_alias(true);
        if blur > 0. {
            paint.set_mask_filter(skia_safe::MaskFilter::blur(
                skia_safe::BlurStyle::Normal,
                blur / 2.,
                None,
            ));
        }

        let mut surface = canvas.new_surface(&image_info, None)?;
        let surface_canvas = surface.canvas();
        surface_canvas.clear(skia_safe::Color::TRANSPARENT);
        surface_canvas.draw_rrect(rounded_rect, &paint);
        Some(surface.image_snapshot())
    }

    fn render_inset_shadow_image(
        canvas: &skia_safe::Canvas,
        shadow_options: &i_slint_core::graphics::boxshadowcache::BoxShadowOptions,
    ) -> Option<skia_safe::Image> {
        let width = shadow_options.width.get();
        let height = shadow_options.height.get();
        if width < 1. || height < 1. {
            return None;
        }
        let blur = shadow_options.blur.get();
        let spread = shadow_options.spread.get();
        let radius = shadow_options.radius;
        let offset_x = shadow_options.offset_x_inset;
        let offset_y = shadow_options.offset_y_inset;

        // Image is sized to the rectangle's geometry; the geometry rrect serves as the clip so the
        // outer blurred edge stays hidden.
        let canvas_size = skia_safe::ISize::new(width.ceil() as i32, height.ceil() as i32);
        let image_info = skia_safe::ImageInfo::new(
            canvas_size,
            skia_safe::ColorType::RGBA8888,
            skia_safe::AlphaType::Premul,
            None,
        );

        let geometry_rrect = to_skia_rrect(
            &PhysicalRect::new(PhysicalPoint::zero(), PhysicalSize::new(width, height)),
            &radius,
        );

        // Inner "hole" rrect: geometry inset by spread on each side, translated by offset.
        // CSS: inner radius = max(0, radius - spread).
        let inner_rect = skia_safe::Rect::new(
            spread + offset_x,
            spread + offset_y,
            width - spread + offset_x,
            height - spread + offset_y,
        );
        let inner_radius =
            (radius - PhysicalBorderRadius::new_uniform(spread)).max(Default::default());
        let inner_rrect = to_skia_rrect(
            &PhysicalRect::new(
                PhysicalPoint::new(inner_rect.left, inner_rect.top),
                PhysicalSize::new(inner_rect.width(), inner_rect.height()),
            ),
            &inner_radius,
        );

        // Outer rect inflated well beyond the geometry so its blurred edge falls outside the clip.
        let inflate = blur + spread.abs() + offset_x.abs() + offset_y.abs() + 16.;
        let outer_rect =
            skia_safe::Rect::new(-inflate, -inflate, width + inflate, height + inflate);

        let mut path_builder = skia_safe::PathBuilder::new();
        path_builder.set_fill_type(skia_safe::PathFillType::EvenOdd);
        path_builder.add_rect(outer_rect, None, None);
        path_builder.add_rrect(inner_rrect, None, None);
        let path = path_builder.detach();

        let mut paint = skia_safe::Paint::default();
        paint.set_color(to_skia_color(&shadow_options.color));
        paint.set_anti_alias(true);
        if blur > 0. {
            paint.set_mask_filter(skia_safe::MaskFilter::blur(
                skia_safe::BlurStyle::Normal,
                blur / 2.,
                None,
            ));
        }

        let mut surface = canvas.new_surface(&image_info, None)?;
        let surface_canvas = surface.canvas();
        surface_canvas.clear(skia_safe::Color::TRANSPARENT);
        surface_canvas.clip_rrect(geometry_rrect, None, true);
        surface_canvas.draw_path(&path, &paint);
        Some(surface.image_snapshot())
    }

    fn brush_to_paint(
        &self,
        brush: Brush,
        width: PhysicalLength,
        height: PhysicalLength,
    ) -> Option<skia_safe::Paint> {
        let (mut paint, shader) = Self::brush_to_shader(
            self.default_paint().unwrap_or_default(),
            brush,
            width,
            height,
            self.scale_factor.get(),
        )?;
        paint.set_shader(Some(shader));

        Some(paint)
    }

    fn brush_to_shader(
        mut paint: skia_safe::Paint,
        brush: Brush,
        width: PhysicalLength,
        height: PhysicalLength,
        scale_factor: f32,
    ) -> Option<(skia_safe::Paint, skia_safe::Shader)> {
        if brush.is_transparent() {
            return None;
        }

        match brush {
            Brush::SolidColor(color) => Some(skia_safe::shaders::color(to_skia_color(&color))),

            Brush::LinearGradient(g) => {
                let (start, end) = i_slint_core::graphics::line_for_angle(
                    g.angle(),
                    [width.get(), height.get()].into(),
                );
                let (colors, pos): (Vec<skia_safe::Color4f>, Vec<_>) = g
                    .stops()
                    .map(|s| (skia_safe::Color4f::from(to_skia_color(&s.color)), s.position))
                    .unzip();

                paint.set_dither(true);

                let gradient_colors =
                    skia_safe::gradient::Colors::new(&colors, Some(&*pos), TileMode::Clamp, None);
                let gradient = skia_safe::gradient::Gradient::new(
                    gradient_colors,
                    skia_safe::gradient::Interpolation {
                        in_premul: skia_safe::gradient::interpolation::InPremul::Yes,
                        ..Default::default()
                    },
                );
                skia_safe::gradient::shaders::linear_gradient(
                    (skia_safe::Point::new(start.x, start.y), skia_safe::Point::new(end.x, end.y)),
                    &gradient,
                    None,
                )
            }
            Brush::RadialGradient(g) => {
                let (colors, pos): (Vec<skia_safe::Color4f>, Vec<_>) = g
                    .stops()
                    .map(|s| (skia_safe::Color4f::from(to_skia_color(&s.color)), s.position))
                    .unzip();
                let (cx, cy) = g.center_or_default_scaled(width.get(), height.get(), scale_factor);
                let circle_scale =
                    g.radius_or_default_scaled(width.get(), height.get(), scale_factor);

                paint.set_dither(true);

                let gradient_colors =
                    skia_safe::gradient::Colors::new(&colors, Some(&*pos), TileMode::Clamp, None);
                let gradient = skia_safe::gradient::Gradient::new(
                    gradient_colors,
                    skia_safe::gradient::Interpolation {
                        in_premul: skia_safe::gradient::interpolation::InPremul::Yes,
                        ..Default::default()
                    },
                );
                let mut local_matrix = skia_safe::Matrix::scale((circle_scale, circle_scale));
                local_matrix.post_translate((cx, cy));
                skia_safe::gradient::shaders::radial_gradient(
                    (skia_safe::Point::new(0., 0.), 1.),
                    &gradient,
                    &local_matrix,
                )
            }
            Brush::ConicGradient(g) => {
                let (colors, pos): (Vec<skia_safe::Color4f>, Vec<_>) = g
                    .stops()
                    .map(|s| (skia_safe::Color4f::from(to_skia_color(&s.color)), s.position))
                    .unzip();
                let (cx, cy) = g.center_or_default_scaled(width.get(), height.get(), scale_factor);

                paint.set_dither(true);

                // Skia's sweep gradient uses 0 degrees at 3 o'clock (east)
                // We want 0 degrees at 12 o'clock (north), so we need to rotate by -90 degrees
                let center = skia_safe::Point::new(cx, cy);
                let gradient_colors =
                    skia_safe::gradient::Colors::new(&colors, Some(&*pos), TileMode::Clamp, None);
                let gradient = skia_safe::gradient::Gradient::new(
                    gradient_colors,
                    skia_safe::gradient::Interpolation::default(),
                );
                skia_safe::gradient::shaders::sweep_gradient(
                    center,
                    (0.0, 360.0),
                    &gradient,
                    &skia_safe::Matrix::rotate_deg_pivot(-90.0, center),
                )
            }
            _ => None,
        }
        .map(|shader| (paint, shader))
    }

    fn colorize_image(
        &mut self,
        image: skia_safe::Image,
        colorize_brush: Brush,
    ) -> Option<skia_safe::Image> {
        let image_info = skia_safe::ImageInfo::new(
            image.dimensions(),
            skia_safe::ColorType::RGBA8888,
            skia_safe::AlphaType::Premul,
            None,
        );

        Self::brush_to_shader(
            skia_safe::Paint::default(), // Don't use the renderer's default paint because alpha is applied later
            colorize_brush,
            PhysicalLength::new(image.width() as f32),
            PhysicalLength::new(image.height() as f32),
            self.scale_factor.get(),
        )
        .map(|(mut paint, colorize_shader)| {
            let mut surface = self.canvas.new_surface(&image_info, None)?;
            let canvas = surface.canvas();
            canvas.clear(skia_safe::Color::TRANSPARENT);

            paint.set_image_filter(skia_safe::image_filters::blend(
                skia_safe::BlendMode::SrcIn,
                skia_safe::image_filters::image(image, None, None, None),
                skia_safe::image_filters::shader(colorize_shader, None),
                None,
            ));
            canvas.draw_paint(&paint);
            Some(surface.image_snapshot())
        })?
    }

    fn draw_image_impl(
        &mut self,
        item_rc: &ItemRc,
        item: Pin<&dyn RenderImage>,
        dest_rect: PhysicalRect,
    ) {
        let tiling = item.tiling();

        // TODO: avoid doing creating an SkImage multiple times when the same source is used in multiple image elements
        let skia_image = self.image_cache.get_or_update_cache_entry(item_rc, || {
            let image = item.source();
            super::cached_image::as_skia_image(
                image,
                &|| item.target_size(),
                if tiling != Default::default() { ImageFit::Preserve } else { item.image_fit() },
                self.scale_factor,
                self.canvas,
                self.surface,
            )
            .and_then(|skia_image| {
                let brush = item.colorize();
                if !brush.is_transparent() {
                    self.colorize_image(skia_image, brush)
                } else {
                    Some(skia_image)
                }
            })
        });

        let Some(skia_image) = skia_image else { return };
        let source = item.source();
        let source_size = source.size();
        if source_size.is_empty() {
            // Not sure how this can happen, but we've seen with #6280
            // that somehow we end up with a `skia_safe::Image` but a zero
            // source size.
            return;
        }
        let fits = if let i_slint_core::ImageInner::NineSlice(nine) =
            <&i_slint_core::ImageInner>::from(&source)
        {
            i_slint_core::graphics::fit9slice(
                source_size.cast(),
                nine.1,
                dest_rect.size,
                self.scale_factor,
                item.alignment(),
                tiling,
            )
            .collect::<Vec<_>>()
        } else {
            vec![i_slint_core::graphics::fit(
                item.image_fit(),
                dest_rect.size,
                item.source_clip().unwrap_or_else(|| euclid::Rect::from_size(source_size.cast())),
                self.scale_factor,
                item.alignment(),
                tiling,
            )]
        };

        let _saved_canvas = self.pixel_align_origin_auto_restore();
        for fit in fits {
            self.canvas.save();

            let dst = to_skia_rect(&PhysicalRect::new(fit.offset, fit.size));
            self.canvas.clip_rect(dst, None, None);
            let src = skia_safe::IRect::from_xywh(
                skia_image.width() * fit.clip_rect.origin.x / source_size.width as i32,
                skia_image.height() * fit.clip_rect.origin.y / source_size.height as i32,
                skia_image.width() * fit.clip_rect.size.width / source_size.width as i32,
                skia_image.height() * fit.clip_rect.size.height / source_size.height as i32,
            );

            let filter_mode: skia_safe::sampling_options::SamplingOptions =
                match item.rendering() {
                    ImageRendering::Pixelated => skia_safe::sampling_options::FilterMode::Nearest,
                    ImageRendering::Smooth | _ => skia_safe::sampling_options::FilterMode::Linear,
                }
                .into();

            if let Some(tiled_offset) = fit.tiled {
                let matrix = Matrix::translate(((fit.offset.x as i32), (fit.offset.y as i32)))
                    * Matrix::scale((
                        fit.source_to_target_x * source_size.width as f32
                            / skia_image.width() as f32,
                        fit.source_to_target_y * source_size.height as f32
                            / skia_image.height() as f32,
                    ))
                    * Matrix::translate((-(tiled_offset.x as i32), -(tiled_offset.y as i32)));
                if let Some(shader) = skia_image
                    .make_subset(
                        self.canvas
                            .recording_context()
                            .as_mut()
                            .map(|c| c.as_recorder() as &mut dyn skia_safe::Recorder),
                        src,
                        skia_safe::image::RequiredProperties::default(),
                    )
                    .and_then(|i| {
                        i.to_shader((TileMode::Repeat, TileMode::Repeat), filter_mode, &matrix)
                    })
                {
                    let mut paint = self.default_paint().unwrap_or_default();
                    paint.set_shader(shader);
                    self.canvas.draw_paint(&paint);
                }
            } else {
                let transform =
                    skia_safe::Matrix::rect_2_rect(skia_safe::Rect::from(src), dst, None)
                        .unwrap_or_default();
                self.canvas.concat(&transform);
                self.canvas.draw_image_with_sampling_options(
                    skia_image.clone(),
                    skia_safe::Point::default(),
                    filter_mode,
                    self.default_paint().as_ref(),
                );
            }

            self.canvas.restore();
        }
    }

    fn render_and_blend_layer(&mut self, item_rc: &ItemRc) -> RenderingResult {
        if let Some((layer_offset, layer_image)) =
            i_slint_core::item_rendering::render_layer(self, item_rc)
        {
            self.canvas.translate(skia_safe::Vector::from((layer_offset.x, layer_offset.y)));
            let _saved_canvas = self.pixel_align_origin_auto_restore();
            self.canvas.draw_image_with_sampling_options(
                layer_image,
                skia_safe::Point::default(),
                skia_safe::sampling_options::FilterMode::Linear,
                self.default_paint().as_ref(),
            );
        }
        RenderingResult::ContinueRenderingWithoutChildren
    }

    // Same as pixel_align_origin_auto_restore() but can be used across function calls where
    // `&self` is needed. Returns true if the caller must call `restore()` on `self.canvas`.
    fn save_canvas_and_pixel_align_origin(&self) -> bool {
        let local_to_device = self.canvas.local_to_device_as_3x3();
        if !keeps_pixel_grid(&local_to_device) || local_to_device.is_identity() {
            return false;
        }
        let Some(device_to_local) = local_to_device.invert() else {
            return false;
        };
        let mut target_point = local_to_device.map_point(skia_safe::Point::default());

        target_point.x = target_point.x.round();
        target_point.y = target_point.y.round();

        self.canvas.save();

        self.canvas.translate(device_to_local.map_point(target_point));

        true
    }

    fn pixel_align_origin_auto_restore(&self) -> Option<skia_safe::canvas::AutoRestoredCanvas<'_>> {
        let local_to_device = self.canvas.local_to_device_as_3x3();
        if !keeps_pixel_grid(&local_to_device) || local_to_device.is_identity() {
            return None;
        }
        let device_to_local = local_to_device.invert()?;
        let mut target_point = local_to_device.map_point(skia_safe::Point::default());

        target_point.x = target_point.x.round();
        target_point.y = target_point.y.round();

        let restore_point = skia_safe::AutoCanvasRestore::guard(self.canvas, true);

        self.canvas.translate(device_to_local.map_point(target_point));

        Some(restore_point)
    }
}

/// DarkRoom patch: whether `m` maps whole pixels onto whole pixels, so that
/// rounding the origin in device space aligns everything drawn after it.
///
/// Upstream asks `is_translate()`, which is right until the whole canvas is
/// turned a quarter turn for a pre-rotated swapchain (`wgpu_29_surface`):
/// then no matrix is a pure translation and pixel alignment silently stops
/// everywhere. A right-angle rotation or flip without scaling keeps the
/// grid just as well, so it qualifies too.
fn keeps_pixel_grid(m: &skia_safe::Matrix) -> bool {
    let unit = |v: f32| v == 0. || v == 1. || v == -1.;
    m.is_translate()
        || (!m.has_perspective()
            && m.rect_stays_rect()
            && unit(m.scale_x())
            && unit(m.scale_y())
            && unit(m.skew_x())
            && unit(m.skew_y()))
}

impl ItemRenderer for SkiaItemRenderer<'_> {
    fn draw_rectangle(
        &mut self,
        rect: Pin<&dyn i_slint_core::item_rendering::RenderRectangle>,
        _self_rc: &i_slint_core::items::ItemRc,
        size: LogicalSize,
        _cache: &CachedRenderingData,
    ) {
        let geometry = PhysicalRect::from(size * self.scale_factor);
        if geometry.is_empty() {
            return;
        }

        let paint = match self.brush_to_paint(
            rect.background(),
            geometry.width_length(),
            geometry.height_length(),
        ) {
            Some(paint) => paint,
            None => return,
        };
        self.canvas.draw_rect(to_skia_rect(&geometry), &paint);
    }

    fn draw_border_rectangle(
        &mut self,
        rect: Pin<&dyn i_slint_core::item_rendering::RenderBorderRectangle>,
        _self_rc: &i_slint_core::items::ItemRc,
        size: LogicalSize,
        _: &CachedRenderingData,
    ) {
        let mut geometry = PhysicalRect::from(size * self.scale_factor);
        if geometry.is_empty() {
            return;
        }

        // Save the original element bounds for gradient positioning. The CSS model positions
        // gradients relative to the border box (full element), but adjust_rect_and_border_for_inner_drawing
        // shrinks geometry before we create the paint, which would shift the gradient center inward.
        let original_width = geometry.width_length();
        let original_height = geometry.height_length();

        let border_color = rect.border_color();
        let opaque_border = border_color.is_opaque();
        let mut border_width = if border_color.is_transparent() {
            PhysicalLength::new(0.)
        } else {
            rect.border_width() * self.scale_factor
        };

        // Radius of rounded rect if we were to just fill the rectangle, without a border.
        let mut fill_radius = rect.border_radius() * self.scale_factor;
        // Skia's border radius on stroke is in the middle of the border. But we want it to be the radius of the rectangle itself.
        // This is incorrect if fill_radius < border_width/2, but this can't be fixed. Better to have a radius a bit too big than no radius at all
        fill_radius = fill_radius.outer(border_width / 2. + PhysicalLength::new(0.01));
        let stroke_border_radius = fill_radius.inner(border_width / 2.);

        let (background_rect, border_rect) = if opaque_border {
            // In CSS the border is entirely towards the inside of the boundary
            // geometry, while in femtovg the line with for a stroke is 50% in-
            // and 50% outwards. We choose the CSS model, so the inner rectangle
            // is adjusted accordingly.
            adjust_rect_and_border_for_inner_drawing(&mut geometry, &mut border_width);

            let rounded_rect = to_skia_rrect(&geometry, &stroke_border_radius);

            (rounded_rect, rounded_rect)
        } else {
            let background_rect = to_skia_rrect(&geometry, &fill_radius);

            // In CSS the border is entirely towards the inside of the boundary
            // geometry, while in femtovg the line with for a stroke is 50% in-
            // and 50% outwards. We choose the CSS model, so the inner rectangle
            // is adjusted accordingly.
            adjust_rect_and_border_for_inner_drawing(&mut geometry, &mut border_width);

            let border_rect = to_skia_rrect(&geometry, &stroke_border_radius);

            (background_rect, border_rect)
        };

        if let Some(mut fill_paint) =
            self.brush_to_paint(rect.background(), original_width, original_height)
        {
            fill_paint.set_style(skia_safe::PaintStyle::Fill);
            if !background_rect.is_rect() {
                fill_paint.set_anti_alias(true);
            }
            self.canvas.draw_rrect(background_rect, &fill_paint);
        }

        if border_width.get() > 0.0
            && let Some(mut border_paint) =
                self.brush_to_paint(border_color, original_width, original_height)
        {
            border_paint.set_style(skia_safe::PaintStyle::Stroke);
            border_paint.set_stroke_width(border_width.get());
            if !border_rect.is_rect() {
                border_paint.set_anti_alias(true);
            }
            self.canvas.draw_rrect(border_rect, &border_paint);
        }
    }

    fn draw_window_background(
        &mut self,
        _rect: Pin<&dyn i_slint_core::item_rendering::RenderRectangle>,
        _self_rc: &ItemRc,
        _size: LogicalSize,
        _cache: &CachedRenderingData,
    ) {
        // The background is drawn directly by FemtoVG renderer (via clear_color, if necessary).
    }

    fn draw_image(
        &mut self,
        image: Pin<&dyn RenderImage>,
        self_rc: &ItemRc,
        size: LogicalSize,
        _cache: &CachedRenderingData,
    ) {
        let geometry = PhysicalRect::from(size * self.scale_factor);
        if geometry.is_empty() {
            return;
        }
        self.draw_image_impl(self_rc, image, geometry);
    }

    fn draw_text(
        &mut self,
        text: Pin<&dyn RenderText>,
        self_rc: &i_slint_core::items::ItemRc,
        size: LogicalSize,
        _cache: &CachedRenderingData,
    ) {
        let restore = self.save_canvas_and_pixel_align_origin();
        sharedparley::draw_text(self, text, Some(self_rc), size, Some(self.text_layout_cache));
        if restore {
            self.canvas.restore();
        }
    }

    fn draw_text_input(
        &mut self,
        text_input: Pin<&i_slint_core::items::TextInput>,
        self_rc: &i_slint_core::items::ItemRc,
        size: LogicalSize,
    ) {
        let restore = self.save_canvas_and_pixel_align_origin();
        sharedparley::draw_text_input(self, text_input, self_rc, size, None);
        if restore {
            self.canvas.restore();
        }
    }

    fn draw_path(
        &mut self,
        path: Pin<&i_slint_core::items::Path>,
        item_rc: &i_slint_core::items::ItemRc,
        size: LogicalSize,
    ) {
        let geometry = PhysicalRect::from(size * self.scale_factor);

        let (physical_offset, skpath): (crate::euclid::Vector2D<f32, PhysicalPx>, _) =
            match self.path_cache.get_or_update_cache_entry(item_rc, || {
                let (logical_offset, path_events): (crate::euclid::Vector2D<f32, LogicalPx>, _) =
                    path.fitted_path_events(item_rc)?;

                let mut builder = skia_safe::PathBuilder::new();

                for x in path_events.iter() {
                    match x {
                        lyon_path::Event::Begin { at } => {
                            builder.move_to(to_skia_point(
                                LogicalPoint::from_untyped(at) * self.scale_factor,
                            ));
                        }
                        lyon_path::Event::Line { from: _, to } => {
                            builder.line_to(to_skia_point(
                                LogicalPoint::from_untyped(to) * self.scale_factor,
                            ));
                        }
                        lyon_path::Event::Quadratic { from: _, ctrl, to } => {
                            builder.quad_to(
                                to_skia_point(LogicalPoint::from_untyped(ctrl) * self.scale_factor),
                                to_skia_point(LogicalPoint::from_untyped(to) * self.scale_factor),
                            );
                        }

                        lyon_path::Event::Cubic { from: _, ctrl1, ctrl2, to } => {
                            builder.cubic_to(
                                to_skia_point(
                                    LogicalPoint::from_untyped(ctrl1) * self.scale_factor,
                                ),
                                to_skia_point(
                                    LogicalPoint::from_untyped(ctrl2) * self.scale_factor,
                                ),
                                to_skia_point(LogicalPoint::from_untyped(to) * self.scale_factor),
                            );
                        }
                        lyon_path::Event::End { last: _, first: _, close } => {
                            if close {
                                builder.close();
                            }
                        }
                    }
                }

                (logical_offset * self.scale_factor, builder.detach()).into()
            }) {
                Some(offset_and_path) => offset_and_path,
                None => return,
            };

        self.canvas.translate((physical_offset.x, physical_offset.y));

        let anti_alias = path.anti_alias();

        // For Path elements with conic gradients, we need to handle the viewbox transformation
        let viewbox_width = path.viewbox_width();
        let viewbox_height = path.viewbox_height();

        let paint = if viewbox_width > 0.0 && viewbox_height > 0.0 {
            // If there's a viewbox, we need to create the gradient in viewbox space
            // and then transform it to the actual size
            let scale_x = geometry.width() / viewbox_width;
            let scale_y = geometry.height() / viewbox_height;

            let paint = self.default_paint().unwrap_or_default();
            if let Some((mut paint, shader)) = Self::brush_to_shader(
                paint,
                path.fill(),
                PhysicalLength::new(viewbox_width),
                PhysicalLength::new(viewbox_height),
                1.0,
            ) {
                // Apply the viewbox transformation to the shader
                let transform = skia_safe::Matrix::scale((scale_x, scale_y));
                paint.set_shader(shader.with_local_matrix(&transform));
                Some(paint)
            } else {
                None
            }
        } else {
            self.brush_to_paint(path.fill(), geometry.width_length(), geometry.height_length())
        };

        if let Some(mut fill_paint) = paint {
            fill_paint.set_anti_alias(anti_alias);
            self.canvas.draw_path(&skpath, &fill_paint);
        }
        if let Some(mut border_paint) =
            self.brush_to_paint(path.stroke(), geometry.width_length(), geometry.height_length())
        {
            border_paint.set_anti_alias(anti_alias);
            border_paint.set_stroke_width((path.stroke_width() * self.scale_factor).get());
            border_paint.set_stroke_cap(match path.stroke_line_cap() {
                i_slint_core::items::LineCap::Round => skia_safe::PaintCap::Round,
                i_slint_core::items::LineCap::Square => skia_safe::PaintCap::Square,
                i_slint_core::items::LineCap::Butt | _ => skia_safe::PaintCap::Butt,
            });
            border_paint.set_stroke_join(match path.stroke_line_join() {
                i_slint_core::items::LineJoin::Round => skia_safe::PaintJoin::Round,
                i_slint_core::items::LineJoin::Bevel => skia_safe::PaintJoin::Bevel,
                i_slint_core::items::LineJoin::Miter | _ => skia_safe::PaintJoin::Miter,
            });
            border_paint.set_stroke_miter(path.stroke_miter_limit());
            border_paint.set_stroke(true);
            self.canvas.draw_path(&skpath, &border_paint);
        }
    }

    fn draw_box_shadow(
        &mut self,
        box_shadow: Pin<&i_slint_core::items::BoxShadow>,
        self_rc: &i_slint_core::items::ItemRc,
        _size: LogicalSize,
    ) {
        let offset = LogicalPoint::from_lengths(box_shadow.offset_x(), box_shadow.offset_y())
            * self.scale_factor;
        let inset = box_shadow.inset();
        let spread = box_shadow.spread() * self.scale_factor;

        // Drop shadow with no offset / blur / spread is invisible.
        if !inset
            && offset.x == 0.
            && offset.y == 0.
            && box_shadow.blur() == LogicalLength::zero()
            && spread == PhysicalLength::zero()
        {
            return;
        }

        let cached_shadow_image = self.box_shadow_cache.get_box_shadow(
            self_rc,
            self.image_cache,
            box_shadow,
            self.scale_factor,
            |shadow_options| {
                if shadow_options.inset {
                    Self::render_inset_shadow_image(self.canvas, shadow_options)
                } else {
                    Self::render_drop_shadow_image(self.canvas, shadow_options)
                }
            },
        );

        let cached_shadow_image = match cached_shadow_image {
            Some(img) => img,
            None => return,
        };

        if inset {
            // Inset image is sized exactly to the geometry; blit at origin.
            self.canvas.draw_image(
                cached_shadow_image,
                skia_safe::Point::new(0., 0.),
                self.default_paint().as_ref(),
            );
        } else {
            let blur = box_shadow.blur() * self.scale_factor;
            let pad = blur.get() + spread.get().max(0.);
            self.canvas.draw_image(
                cached_shadow_image,
                to_skia_point(offset - PhysicalPoint::new(pad, pad).to_vector()),
                self.default_paint().as_ref(),
            );
        }
    }

    fn combine_clip(
        &mut self,
        rect: LogicalRect,
        radius: LogicalBorderRadius,
        border_width: LogicalLength,
    ) -> bool {
        let mut rect = rect * self.scale_factor;
        let mut border_width = border_width * self.scale_factor;
        // In CSS the border is entirely towards the inside of the boundary
        // geometry, while in femtovg the line with for a stroke is 50% in-
        // and 50% outwards. We choose the CSS model, so the inner rectangle
        // is adjusted accordingly.
        adjust_rect_and_border_for_inner_drawing(&mut rect, &mut border_width);

        let radius = radius * self.scale_factor;
        let rounded_rect = to_skia_rrect(&rect, &radius);
        self.canvas.clip_rrect(rounded_rect, None, true);
        self.canvas.local_clip_bounds().is_some()
    }

    fn get_current_clip(&self) -> LogicalRect {
        from_skia_rect(&self.canvas.local_clip_bounds().unwrap_or_default()) / self.scale_factor
    }

    fn translate(&mut self, distance: LogicalVector) {
        self.current_state.transform = self.current_state.transform.pre_translate(distance.cast());
        let distance = distance * self.scale_factor;
        self.canvas.translate(skia_safe::Vector::from((distance.x, distance.y)));
    }

    fn current_transform(&self) -> i_slint_core::lengths::ItemTransform {
        self.current_state.transform
    }

    fn rotate(&mut self, angle_in_degrees: f32) {
        self.current_state.transform =
            self.current_state.transform.pre_rotate(euclid::Angle::degrees(angle_in_degrees));
        self.canvas.rotate(angle_in_degrees, None);
    }

    fn scale(&mut self, x_factor: f32, y_factor: f32) {
        self.current_state.transform = self.current_state.transform.pre_scale(x_factor, y_factor);
        self.canvas.scale((x_factor, y_factor));
    }

    fn apply_opacity(&mut self, opacity: f32) {
        self.current_state.alpha *= opacity;
    }

    fn save_state(&mut self) {
        self.canvas.save();
        self.state_stack.push(self.current_state);
    }

    fn restore_state(&mut self) {
        self.current_state = self.state_stack.pop().unwrap();
        self.canvas.restore();
    }

    fn scale_factor(&self) -> f32 {
        self.scale_factor.get()
    }

    fn draw_cached_pixmap(
        &mut self,
        item_rc: &i_slint_core::items::ItemRc,
        update_fn: &dyn Fn(&mut dyn FnMut(u32, u32, &[u8])),
    ) {
        let skia_image = self.image_cache.get_or_update_cache_entry(item_rc, || {
            let mut cached_image = None;
            update_fn(&mut |width: u32, height: u32, data: &[u8]| {
                let image_info = skia_safe::ImageInfo::new(
                    skia_safe::ISize::new(width as i32, height as i32),
                    skia_safe::ColorType::RGBA8888,
                    skia_safe::AlphaType::Premul,
                    None,
                );
                cached_image = skia_safe::images::raster_from_data(
                    &image_info,
                    skia_safe::Data::new_copy(data),
                    width as usize * 4,
                );
            });
            cached_image
        });
        let skia_image = match skia_image {
            Some(img) => img,
            None => return,
        };
        let _saved_canvas = self.pixel_align_origin_auto_restore();
        self.canvas.draw_image(skia_image, skia_safe::Point::default(), None);
    }

    fn draw_string(&mut self, string: &str, color: i_slint_core::Color) {
        sharedparley::draw_text(
            self,
            std::pin::pin!((SharedString::from(string), Brush::from(color))),
            None,
            logical_size_from_api(self.window.size().to_logical(self.scale_factor())),
            None,
        );
    }

    fn draw_image_direct(&mut self, image: i_slint_core::graphics::Image) {
        let skia_image = super::cached_image::as_skia_image(
            image.clone(),
            &|| LogicalSize::from_untyped(image.size().cast()),
            ImageFit::Fill,
            self.scale_factor,
            self.canvas,
            self.surface,
        );

        let skia_image = match skia_image {
            Some(img) => img,
            None => return,
        };

        self.canvas.draw_image(
            skia_image,
            skia_safe::Point::default(),
            self.default_paint().as_ref(),
        );
    }

    fn window(&self) -> &i_slint_core::window::WindowInner {
        i_slint_core::window::WindowInner::from_pub(self.window)
    }

    fn as_any(&mut self) -> Option<&mut dyn core::any::Any> {
        None
    }

    fn visit_opacity(
        &mut self,
        opacity_item: Pin<&Opacity>,
        item_rc: &ItemRc,
        _size: LogicalSize,
    ) -> RenderingResult {
        let opacity = opacity_item.opacity();
        if Opacity::need_layer(item_rc, opacity) {
            self.canvas.save_layer_alpha(None, (opacity * 255.) as u32);
            self.state_stack.push(self.current_state);
            self.current_state.alpha = 1.0;

            let window_adapter = WindowInner::from_pub(self.window).window_adapter();

            i_slint_core::item_rendering::render_item_children(
                self,
                item_rc.item_tree(),
                item_rc.index() as isize,
                &window_adapter,
            );

            self.current_state = self.state_stack.pop().unwrap();
            self.canvas.restore();
            RenderingResult::ContinueRenderingWithoutChildren
        } else {
            self.apply_opacity(opacity);
            RenderingResult::ContinueRenderingChildren
        }
    }

    fn visit_layer(
        &mut self,
        layer_item: Pin<&Layer>,
        self_rc: &ItemRc,
        _size: LogicalSize,
    ) -> RenderingResult {
        if layer_item.cache_rendering_hint() {
            self.render_and_blend_layer(self_rc)
        } else {
            self.image_cache.release(self_rc);
            RenderingResult::ContinueRenderingChildren
        }
    }
}

impl<'a> LayerRenderer<'a> for SkiaItemRenderer<'a> {
    type LayerTarget = skia_safe::Surface;
    type Image = skia_safe::Image;

    fn layer_cache(&self) -> &'a ItemCache<Option<(PhysicalPoint, Self::Image)>> {
        self.layer_cache
    }

    fn create_layer_target(
        &mut self,
        _item_rc: &ItemRc,
        physical_size: euclid::Size2D<f32, PhysicalPx>,
    ) -> Option<Self::LayerTarget> {
        let image_info = skia_safe::ImageInfo::new(
            to_skia_size(&physical_size).to_ceil(),
            skia_safe::ColorType::RGBA8888,
            skia_safe::AlphaType::Premul,
            None,
        );
        self.canvas.new_surface(&image_info, None)
    }

    fn render_into_layer(
        &mut self,
        mut surface: Self::LayerTarget,
        item_rc: &ItemRc,
        bounding_rect: LogicalRect,
    ) -> Self::Image {
        let canvas = surface.canvas();
        canvas.clear(skia_safe::Color::TRANSPARENT);

        let mut sub_renderer = SkiaItemRenderer::new(
            canvas,
            self.window,
            self.surface,
            self.image_cache,
            self.layer_cache,
            self.path_cache,
            self.text_layout_cache,
            self.box_shadow_cache,
        );
        sub_renderer.translate(-bounding_rect.origin.to_vector());

        i_slint_core::item_rendering::render_item_children(
            &mut sub_renderer,
            item_rc.item_tree(),
            item_rc.index() as isize,
            &WindowInner::from_pub(self.window).window_adapter(),
        );

        surface.image_snapshot()
    }
}

impl GlyphRenderer for SkiaItemRenderer<'_> {
    type PlatformBrush = skia_safe::Paint;

    fn platform_text_fill_brush(
        &mut self,
        brush: i_slint_core::Brush,
        size: LogicalSize,
    ) -> Option<Self::PlatformBrush> {
        self.brush_to_paint(
            brush,
            size.width_length() * self.scale_factor,
            size.height_length() * self.scale_factor,
        )
    }

    fn platform_brush_for_color(
        &mut self,
        color: &i_slint_core::Color,
    ) -> Option<Self::PlatformBrush> {
        if color.alpha() == 0 {
            None
        } else {
            let mut paint = self.default_paint().unwrap_or_default();
            paint.set_shader(skia_safe::shaders::color(to_skia_color(color)));
            Some(paint)
        }
    }

    fn platform_text_stroke_brush(
        &mut self,
        brush: i_slint_core::Brush,
        physical_stroke_width: f32,
        size: LogicalSize,
    ) -> Option<Self::PlatformBrush> {
        match self.brush_to_paint(
            brush.clone(),
            size.width_length() * self.scale_factor,
            size.height_length() * self.scale_factor,
        ) {
            Some(mut stroke_paint) => {
                stroke_paint.set_style(skia_safe::PaintStyle::Stroke);
                stroke_paint.set_stroke_width(physical_stroke_width);
                // Set stroke cap/join/miter to match FemtoVG
                stroke_paint.set_stroke_cap(skia_safe::PaintCap::Butt);
                stroke_paint.set_stroke_join(skia_safe::PaintJoin::Miter);
                stroke_paint.set_stroke_miter(10.0);
                Some(stroke_paint)
            }
            None => None,
        }
    }

    fn draw_glyph_run(
        &mut self,
        font: &sharedparley::parley::FontData,
        font_size: PhysicalLength,
        _normalized_coords: &[i16],
        synthesis: &fontique::Synthesis,
        brush: Self::PlatformBrush,
        y_offset: sharedparley::PhysicalLength,
        glyphs_it: &mut dyn Iterator<Item = sharedparley::parley::layout::Glyph>,
    ) {
        let Some(type_face) = crate::font_cache::FONT_CACHE
            .with_borrow_mut(|font_cache| font_cache.font_with_variations(font, synthesis))
        else {
            return;
        };
        let mut font = skia_safe::Font::from_typeface(type_face, font_size.get());
        font.set_subpixel(true);

        let (glyph_ids, glyph_positions): (Vec<_>, Vec<_>) = glyphs_it
            .into_iter()
            .map(|g| (g.id as skia_safe::GlyphId, skia_safe::Point::new(g.x, g.y + y_offset.get())))
            .unzip();

        self.canvas.draw_glyphs_at(
            &glyph_ids,
            skia_safe::canvas::GlyphPositions::Points(&glyph_positions),
            skia_safe::Point::default(),
            &font,
            &brush,
        );
    }

    fn fill_rectangle(
        &mut self,
        physical_rect: sharedparley::PhysicalRect,
        paint: Self::PlatformBrush,
    ) {
        self.canvas.draw_rect(
            skia_safe::Rect::from_xywh(
                physical_rect.min_x(),
                physical_rect.min_y(),
                physical_rect.width(),
                physical_rect.height(),
            ),
            &paint,
        );
    }
}

pub fn from_skia_rect(rect: &skia_safe::Rect) -> PhysicalRect {
    let top_left = euclid::Point2D::new(rect.left, rect.top);
    let bottom_right = euclid::Point2D::new(rect.right, rect.bottom);
    euclid::Box2D::new(top_left, bottom_right).to_rect()
}

pub fn to_skia_rect(rect: &PhysicalRect) -> skia_safe::Rect {
    skia_safe::Rect::from_xywh(rect.origin.x, rect.origin.y, rect.size.width, rect.size.height)
}

pub fn to_skia_rrect(rect: &PhysicalRect, radius: &PhysicalBorderRadius) -> skia_safe::RRect {
    if let Some(radius) = radius.as_uniform() {
        skia_safe::RRect::new_rect_xy(to_skia_rect(rect), radius, radius)
    } else {
        skia_safe::RRect::new_rect_radii(
            to_skia_rect(rect),
            &[
                skia_safe::Point::new(radius.top_left, radius.top_left),
                skia_safe::Point::new(radius.top_right, radius.top_right),
                skia_safe::Point::new(radius.bottom_right, radius.bottom_right),
                skia_safe::Point::new(radius.bottom_left, radius.bottom_left),
            ],
        )
    }
}

impl ItemRendererFeatures for SkiaItemRenderer<'_> {
    const SUPPORTS_TRANSFORMATIONS: bool = true;
}

pub fn to_skia_point(point: PhysicalPoint) -> skia_safe::Point {
    skia_safe::Point::new(point.x, point.y)
}

pub fn to_skia_size(size: &PhysicalSize) -> skia_safe::Size {
    skia_safe::Size::new(size.width, size.height)
}

pub fn to_skia_color(col: &Color) -> skia_safe::Color {
    skia_safe::Color::from_argb(col.alpha(), col.red(), col.green(), col.blue())
}

fn adjust_rect_and_border_for_inner_drawing(
    rect: &mut PhysicalRect,
    border_width: &mut PhysicalLength,
) {
    // If the border width exceeds the width, just fill the rectangle.
    *border_width = border_width.min(rect.width_length() / 2.);
    // adjust the size so that the border is drawn within the geometry

    rect.origin += PhysicalSize::from_lengths(*border_width / 2., *border_width / 2.);
    rect.size -= PhysicalSize::from_lengths(*border_width, *border_width);
}