vello_cpu: Make RenderContext resizable

sparse_strips/vello_bench/src/data.rs

@@ -132,7 +132,7 @@ impl DataItem {
 
     /// Get the unsorted tiles.
     pub fn unsorted_tiles(&self) -> Tiles {
-        let mut tiles = Tiles::new(Level::new(), self.height);
+        let mut tiles = Tiles::new(Level::new(), self.width, self.height);
         let lines = self.lines();
         tiles.make_tiles_analytic_aa(Level::new(), &lines, self.width, self.height);
 

sparse_strips/vello_bench/src/strip.rs

@@ -87,7 +87,7 @@ pub fn render_strips_cull(c: &mut Criterion) {
 
         let shifted_lines = shift_lines_50_percent(&item.lines());
 
-        let mut tiler = Tiles::new(simd_level, item.height);
+        let mut tiler = Tiles::new(simd_level, item.width, item.height);
         tiler.make_tiles_analytic_aa(simd_level, &shifted_lines, item.width, item.height);
         tiler.sort_tiles();
 
@@ -139,7 +139,7 @@ pub fn render_rect(c: &mut Criterion) {
                 &mut storage,
                 None,
             );
-            generator.reset();
+            generator.reset(width, height);
             std::hint::black_box(&storage);
         });
     });
@@ -152,7 +152,7 @@ pub fn render_rect(c: &mut Criterion) {
         b.iter(|| {
             storage.clear();
             generator.generate_filled_rect_fast(&rect, &mut storage, None);
-            generator.reset();
+            generator.reset(width, height);
             std::hint::black_box(&storage);
         });
     });

sparse_strips/vello_bench/src/tile.rs

@@ -24,7 +24,7 @@ where
 
         g.bench_with_input(BenchmarkId::from_parameter(&item.name), &item, |b, item| {
             b.iter(|| {
-                let mut tiler = Tiles::new(Level::new(), item.height);
+                let mut tiler = Tiles::new(Level::new(), item.width, item.height);
                 op(&mut tiler, &lines, item.width, item.height);
             });
         });

sparse_strips/vello_common/src/strip_generator.rs

@@ -95,7 +95,7 @@ impl StripGenerator {
         Self {
             level,
             line_buf: Vec::new(),
-            tiles: Tiles::new(level, height),
+            tiles: Tiles::new(level, width, height),
             flatten_ctx: FlattenCtx::default(),
             stroke_ctx: StrokeCtx::default(),
             temp_storage: StripStorage::default(),
@@ -238,10 +238,12 @@ impl StripGenerator {
         );
     }
 
-    /// Reset the strip generator.
-    pub fn reset(&mut self) {
+    /// Reset the strip generator for a viewport size, resizing only when needed.
+    pub fn reset(&mut self, width: u16, height: u16) {
+        self.width = width;
+        self.height = height;
         self.line_buf.clear();
-        self.tiles.reset();
+        self.tiles.reset(width, height);
         self.temp_storage.clear();
     }
 }
@@ -307,7 +309,7 @@ mod tests {
         assert!(!generator.line_buf.is_empty());
         assert!(!storage.is_empty());
 
-        generator.reset();
+        generator.reset(100, 100);
         storage.clear();
 
         assert!(generator.line_buf.is_empty());
@@ -329,7 +331,7 @@ mod tests {
             &mut storage_path,
             None,
         );
-        generator.reset();
+        generator.reset(100, 100);
 
         generator.generate_filled_rect_fast(&rect, &mut storage_rect, None);