planning

node_modules/geotiff/dist-node/compression/webimage.js

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+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const basedecoder_js_1 = __importDefault(require("./basedecoder.js"));
+/**
+ * class WebImageDecoder
+ *
+ * This decoder uses the browsers image decoding facilities to read image
+ * formats like WebP when supported.
+ */
+class WebImageDecoder extends basedecoder_js_1.default {
+    constructor() {
+        super();
+        if (typeof createImageBitmap === 'undefined') {
+            throw new Error('Cannot decode WebImage as `createImageBitmap` is not available');
+        }
+        else if (typeof document === 'undefined' && typeof OffscreenCanvas === 'undefined') {
+            throw new Error('Cannot decode WebImage as neither `document` nor `OffscreenCanvas` is not available');
+        }
+    }
+    async decode(fileDirectory, buffer) {
+        const blob = new Blob([buffer]);
+        const imageBitmap = await createImageBitmap(blob);
+        let canvas;
+        if (typeof document !== 'undefined') {
+            canvas = document.createElement('canvas');
+            canvas.width = imageBitmap.width;
+            canvas.height = imageBitmap.height;
+        }
+        else {
+            canvas = new OffscreenCanvas(imageBitmap.width, imageBitmap.height);
+        }
+        const ctx = canvas.getContext('2d');
+        ctx.drawImage(imageBitmap, 0, 0);
+        // TODO: check how many samples per pixel we have, and return RGB/RGBA accordingly
+        // it seems like GDAL always encodes via RGBA which does not require a translation
+        return ctx.getImageData(0, 0, imageBitmap.width, imageBitmap.height).data.buffer;
+    }
+}
+exports.default = WebImageDecoder;
+//# sourceMappingURL=webimage.js.map