add debugging scale

crates/gosub_render_backend/src/lib.rs

@@ -77,10 +77,12 @@ pub trait RenderBackend: Sized + Debug {
 pub trait Scene<B: RenderBackend> {
     fn draw_rect(&mut self, rect: &RenderRect<B>);
     fn draw_text(&mut self, text: &RenderText<B>);
+
+    fn debug_draw_simple_text(&mut self, text: &str, pos: Point, size: FP);
     fn apply_scene(&mut self, scene: &B::Scene, transform: Option<B::Transform>);
     fn reset(&mut self);
 
-    fn new(data: &mut B::WindowData<'_>) -> Self;
+    fn new() -> Self;
 }
 
 pub struct RenderRect<B: RenderBackend> {

crates/gosub_render_backend/src/svg.rs

@@ -7,7 +7,7 @@ use crate::{ImageBuffer, RenderBackend};
 pub trait SvgRenderer<B: RenderBackend> {
     type SvgDocument;
 
-    fn new(wd: &mut B::WindowData<'_>) -> Self;
+    fn new() -> Self;
 
     fn parse_external(data: String) -> Result<Self::SvgDocument>;
     fn parse_internal(tree: DocumentHandle, id: NodeId) -> Result<Self::SvgDocument>;

crates/gosub_renderer/src/debug.rs

@@ -0,0 +1 @@
+pub mod scale;

crates/gosub_renderer/src/debug/scale.rs

@@ -0,0 +1,54 @@
+use gosub_render_backend::{
+    Brush, Color, Point, Rect, RenderBackend, RenderRect, Scene, SizeU32, Transform,
+};
+use std::cmp::max;
+use std::f32::consts::PI;
+
+pub fn px_scale<B: RenderBackend>(size: SizeU32, offset: Point, width: f32) -> B::Scene {
+    let mut scene = B::Scene::new();
+
+    let len = max(
+        size.width as i32 - offset.x as i32,
+        size.height as i32 - offset.y as i32,
+    ) as u32;
+
+    let scale = draw_scale::<B>(len, 50);
+
+    let transform = B::Transform::translate(offset.x, 0.0);
+
+    scene.apply_scene(&scale, Some(transform));
+
+    let transform = B::Transform::translate(width, offset.y).pre_rotate(PI / 2.0);
+
+    scene.apply_scene(&scale, Some(transform));
+
+    scene
+}
+
+pub fn draw_scale<B: RenderBackend>(len: u32, interval: u32) -> B::Scene {
+    let mut scene = B::Scene::new();
+
+    let mut x = 0;
+
+    while x < len {
+        let mut height = 50.0;
+
+        if x % 100 == 0 {
+            height = 60.0;
+        }
+
+        scene.draw_rect(&RenderRect {
+            rect: B::Rect::new(x as f32, 0.0, 2.0, height),
+            transform: None,
+            radius: None,
+            brush: B::Brush::color(Color::BLACK),
+            brush_transform: None,
+            border: None,
+        });
+
+        scene.debug_draw_simple_text(&format!("{}", x), Point::new(x as f32, height + 10.0), 12.0);
+        x += interval;
+    }
+
+    scene
+}

crates/gosub_renderer/src/draw.rs

@@ -3,6 +3,7 @@ use std::sync::mpsc::Sender;
 use anyhow::anyhow;
 use url::Url;
 
+use crate::debug::scale::px_scale;
 use crate::draw::img::request_img;
 use crate::render_tree::{load_html_rendertree, TreeDrawer};
 use gosub_css3::colors::RgbColor;
@@ -61,7 +62,7 @@ where
         if self.tree_scene.is_none() || self.size != Some(size) {
             self.size = Some(size);
 
-            let mut scene = B::Scene::new(data);
+            let mut scene = B::Scene::new();
 
             // Apply new maximums to the scene transform
             if let Some(scene_transform) = self.scene_transform.as_mut() {
@@ -78,7 +79,7 @@ where
             let mut drawer = Drawer {
                 scene: &mut scene,
                 drawer: self,
-                svg: B::SVGRenderer::new(data),
+                svg: B::SVGRenderer::new(),
             };
 
             drawer.render(size);
@@ -109,14 +110,30 @@ where
 
         if self.dirty {
             if let Some(id) = self.selected_element {
-                self.debug_annotate(id, data);
+                self.debug_annotate(id);
             }
         }
 
         if let Some(scene) = &self.debugger_scene {
             self.dirty = false;
             backend.apply_scene(data, scene, self.scene_transform.clone());
         }
+
+        if self.debug {
+            let pos = self
+                .scene_transform
+                .as_ref()
+                .map(|x| Point::new(x.tx(), x.ty()))
+                .unwrap_or(Point::ZERO);
+
+            let scale = px_scale::<B>(
+                size,
+                pos,
+                self.size.as_ref().map(|x| x.width as f32).unwrap_or(0.0),
+            );
+
+            backend.apply_scene(data, &scale, None);
+        }
     }
 
     fn mouse_move(&mut self, _backend: &mut B, data: &mut B::WindowData<'_>, x: FP, y: FP) -> bool {
@@ -135,7 +152,7 @@ where
             if self.last_hover != Some(e) {
                 self.last_hover = Some(e);
                 if self.debug {
-                    return self.debug_annotate(e, data);
+                    return self.debug_annotate(e);
                 }
             }
             return false;
@@ -740,12 +757,12 @@ fn get_border_side<B: RenderBackend, L: Layouter>(
 }
 
 impl<B: RenderBackend, L: Layouter> TreeDrawer<B, L> {
-    fn debug_annotate(&mut self, e: NodeId, data: &mut B::WindowData<'_>) -> bool {
+    fn debug_annotate(&mut self, e: NodeId) -> bool {
         let Some(node) = self.tree.get_node(e) else {
             return false;
         };
 
-        let mut scene = B::Scene::new(data);
+        let mut scene = B::Scene::new();
 
         let Some(layout) = self.tree.get_layout(e) else {
             return false;

crates/gosub_renderer/src/lib.rs

@@ -1,2 +1,3 @@
+mod debug;
 pub mod draw;
 pub mod render_tree;

crates/gosub_svg/src/resvg.rs

@@ -15,7 +15,7 @@ pub struct Resvg;
 impl<B: RenderBackend> SvgRenderer<B> for Resvg {
     type SvgDocument = SVGDocument;
 
-    fn new(_: &mut B::WindowData<'_>) -> Self {
+    fn new() -> Self {
         Self
     }
 

crates/gosub_typeface/src/lib.rs

@@ -308,3 +308,5 @@
 // }
 
 pub mod font;
+
+pub const ROBOTO_FONT: &[u8] = include_bytes!("../../../resources/fonts/Roboto-Regular.ttf");

crates/gosub_vello/src/debug.rs

@@ -0,0 +1 @@
+pub mod text;

crates/gosub_vello/src/debug/text.rs

@@ -0,0 +1,113 @@
+use crate::{Brush, Color, Scene, Transform};
+use gosub_render_backend::{Brush as _, Color as _, Transform as _};
+use gosub_shared::types::Point;
+use gosub_typeface::ROBOTO_FONT;
+use std::sync::{Arc, LazyLock};
+use vello::glyph::Glyph;
+use vello::peniko::{Blob, BrushRef, Fill, Font, Style, StyleRef};
+use vello::skrifa;
+use vello::skrifa::{FontRef, MetadataProvider};
+
+static FONT: LazyLock<Font> = LazyLock::new(|| Font::new(Blob::new(Arc::new(ROBOTO_FONT)), 0));
+
+pub fn render_text_simple(scene: &mut Scene, text: &str, point: Point<f32>, font_size: f32) {
+    render_text(
+        scene,
+        text,
+        point,
+        font_size,
+        &*FONT,
+        &Brush::color(Color::BLACK),
+        &Style::Fill(Fill::NonZero),
+    );
+}
+
+pub fn render_text<'a>(
+    scene: &mut Scene,
+    text: &str,
+    point: Point<f32>,
+    font_size: f32,
+    font: &Font,
+    brush: &Brush,
+    style: impl Into<StyleRef<'a>>,
+) {
+    let transform = Transform::translate(point.x, point.y);
+
+    render_text_var(
+        scene,
+        text,
+        font_size,
+        font,
+        brush,
+        transform,
+        Transform::IDENTITY,
+        style,
+        &[],
+    )
+}
+
+pub fn render_text_var<'a>(
+    scene: &mut Scene,
+    text: &str,
+    font_size: f32,
+    font: &Font,
+    brush: &Brush,
+    transform: Transform,
+    glyph_transform: Transform,
+    style: impl Into<StyleRef<'a>>,
+    vars: &[(&str, f32)],
+) {
+    let Some(font_ref) = to_font_ref(font) else {
+        return;
+    };
+    let brush: BrushRef = (&brush.0).into();
+    let style = style.into();
+    let axes = font_ref.axes();
+    let var_loc = axes.location(vars.iter().copied());
+    let charmap = font_ref.charmap();
+
+    let fs = skrifa::instance::Size::new(font_size);
+
+    let metrics = font_ref.metrics(fs, &var_loc);
+    let line_height = metrics.ascent - metrics.descent + metrics.leading;
+    let glyph_metrics = font_ref.glyph_metrics(fs, &var_loc);
+    let mut pen_x = 0f32;
+    let mut pen_y = 0f32;
+    scene
+        .0
+        .draw_glyphs(font)
+        .font_size(font_size)
+        .transform(transform.0)
+        .glyph_transform(Some(glyph_transform.0))
+        .normalized_coords(var_loc.coords())
+        .brush(brush)
+        .hint(false)
+        .draw(
+            style,
+            text.chars().filter_map(|ch| {
+                if ch == '\n' {
+                    pen_y += line_height;
+                    pen_x = 0.0;
+                    return None;
+                }
+                let gid = charmap.map(ch).unwrap_or_default();
+                let advance = glyph_metrics.advance_width(gid).unwrap_or_default();
+                let x = pen_x;
+                pen_x += advance;
+                Some(Glyph {
+                    id: gid.to_u16() as u32,
+                    x,
+                    y: pen_y,
+                })
+            }),
+        );
+}
+
+fn to_font_ref(font: &Font) -> Option<FontRef<'_>> {
+    use vello::skrifa::raw::FileRef;
+    let file_ref = FileRef::new(font.data.as_ref()).ok()?;
+    match file_ref {
+        FileRef::Font(font) => Some(font),
+        FileRef::Collection(collection) => collection.get(font.index).ok(),
+    }
+}

crates/gosub_vello/src/lib.rs

@@ -32,8 +32,10 @@ mod scene;
 mod text;
 mod transform;
 
+mod debug;
 #[cfg(feature = "vello_svg")]
 mod vello_svg;
+
 pub struct VelloBackend;
 
 impl Debug for VelloBackend {

crates/gosub_vello/src/scene.rs

@@ -2,8 +2,9 @@ use vello::kurbo::RoundedRect;
 use vello::peniko::Fill;
 use vello::Scene as VelloScene;
 
-use gosub_render_backend::{RenderBackend, RenderRect, RenderText, Scene as TScene};
+use gosub_render_backend::{Point, RenderBackend, RenderRect, RenderText, Scene as TScene, FP};
 
+use crate::debug::text::render_text_simple;
 use crate::{Border, BorderRenderOptions, Text, Transform, VelloBackend};
 
 pub struct Scene(pub(crate) VelloScene);
@@ -12,6 +13,10 @@ impl Scene {
     pub fn inner(&mut self) -> &mut VelloScene {
         &mut self.0
     }
+
+    pub fn create() -> Self {
+        Self(VelloScene::new())
+    }
 }
 
 impl TScene<VelloBackend> for Scene {
@@ -46,6 +51,10 @@ impl TScene<VelloBackend> for Scene {
         Text::show(&mut self.0, text)
     }
 
+    fn debug_draw_simple_text(&mut self, text: &str, pos: Point, size: FP) {
+        render_text_simple(self, text, pos, size)
+    }
+
     fn apply_scene(
         &mut self,
         scene: &<VelloBackend as RenderBackend>::Scene,
@@ -62,7 +71,7 @@ impl TScene<VelloBackend> for Scene {
         self.0.reset()
     }
 
-    fn new(_data: &mut <VelloBackend as RenderBackend>::WindowData<'_>) -> Self {
+    fn new() -> Self {
         VelloScene::new().into()
     }
 }

crates/gosub_vello/src/vello_svg.rs

@@ -13,7 +13,7 @@ pub struct VelloSVG;
 impl SvgRenderer<VelloBackend> for VelloSVG {
     type SvgDocument = SVGDocument;
 
-    fn new(_: &mut WindowData) -> Self {
+    fn new() -> Self {
         Self
     }