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pewdiepie-archdaemonandClaude Opus 5.5
5fac693c1c
Photoshop-parity editor client: layers, selection/masking, brushes,
smart filters, LUT import, Quick Edit, mobile gestures, workspaces,
batch operations, and the service-worker versioning (v978->v1006).
Source: vendor/photocraft (ad1cff44) photo-editor client files, merged
onto upstream/dev (a8c147b2). Conflict resolution documented in
pr_work/A_conflicts.md; editor files taken from vendor/photocraft
(upstream's editor is an earlier snapshot of the same feature).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
32 lines
1.3 KiB
JavaScript
32 lines
1.3 KiB
JavaScript
// Auto-Select hit-testing (Move tool). Walks the layer stack front-to-back
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// and returns the topmost layer whose rendered pixels are opaque at the
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// requested document point. Kept dependency-free so it can run under node
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// for unit tests; the caller injects layer-geometry and pixel sampling.
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export const AUTO_SELECT_ALPHA_THRESHOLD = 8;
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export function pickTopmostLayerAt({
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layers,
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point,
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isHidden = () => false,
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isLocked = () => false,
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getOffset = () => ({ x: 0, y: 0 }),
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sampleAlpha,
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} = {}) {
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if (!Array.isArray(layers) || !point || typeof sampleAlpha !== 'function') return null;
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// Front-to-back: the last layer in the array paints on top.
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for (let index = layers.length - 1; index >= 0; index -= 1) {
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const layer = layers[index];
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if (!layer?.visible || layer.kind === 'adjustment' || !layer.canvas) continue;
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if (isHidden(layer)) continue;
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if (isLocked(layer)) continue;
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const offset = getOffset(layer) || { x: 0, y: 0 };
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const x = Math.floor(point.x - offset.x);
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const y = Math.floor(point.y - offset.y);
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if (x < 0 || y < 0 || x >= layer.canvas.width || y >= layer.canvas.height) continue;
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const alpha = sampleAlpha(layer, x, y);
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if (alpha != null && alpha > AUTO_SELECT_ALPHA_THRESHOLD) return layer;
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}
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return null;
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}
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