Skip bogus d1 operators in Type3-glyphs (issue 14953)

In the `src/display/canvas.js` code the `d1` operator will be used to set the clipping region, and it obviously cannot be empty since that prevents the Type3-glyph from rendering.

Also, the patch removes an outdated comment; refer to PR 12718.

src/core/evaluator.js

@@ -4463,21 +4463,30 @@ class TranslatedFont {
         "Type3 glyph shall start with the d1 operator."
       );
     }
-    if (isEmptyBBox) {
+    const charBBox = Util.normalizeRect(operatorList.argsArray[0].slice(2)),
+      width = charBBox[2] - charBBox[0],
+      height = charBBox[3] - charBBox[1];
+
+    if (width === 0 || height === 0) {
+      // Skip the d1 operator when its bounds are bogus (fixes issue14953.pdf).
+      operatorList.fnArray.splice(0, 1);
+      operatorList.argsArray.splice(0, 1);
+    } else if (isEmptyBBox) {
       if (!this._bbox) {
         this._bbox = [Infinity, Infinity, -Infinity, -Infinity];
       }
-      const charBBox = Util.normalizeRect(operatorList.argsArray[0].slice(2));
-
       this._bbox[0] = Math.min(this._bbox[0], charBBox[0]);
       this._bbox[1] = Math.min(this._bbox[1], charBBox[1]);
       this._bbox[2] = Math.max(this._bbox[2], charBBox[2]);
       this._bbox[3] = Math.max(this._bbox[3], charBBox[3]);
     }
-    let i = 1,
+
+    let i = 0,
       ii = operatorList.length;
     while (i < ii) {
       switch (operatorList.fnArray[i]) {
+        case OPS.setCharWidthAndBounds:
+          break; // Handled above.
         case OPS.setStrokeColorSpace:
         case OPS.setFillColorSpace:
         case OPS.setStrokeColor:

src/display/canvas.js

@@ -2652,8 +2652,6 @@ class CanvasGraphics {
   }
 
   setCharWidthAndBounds(xWidth, yWidth, llx, lly, urx, ury) {
-    // TODO According to the spec we're also suppose to ignore any operators
-    // that set color or include images while processing this type3 font.
     this.ctx.rect(llx, lly, urx - llx, ury - lly);
     this.ctx.clip();
     this.endPath();

test/pdfs/.gitignore

@@ -49,6 +49,7 @@
 !issue7426.pdf
 !issue7439.pdf
 !issue7847_radial.pdf
+!issue14953.pdf
 !issue7446.pdf
 !issue7492.pdf
 !issue7544.pdf

test/test_manifest.json

@@ -2058,6 +2058,12 @@
        "rounds": 1,
        "type": "eq"
     },
+    {  "id": "issue14953",
+       "file": "pdfs/issue14953.pdf",
+       "md5": "dd7d6cb92e58d75a0eb8c0476a3bc64a",
+       "rounds": 1,
+       "type": "eq"
+    },
     {  "id": "extgstate-text",
        "file": "pdfs/extgstate.pdf",
        "md5": "001bb4ec04463a01d93aad748361f049",