HiDPI support

core/src/rectangle.rs

@@ -28,3 +28,16 @@ impl Rectangle<f32> {
             && point.y <= self.y + self.height
     }
 }
+
+impl std::ops::Mul<f32> for Rectangle<u32> {
+    type Output = Self;
+
+    fn mul(self, scale: f32) -> Self {
+        Self {
+            x: (self.x as f32 * scale).round() as u32,
+            y: (self.y as f32 * scale).round() as u32,
+            width: (self.width as f32 * scale).round() as u32,
+            height: (self.height as f32 * scale).round() as u32,
+        }
+    }
+}

native/src/renderer/windowed.rs

@@ -22,8 +22,15 @@ pub trait Target {
         window: &W,
         width: u16,
         height: u16,
+        dpi: f32,
         renderer: &Self::Renderer,
     ) -> Self;
 
-    fn resize(&mut self, width: u16, height: u16, renderer: &Self::Renderer);
+    fn resize(
+        &mut self,
+        width: u16,
+        height: u16,
+        dpi: f32,
+        renderer: &Self::Renderer,
+    );
 }

wgpu/src/quad.rs

@@ -6,7 +6,7 @@ use std::mem;
 pub struct Pipeline {
     pipeline: wgpu::RenderPipeline,
     constants: wgpu::BindGroup,
-    transform: wgpu::Buffer,
+    constants_buffer: wgpu::Buffer,
     vertices: wgpu::Buffer,
     indices: wgpu::Buffer,
     instances: wgpu::Buffer,
@@ -23,20 +23,20 @@ impl Pipeline {
                 }],
             });
 
-        let transform = device
+        let constants_buffer = device
             .create_buffer_mapped(
-                16,
+                1,
                 wgpu::BufferUsage::UNIFORM | wgpu::BufferUsage::COPY_DST,
             )
-            .fill_from_slice(Transformation::identity().as_ref());
+            .fill_from_slice(&[Uniforms::default()]);
 
         let constants = device.create_bind_group(&wgpu::BindGroupDescriptor {
             layout: &constant_layout,
             bindings: &[wgpu::Binding {
                 binding: 0,
                 resource: wgpu::BindingResource::Buffer {
-                    buffer: &transform,
-                    range: 0..64,
+                    buffer: &constants_buffer,
+                    range: 0..std::mem::size_of::<Uniforms>() as u64,
                 },
             }],
         });
@@ -124,7 +124,7 @@ impl Pipeline {
                             },
                             wgpu::VertexAttributeDescriptor {
                                 shader_location: 4,
-                                format: wgpu::VertexFormat::Uint,
+                                format: wgpu::VertexFormat::Float,
                                 offset: 4 * (2 + 2 + 4),
                             },
                         ],
@@ -151,7 +151,7 @@ impl Pipeline {
         Pipeline {
             pipeline,
             constants,
-            transform,
+            constants_buffer,
             vertices,
             indices,
             instances,
@@ -164,19 +164,22 @@ impl Pipeline {
         encoder: &mut wgpu::CommandEncoder,
         instances: &[Quad],
         transformation: Transformation,
+        scale: f32,
         bounds: Rectangle<u32>,
         target: &wgpu::TextureView,
     ) {
-        let transform_buffer = device
-            .create_buffer_mapped(16, wgpu::BufferUsage::COPY_SRC)
-            .fill_from_slice(transformation.as_ref());
+        let uniforms = Uniforms::new(transformation, scale);
+
+        let constants_buffer = device
+            .create_buffer_mapped(1, wgpu::BufferUsage::COPY_SRC)
+            .fill_from_slice(&[uniforms]);
 
         encoder.copy_buffer_to_buffer(
-            &transform_buffer,
+            &constants_buffer,
             0,
-            &self.transform,
+            &self.constants_buffer,
             0,
-            16 * 4,
+            std::mem::size_of::<Uniforms>() as u64,
         );
 
         let mut i = 0;
@@ -271,9 +274,34 @@ pub struct Quad {
     pub position: [f32; 2],
     pub scale: [f32; 2],
     pub color: [f32; 4],
-    pub border_radius: u32,
+    pub border_radius: f32,
 }
 
 impl Quad {
     const MAX: usize = 100_000;
 }
+
+#[repr(C)]
+#[derive(Debug, Clone, Copy)]
+struct Uniforms {
+    transform: [f32; 16],
+    scale: f32,
+}
+
+impl Uniforms {
+    fn new(transformation: Transformation, scale: f32) -> Uniforms {
+        Self {
+            transform: *transformation.as_ref(),
+            scale,
+        }
+    }
+}
+
+impl Default for Uniforms {
+    fn default() -> Self {
+        Self {
+            transform: *Transformation::identity().as_ref(),
+            scale: 1.0,
+        }
+    }
+}

wgpu/src/renderer.rs

@@ -98,6 +98,7 @@ impl Renderer {
         log::debug!("Drawing");
 
         let (width, height) = target.dimensions();
+        let dpi = target.dpi();
         let transformation = target.transformation();
         let frame = target.next_frame();
 
@@ -137,7 +138,7 @@ impl Renderer {
         self.draw_overlay(overlay, &mut layers);
 
         for layer in layers {
-            self.flush(transformation, &layer, &mut encoder, &frame.view);
+            self.flush(dpi, transformation, &layer, &mut encoder, &frame.view);
         }
 
         self.queue.submit(&[encoder.finish()]);
@@ -190,7 +191,10 @@ impl Renderer {
 
                 layer.text.push(Section {
                     text: &content,
-                    screen_position: (x, y),
+                    screen_position: (
+                        x - layer.offset.x as f32,
+                        y - layer.offset.y as f32,
+                    ),
                     bounds: (bounds.width, bounds.height),
                     scale: wgpu_glyph::Scale { x: *size, y: *size },
                     color: color.into_linear(),
@@ -225,6 +229,7 @@ impl Renderer {
                 background,
                 border_radius,
             } => {
+                // TODO: Move some of this computations to the GPU (?)
                 layer.quads.push(Quad {
                     position: [
                         bounds.x - layer.offset.x as f32,
@@ -234,7 +239,7 @@ impl Renderer {
                     color: match background {
                         Background::Color(color) => color.into_linear(),
                     },
-                    border_radius: u32::from(*border_radius),
+                    border_radius: *border_radius as f32,
                 });
             }
             Primitive::Image { path, bounds } => {
@@ -308,35 +313,40 @@ impl Renderer {
 
     fn flush(
         &mut self,
+        dpi: f32,
         transformation: Transformation,
         layer: &Layer,
         encoder: &mut wgpu::CommandEncoder,
         target: &wgpu::TextureView,
     ) {
-        let translated = transformation
-            * Transformation::translate(
-                -(layer.offset.x as f32),
-                -(layer.offset.y as f32),
-            );
+        let bounds = layer.bounds * dpi;
 
         if layer.quads.len() > 0 {
             self.quad_pipeline.draw(
                 &mut self.device,
                 encoder,
                 &layer.quads,
                 transformation,
-                layer.bounds,
+                dpi,
+                bounds,
                 target,
             );
         }
 
         if layer.images.len() > 0 {
+            let translated_and_scaled = transformation
+                * Transformation::scale(dpi, dpi)
+                * Transformation::translate(
+                    -(layer.offset.x as f32),
+                    -(layer.offset.y as f32),
+                );
+
             self.image_pipeline.draw(
                 &mut self.device,
                 encoder,
                 &layer.images,
-                translated,
-                layer.bounds,
+                translated_and_scaled,
+                bounds,
                 target,
             );
         }
@@ -345,6 +355,20 @@ impl Renderer {
             let mut glyph_brush = self.glyph_brush.borrow_mut();
 
             for text in layer.text.iter() {
+                // Target physical coordinates directly to avoid blurry text
+                let text = Section {
+                    screen_position: (
+                        text.screen_position.0 * dpi,
+                        text.screen_position.1 * dpi,
+                    ),
+                    bounds: (text.bounds.0 * dpi, text.bounds.1 * dpi),
+                    scale: wgpu_glyph::Scale {
+                        x: text.scale.x * dpi,
+                        y: text.scale.y * dpi,
+                    },
+                    ..*text
+                };
+
                 glyph_brush.queue(text);
             }
 
@@ -353,12 +377,12 @@ impl Renderer {
                     &mut self.device,
                     encoder,
                     target,
-                    translated.into(),
+                    transformation.into(),
                     wgpu_glyph::Region {
-                        x: layer.bounds.x,
-                        y: layer.bounds.y,
-                        width: layer.bounds.width,
-                        height: layer.bounds.height,
+                        x: bounds.x,
+                        y: bounds.y,
+                        width: bounds.width,
+                        height: bounds.height,
                     },
                 )
                 .expect("Draw text");

wgpu/src/renderer/target.rs

@@ -6,6 +6,7 @@ pub struct Target {
     surface: wgpu::Surface,
     width: u16,
     height: u16,
+    dpi: f32,
     transformation: Transformation,
     swap_chain: wgpu::SwapChain,
 }
@@ -15,6 +16,10 @@ impl Target {
         (self.width, self.height)
     }
 
+    pub fn dpi(&self) -> f32 {
+        self.dpi
+    }
+
     pub fn transformation(&self) -> Transformation {
         self.transformation
     }
@@ -31,6 +36,7 @@ impl iced_native::renderer::Target for Target {
         window: &W,
         width: u16,
         height: u16,
+        dpi: f32,
         renderer: &Renderer,
     ) -> Target {
         let surface = wgpu::Surface::create(window);
@@ -41,14 +47,22 @@ impl iced_native::renderer::Target for Target {
             surface,
             width,
             height,
+            dpi,
             transformation: Transformation::orthographic(width, height),
             swap_chain,
         }
     }
 
-    fn resize(&mut self, width: u16, height: u16, renderer: &Renderer) {
+    fn resize(
+        &mut self,
+        width: u16,
+        height: u16,
+        dpi: f32,
+        renderer: &Renderer,
+    ) {
         self.width = width;
         self.height = height;
+        self.dpi = dpi;
         self.transformation = Transformation::orthographic(width, height);
         self.swap_chain =
             new_swap_chain(&self.surface, width, height, &renderer.device);

wgpu/src/renderer/widget/checkbox.rs

@@ -76,7 +76,7 @@ impl checkbox::Renderer for Renderer {
                         a: 1.0,
                     }
                 }),
-                border_radius: 6,
+                border_radius: 5,
             },
         );
 

wgpu/src/renderer/widget/text.rs

@@ -6,6 +6,9 @@ use wgpu_glyph::{GlyphCruncher, Section};
 use std::cell::RefCell;
 use std::f32;
 
+// TODO: Obtain from renderer configuration
+const DEFAULT_TEXT_SIZE: f32 = 20.0;
+
 impl text::Renderer for Renderer {
     fn node(&self, text: &Text) -> Node {
         let glyph_brush = self.glyph_brush.clone();
@@ -18,7 +21,7 @@ impl text::Renderer for Renderer {
         // 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 size = text.size.map(f32::from).unwrap_or(DEFAULT_TEXT_SIZE);
 
         let style = Style::default().width(text.width);
 
@@ -71,7 +74,7 @@ impl text::Renderer for Renderer {
         (
             Primitive::Text {
                 content: text.content.clone(),
-                size: f32::from(text.size.unwrap_or(20)),
+                size: text.size.map(f32::from).unwrap_or(DEFAULT_TEXT_SIZE),
                 bounds: layout.bounds(),
                 color: text.color.unwrap_or(Color::BLACK),
                 horizontal_alignment: text.horizontal_alignment,

wgpu/src/shader/quad.frag

@@ -3,7 +3,7 @@
 layout(location = 0) in vec4 v_Color;
 layout(location = 1) in vec2 v_Pos;
 layout(location = 2) in vec2 v_Scale;
-layout(location = 3) in flat uint v_BorderRadius;
+layout(location = 3) in float v_BorderRadius;
 
 layout(location = 0) out vec4 o_Color;
 
@@ -27,11 +27,7 @@ float rounded(in vec2 frag_coord, in vec2 position, in vec2 size, float radius,
 }
 
 void main() {
-    float radius_alpha = 1.0;
-
-    if(v_BorderRadius > 0.0) {
-        radius_alpha = rounded(gl_FragCoord.xy, v_Pos, v_Scale, v_BorderRadius, 0.5);
-    }
+    float radius_alpha = rounded(gl_FragCoord.xy, v_Pos, v_Scale, v_BorderRadius, 0.5);
 
     o_Color = vec4(v_Color.xyz, v_Color.w * radius_alpha);
 }