Save in an isolate when available

DavBfr · Mar 11, 2024 · 462bd71 · 462bd71
1 parent a67f42d
commit 462bd71
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Showing 5 changed files with 26 additions and 7 deletions.
diff --git a/pdf/CHANGELOG.md b/pdf/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 3.11.0
+
+- Save in an isolate when available
+
 ## 3.10.8
 
 - Add Flutter's Logical Pixel constant

diff --git a/pdf/lib/src/pdf/document.dart b/pdf/lib/src/pdf/document.dart
@@ -251,11 +251,13 @@ class PdfDocument {
 
   /// Generate the PDF document as a memory file
   Future<Uint8List> save() async {
-    final os = PdfStream();
-    if (prev != null) {
-      os.putBytes(prev!.bytes);
-    }
-    await _write(os);
-    return os.output();
+    return pdfCompute(() async {
+      final os = PdfStream();
+      if (prev != null) {
+        os.putBytes(prev!.bytes);
+      }
+      await _write(os);
+      return os.output();
+    });
   }
 }
diff --git a/pdf/lib/src/pdf/io/js.dart b/pdf/lib/src/pdf/io/js.dart
@@ -20,3 +20,10 @@ import '../format/object_base.dart';
 
 /// Zip compression function
 DeflateCallback defaultDeflate = const ZLibEncoder().encode;
+
+/// The dart:html implementation of [pdfCompute].
+@pragma('dart2js:tryInline')
+Future<R> pdfCompute<R>(Future<R> Function() computation) async {
+  await null;
+  return computation();
+}
diff --git a/pdf/lib/src/pdf/io/vm.dart b/pdf/lib/src/pdf/io/vm.dart
@@ -15,8 +15,14 @@
  */
 
 import 'dart:io';
+import 'dart:isolate';
 
 import '../format/object_base.dart';
 
 /// Zip compression function
 DeflateCallback defaultDeflate = zlib.encode;
+
+/// The dart:io implementation of [pdfCompute].
+@pragma('vm:prefer-inline')
+Future<R> pdfCompute<R>(Future<R> Function() computation) async =>
+    Isolate.run<R>(computation, debugName: 'dart_pdf');
diff --git a/pdf/pubspec.yaml b/pdf/pubspec.yaml
@@ -15,7 +15,7 @@ topics:
 version: 3.10.8
 
 environment:
-  sdk: ">=2.18.0 <4.0.0"
+  sdk: ">=2.19.0 <4.0.0"
 
 dependencies:
   archive: ^3.1.0