Use a transparent color when setting fill/stroke colors in a pattern context but with no colorspace

src/core/evaluator.js

@@ -2007,9 +2007,8 @@ class PartialEvaluator {
                   localColorSpaceCache,
                 })
                 .then(function (colorSpace) {
-                  if (colorSpace) {
+                  stateManager.state.fillColorSpace =
-                    stateManager.state.fillColorSpace = colorSpace;
+                    colorSpace || ColorSpace.singletons.gray;
-                  }
                 })
             );
             return;
@@ -2033,9 +2032,8 @@ class PartialEvaluator {
                   localColorSpaceCache,
                 })
                 .then(function (colorSpace) {
-                  if (colorSpace) {
+                  stateManager.state.strokeColorSpace =
-                    stateManager.state.strokeColorSpace = colorSpace;
+                    colorSpace || ColorSpace.singletons.gray;
-                  }
                 })
             );
             return;
@@ -2079,7 +2077,12 @@ class PartialEvaluator {
             args = ColorSpace.singletons.rgb.getRgb(args, 0);
             break;
           case OPS.setFillColorN:
-            cs = stateManager.state.fillColorSpace;
+            cs = stateManager.state.patternFillColorSpace;
+            if (!cs) {
+              args = [];
+              fn = OPS.setFillTransparent;
+              break;
+            }
             if (cs.name === "Pattern") {
               next(
                 self.handleColorN(
@@ -2101,7 +2104,12 @@ class PartialEvaluator {
             fn = OPS.setFillRGBColor;
             break;
           case OPS.setStrokeColorN:
-            cs = stateManager.state.strokeColorSpace;
+            cs = stateManager.state.patternStrokeColorSpace;
+            if (!cs) {
+              args = [];
+              fn = OPS.setStrokeTransparent;
+              break;
+            }
             if (cs.name === "Pattern") {
               next(
                 self.handleColorN(
@@ -4873,8 +4881,26 @@ class EvalState {
     this.ctm = new Float32Array(IDENTITY_MATRIX);
     this.font = null;
     this.textRenderingMode = TextRenderingMode.FILL;
-    this.fillColorSpace = ColorSpace.singletons.gray;
+    this._fillColorSpace = ColorSpace.singletons.gray;
-    this.strokeColorSpace = ColorSpace.singletons.gray;
+    this._strokeColorSpace = ColorSpace.singletons.gray;
+    this.patternFillColorSpace = null;
+    this.patternStrokeColorSpace = null;
+  }
+
+  get fillColorSpace() {
+    return this._fillColorSpace;
+  }
+
+  set fillColorSpace(colorSpace) {
+    this._fillColorSpace = this.patternFillColorSpace = colorSpace;
+  }
+
+  get strokeColorSpace() {
+    return this._strokeColorSpace;
+  }
+
+  set strokeColorSpace(colorSpace) {
+    this._strokeColorSpace = this.patternStrokeColorSpace = colorSpace;
   }
 
   clone() {

src/display/canvas.js

@@ -2386,15 +2386,24 @@ class CanvasGraphics {
   }
 
   setStrokeRGBColor(r, g, b) {
-    const color = Util.makeHexColor(r, g, b);
+    this.ctx.strokeStyle = this.current.strokeColor = Util.makeHexColor(
-    this.ctx.strokeStyle = color;
+      r,
-    this.current.strokeColor = color;
+      g,
+      b
+    );
+  }
+
+  setStrokeTransparent() {
+    this.ctx.strokeStyle = this.current.strokeColor = "transparent";
   }
 
   setFillRGBColor(r, g, b) {
-    const color = Util.makeHexColor(r, g, b);
+    this.ctx.fillStyle = this.current.fillColor = Util.makeHexColor(r, g, b);
-    this.ctx.fillStyle = color;
+    this.current.patternFill = false;
-    this.current.fillColor = color;
+  }
+
+  setFillTransparent() {
+    this.ctx.fillStyle = this.current.fillColor = "transparent";
     this.current.patternFill = false;
   }
 

src/shared/util.js

@@ -342,6 +342,8 @@ const OPS = {
   paintImageMaskXObjectRepeat: 89,
   paintSolidColorImageMask: 90,
   constructPath: 91,
+  setStrokeTransparent: 92,
+  setFillTransparent: 93,
 };
 
 const PasswordResponses = {

test/pdfs/issue18466.pdf.link

@@ -0,0 +1 @@
+https://github.com/user-attachments/files/16319966/image2.pdf

test/test_manifest.json

@@ -10170,5 +10170,13 @@
     "firstPage": 1,
     "lastPage": 1,
     "type": "eq"
+  },
+  {
+    "id": "issue18466",
+    "file": "pdfs/issue18466.pdf",
+    "md5": "251197bf19b237e084551d19f885c6b6",
+    "rounds": 1,
+    "link": true,
+    "type": "eq"
   }
 ]