Fix clipping with cmyk

Author: AshishBhattarai

lib/write_svg.js

@@ -627,6 +627,15 @@ export default function (doc, svg, x, y, options) {
     luminosity: 'Luminosity',
   };
 
+  const maskBackdrop = [0, 0, 0];
+  if (doc._activeColorProfile) {
+    let i = doc._activeColorProfile.channels - 3;
+    while (i > 0) {
+      maskBackdrop.push(0);
+      i--;
+    }
+  }
+
   function docBeginGroup(bbox) {
     let group = new (function PDFGroup() {})();
     group.name = 'G' + (doc._groupCount = (doc._groupCount || 0) + 1);
@@ -690,9 +699,12 @@ export default function (doc, svg, x, y, options) {
       ca: 1,
       BM: 'Normal',
       SMask: {
-        S: 'Luminosity',
+        // Needs to be Alpha for clipping to work with cmyk color space
+        // Clipping mode is reproducing svg clip-path by drawing everything inside clip path with DefaultColors.white [1,1,1,1]
+        // And everything outside (not draw, defaults to [0,0,0,0]) is masked off
+        S: clip ? 'Alpha' : 'Luminosity',
         G: group.xobj,
-        BC: clip ? [0, 0, 0] : [1, 1, 1],
+        BC: maskBackdrop,
       },
     });
     gstate.end();
@@ -1056,7 +1068,7 @@ export default function (doc, svg, x, y, options) {
     let newColor = color[0].slice(),
       newOpacity = color[1] * opacity;
     if (isMask) {
-      for (let i = 0; i < color.length; i++) {
+      for (let i = 0; i < newColor.length; i++) {
         newColor[i] *= newOpacity;
       }
       return [newColor, 1];
@@ -3325,7 +3337,7 @@ export default function (doc, svg, x, y, options) {
       this.drawChildren(false, true);
       doc.restore();
       docEndGroup(group);
-      docApplyMask(group, true);
+      docApplyMask(group, false);
     };
   };
 

package.json

@@ -9,7 +9,7 @@
     "document",
     "vector"
   ],
-  "version": "0.17.5",
+  "version": "0.17.51",
   "homepage": "http://pdfkit.org/",
   "author": {
     "name": "Devon Govett",

types/write_svg.d.ts

@@ -17,7 +17,7 @@ export default function SVGtoPDF(
   options?: SVGtoPDF.Options,
 ): void;
 
-declare namespace SVGtoPDF {
+export declare namespace SVGtoPDF {
   type RGBColor = [[number, number, number], number];
   type CMYKColor = [[number, number, number, number], number];