KiteRenderSpec

Vector-render each page into a bitmap for its size and its settled zoom, then draw that bitmap and GPU-transform it during gestures, so scrolling and zoom never redraw the page itself. Heavy gesturing is cheap and content-independent; the costs are one rasterization per page size and per settled zoom, and softness when zoomed past the raster resolution until the zoom settles and it re-rasterizes. Best for slow devices and dense pages.

Draw each page into a live Canvas, transformed by zoom/pan via the same GPU layer: no bitmap (lower memory). Vector content stays sharp at rest on every platform. The page draws again when its size, the theme or this spec changes. A change to the overlay, such as a search hit or a highlight, and each frame of a pinch replay the drawing that the page recorded. Once a zoom settles, the page draws again at it, so images keep the detail the zoom shows and a hairline stays about one screen pixel wide (#418). On Android the vector display list replays under the live transform, so it stays crisp even mid-pinch; on Skia targets (iOS/desktop/web) the layer is texture-cached, so deep in-gesture zoom softens until the draw re-runs. Per-page draw cost scales with content complexity. Best for simple pages, deep-zoom crispness, and low memory.