Modularize iced_wgpu

wgpu/src/renderer/button.rs

@@ -0,0 +1,18 @@
+use crate::{Primitive, Renderer};
+use iced_native::{button, Button, Layout, Node, Point, Style};
+
+impl button::Renderer for Renderer {
+    fn node<Message>(&self, _button: &Button<Message>) -> Node {
+        Node::new(Style::default())
+    }
+
+    fn draw<Message>(
+        &mut self,
+        _button: &Button<Message>,
+        _layout: Layout<'_>,
+        _cursor_position: Point,
+    ) -> Self::Primitive {
+        // TODO
+        Primitive::None
+    }
+}

wgpu/src/renderer/checkbox.rs

@@ -0,0 +1,18 @@
+use crate::{Primitive, Renderer};
+use iced_native::{checkbox, Checkbox, Layout, Node, Point, Style};
+
+impl checkbox::Renderer for Renderer {
+    fn node<Message>(&mut self, _checkbox: &Checkbox<Message>) -> Node {
+        Node::new(Style::default())
+    }
+
+    fn draw<Message>(
+        &mut self,
+        _checkbox: &Checkbox<Message>,
+        _layout: Layout<'_>,
+        _cursor_position: Point,
+    ) -> Self::Primitive {
+        // TODO
+        Primitive::None
+    }
+}

wgpu/src/renderer/column.rs

@@ -0,0 +1,22 @@
+use crate::{Primitive, Renderer};
+use iced_native::{column, Column, Layout, Point};
+
+impl column::Renderer for Renderer {
+    fn draw<Message>(
+        &mut self,
+        column: &Column<'_, Message, Self>,
+        layout: Layout<'_>,
+        cursor_position: Point,
+    ) -> Self::Primitive {
+        Primitive::Group {
+            primitives: column
+                .children
+                .iter()
+                .zip(layout.children())
+                .map(|(child, layout)| {
+                    child.draw(self, layout, cursor_position)
+                })
+                .collect(),
+        }
+    }
+}

wgpu/src/renderer/image.rs

@@ -0,0 +1,16 @@
+use crate::{Primitive, Renderer};
+use iced_native::{image, Image, Layout, Node, Style};
+
+impl image::Renderer<&str> for Renderer {
+    fn node(&mut self, _image: &Image<&str>) -> Node {
+        Node::new(Style::default())
+    }
+
+    fn draw(
+        &mut self,
+        _image: &Image<&str>,
+        _layout: Layout<'_>,
+    ) -> Self::Primitive {
+        Primitive::None
+    }
+}

wgpu/src/renderer/radio.rs

@@ -0,0 +1,17 @@
+use crate::{Primitive, Renderer};
+use iced_native::{radio, Layout, Node, Point, Radio, Style};
+
+impl radio::Renderer for Renderer {
+    fn node<Message>(&mut self, _checkbox: &Radio<Message>) -> Node {
+        Node::new(Style::default())
+    }
+
+    fn draw<Message>(
+        &mut self,
+        _radio: &Radio<Message>,
+        _layout: Layout<'_>,
+        _cursor_position: Point,
+    ) -> Self::Primitive {
+        Primitive::None
+    }
+}

wgpu/src/renderer/row.rs

@@ -0,0 +1,22 @@
+use crate::{Primitive, Renderer};
+use iced_native::{row, Layout, Point, Row};
+
+impl row::Renderer for Renderer {
+    fn draw<Message>(
+        &mut self,
+        row: &Row<'_, Message, Self>,
+        layout: Layout<'_>,
+        cursor_position: Point,
+    ) -> Self::Primitive {
+        Primitive::Group {
+            primitives: row
+                .children
+                .iter()
+                .zip(layout.children())
+                .map(|(child, layout)| {
+                    child.draw(self, layout, cursor_position)
+                })
+                .collect(),
+        }
+    }
+}

wgpu/src/renderer/slider.rs

@@ -0,0 +1,17 @@
+use crate::{Primitive, Renderer};
+use iced_native::{slider, Layout, Node, Point, Slider, Style};
+
+impl slider::Renderer for Renderer {
+    fn node<Message>(&self, _slider: &Slider<Message>) -> Node {
+        Node::new(Style::default())
+    }
+
+    fn draw<Message>(
+        &mut self,
+        _slider: &Slider<Message>,
+        _layout: Layout<'_>,
+        _cursor_position: Point,
+    ) -> Self::Primitive {
+        Primitive::None
+    }
+}

wgpu/src/renderer/text.rs

@@ -0,0 +1,77 @@
+use crate::{Primitive, Renderer};
+use iced_native::{text, Layout, Node, Style, Text};
+
+use wgpu_glyph::{GlyphCruncher, Section};
+
+use std::cell::RefCell;
+use std::f32;
+
+impl text::Renderer for Renderer {
+    fn node(&self, text: &Text) -> Node {
+        let glyph_brush = self.glyph_brush.clone();
+        let content = text.content.clone();
+
+        // TODO: Investigate why stretch tries to measure this MANY times
+        // with every ancestor's bounds.
+        // Bug? Using the library wrong? I should probably open an issue on
+        // the stretch repository.
+        // I noticed that the first measure is the one that matters in
+        // practice. Here, we use a RefCell to store the cached measurement.
+        let measure = RefCell::new(None);
+        let size = text.size.map(f32::from).unwrap_or(20.0);
+
+        let style = Style::default().width(text.width);
+
+        iced_native::Node::with_measure(style, move |bounds| {
+            let mut measure = measure.borrow_mut();
+
+            if measure.is_none() {
+                let bounds = (
+                    match bounds.width {
+                        iced_native::Number::Undefined => f32::INFINITY,
+                        iced_native::Number::Defined(w) => w,
+                    },
+                    match bounds.height {
+                        iced_native::Number::Undefined => f32::INFINITY,
+                        iced_native::Number::Defined(h) => h,
+                    },
+                );
+
+                let text = Section {
+                    text: &content,
+                    scale: wgpu_glyph::Scale { x: size, y: size },
+                    bounds,
+                    ..Default::default()
+                };
+
+                let (width, height) = if let Some(bounds) =
+                    glyph_brush.borrow_mut().glyph_bounds(&text)
+                {
+                    (bounds.width(), bounds.height())
+                } else {
+                    (0.0, 0.0)
+                };
+
+                let size = iced_native::Size { width, height };
+
+                // If the text has no width boundary we avoid caching as the
+                // layout engine may just be measuring text in a row.
+                if bounds.0 == f32::INFINITY {
+                    return size;
+                } else {
+                    *measure = Some(size);
+                }
+            }
+
+            measure.unwrap()
+        })
+    }
+
+    fn draw(&mut self, text: &Text, layout: Layout<'_>) -> Self::Primitive {
+        Primitive::Text {
+            content: text.content.clone(),
+            size: f32::from(text.size.unwrap_or(20)),
+            bounds: layout.bounds(),
+        }
+    }
+}