Add new bounding-box helpers in Util to reduce code duplication

Currently we have a `Util`-helper for computing the bounding-box of a Bézier curve, however for simple points and rectangles we repeat virtually identical code in many spots throughout the code-base.

 - Introduce new `Util.pointBoundingBox` and `Util.rectBoundingBox` helpers.

 - Remove the "fallback" from `Util.bezierBoundingBox` and only support passing in a `minMax`-array, since there's only a single call-site using the other format and it could be easily updated.

Author: Snuffleupagus

src/core/annotation.js

@@ -4325,10 +4325,13 @@ class PolylineAnnotation extends MarkupAnnotation {
       // we get similar rendering/highlighting behaviour as in Adobe Reader.
       const bbox = [Infinity, Infinity, -Infinity, -Infinity];
       for (let i = 0, ii = vertices.length; i < ii; i += 2) {
-        bbox[0] = Math.min(bbox[0], vertices[i] - borderAdjust);
-        bbox[1] = Math.min(bbox[1], vertices[i + 1] - borderAdjust);
-        bbox[2] = Math.max(bbox[2], vertices[i] + borderAdjust);
-        bbox[3] = Math.max(bbox[3], vertices[i + 1] + borderAdjust);
+        Util.rectBoundingBox(
+          vertices[i] - borderAdjust,
+          vertices[i + 1] - borderAdjust,
+          vertices[i] + borderAdjust,
+          vertices[i + 1] + borderAdjust,
+          bbox
+        );
       }
       if (!Util.intersect(this.rectangle, bbox)) {
         this.rectangle = bbox;
@@ -4422,10 +4425,13 @@ class InkAnnotation extends MarkupAnnotation {
       const bbox = [Infinity, Infinity, -Infinity, -Infinity];
       for (const inkList of this.data.inkLists) {
         for (let i = 0, ii = inkList.length; i < ii; i += 2) {
-          bbox[0] = Math.min(bbox[0], inkList[i] - borderAdjust);
-          bbox[1] = Math.min(bbox[1], inkList[i + 1] - borderAdjust);
-          bbox[2] = Math.max(bbox[2], inkList[i] + borderAdjust);
-          bbox[3] = Math.max(bbox[3], inkList[i + 1] + borderAdjust);
+          Util.rectBoundingBox(
+            inkList[i] - borderAdjust,
+            inkList[i + 1] - borderAdjust,
+            inkList[i] + borderAdjust,
+            inkList[i + 1] + borderAdjust,
+            bbox
+          );
         }
       }
       if (!Util.intersect(this.rectangle, bbox)) {

src/core/evaluator.js

@@ -1421,30 +1421,21 @@ class PartialEvaluator {
             DrawOPS.closePath
           );
         }
-        minMax[0] = Math.min(minMax[0], x, xw);
-        minMax[1] = Math.min(minMax[1], y, yh);
-        minMax[2] = Math.max(minMax[2], x, xw);
-        minMax[3] = Math.max(minMax[3], y, yh);
+        Util.rectBoundingBox(x, y, xw, yh, minMax);
         break;
       }
       case OPS.moveTo: {
         const x = (state.currentPointX = args[0]);
         const y = (state.currentPointY = args[1]);
         pathBuffer.push(DrawOPS.moveTo, x, y);
-        minMax[0] = Math.min(minMax[0], x);
-        minMax[1] = Math.min(minMax[1], y);
-        minMax[2] = Math.max(minMax[2], x);
-        minMax[3] = Math.max(minMax[3], y);
+        Util.pointBoundingBox(x, y, minMax);
         break;
       }
       case OPS.lineTo: {
         const x = (state.currentPointX = args[0]);
         const y = (state.currentPointY = args[1]);
         pathBuffer.push(DrawOPS.lineTo, x, y);
-        minMax[0] = Math.min(minMax[0], x);
-        minMax[1] = Math.min(minMax[1], y);
-        minMax[2] = Math.max(minMax[2], x);
-        minMax[3] = Math.max(minMax[3], y);
+        Util.pointBoundingBox(x, y, minMax);
         break;
       }
       case OPS.curveTo: {
@@ -4812,7 +4803,8 @@ class TranslatedFont {
       // Override the fontBBox when it's undefined/empty, or when it's at least
       // (approximately) one order of magnitude smaller than the charBBox
       // (fixes issue14999_reduced.pdf).
-      this.#computeCharBBox(charBBox);
+      this._bbox ??= [Infinity, Infinity, -Infinity, -Infinity];
+      Util.rectBoundingBox(...charBBox, this._bbox);
     }
 
     let i = 0,
@@ -4881,21 +4873,13 @@ class TranslatedFont {
         case OPS.constructPath:
           const minMax = operatorList.argsArray[i][2];
           // Override the fontBBox when it's undefined/empty (fixes 19624.pdf).
-          this.#computeCharBBox(minMax);
+          this._bbox ??= [Infinity, Infinity, -Infinity, -Infinity];
+          Util.rectBoundingBox(...minMax, this._bbox);
           break;
       }
       i++;
     }
   }
-
-  #computeCharBBox(bbox) {
-    this._bbox ||= [Infinity, Infinity, -Infinity, -Infinity];
-
-    this._bbox[0] = Math.min(this._bbox[0], bbox[0]);
-    this._bbox[1] = Math.min(this._bbox[1], bbox[1]);
-    this._bbox[2] = Math.max(this._bbox[2], bbox[2]);
-    this._bbox[3] = Math.max(this._bbox[3], bbox[3]);
-  }
 }
 
 class StateManager {

src/display/editor/drawers/freedraw.js

@@ -559,52 +559,46 @@ class FreeDrawOutline extends Outline {
     const outline = this.#outline;
     let lastX = outline[4];
     let lastY = outline[5];
-    let minX = lastX;
-    let minY = lastY;
-    let maxX = lastX;
-    let maxY = lastY;
+    const minMax = [lastX, lastY, lastX, lastY];
     let lastPointX = lastX;
     let lastPointY = lastY;
     const ltrCallback = isLTR ? Math.max : Math.min;
 
     for (let i = 6, ii = outline.length; i < ii; i += 6) {
+      const x = outline[i + 4],
+        y = outline[i + 5];
+
       if (isNaN(outline[i])) {
-        minX = Math.min(minX, outline[i + 4]);
-        minY = Math.min(minY, outline[i + 5]);
-        maxX = Math.max(maxX, outline[i + 4]);
-        maxY = Math.max(maxY, outline[i + 5]);
-        if (lastPointY < outline[i + 5]) {
-          lastPointX = outline[i + 4];
-          lastPointY = outline[i + 5];
-        } else if (lastPointY === outline[i + 5]) {
-          lastPointX = ltrCallback(lastPointX, outline[i + 4]);
+        Util.pointBoundingBox(x, y, minMax);
+
+        if (lastPointY < y) {
+          lastPointX = x;
+          lastPointY = y;
+        } else if (lastPointY === y) {
+          lastPointX = ltrCallback(lastPointX, x);
         }
       } else {
-        const bbox = Util.bezierBoundingBox(
-          lastX,
-          lastY,
-          ...outline.slice(i, i + 6)
-        );
-        minX = Math.min(minX, bbox[0]);
-        minY = Math.min(minY, bbox[1]);
-        maxX = Math.max(maxX, bbox[2]);
-        maxY = Math.max(maxY, bbox[3]);
+        const bbox = [Infinity, Infinity, -Infinity, -Infinity];
+        Util.bezierBoundingBox(lastX, lastY, ...outline.slice(i, i + 6), bbox);
+
+        Util.rectBoundingBox(...bbox, minMax);
+
         if (lastPointY < bbox[3]) {
           lastPointX = bbox[2];
           lastPointY = bbox[3];
         } else if (lastPointY === bbox[3]) {
           lastPointX = ltrCallback(lastPointX, bbox[2]);
         }
       }
-      lastX = outline[i + 4];
-      lastY = outline[i + 5];
+      lastX = x;
+      lastY = y;
     }
 
     const bbox = this.#bbox;
-    bbox[0] = minX - this.#innerMargin;
-    bbox[1] = minY - this.#innerMargin;
-    bbox[2] = maxX - minX + 2 * this.#innerMargin;
-    bbox[3] = maxY - minY + 2 * this.#innerMargin;
+    bbox[0] = minMax[0] - this.#innerMargin;
+    bbox[1] = minMax[1] - this.#innerMargin;
+    bbox[2] = minMax[2] - minMax[0] + 2 * this.#innerMargin;
+    bbox[3] = minMax[3] - minMax[1] + 2 * this.#innerMargin;
     this.lastPoint = [lastPointX, lastPointY];
   }
 

src/display/editor/drawers/highlight.js

@@ -15,6 +15,7 @@
 
 import { FreeDrawOutline, FreeDrawOutliner } from "./freedraw.js";
 import { Outline } from "./outline.js";
+import { Util } from "../../../shared/util.js";
 
 class HighlightOutliner {
   #box;
@@ -38,10 +39,7 @@ class HighlightOutliner {
    *   the last point of the boxes.
    */
   constructor(boxes, borderWidth = 0, innerMargin = 0, isLTR = true) {
-    let minX = Infinity;
-    let maxX = -Infinity;
-    let minY = Infinity;
-    let maxY = -Infinity;
+    const minMax = [Infinity, Infinity, -Infinity, -Infinity];
 
     // We round the coordinates to slightly reduce the number of edges in the
     // final outlines.
@@ -58,16 +56,13 @@ class HighlightOutliner {
       const right = [x2, y1, y2, false];
       this.#verticalEdges.push(left, right);
 
-      minX = Math.min(minX, x1);
-      maxX = Math.max(maxX, x2);
-      minY = Math.min(minY, y1);
-      maxY = Math.max(maxY, y2);
+      Util.rectBoundingBox(x1, y1, x2, y2, minMax);
     }
 
-    const bboxWidth = maxX - minX + 2 * innerMargin;
-    const bboxHeight = maxY - minY + 2 * innerMargin;
-    const shiftedMinX = minX - innerMargin;
-    const shiftedMinY = minY - innerMargin;
+    const bboxWidth = minMax[2] - minMax[0] + 2 * innerMargin;
+    const bboxHeight = minMax[3] - minMax[1] + 2 * innerMargin;
+    const shiftedMinX = minMax[0] - innerMargin;
+    const shiftedMinY = minMax[1] - innerMargin;
     const lastEdge = this.#verticalEdges.at(isLTR ? -1 : -2);
     const lastPoint = [lastEdge[0], lastEdge[2]];
 

src/display/editor/drawers/inkdraw.js

@@ -597,11 +597,7 @@ class InkDrawOutline extends Outline {
       if (line.length <= 12) {
         // We've only one or two points => no bezier curve.
         for (let i = 4, ii = line.length; i < ii; i += 6) {
-          const [x, y] = line.subarray(i, i + 2);
-          bbox[0] = Math.min(bbox[0], x);
-          bbox[1] = Math.min(bbox[1], y);
-          bbox[2] = Math.max(bbox[2], x);
-          bbox[3] = Math.max(bbox[3], y);
+          Util.pointBoundingBox(line[i], line[i + 1], bbox);
         }
         continue;
       }

src/shared/util.js

@@ -798,6 +798,20 @@ class Util {
     return [xLow, yLow, xHigh, yHigh];
   }
 
+  static pointBoundingBox(x, y, minMax) {
+    minMax[0] = Math.min(minMax[0], x);
+    minMax[1] = Math.min(minMax[1], y);
+    minMax[2] = Math.max(minMax[2], x);
+    minMax[3] = Math.max(minMax[3], y);
+  }
+
+  static rectBoundingBox(x0, y0, x1, y1, minMax) {
+    minMax[0] = Math.min(minMax[0], x0, x1);
+    minMax[1] = Math.min(minMax[1], y0, y1);
+    minMax[2] = Math.max(minMax[2], x0, x1);
+    minMax[3] = Math.max(minMax[3], y0, y1);
+  }
+
   static #getExtremumOnCurve(x0, x1, x2, x3, y0, y1, y2, y3, t, minMax) {
     if (t <= 0 || t >= 1) {
       return;
@@ -866,19 +880,11 @@ class Util {
 
   // From https://github.com/adobe-webplatform/Snap.svg/blob/b365287722a72526000ac4bfcf0ce4cac2faa015/src/path.js#L852
   static bezierBoundingBox(x0, y0, x1, y1, x2, y2, x3, y3, minMax) {
-    if (minMax) {
-      minMax[0] = Math.min(minMax[0], x0, x3);
-      minMax[1] = Math.min(minMax[1], y0, y3);
-      minMax[2] = Math.max(minMax[2], x0, x3);
-      minMax[3] = Math.max(minMax[3], y0, y3);
-    } else {
-      minMax = [
-        Math.min(x0, x3),
-        Math.min(y0, y3),
-        Math.max(x0, x3),
-        Math.max(y0, y3),
-      ];
-    }
+    minMax[0] = Math.min(minMax[0], x0, x3);
+    minMax[1] = Math.min(minMax[1], y0, y3);
+    minMax[2] = Math.max(minMax[2], x0, x3);
+    minMax[3] = Math.max(minMax[3], y0, y3);
+
     this.#getExtremum(
       x0,
       x1,
@@ -907,7 +913,6 @@ class Util {
       3 * (y1 - y0),
       minMax
     );
-    return minMax;
   }
 }
 

web/autolinker.js

@@ -59,11 +59,7 @@ function calculateLinkPosition(range, pdfPageView) {
     quadPoints[i + 2] = quadPoints[i + 6] = normalized[2];
     quadPoints[i + 5] = quadPoints[i + 7] = normalized[1];
 
-    rect[0] = Math.min(rect[0], normalized[0]);
-    rect[1] = Math.min(rect[1], normalized[1]);
-    rect[2] = Math.max(rect[2], normalized[2]);
-    rect[3] = Math.max(rect[3], normalized[3]);
-
+    Util.rectBoundingBox(...normalized, rect);
     i += 8;
   }
   return { quadPoints, rect };