70 lines
2.2 KiB
Dart
70 lines
2.2 KiB
Dart
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// lib/editor/render/static_ink_painter.dart
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//
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// CustomPainter for the committed-stroke (static) layer.
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//
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// paint() gets-or-builds a ui.Picture of all committed strokes keyed by
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// store.revision, then delegates to canvas.drawPicture — so as long as the
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// revision is unchanged the raster thread replays the same display list at
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// zero CPU cost.
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//
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// shouldRepaint() is O(1): it compares the revision int and pageSize only.
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import 'dart:ui' as ui;
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import 'package:flutter/material.dart';
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import '../engine/stroke_geometry.dart';
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import '../engine/stroke_store.dart';
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import 'ink_picture_cache.dart';
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/// Paints the committed ink layer by recording strokes into a [ui.Picture]
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/// once per [StrokeStore.revision] and caching it in [InkPictureCache].
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///
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/// Place this inside a [RepaintBoundary] / [CustomPaint] pair. The sibling
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/// [LiveInkPainter] handles the in-progress stroke in a separate layer.
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class StaticInkPainter extends CustomPainter {
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StaticInkPainter({
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required this.hostId,
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required this.store,
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required this.pageSize,
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required this.cache,
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}) : revision = store.revision;
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final String hostId;
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final StrokeStore store;
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final Size pageSize;
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final InkPictureCache cache;
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/// Revision snapshot captured at construction time. Used by [shouldRepaint]
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/// so two painters built at different revisions compare correctly even when
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/// they share the same [StrokeStore] instance.
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final int revision;
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@override
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void paint(Canvas canvas, Size size) {
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final picture = cache.getOrBuild(hostId, store.revision, pageSize, () {
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final recorder = ui.PictureRecorder();
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final rec = Canvas(recorder);
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for (final stroke in store.committed) {
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final path =
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buildStrokeOutline(stroke, pageSize, isComplete: true);
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if (path.getBounds().isEmpty) continue;
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rec.drawPath(
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path,
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Paint()
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..color = Color(stroke.color)
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..style = PaintingStyle.fill
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..isAntiAlias = true,
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);
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}
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return recorder.endRecording();
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});
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canvas.drawPicture(picture);
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}
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@override
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bool shouldRepaint(StaticInkPainter old) =>
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old.revision != store.revision || old.pageSize != pageSize;
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}
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