Implement `Canvas` support for `iced_tiny_skia`

1 files changed, 0 insertions, 530 deletions

diff --git a/graphics/src/widget/canvas/frame.rs b/graphics/src/widget/canvas/frame.rs
deleted file mode 100644
index d68548ae..00000000
--- a/graphics/src/widget/canvas/frame.rs
+++ /dev/null
@@ -1,530 +0,0 @@
-use crate::gradient::Gradient;
-use crate::triangle;
-use crate::widget::canvas::{path, Fill, Geometry, Path, Stroke, Style, Text};
-use crate::Primitive;
-
-use iced_native::{Point, Rectangle, Size, Vector};
-
-use lyon::geom::euclid;
-use lyon::tessellation;
-use std::borrow::Cow;
-
-/// The frame of a [`Canvas`].
-///
-/// [`Canvas`]: crate::widget::Canvas
-#[allow(missing_debug_implementations)]
-pub struct Frame {
-    size: Size,
-    buffers: BufferStack,
-    primitives: Vec<Primitive>,
-    transforms: Transforms,
-    fill_tessellator: tessellation::FillTessellator,
-    stroke_tessellator: tessellation::StrokeTessellator,
-}
-
-enum Buffer {
-    Solid(tessellation::VertexBuffers<triangle::ColoredVertex2D, u32>),
-    Gradient(
-        tessellation::VertexBuffers<triangle::Vertex2D, u32>,
-        Gradient,
-    ),
-}
-
-struct BufferStack {
-    stack: Vec<Buffer>,
-}
-
-impl BufferStack {
-    fn new() -> Self {
-        Self { stack: Vec::new() }
-    }
-
-    fn get_mut(&mut self, style: &Style) -> &mut Buffer {
-        match style {
-            Style::Solid(_) => match self.stack.last() {
-                Some(Buffer::Solid(_)) => {}
-                _ => {
-                    self.stack.push(Buffer::Solid(
-                        tessellation::VertexBuffers::new(),
-                    ));
-                }
-            },
-            Style::Gradient(gradient) => match self.stack.last() {
-                Some(Buffer::Gradient(_, last)) if gradient == last => {}
-                _ => {
-                    self.stack.push(Buffer::Gradient(
-                        tessellation::VertexBuffers::new(),
-                        gradient.clone(),
-                    ));
-                }
-            },
-        }
-
-        self.stack.last_mut().unwrap()
-    }
-
-    fn get_fill<'a>(
-        &'a mut self,
-        style: &Style,
-    ) -> Box<dyn tessellation::FillGeometryBuilder + 'a> {
-        match (style, self.get_mut(style)) {
-            (Style::Solid(color), Buffer::Solid(buffer)) => {
-                Box::new(tessellation::BuffersBuilder::new(
-                    buffer,
-                    TriangleVertex2DBuilder(color.into_linear()),
-                ))
-            }
-            (Style::Gradient(_), Buffer::Gradient(buffer, _)) => Box::new(
-                tessellation::BuffersBuilder::new(buffer, Vertex2DBuilder),
-            ),
-            _ => unreachable!(),
-        }
-    }
-
-    fn get_stroke<'a>(
-        &'a mut self,
-        style: &Style,
-    ) -> Box<dyn tessellation::StrokeGeometryBuilder + 'a> {
-        match (style, self.get_mut(style)) {
-            (Style::Solid(color), Buffer::Solid(buffer)) => {
-                Box::new(tessellation::BuffersBuilder::new(
-                    buffer,
-                    TriangleVertex2DBuilder(color.into_linear()),
-                ))
-            }
-            (Style::Gradient(_), Buffer::Gradient(buffer, _)) => Box::new(
-                tessellation::BuffersBuilder::new(buffer, Vertex2DBuilder),
-            ),
-            _ => unreachable!(),
-        }
-    }
-}
-
-#[derive(Debug)]
-struct Transforms {
-    previous: Vec<Transform>,
-    current: Transform,
-}
-
-#[derive(Debug, Clone, Copy)]
-struct Transform {
-    raw: lyon::math::Transform,
-    is_identity: bool,
-}
-
-impl Transform {
-    /// Transforms the given [Point] by the transformation matrix.
-    fn transform_point(&self, point: &mut Point) {
-        let transformed = self
-            .raw
-            .transform_point(euclid::Point2D::new(point.x, point.y));
-        point.x = transformed.x;
-        point.y = transformed.y;
-    }
-
-    fn transform_style(&self, style: Style) -> Style {
-        match style {
-            Style::Solid(color) => Style::Solid(color),
-            Style::Gradient(gradient) => {
-                Style::Gradient(self.transform_gradient(gradient))
-            }
-        }
-    }
-
-    fn transform_gradient(&self, mut gradient: Gradient) -> Gradient {
-        let (start, end) = match &mut gradient {
-            Gradient::Linear(linear) => (&mut linear.start, &mut linear.end),
-        };
-        self.transform_point(start);
-        self.transform_point(end);
-        gradient
-    }
-}
-
-impl Frame {
-    /// Creates a new empty [`Frame`] with the given dimensions.
-    ///
-    /// The default coordinate system of a [`Frame`] has its origin at the
-    /// top-left corner of its bounds.
-    pub fn new(size: Size) -> Frame {
-        Frame {
-            size,
-            buffers: BufferStack::new(),
-            primitives: Vec::new(),
-            transforms: Transforms {
-                previous: Vec::new(),
-                current: Transform {
-                    raw: lyon::math::Transform::identity(),
-                    is_identity: true,
-                },
-            },
-            fill_tessellator: tessellation::FillTessellator::new(),
-            stroke_tessellator: tessellation::StrokeTessellator::new(),
-        }
-    }
-
-    /// Returns the width of the [`Frame`].
-    #[inline]
-    pub fn width(&self) -> f32 {
-        self.size.width
-    }
-
-    /// Returns the height of the [`Frame`].
-    #[inline]
-    pub fn height(&self) -> f32 {
-        self.size.height
-    }
-
-    /// Returns the dimensions of the [`Frame`].
-    #[inline]
-    pub fn size(&self) -> Size {
-        self.size
-    }
-
-    /// Returns the coordinate of the center of the [`Frame`].
-    #[inline]
-    pub fn center(&self) -> Point {
-        Point::new(self.size.width / 2.0, self.size.height / 2.0)
-    }
-
-    /// Draws the given [`Path`] on the [`Frame`] by filling it with the
-    /// provided style.
-    pub fn fill(&mut self, path: &Path, fill: impl Into<Fill>) {
-        let Fill { style, rule } = fill.into();
-
-        let mut buffer = self
-            .buffers
-            .get_fill(&self.transforms.current.transform_style(style));
-
-        let options =
-            tessellation::FillOptions::default().with_fill_rule(rule.into());
-
-        if self.transforms.current.is_identity {
-            self.fill_tessellator.tessellate_path(
-                path.raw(),
-                &options,
-                buffer.as_mut(),
-            )
-        } else {
-            let path = path.transformed(&self.transforms.current.raw);
-
-            self.fill_tessellator.tessellate_path(
-                path.raw(),
-                &options,
-                buffer.as_mut(),
-            )
-        }
-        .expect("Tessellate path.");
-    }
-
-    /// Draws an axis-aligned rectangle given its top-left corner coordinate and
-    /// its `Size` on the [`Frame`] by filling it with the provided style.
-    pub fn fill_rectangle(
-        &mut self,
-        top_left: Point,
-        size: Size,
-        fill: impl Into<Fill>,
-    ) {
-        let Fill { style, rule } = fill.into();
-
-        let mut buffer = self
-            .buffers
-            .get_fill(&self.transforms.current.transform_style(style));
-
-        let top_left =
-            self.transforms.current.raw.transform_point(
-                lyon::math::Point::new(top_left.x, top_left.y),
-            );
-
-        let size =
-            self.transforms.current.raw.transform_vector(
-                lyon::math::Vector::new(size.width, size.height),
-            );
-
-        let options =
-            tessellation::FillOptions::default().with_fill_rule(rule.into());
-
-        self.fill_tessellator
-            .tessellate_rectangle(
-                &lyon::math::Box2D::new(top_left, top_left + size),
-                &options,
-                buffer.as_mut(),
-            )
-            .expect("Fill rectangle");
-    }
-
-    /// Draws the stroke of the given [`Path`] on the [`Frame`] with the
-    /// provided style.
-    pub fn stroke<'a>(&mut self, path: &Path, stroke: impl Into<Stroke<'a>>) {
-        let stroke = stroke.into();
-
-        let mut buffer = self
-            .buffers
-            .get_stroke(&self.transforms.current.transform_style(stroke.style));
-
-        let mut options = tessellation::StrokeOptions::default();
-        options.line_width = stroke.width;
-        options.start_cap = stroke.line_cap.into();
-        options.end_cap = stroke.line_cap.into();
-        options.line_join = stroke.line_join.into();
-
-        let path = if stroke.line_dash.segments.is_empty() {
-            Cow::Borrowed(path)
-        } else {
-            Cow::Owned(path::dashed(path, stroke.line_dash))
-        };
-
-        if self.transforms.current.is_identity {
-            self.stroke_tessellator.tessellate_path(
-                path.raw(),
-                &options,
-                buffer.as_mut(),
-            )
-        } else {
-            let path = path.transformed(&self.transforms.current.raw);
-
-            self.stroke_tessellator.tessellate_path(
-                path.raw(),
-                &options,
-                buffer.as_mut(),
-            )
-        }
-        .expect("Stroke path");
-    }
-
-    /// Draws the characters of the given [`Text`] on the [`Frame`], filling
-    /// them with the given color.
-    ///
-    /// __Warning:__ Text currently does not work well with rotations and scale
-    /// transforms! The position will be correctly transformed, but the
-    /// resulting glyphs will not be rotated or scaled properly.
-    ///
-    /// Additionally, all text will be rendered on top of all the layers of
-    /// a [`Canvas`]. Therefore, it is currently only meant to be used for
-    /// overlays, which is the most common use case.
-    ///
-    /// Support for vectorial text is planned, and should address all these
-    /// limitations.
-    ///
-    /// [`Canvas`]: crate::widget::Canvas
-    pub fn fill_text(&mut self, text: impl Into<Text>) {
-        let text = text.into();
-
-        let position = if self.transforms.current.is_identity {
-            text.position
-        } else {
-            let transformed = self.transforms.current.raw.transform_point(
-                lyon::math::Point::new(text.position.x, text.position.y),
-            );
-
-            Point::new(transformed.x, transformed.y)
-        };
-
-        // TODO: Use vectorial text instead of primitive
-        self.primitives.push(Primitive::Text {
-            content: text.content,
-            bounds: Rectangle {
-                x: position.x,
-                y: position.y,
-                width: f32::INFINITY,
-                height: f32::INFINITY,
-            },
-            color: text.color,
-            size: text.size,
-            font: text.font,
-            horizontal_alignment: text.horizontal_alignment,
-            vertical_alignment: text.vertical_alignment,
-        });
-    }
-
-    /// Stores the current transform of the [`Frame`] and executes the given
-    /// drawing operations, restoring the transform afterwards.
-    ///
-    /// This method is useful to compose transforms and perform drawing
-    /// operations in different coordinate systems.
-    #[inline]
-    pub fn with_save(&mut self, f: impl FnOnce(&mut Frame)) {
-        self.transforms.previous.push(self.transforms.current);
-
-        f(self);
-
-        self.transforms.current = self.transforms.previous.pop().unwrap();
-    }
-
-    /// Executes the given drawing operations within a [`Rectangle`] region,
-    /// clipping any geometry that overflows its bounds. Any transformations
-    /// performed are local to the provided closure.
-    ///
-    /// This method is useful to perform drawing operations that need to be
-    /// clipped.
-    #[inline]
-    pub fn with_clip(&mut self, region: Rectangle, f: impl FnOnce(&mut Frame)) {
-        let mut frame = Frame::new(region.size());
-
-        f(&mut frame);
-
-        let primitives = frame.into_primitives();
-
-        let (text, meshes) = primitives
-            .into_iter()
-            .partition(|primitive| matches!(primitive, Primitive::Text { .. }));
-
-        let translation = Vector::new(region.x, region.y);
-
-        self.primitives.push(Primitive::Group {
-            primitives: vec![
-                Primitive::Translate {
-                    translation,
-                    content: Box::new(Primitive::Group { primitives: meshes }),
-                },
-                Primitive::Translate {
-                    translation,
-                    content: Box::new(Primitive::Clip {
-                        bounds: Rectangle::with_size(region.size()),
-                        content: Box::new(Primitive::Group {
-                            primitives: text,
-                        }),
-                    }),
-                },
-            ],
-        });
-    }
-
-    /// Applies a translation to the current transform of the [`Frame`].
-    #[inline]
-    pub fn translate(&mut self, translation: Vector) {
-        self.transforms.current.raw = self
-            .transforms
-            .current
-            .raw
-            .pre_translate(lyon::math::Vector::new(
-                translation.x,
-                translation.y,
-            ));
-        self.transforms.current.is_identity = false;
-    }
-
-    /// Applies a rotation in radians to the current transform of the [`Frame`].
-    #[inline]
-    pub fn rotate(&mut self, angle: f32) {
-        self.transforms.current.raw = self
-            .transforms
-            .current
-            .raw
-            .pre_rotate(lyon::math::Angle::radians(angle));
-        self.transforms.current.is_identity = false;
-    }
-
-    /// Applies a scaling to the current transform of the [`Frame`].
-    #[inline]
-    pub fn scale(&mut self, scale: f32) {
-        self.transforms.current.raw =
-            self.transforms.current.raw.pre_scale(scale, scale);
-        self.transforms.current.is_identity = false;
-    }
-
-    /// Produces the [`Geometry`] representing everything drawn on the [`Frame`].
-    pub fn into_geometry(self) -> Geometry {
-        Geometry::from_primitive(Primitive::Group {
-            primitives: self.into_primitives(),
-        })
-    }
-
-    fn into_primitives(mut self) -> Vec<Primitive> {
-        for buffer in self.buffers.stack {
-            match buffer {
-                Buffer::Solid(buffer) => {
-                    if !buffer.indices.is_empty() {
-                        self.primitives.push(Primitive::SolidMesh {
-                            buffers: triangle::Mesh2D {
-                                vertices: buffer.vertices,
-                                indices: buffer.indices,
-                            },
-                            size: self.size,
-                        })
-                    }
-                }
-                Buffer::Gradient(buffer, gradient) => {
-                    if !buffer.indices.is_empty() {
-                        self.primitives.push(Primitive::GradientMesh {
-                            buffers: triangle::Mesh2D {
-                                vertices: buffer.vertices,
-                                indices: buffer.indices,
-                            },
-                            size: self.size,
-                            gradient,
-                        })
-                    }
-                }
-            }
-        }
-
-        self.primitives
-    }
-}
-
-struct Vertex2DBuilder;
-
-impl tessellation::FillVertexConstructor<triangle::Vertex2D>
-    for Vertex2DBuilder
-{
-    fn new_vertex(
-        &mut self,
-        vertex: tessellation::FillVertex<'_>,
-    ) -> triangle::Vertex2D {
-        let position = vertex.position();
-
-        triangle::Vertex2D {
-            position: [position.x, position.y],
-        }
-    }
-}
-
-impl tessellation::StrokeVertexConstructor<triangle::Vertex2D>
-    for Vertex2DBuilder
-{
-    fn new_vertex(
-        &mut self,
-        vertex: tessellation::StrokeVertex<'_, '_>,
-    ) -> triangle::Vertex2D {
-        let position = vertex.position();
-
-        triangle::Vertex2D {
-            position: [position.x, position.y],
-        }
-    }
-}
-
-struct TriangleVertex2DBuilder([f32; 4]);
-
-impl tessellation::FillVertexConstructor<triangle::ColoredVertex2D>
-    for TriangleVertex2DBuilder
-{
-    fn new_vertex(
-        &mut self,
-        vertex: tessellation::FillVertex<'_>,
-    ) -> triangle::ColoredVertex2D {
-        let position = vertex.position();
-
-        triangle::ColoredVertex2D {
-            position: [position.x, position.y],
-            color: self.0,
-        }
-    }
-}
-
-impl tessellation::StrokeVertexConstructor<triangle::ColoredVertex2D>
-    for TriangleVertex2DBuilder
-{
-    fn new_vertex(
-        &mut self,
-        vertex: tessellation::StrokeVertex<'_, '_>,
-    ) -> triangle::ColoredVertex2D {
-        let position = vertex.position();
-
-        triangle::ColoredVertex2D {
-            position: [position.x, position.y],
-            color: self.0,
-        }
-    }
-}