Progressing #47

README.md

@@ -385,7 +385,8 @@ If you need a binding to a Pdfium function that is not currently available, just
   `PdfAttachment::is_empty()` convenience functions; adds `libstdc++` and `libc++` crate features;
   adds color conversion functions to `PdfiumLibraryBindings`; corrects bugs in color conversion
   when working with `PdfPageImageObject`, as detailed in <https://github.com/ajrcarey/pdfium-render/issues/50>;
-  corrects some small typos in examples.
+  fixes a bug in the WASM implementation of `FPDFAnnot_GetAttachmentPoints()`; corrects
+  some small typos in examples.
 * 0.7.20: adds bindings for `FPDFPage_*Thumbnail*()`, `FPDFLink_*()`, and `FPDFText_Find*()` functions;
   adds `PdfAttachments::create_attachment_from_bytes()`, `PdfAttachments::create_attachment_from_file()`,
   `PdfAttachments::create_attachment_from_reader()`, `PdfAttachments::create_attachment_from_fetch()`,  

src/wasm.rs

@@ -4092,20 +4092,22 @@ impl PdfiumLibraryBindings for WasmPdfiumBindings {
 
         let state = PdfiumRenderWasmState::lock();
 
-        let len = quad_index as usize * size_of::<FS_POINTF>();
+        let len = size_of::<FS_QUADPOINTSF>();
 
-        let ptr_quad_points = if len > 0 { state.malloc(len) } else { 0 };
+        let ptr_quad_points = state.malloc(len);
 
         let result = state
             .call(
                 "FPDFAnnot_GetAttachmentPoints",
                 JsFunctionArgumentType::Number,
                 Some(vec![
                     JsFunctionArgumentType::Pointer,
+                    JsFunctionArgumentType::Number,
                     JsFunctionArgumentType::Pointer,
                 ]),
-                Some(&JsValue::from(Array::of2(
+                Some(&JsValue::from(Array::of3(
                     &Self::js_value_from_annotation(annot),
+                    &JsValue::from_f64(quad_index as f64),
                     &Self::js_value_from_offset(ptr_quad_points),
                 ))),
             )