Add clipping to PDF form rendering

otfried · May 25, 2024 · b5f6f75 · b5f6f75
1 parent bc45f20
commit b5f6f75
Show file tree

Hide file tree

Showing 2 changed files with 7 additions and 0 deletions.
diff --git a/doc/news.txt b/doc/news.txt
@@ -32,6 +32,8 @@ Ipe 7.2.29
    restricted transformations (translations only or rigid motions
    only) (bug #493).
 
+ * Add clipping to PDF form rendering (ipepresenter bug #12).
+
 ----------------------------------------------------------------------
 
 Ipe 7.2.28 (2023-08-13)

diff --git a/src/ipecairo/ipecairopainter.cpp b/src/ipecairo/ipecairopainter.cpp
@@ -726,6 +726,11 @@ void CairoPainter::execute(const PdfDict *xform, const PdfDict *resources, bool
       mx.a[i] = m[i];
     cairoTransform(iCairo, mx);
   }
+  std::vector<double> bbox;
+  if (xform->getNumberArray("BBox", nullptr, bbox) && bbox.size() == 4) {
+    cairo_rectangle(iCairo, bbox[0], bbox[1], bbox[2] - bbox[0], bbox[3] - bbox[1]);
+    cairo_clip(iCairo);
+  }
   Buffer buffer = xform->inflate();
   BufferSource source(buffer);
   PdfParser parser(source);