51 lines
1.9 KiB
JavaScript
51 lines
1.9 KiB
JavaScript
import { Platform } from 'react-native';
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import RNFS from 'react-native-fs';
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import { ensurePngFile, isPngPath, normalizePath, toPngFileName } from './pngImage';
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function hashUrl(url) {
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let hash = 0;
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for (let i = 0; i < url.length; i++) {
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hash = (hash * 31 + url.charCodeAt(i)) | 0;
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}
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return Math.abs(hash).toString(36);
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}
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/** 将本地路径或远程 URL 解析为 OpenCV / RNFS 可读的 PNG 本地路径 */
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export async function resolveImageUrl(source, cacheFileName) {
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const trimmed = source.trim();
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if (!trimmed) {
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throw new Error('Image URL is empty');
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}
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const pngCacheName = toPngFileName(cacheFileName ?? `img_${hashUrl(trimmed)}.png`);
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if (trimmed.startsWith('http://') || trimmed.startsWith('https://')) {
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const tmpDest = `${RNFS.CachesDirectoryPath}/tmp_${Date.now()}_${pngCacheName}`;
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const { statusCode } = await RNFS.downloadFile({
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fromUrl: trimmed,
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toFile: tmpDest,
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}).promise;
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if (statusCode !== 200) {
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throw new Error(`Download image failed: ${trimmed}`);
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}
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try {
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return await ensurePngFile(tmpDest, pngCacheName);
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}
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finally {
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if (await RNFS.exists(tmpDest)) {
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await RNFS.unlink(tmpDest);
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}
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}
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}
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const normalized = normalizePath(trimmed);
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if (await RNFS.exists(normalized) && isPngPath(normalized)) {
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return normalized;
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}
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if (normalized.startsWith('file://')) {
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return ensurePngFile(normalized, pngCacheName);
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}
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if (Platform.OS === 'ios' && normalized.startsWith('/')) {
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return ensurePngFile(normalized, pngCacheName);
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}
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if (await RNFS.exists(normalized)) {
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return ensurePngFile(normalized, pngCacheName);
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}
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return ensurePngFile(trimmed, pngCacheName);
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}
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//# sourceMappingURL=resolveImageUrl.js.map
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