20 lines
575 B
Markdown
20 lines
575 B
Markdown
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---
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id: png-pre-warm
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title: PNG 缓存预热（推荐）
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---
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# 🔥 PNG 缓存预热（推荐）
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在挂载 Canvas 前预热 PNG 解码缓存，可节省 **100–250ms** 的初始化时间。
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```tsx
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import { prewarmPngBgrCacheAsync } from 'react-native-mask-segment-canvas';
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async function openPaintScreen(originUrl: string, maskUrl: string) {
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await prewarmPngBgrCacheAsync([originUrl, maskUrl]);
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navigation.navigate('Paint', { originUrl, maskUrl });
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}
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```
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在下载/提取图片后、导航到上色界面前调用 `prewarmPngBgrCacheAsync` 可获得最佳性能。
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