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resources/app/node_modules/@pixi/utils/lib/media/getCanvasBoundingBox.js

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+"use strict";
+var BoundingBox = require("./BoundingBox.js");
+function checkRow(data, width, y) {
+  for (let x = 0, index = 4 * y * width; x < width; ++x, index += 4)
+    if (data[index + 3] !== 0)
+      return !1;
+  return !0;
+}
+function checkColumn(data, width, x, top, bottom) {
+  const stride = 4 * width;
+  for (let y = top, index = top * stride + 4 * x; y <= bottom; ++y, index += stride)
+    if (data[index + 3] !== 0)
+      return !1;
+  return !0;
+}
+function getCanvasBoundingBox(canvas) {
+  const { width, height } = canvas, context = canvas.getContext("2d", {
+    willReadFrequently: !0
+  });
+  if (context === null)
+    throw new TypeError("Failed to get canvas 2D context");
+  const data = context.getImageData(0, 0, width, height).data;
+  let left = 0, top = 0, right = width - 1, bottom = height - 1;
+  for (; top < height && checkRow(data, width, top); )
+    ++top;
+  if (top === height)
+    return BoundingBox.BoundingBox.EMPTY;
+  for (; checkRow(data, width, bottom); )
+    --bottom;
+  for (; checkColumn(data, width, left, top, bottom); )
+    ++left;
+  for (; checkColumn(data, width, right, top, bottom); )
+    --right;
+  return ++right, ++bottom, new BoundingBox.BoundingBox(left, top, right, bottom);
+}
+exports.getCanvasBoundingBox = getCanvasBoundingBox;
+//# sourceMappingURL=getCanvasBoundingBox.js.map