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node_modules/pdf-lib/cjs/utils/png.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.PNG = exports.PngType = void 0;
+var tslib_1 = require("tslib");
+var upng_1 = tslib_1.__importDefault(require("@pdf-lib/upng"));
+var getImageType = function (ctype) {
+    if (ctype === 0)
+        return PngType.Greyscale;
+    if (ctype === 2)
+        return PngType.Truecolour;
+    if (ctype === 3)
+        return PngType.IndexedColour;
+    if (ctype === 4)
+        return PngType.GreyscaleWithAlpha;
+    if (ctype === 6)
+        return PngType.TruecolourWithAlpha;
+    throw new Error("Unknown color type: " + ctype);
+};
+var splitAlphaChannel = function (rgbaChannel) {
+    var pixelCount = Math.floor(rgbaChannel.length / 4);
+    var rgbChannel = new Uint8Array(pixelCount * 3);
+    var alphaChannel = new Uint8Array(pixelCount * 1);
+    var rgbaOffset = 0;
+    var rgbOffset = 0;
+    var alphaOffset = 0;
+    while (rgbaOffset < rgbaChannel.length) {
+        rgbChannel[rgbOffset++] = rgbaChannel[rgbaOffset++];
+        rgbChannel[rgbOffset++] = rgbaChannel[rgbaOffset++];
+        rgbChannel[rgbOffset++] = rgbaChannel[rgbaOffset++];
+        alphaChannel[alphaOffset++] = rgbaChannel[rgbaOffset++];
+    }
+    return { rgbChannel: rgbChannel, alphaChannel: alphaChannel };
+};
+var PngType;
+(function (PngType) {
+    PngType["Greyscale"] = "Greyscale";
+    PngType["Truecolour"] = "Truecolour";
+    PngType["IndexedColour"] = "IndexedColour";
+    PngType["GreyscaleWithAlpha"] = "GreyscaleWithAlpha";
+    PngType["TruecolourWithAlpha"] = "TruecolourWithAlpha";
+})(PngType = exports.PngType || (exports.PngType = {}));
+var PNG = /** @class */ (function () {
+    function PNG(pngData) {
+        var upng = upng_1.default.decode(pngData);
+        var frames = upng_1.default.toRGBA8(upng);
+        if (frames.length > 1)
+            throw new Error("Animated PNGs are not supported");
+        var frame = new Uint8Array(frames[0]);
+        var _a = splitAlphaChannel(frame), rgbChannel = _a.rgbChannel, alphaChannel = _a.alphaChannel;
+        this.rgbChannel = rgbChannel;
+        var hasAlphaValues = alphaChannel.some(function (a) { return a < 255; });
+        if (hasAlphaValues)
+            this.alphaChannel = alphaChannel;
+        this.type = getImageType(upng.ctype);
+        this.width = upng.width;
+        this.height = upng.height;
+        this.bitsPerComponent = 8;
+    }
+    PNG.load = function (pngData) { return new PNG(pngData); };
+    return PNG;
+}());
+exports.PNG = PNG;
+//# sourceMappingURL=png.js.map