Prepare fast document-space captures

crates/obscura-js/src/lib.rs

@@ -12,4 +12,7 @@ pub use v8_flags::set_v8_flags;
 // Screenshot rasterization (PNG bytes) from the render layer. Available when the
 // render feature (which enables obscura-render/paint) is compiled in.
 #[cfg(feature = "render")]
-pub use obscura_render::{screenshot_png, screenshot_png_scrolled};
+pub use obscura_render::{
+    screenshot_png, screenshot_png_scrolled, CaptureError, CaptureRegion,
+    MAX_CAPTURE_DIMENSION, MAX_CAPTURE_PIXELS,
+};