fix(render): lay out text nodes in taffy and implement inline flow

crates/obscura-render/src/dom.rs

@@ -140,6 +140,25 @@ fn build(
     styles: &HashMap<NodeId, crate::LayoutStyle>,
 ) -> Option<taffy::NodeId> {
     let node = tree.get_node(id)?;
+
+    if let obscura_dom::tree::NodeData::Text { contents } = &node.data {
+        let text = contents.trim();
+        if text.is_empty() {
+            return None;
+        }
+        let width = text.chars().count() as f32 * 9.0;
+        let style = taffy::Style {
+            size: taffy::Size {
+                width: taffy::Dimension::Length(width),
+                height: taffy::Dimension::Length(19.0),
+            },
+            ..Default::default()
+        };
+        let taffy_id = taffy_tree.new_leaf(style).ok()?;
+        id_map.insert(taffy_id, id);
+        return Some(taffy_id);
+    }
+
     let _name = node.as_element()?;
     let style = styles.get(&id)?;
     let taffy_style = to_taffy_style(style);

crates/obscura-render/src/lib.rs

@@ -49,6 +49,7 @@ pub enum Display {
     #[default]
     Block,
     Flex,
+    Inline,
     #[allow(dead_code)]
     None,
 }
@@ -144,8 +145,13 @@ pub(crate) fn to_taffy_style(style: &LayoutStyle) -> Style {
     s.display = match style.display {
         Display::Block => taffy::style::Display::Block,
         Display::Flex => taffy::style::Display::Flex,
+        Display::Inline => taffy::style::Display::Flex,
         Display::None => taffy::style::Display::None,
     };
+    if style.display == Display::Inline {
+        s.flex_direction = taffy::FlexDirection::Row;
+    }
+    s.flex_wrap = taffy::FlexWrap::Wrap;
     s.size = taffy::Size {
         width: dimension(style.width),
         height: dimension(style.height),

crates/obscura-render/src/paint.rs

@@ -117,17 +117,23 @@ fn paint_text_node(
 ) -> Option<()> {
     let node = tree.get_node(nid)?;
     let text = match &node.data {
-        obscura_dom::tree::NodeData::Text { contents } => contents,
+        obscura_dom::tree::NodeData::Text { contents } => contents.trim(),
         _ => return None,
     };
+    if text.is_empty() {
+        return None;
+    }
     
-    // Find parent element to get geometry and color
     let parent = node.parent?;
-    let rect = laid.rects.get(&parent)?;
     let style = laid.styles.get(&parent)?;
-    // Default color to black if not specified.
     let color = style.color.unwrap_or([0, 0, 0, 255]);
     
+    // Get geometry of the text node itself!
+    let rect = match laid.rects.get(&nid) {
+        Some(r) => r,
+        None => return None,
+    };
+    
     // Paint text at rect.x, rect.y
     draw_text(pixmap, text, rect.x, rect.y, color);
     Some(())

crates/obscura-render/src/style.rs

@@ -23,8 +23,11 @@ pub fn compute_style(tag: &str, inline_css: Option<&str>) -> LayoutStyle {
 /// Built-in UA defaults. Inline elements currently map to block layout; real
 /// inline/text layout arrives with the text/paint phase.
 pub fn ua_style(tag: &str) -> LayoutStyle {
-    let _ = tag;
-    LayoutStyle { display: Display::Block, ..Default::default() }
+    let display = match tag {
+        "span" | "a" | "b" | "i" | "strong" | "em" => Display::Inline,
+        _ => Display::Block,
+    };
+    LayoutStyle { display, ..Default::default() }
 }
 
 pub fn apply_inline(style: &mut LayoutStyle, css: &str) {
@@ -51,6 +54,7 @@ fn apply_value(style: &mut LayoutStyle, name: &str, value: &str) {
         "display" => match value {
             "block" => style.display = Display::Block,
             "flex" => style.display = Display::Flex,
+            "inline" => style.display = Display::Inline,
             "none" => style.display = Display::None,
             _ => {}
         },