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🐛 Fix clamp backbuffer crop origin for partially off-screen shapes

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This commit is contained in:
Alejandro Alonso 2026-05-13 12:46:07 +02:00
parent fffafdab93
commit 9c61aa4f17
1 changed files with 12 additions and 2 deletions
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14
render-wasm/src/render.rs
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@ -1721,6 +1721,16 @@ impl RenderState {
&& doc_bounds.top >= viewport.top
&& doc_bounds.right <= viewport.right
&& doc_bounds.bottom <= viewport.bottom;
// When the shape extends beyond the viewport to the left or top,
// `left`/`top` are negative. Skia clamps `makeImageSnapshot` to the
// surface bounds, so the returned image actually starts at pixel 0 —
// not at the negative coordinate. Store the clamped value so that
// `doc_left`/`doc_top` computed during the drag reflects the true
// image origin in the backbuffer.
let capture_src_left = left.max(0);
let capture_src_top = top.max(0);
self.backbuffer_crop_cache.insert(
id,
InteractiveDragCrop {
@ -1729,8 +1739,8 @@ impl RenderState {
fits_viewport_at_capture,
capture_vb_left: vb_left,
capture_vb_top: vb_top,
capture_src_left: src_irect.left,
capture_src_top: src_irect.top,
capture_src_left,
capture_src_top,
image,
},
);