Add a test for creating images from bytes. (#10799)

shell/common/fixtures/shell_test.dart

@@ -75,3 +75,22 @@ void testSkiaResourceCacheSendsResponse() {
     callback,
   );
 }
+
+void notifyWidthHeight(int width, int height) native 'NotifyWidthHeight';
+
+@pragma('vm:entry-point')
+void canCreateImageFromDecompressedData() {
+  const int imageWidth = 10;
+  const int imageHeight = 10;
+  final Uint8List pixels = Uint8List.fromList(List<int>.generate(
+    imageWidth * imageHeight * 4,
+    (int i) => i % 4 < 2 ? 0x00 : 0xFF,
+  ));
+
+
+  decodeImageFromPixels(
+      pixels, imageWidth, imageHeight, PixelFormat.rgba8888,
+      (Image image) {
+    notifyWidthHeight(image.width, image.height);
+  });
+}

shell/common/shell_unittests.cc

@@ -22,6 +22,7 @@
 #include "flutter/shell/common/switches.h"
 #include "flutter/shell/common/thread_host.h"
 #include "flutter/testing/testing.h"
+#include "third_party/tonic/converter/dart_converter.h"
 
 namespace flutter {
 namespace testing {
@@ -730,5 +731,38 @@ TEST_F(ShellTest, SetResourceCacheSizeNotifiesDart) {
             static_cast<size_t>(10000U));
 }
 
+TEST_F(ShellTest, CanCreateImagefromDecompressedBytes) {
+  Settings settings = CreateSettingsForFixture();
+  auto task_runner = GetThreadTaskRunner();
+
+  TaskRunners task_runners("test", task_runner, task_runner, task_runner,
+                           task_runner);
+
+  std::unique_ptr<Shell> shell =
+      CreateShell(std::move(settings), std::move(task_runners));
+
+  // Create the surface needed by rasterizer
+  PlatformViewNotifyCreated(shell.get());
+
+  auto configuration = RunConfiguration::InferFromSettings(settings);
+  configuration.SetEntrypoint("canCreateImageFromDecompressedData");
+
+  fml::AutoResetWaitableEvent latch;
+  AddNativeCallback("NotifyWidthHeight",
+                    CREATE_NATIVE_ENTRY([&latch](auto args) {
+                      auto width = tonic::DartConverter<int>::FromDart(
+                          Dart_GetNativeArgument(args, 0));
+                      auto height = tonic::DartConverter<int>::FromDart(
+                          Dart_GetNativeArgument(args, 1));
+                      ASSERT_EQ(width, 10);
+                      ASSERT_EQ(height, 10);
+                      latch.Signal();
+                    }));
+
+  RunEngine(shell.get(), std::move(configuration));
+
+  latch.Wait();
+}
+
 }  // namespace testing
 }  // namespace flutter