✨ Export image fills to WASM SVG as linked images (#11529)

Emit clipped `<image href>` for fills with a registered media URL instead
of Skia base64 embeds. Register URLs from the frontend and exporter via
store_image_url. Cover rect, path, frame, and text (glyph clip) cases in
SVG export tests.

Closes #11383

exporter/src/app/wasm.cljs

@@ -25,6 +25,7 @@
    [app.common.uuid :as uuid]
    ;; Required for side effects: binds the generated enums.
    [app.wasm.enums]
+   [cuerdas.core :as str]
    [promesa.core :as p]
    [shadow.esm :refer [dynamic-import]]))
 
@@ -190,6 +191,22 @@
                         (aget buf 0) (aget buf 1) (aget buf 2) (aget buf 3)
                         false)))))
 
+(defn store-image-url!
+  "Registers the public URL an image was loaded from. The SVG export emits
+  linked `<image href>` from these, and falls back to Skia base64 when missing,
+  so this should run for every media id the scene references (including
+  already-cached images).
+
+  Does NOT call `mem/free`, for the same reason as `store-font-url!`."
+  [image-id url]
+  (when (and (some? url) (not (str/blank? url)))
+    (let [bytes (js/Buffer.from url "utf-8")
+          ptr   (mem/alloc (.-byteLength bytes))
+          quart (uuid/get-u32 image-id)]
+      (mem/write-buffer ptr (mem/get-heap-u8) bytes)
+      (h/call wasm/internal-module "_store_image_url"
+              (aget quart 0) (aget quart 1) (aget quart 2) (aget quart 3)))))
+
 (defn store-image!
   "Uploads one image's *encoded* bytes (PNG/JPEG — Skia decodes, no WebGL) into
   the WASM image store via `_store_image`. Buffer layout matches the Rust reader:

exporter/src/app/wasm/render.cljs

@@ -369,13 +369,18 @@
   "Fetches and stores every image the scene references (shape, stroke and
   text-span fills, enumerated by `app.common.types.shape.images`). Unlike fonts,
   the image store is not reset per request, so already-held images are skipped
-  and repeated exports of a file reuse them."
+  and repeated exports of a file reuse them.
+
+  Always registers a public media URL for each id so SVG export can emit linked
+  `<image href>` even when the encoded bytes were already cached."
   [scene params]
   (let [all-ids (images/scene-image-ids scene)
         new-ids (remove wasm/image-cached? all-ids)]
     (l/dbg :hint "wasm render: provisioning images"
            :total (count all-ids)
            :cached (- (count all-ids) (count new-ids)))
+    (doseq [image-id all-ids]
+      (wasm/store-image-url! image-id (public-uri (str "assets/by-file-media-id/" image-id))))
     (->> new-ids
          (map (fn [image-id]
                 (->> (fetch-file-media-bytes image-id params)

frontend/src/app/render_wasm/api.cljs

@@ -880,6 +880,25 @@
            (h/call wasm/internal-module "_store_image")
            true)))))
 
+(defn- store-image-url!
+  "Registers the public URL an image was loaded from so SVG export can emit a
+   linked `<image href>` instead of a Skia base64 embed."
+  [image-id url]
+  (when (and (wasm/live?) (some? url) (not (str/blank? url)))
+    (let [buffer (uuid/get-u32 image-id)
+          encoder (js/TextEncoder.)
+          encoded (.encode encoder url)
+          size (.-byteLength encoded)
+          offset (mem/alloc size)
+          heap (mem/get-heap-u8)]
+      (.set heap encoded offset)
+      (h/call wasm/internal-module "_store_image_url"
+              (aget buffer 0)
+              (aget buffer 1)
+              (aget buffer 2)
+              (aget buffer 3))
+      true)))
+
 (defn- store-image-texture
   "Creates a WebGL texture from a decoded image and passes the texture ID to
    WASM. This avoids decoding the image twice (once in browser, once in WASM)."
@@ -922,6 +941,7 @@
    so Skia rasterizes them."
   [shape-id image-id thumbnail?]
   (let [url (cf/resolve-file-media {:id image-id} thumbnail?)]
+    (store-image-url! image-id url)
     {:key url
      :thumbnail? thumbnail?
      :callback
@@ -959,6 +979,8 @@
                                 (aget buffer 2)
                                 (aget buffer 3)
                                 thumbnail?)]
+      ;; Always register the URL (SVG export needs it even when bytes are cached).
+      (store-image-url! id (cf/resolve-file-media {:id id} thumbnail?))
       (when (zero? cached-image?)
         (fetch-image shape-id id thumbnail?)))))
 
@@ -993,6 +1015,7 @@
                                            (aget buffer 2)
                                            (aget buffer 3)
                                            thumbnail?)]
+                 (store-image-url! id (cf/resolve-file-media {:id id} thumbnail?))
                  (when (zero? cached-image?)
                    (fetch-image shape-id id thumbnail?))))
              (types.fills/get-image-ids fills))))))
@@ -1021,6 +1044,7 @@
                                          (aget buffer 2)
                                          (aget buffer 3)
                                          thumbnail?)]
+               (store-image-url! image-id (cf/resolve-file-media {:id image-id} thumbnail?))
                (when (zero? cached-image?)
                  (fetch-image shape-id image-id thumbnail?))))
            image-ids))))

render-wasm/preview-snapshots

@@ -12,6 +12,7 @@
 #
 # Text snapshots reference `fonts/sourcesanspro-regular.ttf`; this script copies
 # the bundled font into `target/svg-preview/fonts/` so the gallery renders text.
+# Image-fill snapshots reference `images/test-fill.svg`; same idea for fills.
 #
 # When a test produced a pending change there will be a `*.snap.new` next to the
 # accepted `*.snap`; the gallery then shows "accepted" vs "new" side by side.
@@ -27,10 +28,14 @@ OUT_DIR="$SCRIPT_DIR/target/svg-preview"
 OUT="$OUT_DIR/index.html"
 FONT_SRC="$SCRIPT_DIR/src/fonts/sourcesanspro-regular.ttf"
 FONT_DIR="$OUT_DIR/fonts"
+IMAGE_SRC="$SCRIPT_DIR/src/render/svg/fixtures/test-fill.svg"
+IMAGE_DIR="$OUT_DIR/images"
 
 mkdir -p "$OUT_DIR"
 mkdir -p "$FONT_DIR"
+mkdir -p "$IMAGE_DIR"
 cp "$FONT_SRC" "$FONT_DIR/"
+cp "$IMAGE_SRC" "$IMAGE_DIR/"
 
 # Prints the SVG body of a snapshot file: everything after the second `---`
 # line (the YAML front matter insta writes).

render-wasm/src/render/images.rs

@@ -82,6 +82,9 @@ pub struct ImageStore {
     tick: Cell<u64>,
     /// gpu-only
     context: Option<Box<DirectContext>>,
+    /// Source URL registered when the image was fetched (SVG export references
+    /// this in linked `<image>` elements).
+    source_urls: HashMap<Uuid, String>,
 }
 
 /// Creates a Skia image from an existing WebGL texture.
@@ -227,6 +230,7 @@ impl ImageStore {
             total_bytes: 0,
             tick: Cell::new(0),
             context: Some(Box::new(context.clone())),
+            source_urls: HashMap::new(),
         }
     }
 
@@ -239,6 +243,7 @@ impl ImageStore {
             total_bytes: 0,
             tick: Cell::new(0),
             context: None,
+            source_urls: HashMap::new(),
         }
     }
 
@@ -476,4 +481,14 @@ impl ImageStore {
             None
         }
     }
+
+    pub(crate) fn set_source_url(&mut self, id: Uuid, url: String) {
+        if !url.is_empty() {
+            self.source_urls.insert(id, url);
+        }
+    }
+
+    pub(crate) fn source_url(&self, id: &Uuid) -> Option<&str> {
+        self.source_urls.get(id).map(String::as_str)
+    }
 }

render-wasm/src/render/svg/document.rs

@@ -16,7 +16,7 @@ use crate::render::vector::draw_shape_geometry;
 
 /// Accumulates the SVG document body while drawing.
 pub(crate) struct SvgLayerCanvas {
-    pub(super) scale: f32,
+    scale: f32,
     page_rect: skia::Rect,
     tx: f32,
     ty: f32,
@@ -97,6 +97,28 @@ impl SvgLayerCanvas {
         self.out.push_str("</g>");
     }
 
+    /// Appends raw SVG markup to the body (flushes any pending Skia fragment first).
+    pub(super) fn push_raw(&mut self, markup: &str) {
+        self.flush();
+        self.out.push_str(markup);
+    }
+
+    /// CTM for leaf content placed in page space: Scale * Translate * Centered.
+    pub(super) fn page_shape_matrix_attr(&self, shape: &Shape) -> String {
+        let mut ctm = skia::Matrix::scale((self.scale, self.scale));
+        ctm = ctm * skia::Matrix::translate((self.tx, self.ty));
+        ctm = ctm * shape.centered_transform();
+        format!(
+            "matrix({} {} {} {} {} {})",
+            ctm.scale_x(),
+            ctm.skew_y(),
+            ctm.skew_x(),
+            ctm.scale_y(),
+            ctm.translate_x(),
+            ctm.translate_y()
+        )
+    }
+
     /// Emits a `<clipPath>` from a shape's geometry (in device/page space).
     ///
     /// A mask can be a group too. Since a group has no geometry of its own, we

render-wasm/src/render/svg/fixtures.rs

@@ -5,7 +5,7 @@ use skia_safe as skia;
 use crate::globals::TestRenderResourcesGuard;
 use crate::render::{FontStore, RenderResources};
 use crate::shapes::{
-    Fill, FontFamily, FontStyle, Frame, Group, GrowType, Paragraph, Path, Rect, Segment,
+    Fill, FontFamily, FontStyle, Frame, Group, GrowType, ImageFill, Paragraph, Path, Rect, Segment,
     SolidColor, Stroke, StrokeKind, StrokeStyle, TextAlign, TextContent, TextDirection, TextSpan,
     Type,
 };
@@ -18,6 +18,10 @@ use super::render_tree_to_svg;
 /// Font URL referenced in exported SVG `@font-face` rules.
 pub(super) const TEST_FONT_URL: &str = "fonts/sourcesanspro-regular.ttf";
 
+/// Media URL referenced by linked `<image href>` fills in SVG export tests.
+/// Relative path so `./preview-snapshots` can resolve it under `target/svg-preview/`.
+pub(super) const TEST_IMAGE_URL: &str = "images/test-fill.svg";
+
 fn register_test_font_urls(fonts: &mut FontStore) {
     let family = FontFamily::new(Uuid::nil(), 400, FontStyle::Normal);
     fonts.set_source_url(&family.alias(), TEST_FONT_URL.to_string());
@@ -28,6 +32,31 @@ pub(super) fn uid(n: u32) -> Uuid {
     uuid_from_u32_quartet(0, 0, 0, n)
 }
 
+/// Adds a rectangle filled with a linked image (must call `render_with` / register URL).
+pub(super) fn add_image_rect(
+    pool: &mut ShapesPool,
+    id: Uuid,
+    parent: Uuid,
+    (l, t, r, b): (f32, f32, f32, f32),
+    image_id: Uuid,
+    keep_aspect_ratio: bool,
+    opacity: u8,
+) {
+    add_rect_with_fills(
+        pool,
+        id,
+        parent,
+        (l, t, r, b),
+        vec![Fill::Image(ImageFill::new(
+            image_id,
+            opacity,
+            200,
+            100,
+            keep_aspect_ratio,
+        ))],
+    );
+}
+
 /// Adds a solid-filled rectangle to the pool.
 pub(super) fn add_solid_rect(
     pool: &mut ShapesPool,
@@ -68,15 +97,101 @@ pub(super) fn add_frame(
     (l, t, r, b): (f32, f32, f32, f32),
     color: skia::Color,
     clip: bool,
+) {
+    add_frame_with_fills(
+        pool,
+        id,
+        parent,
+        (l, t, r, b),
+        vec![Fill::Solid(SolidColor(color))],
+        clip,
+    );
+}
+
+fn add_frame_with_fills(
+    pool: &mut ShapesPool,
+    id: Uuid,
+    parent: Uuid,
+    (l, t, r, b): (f32, f32, f32, f32),
+    fills: Vec<Fill>,
+    clip: bool,
 ) {
     let shape = pool.add_shape(id);
     shape.set_parent(parent);
     shape.set_shape_type(Type::Frame(Frame::default()));
     shape.set_selrect(l, t, r, b);
-    shape.set_fills(vec![Fill::Solid(SolidColor(color))]);
+    shape.set_fills(fills);
     shape.set_clip(clip);
 }
 
+/// Frame whose background is a linked image fill.
+pub(super) fn add_image_frame(
+    pool: &mut ShapesPool,
+    id: Uuid,
+    parent: Uuid,
+    (l, t, r, b): (f32, f32, f32, f32),
+    image_id: Uuid,
+    clip: bool,
+) {
+    add_frame_with_fills(
+        pool,
+        id,
+        parent,
+        (l, t, r, b),
+        vec![test_image_fill(image_id)],
+        clip,
+    );
+}
+
+fn triangle_segments(closed: bool) -> Vec<Segment> {
+    let mut segments = vec![
+        Segment::MoveTo((10.0, 90.0)),
+        Segment::LineTo((50.0, 10.0)),
+        Segment::LineTo((90.0, 90.0)),
+    ];
+    if closed {
+        segments.push(Segment::Close);
+    }
+    segments
+}
+
+fn add_path_with_fills(
+    pool: &mut ShapesPool,
+    id: Uuid,
+    parent: Uuid,
+    (l, t, r, b): (f32, f32, f32, f32),
+    segments: Vec<Segment>,
+    fills: Vec<Fill>,
+) {
+    let shape = pool.add_shape(id);
+    shape.set_parent(parent);
+    shape.set_shape_type(Type::Path(Path::new(segments)));
+    shape.set_selrect(l, t, r, b);
+    shape.set_fills(fills);
+}
+
+fn test_image_fill(image_id: Uuid) -> Fill {
+    Fill::Image(ImageFill::new(image_id, 255, 200, 100, true))
+}
+
+/// Triangle path (open or closed) with a linked image fill.
+pub(super) fn add_image_path(
+    pool: &mut ShapesPool,
+    id: Uuid,
+    parent: Uuid,
+    closed: bool,
+    image_id: Uuid,
+) {
+    add_path_with_fills(
+        pool,
+        id,
+        parent,
+        (0.0, 0.0, 100.0, 100.0),
+        triangle_segments(closed),
+        vec![test_image_fill(image_id)],
+    );
+}
+
 /// Adds an empty (unmasked) group.
 pub(super) fn add_group(
     pool: &mut ShapesPool,
@@ -249,9 +364,39 @@ fn stroke_with_style(
     stroke
 }
 
+/// Text with a linked image fill (register URL via `render_with`).
+pub(super) fn add_image_text(
+    pool: &mut ShapesPool,
+    id: Uuid,
+    bounds: (f32, f32, f32, f32),
+    text: &str,
+    font_size: f32,
+    image_id: Uuid,
+) {
+    add_text_with_fills(
+        pool,
+        id,
+        bounds,
+        text,
+        font_size,
+        vec![test_image_fill(image_id)],
+    );
+}
+
 pub(super) fn render(pool: &ShapesPool, root: Uuid) -> String {
+    render_with(pool, root, |_resources| {})
+}
+
+/// Like [`render`], but lets the test register extra resources (e.g. image URLs)
+/// before export.
+pub(super) fn render_with(
+    pool: &ShapesPool,
+    root: Uuid,
+    setup: impl FnOnce(&mut RenderResources),
+) -> String {
     let mut resources = RenderResources::try_new_headless().expect("headless resources");
     register_test_font_urls(&mut resources.fonts);
+    setup(&mut resources);
     let _guard = TestRenderResourcesGuard::install(&mut resources);
     let bytes = render_tree_to_svg(&mut resources, &root, pool, 1.0).expect("svg export");
     String::from_utf8(bytes).expect("utf8 svg")

render-wasm/src/render/svg/fixtures/test-fill.svg

@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="200" height="100" viewBox="0 0 200 100">
+  <defs>
+    <linearGradient id="g" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0%" stop-color="#2563eb"/>
+      <stop offset="100%" stop-color="#7c3aed"/>
+    </linearGradient>
+  </defs>
+  <rect width="200" height="100" fill="url(#g)"/>
+  <circle cx="60" cy="50" r="28" fill="#fbbf24"/>
+  <rect x="110" y="22" width="70" height="56" rx="8" fill="#f8fafc" opacity="0.9"/>
+  <text x="145" y="58" text-anchor="middle" font-family="system-ui,sans-serif" font-size="22" font-weight="700" fill="#1e293b">IMG</text>
+</svg>

render-wasm/src/render/svg/frames.rs

@@ -5,6 +5,7 @@ use crate::shapes::{Shape, Stroke};
 use crate::state::ShapesPoolRef;
 
 use super::document::{effect_attrs, SvgLayerCanvas};
+use super::images::emit_fills;
 use super::render_tree;
 use crate::render::RenderResources;
 
@@ -29,14 +30,9 @@ pub(super) fn render_frame(
         builder.open_group(&format!("clip-path=\"url(#{clip_id})\""));
     }
 
-    // Frame background (frame space).
+    // Frame background (frame space), with linked `<image>` for image fills.
     if !element.fills.is_empty() {
-        let canvas = builder.canvas();
+        emit_fills(builder, shared, element, &element.fills, tree, scale)?;
-        canvas.save();
-        canvas.concat(&matrix);
-        let mut renderer = VectorRenderer::new(canvas, shared, scale, false);
-        renderer.draw_fills(element, &element.fills)?;
-        canvas.restore();
     }
 
     // Children (absolute coords).

render-wasm/src/render/svg/images.rs

@@ -0,0 +1,109 @@
+use crate::error::Result;
+use crate::render::shape_renderer::ShapeRenderer;
+use crate::render::vector::VectorRenderer;
+use crate::shapes::{Fill, ImageFill, Shape};
+use crate::state::ShapesPoolRef;
+
+use super::document::SvgLayerCanvas;
+use crate::render::RenderResources;
+
+/// Emits fills bottom -> top for SVG export.
+///
+/// Non-image fills go through Skia's SVG canvas. Image fills with a registered
+/// source URL become native linked `<image>` elements (see `store_image_url`);
+/// without a URL they fall back to Skia (base64-embed) when a CPU image exists.
+pub(super) fn emit_fills(
+    builder: &mut SvgLayerCanvas,
+    shared: &mut RenderResources,
+    shape: &Shape,
+    fills: &[Fill],
+    tree: ShapesPoolRef,
+    scale: f32,
+) -> Result<()> {
+    if fills.is_empty() {
+        return Ok(());
+    }
+
+    // fills[0] is the topmost layer; draw bottom → top.
+    for fill in fills.iter().rev() {
+        match fill {
+            Fill::Image(image_fill) if shared.images.source_url(&image_fill.id()).is_some() => {
+                emit_image_fill(builder, shared, shape, image_fill, tree)?;
+            }
+            fill => {
+                let matrix = shape.centered_transform();
+                let canvas = builder.canvas();
+                canvas.save();
+                canvas.concat(&matrix);
+                let mut renderer = VectorRenderer::new(canvas, shared, scale, false);
+                renderer.draw_fills(shape, std::slice::from_ref(fill))?;
+                canvas.restore();
+            }
+        }
+    }
+    Ok(())
+}
+
+/// Emits a linked SVG `<image>` clipped to the shape geometry.
+///
+/// Skia's SVG backend would base64-embed a PNG from `draw_image_rect`; we emit
+/// a native `<image href="...">` instead so the export stays linked to the
+/// registered media URL (see `store_image_url`).
+fn emit_image_fill(
+    builder: &mut SvgLayerCanvas,
+    shared: &RenderResources,
+    shape: &Shape,
+    image_fill: &ImageFill,
+    tree: ShapesPoolRef,
+) -> Result<()> {
+    let Some(url) = shared.images.source_url(&image_fill.id()) else {
+        return Ok(());
+    };
+
+    let clip_id = builder.unique("imgclip");
+    builder.push_clip_path(&clip_id, shape, tree);
+    let href = xml_escape_attr(url);
+    emit_linked_image_element(builder, shape, image_fill, &href, &clip_id);
+    Ok(())
+}
+
+/// Emits `<g clip-path>` + `<image href>` using the shape selrect and page CTM.
+pub(super) fn emit_linked_image_element(
+    builder: &mut SvgLayerCanvas,
+    shape: &Shape,
+    image_fill: &ImageFill,
+    href: &str,
+    clip_id: &str,
+) {
+    let selrect = shape.selrect();
+    let opacity = image_fill.opacity() as f32 / 255.0;
+    let preserve = if image_fill.keep_aspect_ratio() {
+        "xMidYMid slice"
+    } else {
+        "none"
+    };
+    let transform = builder.page_shape_matrix_attr(shape);
+
+    let opacity_attr = if (opacity - 1.0).abs() < f32::EPSILON {
+        String::new()
+    } else {
+        format!(r#" opacity="{opacity}""#)
+    };
+
+    builder.open_group(&format!("clip-path=\"url(#{clip_id})\""));
+    builder.push_raw(&format!(
+        r#"<image href="{href}" x="{}" y="{}" width="{}" height="{}" preserveAspectRatio="{preserve}"{opacity_attr} transform="{transform}"/>"#,
+        selrect.left(),
+        selrect.top(),
+        selrect.width(),
+        selrect.height(),
+    ));
+    builder.close_group();
+}
+
+pub(super) fn xml_escape_attr(s: &str) -> String {
+    s.replace('&', "&amp;")
+        .replace('"', "&quot;")
+        .replace('<', "&lt;")
+        .replace('>', "&gt;")
+}

render-wasm/src/render/svg/mod.rs

@@ -8,7 +8,8 @@ use crate::shapes::{Shape, Type};
 use crate::state::ShapesPoolRef;
 use crate::uuid::Uuid;
 
-use super::vector::{render_leaf_content, VectorRenderer};
+use super::shape_renderer::ShapeRenderer;
+use super::vector::VectorRenderer;
 use super::RenderResources;
 
 /// Collects the registered font aliases used by every text span in the subtree
@@ -125,6 +126,7 @@ pub(crate) fn render_tree_to_svg(
 mod document;
 mod frames;
 mod groups;
+mod images;
 mod text;
 
 use document::SvgLayerCanvas;
@@ -133,6 +135,7 @@ use groups::render_group;
 use text::render_text_fill;
 
 use document::effect_attrs;
+use images::emit_fills;
 
 /// Renders `id`'s subtree to an SVG body, returning `(defs, body)`.
 fn render_body(
@@ -172,7 +175,7 @@ fn render_tree(
         | Type::Path(_)
         | Type::Bool(_)
         | Type::Text(_)
-        | Type::SVGRaw(_) => render_leaf(builder, shared, element, scale),
+        | Type::SVGRaw(_) => render_leaf(builder, shared, element, tree, scale),
     }
 }
 
@@ -180,6 +183,7 @@ fn render_leaf(
     builder: &mut SvgLayerCanvas,
     shared: &mut RenderResources,
     element: &Shape,
+    tree: ShapesPoolRef,
     scale: f32,
 ) -> Result<()> {
     let effects = effect_attrs(element);
@@ -189,14 +193,26 @@ fn render_leaf(
 
     {
         if matches!(element.shape_type, Type::Text(_)) {
-            render_text_fill(builder, element)?;
+            render_text_fill(builder, shared, element)?;
         } else {
+            emit_fills(builder, shared, element, &element.fills, tree, scale)?;
+
             let matrix = element.centered_transform();
             let canvas = builder.canvas();
             canvas.save();
             canvas.concat(&matrix);
             let mut renderer = VectorRenderer::new(canvas, shared, scale, false);
-            render_leaf_content(&mut renderer, element)?;
+            renderer.draw_fill_inner_shadows(element)?;
+
+            let visible_strokes: Vec<_> = element.visible_strokes().collect();
+            if !visible_strokes.is_empty() {
+                renderer.draw_strokes(element, &visible_strokes)?;
+                if !element.has_fills() {
+                    for stroke in &visible_strokes {
+                        renderer.draw_stroke_inner_shadows(element, stroke)?;
+                    }
+                }
+            }
             canvas.restore();
         }
     }

render-wasm/src/render/svg/snapshots/render_wasm__render__svg__tests__exports_image_fill_as_linked_image.snap

@@ -0,0 +1,8 @@
+---
+source: src/render/svg/tests.rs
+expression: svg
+---
+<?xml version="1.0" encoding="utf-8" ?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="100" height="80" viewBox="0 0 100 80"><defs><clipPath id="imgclip0" clipPathUnits="userSpaceOnUse">
+	<rect width="100" height="80"/>
+</clipPath></defs><g clip-path="url(#imgclip0)"><image href="images/test-fill.svg" x="0" y="0" width="100" height="80" preserveAspectRatio="xMidYMid slice" transform="matrix(1 0 0 1 0 0)"/></g></svg>

render-wasm/src/render/svg/snapshots/render_wasm__render__svg__tests__exports_image_fill_on_closed_path.snap

@@ -0,0 +1,8 @@
+---
+source: src/render/svg/tests.rs
+expression: svg
+---
+<?xml version="1.0" encoding="utf-8" ?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="80" height="80" viewBox="0 0 80 80"><defs><clipPath id="imgclip0" clipPathUnits="userSpaceOnUse">
+	<path transform="translate(-10 -10)" d="M10 90L50 10L90 90L10 90Z"/>
+</clipPath></defs><g clip-path="url(#imgclip0)"><image href="images/test-fill.svg" x="0" y="0" width="100" height="100" preserveAspectRatio="xMidYMid slice" transform="matrix(1 0 0 1 -10 -10)"/></g></svg>

render-wasm/src/render/svg/snapshots/render_wasm__render__svg__tests__exports_image_fill_on_frame.snap

@@ -0,0 +1,8 @@
+---
+source: src/render/svg/tests.rs
+expression: svg
+---
+<?xml version="1.0" encoding="utf-8" ?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="200" height="120" viewBox="0 0 200 120"><defs><clipPath id="imgclip0" clipPathUnits="userSpaceOnUse">
+	<rect width="200" height="120"/>
+</clipPath></defs><g clip-path="url(#imgclip0)"><image href="images/test-fill.svg" x="0" y="0" width="200" height="120" preserveAspectRatio="xMidYMid slice" transform="matrix(1 0 0 1 0 0)"/></g></svg>

render-wasm/src/render/svg/snapshots/render_wasm__render__svg__tests__exports_image_fill_on_open_path.snap

@@ -0,0 +1,8 @@
+---
+source: src/render/svg/tests.rs
+expression: svg
+---
+<?xml version="1.0" encoding="utf-8" ?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="80" height="80" viewBox="0 0 80 80"><defs><clipPath id="imgclip0" clipPathUnits="userSpaceOnUse">
+	<path transform="translate(-10 -10)" d="M10 90L50 10L90 90"/>
+</clipPath></defs><g clip-path="url(#imgclip0)"><image href="images/test-fill.svg" x="0" y="0" width="100" height="100" preserveAspectRatio="xMidYMid slice" transform="matrix(1 0 0 1 -10 -10)"/></g></svg>

render-wasm/src/render/svg/snapshots/render_wasm__render__svg__tests__exports_image_fill_on_text.snap

@@ -0,0 +1,11 @@
+---
+source: src/render/svg/tests.rs
+assertion_line: 306
+expression: svg
+---
+<?xml version="1.0" encoding="utf-8" ?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="560" height="240" viewBox="0 0 560 240"><defs><style type="text/css"><![CDATA[@font-face{font-family:"Source Sans Pro";font-style:normal;font-weight:400;src:url("fonts/sourcesanspro-regular.ttf") format("truetype");}]]></style><clipPath id="txtimgclip0" clipPathUnits="userSpaceOnUse">
+	<text font-size="200" font-family="Source Sans Pro" x="0, 130.37109, 263.08594, 360.83984" y="181">
+			HOLA
+	</text>
+</clipPath></defs><g clip-path="url(#txtimgclip0)"><image href="images/test-fill.svg" x="0" y="0" width="560" height="240" preserveAspectRatio="xMidYMid slice" transform="matrix(1 0 0 1 0 0)"/></g></svg>

render-wasm/src/render/svg/snapshots/render_wasm__render__svg__tests__exports_mixed_solid_and_image_fills_in_order.snap

@@ -0,0 +1,10 @@
+---
+source: src/render/svg/tests.rs
+expression: svg
+---
+<?xml version="1.0" encoding="utf-8" ?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="408" height="128" viewBox="0 0 408 128"><defs><clipPath id="imgclip0" clipPathUnits="userSpaceOnUse">
+	<rect transform="translate(-100 -50)" x="100" y="50" width="408" height="128"/>
+</clipPath></defs><g clip-path="url(#imgclip0)"><image href="images/test-fill.svg" x="100" y="50" width="408" height="128" preserveAspectRatio="none" opacity="0.5019608" transform="matrix(1 0 0 1 -100 -50)"/></g>
+	<rect fill="#003FFF" fill-opacity="0.50196081" transform="translate(-100 -50)" x="100" y="50" width="408" height="128"/>
+</svg>

render-wasm/src/render/svg/tests.rs

@@ -1,6 +1,6 @@
 use super::fixtures::*;
 
-use crate::shapes::{BlendMode, Fill, SolidColor, StrokeCap, StrokeKind};
+use crate::shapes::{BlendMode, Fill, ImageFill, SolidColor, StrokeCap, StrokeKind};
 use crate::state::ShapesPool;
 use crate::uuid::Uuid;
 
@@ -962,3 +962,229 @@ fn exports_solid_text_with_font_face() {
     );
     insta::assert_snapshot!(svg);
 }
+
+#[test]
+fn exports_image_fill_on_text() {
+    let mut pool = ShapesPool::new();
+    let id = uid(1);
+    let image_id = uid(42);
+    add_image_text(
+        &mut pool,
+        id,
+        (0.0, 0.0, 560.0, 240.0),
+        "HOLA",
+        200.0,
+        image_id,
+    );
+
+    let svg = render_with(&pool, id, |resources| {
+        resources
+            .images
+            .set_source_url(image_id, TEST_IMAGE_URL.to_string());
+    });
+
+    assert!(
+        svg.contains("<image") && svg.contains(TEST_IMAGE_URL),
+        "text image fill must emit a linked <image>: {svg}"
+    );
+    assert!(
+        svg.contains("clip-path=\"url(#"),
+        "text image fill must be clipped to glyph silhouette: {svg}"
+    );
+    assert!(
+        svg.contains("<clipPath ") && svg.contains("<text"),
+        "clipPath must contain text glyphs: {svg}"
+    );
+    assert!(
+        !svg.contains("data:image"),
+        "must not base64-embed the image: {svg}"
+    );
+    insta::assert_snapshot!(svg);
+}
+
+#[test]
+fn exports_image_fill_as_linked_image() {
+    let mut pool = ShapesPool::new();
+    let id = uid(1);
+    let image_id = uid(42);
+    add_image_rect(
+        &mut pool,
+        id,
+        Uuid::nil(),
+        (0.0, 0.0, 100.0, 80.0),
+        image_id,
+        true,
+        255,
+    );
+
+    let svg = render_with(&pool, id, |resources| {
+        resources
+            .images
+            .set_source_url(image_id, TEST_IMAGE_URL.to_string());
+    });
+
+    assert!(
+        svg.contains("<image"),
+        "image fill must emit an <image> element: {svg}"
+    );
+    assert!(
+        svg.contains(TEST_IMAGE_URL),
+        "image href must use the registered URL: {svg}"
+    );
+    assert!(
+        svg.contains("preserveAspectRatio=\"xMidYMid slice\""),
+        "keep-aspect image fill must slice: {svg}"
+    );
+    assert!(
+        svg.contains("clip-path=\"url(#"),
+        "image fill must be clipped to shape geometry: {svg}"
+    );
+    assert!(
+        !svg.contains("data:image"),
+        "must not base64-embed the image: {svg}"
+    );
+    insta::assert_snapshot!(svg);
+}
+
+#[test]
+fn exports_mixed_solid_and_image_fills_in_order() {
+    // Image under a translucent solid; stretch (keep-aspect off); partial image
+    // opacity; shape not at the page origin (page translate in CTM).
+    let mut pool = ShapesPool::new();
+    let id = uid(1);
+    let image_id = uid(42);
+    add_rect_with_fills(
+        &mut pool,
+        id,
+        Uuid::nil(),
+        (100.0, 50.0, 508.0, 178.0),
+        vec![
+            // fills[0] topmost — solid blue @ 50%
+            Fill::Solid(SolidColor(skia::Color::from_argb(128, 0, 63, 255))),
+            // fills[1] underneath — linked image, stretch, ~50% opacity
+            Fill::Image(ImageFill::new(image_id, 128, 400, 300, false)),
+        ],
+    );
+
+    let svg = render_with(&pool, id, |resources| {
+        resources
+            .images
+            .set_source_url(image_id, TEST_IMAGE_URL.to_string());
+    });
+
+    let image_pos = svg.find("<image");
+    let blue_pos = svg.to_ascii_lowercase().find("fill=\"#003fff\"");
+    assert!(image_pos.is_some(), "missing image fill: {svg}");
+    assert!(blue_pos.is_some(), "missing top solid fill: {svg}");
+    assert!(
+        image_pos.unwrap() < blue_pos.unwrap(),
+        "image (bottom) must appear before solid (top): {svg}"
+    );
+    assert!(
+        svg.contains("preserveAspectRatio=\"none\""),
+        "mixed image fill should stretch when keep-aspect is off: {svg}"
+    );
+    // 128/255 → ~0.50196 as f32 (not a rounded "0.5").
+    assert!(
+        svg.contains("opacity=\"0.5019608\""),
+        "image fill opacity must be emitted: {svg}"
+    );
+    insta::assert_snapshot!(svg);
+}
+
+#[test]
+fn exports_image_fill_on_closed_path() {
+    let mut pool = ShapesPool::new();
+    let id = uid(1);
+    let image_id = uid(42);
+    add_image_path(&mut pool, id, Uuid::nil(), true, image_id);
+
+    let svg = render_with(&pool, id, |resources| {
+        resources
+            .images
+            .set_source_url(image_id, TEST_IMAGE_URL.to_string());
+    });
+
+    assert!(
+        svg.contains("<image") && svg.contains(TEST_IMAGE_URL),
+        "closed path must emit a linked image fill: {svg}"
+    );
+    assert!(
+        svg.contains("clip-path=\"url(#"),
+        "image fill must be clipped to the path: {svg}"
+    );
+    // Clip geometry should be a path (triangle), not a plain rect.
+    assert!(
+        svg.contains("<path") || svg.contains(" d=\""),
+        "closed-path clip must use path geometry: {svg}"
+    );
+    assert!(
+        svg.contains("preserveAspectRatio=\"xMidYMid slice\""),
+        "keep-aspect image fill on path: {svg}"
+    );
+    insta::assert_snapshot!(svg);
+}
+
+#[test]
+fn exports_image_fill_on_open_path() {
+    let mut pool = ShapesPool::new();
+    let id = uid(1);
+    let image_id = uid(42);
+    add_image_path(&mut pool, id, Uuid::nil(), false, image_id);
+
+    let svg = render_with(&pool, id, |resources| {
+        resources
+            .images
+            .set_source_url(image_id, TEST_IMAGE_URL.to_string());
+    });
+
+    assert!(
+        svg.contains("<image") && svg.contains(TEST_IMAGE_URL),
+        "open path must still emit a linked image fill: {svg}"
+    );
+    assert!(
+        svg.contains("clip-path=\"url(#"),
+        "image fill must be clipped to the open path geometry: {svg}"
+    );
+    insta::assert_snapshot!(svg);
+}
+
+#[test]
+fn exports_image_fill_on_frame() {
+    let mut pool = ShapesPool::new();
+    let id = uid(1);
+    let image_id = uid(42);
+    add_image_frame(
+        &mut pool,
+        id,
+        Uuid::nil(),
+        (0.0, 0.0, 200.0, 120.0),
+        image_id,
+        false,
+    );
+
+    let svg = render_with(&pool, id, |resources| {
+        resources
+            .images
+            .set_source_url(image_id, TEST_IMAGE_URL.to_string());
+    });
+
+    assert!(
+        svg.contains("<image") && svg.contains(TEST_IMAGE_URL),
+        "frame background must emit a linked image fill: {svg}"
+    );
+    assert!(
+        svg.contains("clip-path=\"url(#"),
+        "frame image fill must be clipped to the frame: {svg}"
+    );
+    assert!(
+        svg.contains("preserveAspectRatio=\"xMidYMid slice\""),
+        "frame image fill should keep aspect: {svg}"
+    );
+    // No nested board clip when clip_content is off.
+    assert!(
+        !svg.contains("id=\"clip0\""),
+        "unclipped frame should not wrap children in a board clip: {svg}"
+    );
+    insta::assert_snapshot!(svg);
+}

render-wasm/src/render/svg/text.rs

@@ -1,19 +1,122 @@
+use std::collections::HashSet;
+
 use crate::error::Result;
-use crate::shapes::Shape;
+use crate::render::text;
+use crate::shapes::{Fill, ImageFill, Shape};
+use crate::uuid::Uuid;
 
 use super::document::SvgLayerCanvas;
-use crate::render::text;
+use super::images::{emit_linked_image_element, xml_escape_attr};
+use crate::render::RenderResources;
 
-/// Emits a text shape's fill as native `<text>` elements.
+/// Emits a text shape's fills for SVG export.
 ///
-/// The shared GPU/PDF renderer wraps text in `save_layer`, which `SkSVGDevice`
+/// Linked image fills become `<image href>` clipped to the glyph silhouette;
-/// silently drops. Text strokes are handled separately in a later PR.
+/// other fills go through Skia as native `<text>`. Strokes are a later PR.
-pub(super) fn render_text_fill(builder: &mut SvgLayerCanvas, element: &Shape) -> Result<()> {
+pub(super) fn render_text_fill(
+    builder: &mut SvgLayerCanvas,
+    shared: &RenderResources,
+    element: &Shape,
+) -> Result<()> {
+    let text_content = element.get_text_content();
+    let text_content = text_content.new_bounds(element.selrect());
+    let max_layers = text_content.max_fill_layers();
+    if max_layers == 0 {
+        return Ok(());
+    }
+
     let matrix = element.centered_transform();
-    let canvas = builder.canvas();
+
-    canvas.save();
+    for layer in 0..max_layers {
-    canvas.concat(&matrix);
+        let linked = linked_image_fills_at_layer(&text_content, layer, shared);
-    text::paint_text_fill(canvas, element);
+        let skip_ids: HashSet<Uuid> = linked.iter().map(|img| img.id()).collect();
-    canvas.restore();
+
+        for image_fill in &linked {
+            emit_text_image_fill(builder, shared, element, image_fill, layer)?;
+        }
+
+        if layer_has_skia_fills(&text_content, layer, &skip_ids) {
+            let mut paragraph_builders = if skip_ids.is_empty() {
+                text_content.paragraph_builder_group_for_fill_layer(layer)
+            } else {
+                text_content
+                    .paragraph_builder_group_for_fill_layer_skipping_images(layer, &skip_ids)
+            };
+            let canvas = builder.canvas();
+            canvas.save();
+            canvas.concat(&matrix);
+            text::paint_text_paragraphs(canvas, element, &mut paragraph_builders);
+            canvas.restore();
+        }
+    }
+
+    Ok(())
+}
+
+fn linked_image_fills_at_layer<'a>(
+    text_content: &'a crate::shapes::TextContent,
+    layer: usize,
+    shared: &RenderResources,
+) -> Vec<&'a ImageFill> {
+    let mut out = Vec::new();
+    let mut seen = HashSet::new();
+    for paragraph in text_content.paragraphs() {
+        for span in paragraph.children() {
+            if let Some(Fill::Image(img)) = span.fills_from_bottom(layer) {
+                if shared.images.source_url(&img.id()).is_some() && seen.insert(img.id()) {
+                    out.push(img);
+                }
+            }
+        }
+    }
+    out
+}
+
+fn layer_has_skia_fills(
+    text_content: &crate::shapes::TextContent,
+    layer: usize,
+    skip_ids: &HashSet<Uuid>,
+) -> bool {
+    text_content.paragraphs().iter().any(|paragraph| {
+        paragraph
+            .children()
+            .iter()
+            .any(|span| match span.fills_from_bottom(layer) {
+                Some(Fill::Image(img)) if skip_ids.contains(&img.id()) => false,
+                Some(_) => true,
+                None => false,
+            })
+    })
+}
+
+/// Linked `<image>` clipped to the opaque glyph silhouette for this image layer.
+fn emit_text_image_fill(
+    builder: &mut SvgLayerCanvas,
+    shared: &RenderResources,
+    shape: &Shape,
+    image_fill: &ImageFill,
+    layer: usize,
+) -> Result<()> {
+    let Some(url) = shared.images.source_url(&image_fill.id()) else {
+        return Ok(());
+    };
+
+    let clip_id = builder.unique("txtimgclip");
+    let text_content = shape.get_text_content().new_bounds(shape.selrect());
+    let mut paragraph_builders =
+        text_content.paragraph_builder_group_opaque_for_image_layer(layer, image_fill.id());
+
+    let canvas = builder.new_fragment();
+    {
+        let cv: &skia_safe::Canvas = &canvas;
+        cv.save();
+        cv.concat(&shape.centered_transform());
+        text::paint_text_paragraphs(cv, shape, &mut paragraph_builders);
+        cv.restore();
+    }
+    builder.finish_clip_path_fragment(&clip_id, canvas);
+
+    let href = xml_escape_attr(url);
+    emit_linked_image_element(builder, shape, image_fill, &href, &clip_id);
     Ok(())
 }

render-wasm/src/render/text.rs

@@ -530,22 +530,13 @@ fn render_text_on_canvas(
     }
 }
 
-/// Paints text fill for vector SVG export. Skips `save_layer` wrappers that
+/// Paints pre-built paragraph groups (SVG export path for selective fill layers).
-/// `SkSVGDevice` would drop.
+pub fn paint_text_paragraphs(
-pub fn paint_text_fill(canvas: &Canvas, shape: &Shape) {
+    canvas: &Canvas,
-    let text_content = shape.get_text_content();
+    shape: &Shape,
-    let text_content = text_content.new_bounds(shape.selrect());
+    paragraph_builder_groups: &mut [Vec<ParagraphBuilder>],
-    let max_layers = text_content.max_fill_layers();
+) {
-    if max_layers == 0 {
+    paint_text_with_emoji_overlay(canvas, shape, paragraph_builder_groups, false);
-        return;
-    }
-
-    // Each fill layer is painted separately so SkSVGDevice can emit `fill`
-    // attributes (merged shaders are dropped). Bottom layer first.
-    for layer in 0..max_layers {
-        let mut paragraph_builders = text_content.paragraph_builder_group_for_fill_layer(layer);
-        paint_text_with_emoji_overlay(canvas, shape, &mut paragraph_builders, false);
-    }
 }
 
 /// Lays out and paints paragraph builders without any layer management.

render-wasm/src/shapes/text.rs

@@ -796,13 +796,13 @@ impl TextContent {
         &self,
         use_shadow: Option<bool>,
     ) -> Vec<ParagraphBuilderGroup> {
-        self.paragraph_builders(use_shadow, false, None, None)
+        self.paragraph_builders(use_shadow, false, None, None, None, None)
     }
 
     /// Creates paragraph builders with always-opaque paint (BLACK @ alpha 255).
     /// Used as a clip mask for inner stroke rendering.
     pub fn paragraph_builder_group_opaque(&self) -> Vec<ParagraphBuilderGroup> {
-        self.paragraph_builders(None, true, None, None)
+        self.paragraph_builders(None, true, None, None, None, None)
     }
 
     /// Maximum number of stacked fills across every span in this text block.
@@ -821,7 +821,42 @@ impl TextContent {
         &self,
         layer_from_bottom: usize,
     ) -> Vec<ParagraphBuilderGroup> {
-        self.paragraph_builders(None, false, None, Some(layer_from_bottom))
+        self.paragraph_builders(None, false, None, Some(layer_from_bottom), None, None)
+    }
+
+    /// Like [`paragraph_builder_group_for_fill_layer`], but spans whose fill at
+    /// this layer is an image in `skip_image_ids` get transparent paint (those
+    /// fills are re-emitted as linked SVG `<image>` elements).
+    pub fn paragraph_builder_group_for_fill_layer_skipping_images(
+        &self,
+        layer_from_bottom: usize,
+        skip_image_ids: &HashSet<Uuid>,
+    ) -> Vec<ParagraphBuilderGroup> {
+        self.paragraph_builders(
+            None,
+            false,
+            None,
+            Some(layer_from_bottom),
+            None,
+            Some(skip_image_ids),
+        )
+    }
+
+    /// Opaque black glyphs only for spans whose fill at `layer_from_bottom` is
+    /// the given image — used as an SVG `<clipPath>` for linked image fills.
+    pub fn paragraph_builder_group_opaque_for_image_layer(
+        &self,
+        layer_from_bottom: usize,
+        image_id: Uuid,
+    ) -> Vec<ParagraphBuilderGroup> {
+        self.paragraph_builders(
+            None,
+            false,
+            None,
+            None,
+            Some((layer_from_bottom, image_id)),
+            None,
+        )
     }
 
     fn paragraph_builders(
@@ -830,6 +865,8 @@ impl TextContent {
         opaque: bool,
         align_override: Option<skia::textlayout::TextAlign>,
         fill_layer: Option<usize>,
+        opaque_image_layer: Option<(usize, Uuid)>,
+        skip_image_ids: Option<&HashSet<Uuid>>,
     ) -> Vec<ParagraphBuilderGroup> {
         let fonts = get_font_collection();
         let fallback_fonts = get_fallback_fonts();
@@ -843,15 +880,63 @@ impl TextContent {
             let mut builder = ParagraphBuilder::new(&paragraph_style, fonts);
             let mut has_text = false;
             for span in paragraph.children() {
-                let remove_alpha =
+                let text_style = if let Some((layer, image_id)) = opaque_image_layer {
-                    opaque || (use_shadow.unwrap_or(false) && !span.is_transparent());
+                    let mut style = span.to_style(
-                let text_style = span.to_style_with_paint(
+                        &self.bounds(),
-                    &self.bounds(),
+                        fallback_fonts,
-                    fallback_fonts,
+                        false,
-                    remove_alpha,
+                        paragraph.line_height(),
-                    paragraph.line_height(),
+                    );
-                    fill_layer,
+                    let mut paint = paint::Paint::default();
-                );
+                    match span.fills_from_bottom(layer) {
+                        Some(shapes::Fill::Image(img)) if img.id() == image_id => {
+                            paint.set_color(skia::Color::BLACK);
+                            paint.set_alpha(255);
+                        }
+                        _ => {
+                            paint.set_color(skia::Color::TRANSPARENT);
+                        }
+                    }
+                    style.set_foreground_paint(&paint);
+                    style
+                } else if let (Some(layer), Some(skip)) = (fill_layer, skip_image_ids) {
+                    let skip_span = matches!(
+                        span.fills_from_bottom(layer),
+                        Some(shapes::Fill::Image(img)) if skip.contains(&img.id())
+                    );
+                    if skip_span {
+                        let mut style = span.to_style(
+                            &self.bounds(),
+                            fallback_fonts,
+                            false,
+                            paragraph.line_height(),
+                        );
+                        let mut paint = paint::Paint::default();
+                        paint.set_color(skia::Color::TRANSPARENT);
+                        style.set_foreground_paint(&paint);
+                        style
+                    } else {
+                        let remove_alpha =
+                            opaque || (use_shadow.unwrap_or(false) && !span.is_transparent());
+                        span.to_style_with_paint(
+                            &self.bounds(),
+                            fallback_fonts,
+                            remove_alpha,
+                            paragraph.line_height(),
+                            fill_layer,
+                        )
+                    }
+                } else {
+                    let remove_alpha =
+                        opaque || (use_shadow.unwrap_or(false) && !span.is_transparent());
+                    span.to_style_with_paint(
+                        &self.bounds(),
+                        fallback_fonts,
+                        remove_alpha,
+                        paragraph.line_height(),
+                        fill_layer,
+                    )
+                };
                 let text: String = span.apply_text_transform();
                 if !text.is_empty() {
                     has_text = true;
@@ -871,8 +956,14 @@ impl TextContent {
     /// Performs an Auto Width text layout.
     fn text_layout_auto_width(&self) -> TextContentLayoutResult {
         // Left-aligned MAX-width pass: longest_line() is glyph width, not the huge container.
-        let mut measure_builders =
+        let mut measure_builders = self.paragraph_builders(
-            self.paragraph_builders(None, false, Some(skia::textlayout::TextAlign::Left), None);
+            None,
+            false,
+            Some(skia::textlayout::TextAlign::Left),
+            None,
+            None,
+            None,
+        );
 
         let normalized_line_height =
             calculate_normalized_line_height(&mut measure_builders, f32::MAX);
@@ -1464,6 +1555,15 @@ pub struct TextSpan {
 }
 
 impl TextSpan {
+    /// Fill at `layer` counting from the bottom (`0` = last / bottommost fill).
+    pub fn fills_from_bottom(&self, layer: usize) -> Option<&shapes::Fill> {
+        if layer < self.fills.len() {
+            Some(&self.fills[self.fills.len() - 1 - layer])
+        } else {
+            None
+        }
+    }
+
     #[allow(clippy::too_many_arguments)]
     pub fn new(
         text: String,

render-wasm/src/wasm/fills/image.rs

@@ -140,6 +140,22 @@ pub extern "C" fn store_image() -> Result<()> {
     Ok(())
 }
 
+/// Registers the public URL an image was loaded from for SVG export.
+///
+/// Layout: UTF-8 URL bytes in the alloc buffer. The image UUID is passed as
+/// the four u32 arguments (same quartet as `store_image` / `is_image_cached`).
+#[no_mangle]
+#[wasm_error]
+pub extern "C" fn store_image_url(a: u32, b: u32, c: u32, d: u32) -> Result<()> {
+    let id = uuid_from_u32_quartet(a, b, c, d);
+    let url_bytes = mem::bytes();
+    let url = String::from_utf8(url_bytes)
+        .map_err(|_| Error::CriticalError("Invalid UTF-8 in image source URL".to_string()))?;
+    mem::free_bytes()?;
+    get_resources().images.set_source_url(id, url);
+    Ok(())
+}
+
 /// Stores an image from an existing WebGL texture, avoiding re-decoding
 /// Expected memory layout:
 /// - bytes 0-15: shape UUID