Implement `Canvas` support for `iced_tiny_skia`

4 files changed, 176 insertions, 0 deletions

diff --git a/wgpu/src/layer/image.rs b/wgpu/src/layer/image.rs
new file mode 100644
index 00000000..3eff2397
--- /dev/null
+++ b/wgpu/src/layer/image.rs
@@ -0,0 +1,27 @@
+use crate::{Color, Rectangle};
+
+use iced_native::{image, svg};
+
+/// A raster or vector image.
+#[derive(Debug, Clone)]
+pub enum Image {
+    /// A raster image.
+    Raster {
+        /// The handle of a raster image.
+        handle: image::Handle,
+
+        /// The bounds of the image.
+        bounds: Rectangle,
+    },
+    /// A vector image.
+    Vector {
+        /// The handle of a vector image.
+        handle: svg::Handle,
+
+        /// The [`Color`] filter
+        color: Option<Color>,
+
+        /// The bounds of the image.
+        bounds: Rectangle,
+    },
+}
diff --git a/wgpu/src/layer/mesh.rs b/wgpu/src/layer/mesh.rs
new file mode 100644
index 00000000..5c1e41ad
--- /dev/null
+++ b/wgpu/src/layer/mesh.rs
@@ -0,0 +1,93 @@
+//! A collection of triangle primitives.
+use crate::primitive;
+use crate::{Gradient, Point, Rectangle};
+
+/// A mesh of triangles.
+#[derive(Debug, Clone, Copy)]
+pub enum Mesh<'a> {
+    /// A mesh of triangles with a solid color.
+    Solid {
+        /// The origin of the vertices of the [`Mesh`].
+        origin: Point,
+
+        /// The vertex and index buffers of the [`Mesh`].
+        buffers: &'a primitive::Mesh2D<primitive::ColoredVertex2D>,
+
+        /// The clipping bounds of the [`Mesh`].
+        clip_bounds: Rectangle<f32>,
+    },
+    /// A mesh of triangles with a gradient color.
+    Gradient {
+        /// The origin of the vertices of the [`Mesh`].
+        origin: Point,
+
+        /// The vertex and index buffers of the [`Mesh`].
+        buffers: &'a primitive::Mesh2D<primitive::Vertex2D>,
+
+        /// The clipping bounds of the [`Mesh`].
+        clip_bounds: Rectangle<f32>,
+
+        /// The gradient to apply to the [`Mesh`].
+        gradient: &'a Gradient,
+    },
+}
+
+impl Mesh<'_> {
+    /// Returns the origin of the [`Mesh`].
+    pub fn origin(&self) -> Point {
+        match self {
+            Self::Solid { origin, .. } | Self::Gradient { origin, .. } => {
+                *origin
+            }
+        }
+    }
+
+    /// Returns the indices of the [`Mesh`].
+    pub fn indices(&self) -> &[u32] {
+        match self {
+            Self::Solid { buffers, .. } => &buffers.indices,
+            Self::Gradient { buffers, .. } => &buffers.indices,
+        }
+    }
+
+    /// Returns the clip bounds of the [`Mesh`].
+    pub fn clip_bounds(&self) -> Rectangle<f32> {
+        match self {
+            Self::Solid { clip_bounds, .. }
+            | Self::Gradient { clip_bounds, .. } => *clip_bounds,
+        }
+    }
+}
+
+/// The result of counting the attributes of a set of meshes.
+#[derive(Debug, Clone, Copy, Default)]
+pub struct AttributeCount {
+    /// The total amount of solid vertices.
+    pub solid_vertices: usize,
+
+    /// The total amount of gradient vertices.
+    pub gradient_vertices: usize,
+
+    /// The total amount of indices.
+    pub indices: usize,
+}
+
+/// Returns the number of total vertices & total indices of all [`Mesh`]es.
+pub fn attribute_count_of<'a>(meshes: &'a [Mesh<'a>]) -> AttributeCount {
+    meshes
+        .iter()
+        .fold(AttributeCount::default(), |mut count, mesh| {
+            match mesh {
+                Mesh::Solid { buffers, .. } => {
+                    count.solid_vertices += buffers.vertices.len();
+                    count.indices += buffers.indices.len();
+                }
+                Mesh::Gradient { buffers, .. } => {
+                    count.gradient_vertices += buffers.vertices.len();
+                    count.indices += buffers.indices.len();
+                }
+            }
+
+            count
+        })
+}
diff --git a/wgpu/src/layer/quad.rs b/wgpu/src/layer/quad.rs
new file mode 100644
index 00000000..0d8bde9d
--- /dev/null
+++ b/wgpu/src/layer/quad.rs
@@ -0,0 +1,30 @@
+/// A colored rectangle with a border.
+///
+/// This type can be directly uploaded to GPU memory.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Quad {
+    /// The position of the [`Quad`].
+    pub position: [f32; 2],
+
+    /// The size of the [`Quad`].
+    pub size: [f32; 2],
+
+    /// The color of the [`Quad`], in __linear RGB__.
+    pub color: [f32; 4],
+
+    /// The border color of the [`Quad`], in __linear RGB__.
+    pub border_color: [f32; 4],
+
+    /// The border radius of the [`Quad`].
+    pub border_radius: [f32; 4],
+
+    /// The border width of the [`Quad`].
+    pub border_width: f32,
+}
+
+#[allow(unsafe_code)]
+unsafe impl bytemuck::Zeroable for Quad {}
+
+#[allow(unsafe_code)]
+unsafe impl bytemuck::Pod for Quad {}
diff --git a/wgpu/src/layer/text.rs b/wgpu/src/layer/text.rs
new file mode 100644
index 00000000..38d62616
--- /dev/null
+++ b/wgpu/src/layer/text.rs
@@ -0,0 +1,26 @@
+use crate::{alignment, Color, Font, Rectangle};
+
+/// A paragraph of text.
+#[derive(Debug, Clone, Copy)]
+pub struct Text<'a> {
+    /// The content of the [`Text`].
+    pub content: &'a str,
+
+    /// The layout bounds of the [`Text`].
+    pub bounds: Rectangle,
+
+    /// The color of the [`Text`], in __linear RGB_.
+    pub color: Color,
+
+    /// The size of the [`Text`].
+    pub size: f32,
+
+    /// The font of the [`Text`].
+    pub font: Font,
+
+    /// The horizontal alignment of the [`Text`].
+    pub horizontal_alignment: alignment::Horizontal,
+
+    /// The vertical alignment of the [`Text`].
+    pub vertical_alignment: alignment::Vertical,
+}