Show client placeholders for Server LoFi images.

third_party/WebKit/Source/core/loader/resource/ImageResourceTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 533 matching lines @@
                              sizeof(kJpegImage));
   image_resource->Finish();
   EXPECT_FALSE(image_resource->ErrorOccurred());
   ASSERT_TRUE(image_resource->GetContent()->HasImage());
   EXPECT_FALSE(image_resource->GetContent()->GetImage()->IsNull());
   EXPECT_EQ(2, observer->ImageChangedCount());
   EXPECT_EQ(kJpegImageWidth, observer->ImageWidthOnLastImageChanged());
   // The observer should have been notified that the image load completed.
   EXPECT_TRUE(observer->ImageNotifyFinishedCalled());
   EXPECT_EQ(kJpegImageWidth, observer->ImageWidthOnImageNotifyFinished());
-  EXPECT_TRUE(image_resource->GetContent()->GetImage()->IsBitmapImage());
+  EXPECT_FALSE(image_resource->GetContent()->GetImage()->IsBitmapImage());
+  EXPECT_TRUE(image_resource->ShouldShowPlaceholder());
   EXPECT_EQ(kJpegImageWidth, image_resource->GetContent()->GetImage()->width());
   EXPECT_EQ(kJpegImageHeight,
             image_resource->GetContent()->GetImage()->height());
 
   // Call reloadIfLoFiOrPlaceholderImage() after the image has finished loading.
   image_resource->ReloadIfLoFiOrPlaceholderImage(fetcher,
                                                  Resource::kReloadAlways);
 
   EXPECT_EQ(3, observer->ImageChangedCount());
   TestThatReloadIsStartedThenServeReload(
@@ skipping 23 matching lines @@
                              sizeof(kJpegImage));
   image_resource->Finish();
   EXPECT_FALSE(image_resource->ErrorOccurred());
   ASSERT_TRUE(image_resource->GetContent()->HasImage());
   EXPECT_FALSE(image_resource->GetContent()->GetImage()->IsNull());
   EXPECT_EQ(2, observer->ImageChangedCount());
   EXPECT_EQ(kJpegImageWidth, observer->ImageWidthOnLastImageChanged());
   // The observer should have been notified that the image load completed.
   EXPECT_TRUE(observer->ImageNotifyFinishedCalled());
   EXPECT_EQ(kJpegImageWidth, observer->ImageWidthOnImageNotifyFinished());
-  EXPECT_TRUE(image_resource->GetContent()->GetImage()->IsBitmapImage());
+  EXPECT_FALSE(image_resource->GetContent()->GetImage()->IsBitmapImage());
+  EXPECT_TRUE(image_resource->ShouldShowPlaceholder());
   EXPECT_EQ(kJpegImageWidth, image_resource->GetContent()->GetImage()->width());
   EXPECT_EQ(kJpegImageHeight,
             image_resource->GetContent()->GetImage()->height());
 
   // Call reloadIfLoFiOrPlaceholderImage() after the image has finished loading.
   image_resource->ReloadIfLoFiOrPlaceholderImage(fetcher,
                                                  Resource::kReloadAlways);
 
   EXPECT_EQ(3, observer->ImageChangedCount());
   TestThatReloadIsStartedThenServeReload(
@@ skipping 80 matching lines @@
 
   EXPECT_EQ(3, observer->ImageChangedCount());
 
   TestThatReloadIsStartedThenServeReload(test_url, image_resource, content,
                                          observer.get(),
                                          WebCachePolicy::kBypassingCache);
 
   GetMemoryCache()->Remove(image_resource);
 }
 
-TEST(ImageResourceTest, ReloadIfLoFiOrPlaceholderDuringFetch) {
+TEST(ImageResourceTest, ReloadIfLoFiOrPlaceholderBeforeResponse) {
   KURL test_url(kParsedURLString, kTestURL);
   ScopedMockedURLLoad scoped_mocked_url_load(test_url, GetTestFilePath());
 
+  ResourceRequest request(test_url);
+  request.SetPreviewsState(WebURLRequest::kServerLoFiOn);
+  FetchParameters fetch_params(request);
+  ResourceFetcher* fetcher = CreateFetcher();
+
+  ImageResource* image_resource = ImageResource::Fetch(fetch_params, fetcher);
+  std::unique_ptr<MockImageResourceObserver> observer =
+      MockImageResourceObserver::Create(image_resource->GetContent());
+
+  EXPECT_FALSE(image_resource->ErrorOccurred());
+  EXPECT_TRUE(image_resource->ShouldShowPlaceholder());
+
+  // Call reloadIfLoFiOrPlaceholderImage() while the image is still loading.
+  image_resource->ReloadIfLoFiOrPlaceholderImage(fetcher,
+                                                 Resource::kReloadAlways);
+
+  EXPECT_EQ(1, observer->ImageChangedCount());
+  EXPECT_EQ(0, observer->ImageWidthOnLastImageChanged());
+  // The observer should not have been notified of completion yet, since the
+  // image is still loading.
+  EXPECT_FALSE(observer->ImageNotifyFinishedCalled());
+
+  TestThatReloadIsStartedThenServeReload(
+      test_url, image_resource, image_resource->GetContent(), observer.get(),
+      WebCachePolicy::kBypassingCache);
+}
+
+TEST(ImageResourceTest, ReloadIfLoFiOrPlaceholderDuringResponse) {
+  KURL test_url(kParsedURLString, kTestURL);
+  ScopedMockedURLLoad scoped_mocked_url_load(test_url, GetTestFilePath());
+
   ResourceRequest request(test_url);
   request.SetPreviewsState(WebURLRequest::kServerLoFiOn);
   FetchParameters fetch_params(request);
   ResourceFetcher* fetcher = CreateFetcher();
 
   ImageResource* image_resource = ImageResource::Fetch(fetch_params, fetcher);
   std::unique_ptr<MockImageResourceObserver> observer =
       MockImageResourceObserver::Create(image_resource->GetContent());
 
   // Send the image response.
+  ResourceResponse resource_response(test_url, "image/jpeg", sizeof(kJpegImage),
+                                     g_null_atom);
+  resource_response.AddHTTPHeaderField("chrome-proxy-content-transform",
+                                       "empty-image");
+
   image_resource->Loader()->DidReceiveResponse(
-      WrappedResourceResponse(ResourceResponse(
-          test_url, "image/jpeg", sizeof(kJpegImage), g_null_atom)));
+      WrappedResourceResponse(resource_response));
   image_resource->Loader()->DidReceiveData(
       reinterpret_cast<const char*>(kJpegImage), sizeof(kJpegImage));
 
   EXPECT_FALSE(image_resource->ErrorOccurred());
   ASSERT_TRUE(image_resource->GetContent()->HasImage());
   EXPECT_FALSE(image_resource->GetContent()->GetImage()->IsNull());
   EXPECT_EQ(1, observer->ImageChangedCount());
   EXPECT_EQ(kJpegImageWidth, observer->ImageWidthOnLastImageChanged());
   EXPECT_FALSE(observer->ImageNotifyFinishedCalled());
-  EXPECT_TRUE(image_resource->GetContent()->GetImage()->IsBitmapImage());
+  EXPECT_TRUE(image_resource->ShouldShowPlaceholder());
   EXPECT_EQ(kJpegImageWidth, image_resource->GetContent()->GetImage()->width());
   EXPECT_EQ(kJpegImageHeight,
             image_resource->GetContent()->GetImage()->height());
 
   // Call reloadIfLoFiOrPlaceholderImage() while the image is still loading.
   image_resource->ReloadIfLoFiOrPlaceholderImage(fetcher,
                                                  Resource::kReloadAlways);
 
   EXPECT_EQ(2, observer->ImageChangedCount());
   EXPECT_EQ(0, observer->ImageWidthOnLastImageChanged());
@@ skipping 865 matching lines @@
   ImageResource* image_resource = ImageResource::Create(request);
   image_resource->SetStatus(ResourceStatus::kPending);
   image_resource->NotifyStartLoad();
 
   std::unique_ptr<MockImageResourceObserver> observer =
       MockImageResourceObserver::Create(image_resource->GetContent());
 
   // Send the image response.
   ResourceResponse resource_response(KURL(), "image/jpeg", sizeof(kJpegImage2),
                                      g_null_atom);
-  resource_response.AddHTTPHeaderField("chrome-proxy", "q=low");
 
   image_resource->ResponseReceived(resource_response, nullptr);
 
   // This is number is sufficiently large amount of bytes necessary for the
   // image to be created (since the size is known). This was determined by
   // appending one byte at a time (with flushes) until the image was decoded.
   size_t meaningful_image_size = 280;
   image_resource->AppendData(reinterpret_cast<const char*>(kJpegImage2),
                              meaningful_image_size);
   size_t bytes_sent = meaningful_image_size;
@@ skipping 50 matching lines @@
   EXPECT_FALSE(image_resource->GetContent()->GetImage()->IsNull());
   EXPECT_EQ(5, observer->ImageChangedCount());
   EXPECT_TRUE(observer->ImageNotifyFinishedCalled());
   EXPECT_TRUE(image_resource->GetContent()->GetImage()->IsBitmapImage());
   EXPECT_EQ(50, image_resource->GetContent()->GetImage()->width());
   EXPECT_EQ(50, image_resource->GetContent()->GetImage()->height());
 
   WTF::SetTimeFunctionsForTesting(nullptr);
 }
 
+TEST(ImageResourceTest, ShowPlaceholderForServerLoFiWithBitAndHeaders) {
+  KURL test_url(kParsedURLString, kTestURL);
+  ScopedMockedURLLoad scoped_mocked_url_load(test_url, GetTestFilePath());
+
+  ResourceRequest request(test_url);
+  request.SetPreviewsState(WebURLRequest::kServerLoFiOn);
+  FetchParameters params{request};
+  ImageResource* image_resource = ImageResource::Fetch(params, CreateFetcher());
+  EXPECT_EQ(FetchParameters::kDisallowPlaceholder,
+            params.GetPlaceholderImageRequestType());
+  EXPECT_EQ(g_null_atom,
+            image_resource->GetResourceRequest().HttpHeaderField("range"));
+
+  EXPECT_TRUE(image_resource->ShouldShowPlaceholder());
+  std::unique_ptr<MockImageResourceObserver> observer =
+      MockImageResourceObserver::Create(image_resource->GetContent());
+
+  // Send the Server Lo-Fi image response, complete with Server Lo-Fi response
+  // headers.
+  ResourceResponse response(test_url, "image/jpeg", sizeof(kJpegImage),
+                            g_null_atom);
+  response.AddHTTPHeaderField("chrome-proxy-content-transform", "empty-image");
+
+  image_resource->Loader()->DidReceiveResponse(
+      WrappedResourceResponse(response));
+  image_resource->Loader()->DidReceiveData(
+      reinterpret_cast<const char*>(kJpegImage), sizeof(kJpegImage));
+  image_resource->Loader()->DidFinishLoading(
+      0.0, sizeof(kJpegImage), sizeof(kJpegImage), sizeof(kJpegImage));
+
+  EXPECT_EQ(ResourceStatus::kCached, image_resource->GetStatus());
+  EXPECT_TRUE(image_resource->ShouldShowPlaceholder());
+  EXPECT_LT(0, observer->ImageChangedCount());
+  EXPECT_EQ(kJpegImageWidth, observer->ImageWidthOnLastImageChanged());
+  EXPECT_TRUE(observer->ImageNotifyFinishedCalled());
+  EXPECT_EQ(kJpegImageWidth, observer->ImageWidthOnImageNotifyFinished());
+
+  ASSERT_TRUE(image_resource->GetContent()->HasImage());
+  EXPECT_EQ(kJpegImageWidth, image_resource->GetContent()->GetImage()->width());
+  EXPECT_EQ(kJpegImageHeight,
+            image_resource->GetContent()->GetImage()->height());
+  EXPECT_FALSE(image_resource->GetContent()->GetImage()->IsBitmapImage());
+}
+
+TEST(ImageResourceTest, DoNotShowPlaceholderForServerLoFiWithoutHeaders) {
+  KURL test_url(kParsedURLString, kTestURL);
+  ScopedMockedURLLoad scoped_mocked_url_load(test_url, GetTestFilePath());
+
+  ResourceRequest request(test_url);
+  request.SetPreviewsState(WebURLRequest::kServerLoFiOn);
+  FetchParameters params{request};
+  ImageResource* image_resource = ImageResource::Fetch(params, CreateFetcher());
+  EXPECT_EQ(FetchParameters::kDisallowPlaceholder,
+            params.GetPlaceholderImageRequestType());
+  EXPECT_EQ(g_null_atom,
+            image_resource->GetResourceRequest().HttpHeaderField("range"));
+
+  EXPECT_TRUE(image_resource->ShouldShowPlaceholder());
+  std::unique_ptr<MockImageResourceObserver> observer =
+      MockImageResourceObserver::Create(image_resource->GetContent());
+
+  // Send the image response without any Server Lo-Fi response headers.
+  image_resource->Loader()->DidReceiveResponse(
+      WrappedResourceResponse(ResourceResponse(
+          test_url, "image/jpeg", sizeof(kJpegImage), g_null_atom)));
+  image_resource->Loader()->DidReceiveData(
+      reinterpret_cast<const char*>(kJpegImage), sizeof(kJpegImage));
+  image_resource->Loader()->DidFinishLoading(
+      0.0, sizeof(kJpegImage), sizeof(kJpegImage), sizeof(kJpegImage));
+
+  EXPECT_EQ(WebURLRequest::kPreviewsOff,
+            image_resource->GetResourceRequest().GetPreviewsState());
+  EXPECT_FALSE(image_resource->ShouldShowPlaceholder());
+
+  EXPECT_EQ(ResourceStatus::kCached, image_resource->GetStatus());
+  EXPECT_LT(0, observer->ImageChangedCount());
+  EXPECT_EQ(kJpegImageWidth, observer->ImageWidthOnLastImageChanged());
+  EXPECT_TRUE(observer->ImageNotifyFinishedCalled());
+  EXPECT_EQ(kJpegImageWidth, observer->ImageWidthOnImageNotifyFinished());
+
+  ASSERT_TRUE(image_resource->GetContent()->HasImage());
+  EXPECT_EQ(kJpegImageWidth, image_resource->GetContent()->GetImage()->width());
+  EXPECT_EQ(kJpegImageHeight,
+            image_resource->GetContent()->GetImage()->height());
+  EXPECT_TRUE(image_resource->GetContent()->GetImage()->IsBitmapImage());
+}
+
+TEST(ImageResourceTest, ShowPlaceholderForServerLoFiWithHeadersButWithoutBit) {
+  const struct {
+    const char* header_name;
+    const char* header_value;
+  } tests[] = {
+      // New-style Server Lo-Fi response header.
+      {"chrome-proxy-content-transform", "empty-image"},
+      // Legacy Server Lo-Fi response header.
+      {"chrome-proxy", "q=low"},
+  };
+
+  for (const auto& test : tests) {
+    KURL test_url(kParsedURLString, kTestURL);
+    ScopedMockedURLLoad scoped_mocked_url_load(test_url, GetTestFilePath());
+
+    FetchParameters params{ResourceRequest(test_url)};
+    ImageResource* image_resource =
+        ImageResource::Fetch(params, CreateFetcher());
+    EXPECT_EQ(FetchParameters::kDisallowPlaceholder,
+              params.GetPlaceholderImageRequestType());
+    EXPECT_EQ(g_null_atom,
+              image_resource->GetResourceRequest().HttpHeaderField("range"));
+
+    EXPECT_FALSE(image_resource->ShouldShowPlaceholder());
+    std::unique_ptr<MockImageResourceObserver> observer =
+        MockImageResourceObserver::Create(image_resource->GetContent());
+
+    // Send a Server Lo-Fi image response, complete with Server Lo-Fi response
+    // headers.
+    ResourceResponse response(test_url, "image/jpeg", sizeof(kJpegImage),
+                              g_null_atom);
+    response.AddHTTPHeaderField(test.header_name, test.header_value);
+
+    image_resource->Loader()->DidReceiveResponse(
+        WrappedResourceResponse(response));
+    image_resource->Loader()->DidReceiveData(
+        reinterpret_cast<const char*>(kJpegImage), sizeof(kJpegImage));
+    image_resource->Loader()->DidFinishLoading(
+        0.0, sizeof(kJpegImage), sizeof(kJpegImage), sizeof(kJpegImage));
+
+    EXPECT_TRUE(image_resource->GetResourceRequest().GetPreviewsState() &
+                WebURLRequest::kServerLoFiOn);
+    EXPECT_TRUE(image_resource->ShouldShowPlaceholder());
+
+    EXPECT_EQ(ResourceStatus::kCached, image_resource->GetStatus());
+    EXPECT_LT(0, observer->ImageChangedCount());
+    EXPECT_EQ(kJpegImageWidth, observer->ImageWidthOnLastImageChanged());
+    EXPECT_TRUE(observer->ImageNotifyFinishedCalled());
+    EXPECT_EQ(kJpegImageWidth, observer->ImageWidthOnImageNotifyFinished());
+
+    ASSERT_TRUE(image_resource->GetContent()->HasImage());
+    EXPECT_EQ(kJpegImageWidth,
+              image_resource->GetContent()->GetImage()->width());
+    EXPECT_EQ(kJpegImageHeight,
+              image_resource->GetContent()->GetImage()->height());
+    EXPECT_FALSE(image_resource->GetContent()->GetImage()->IsBitmapImage());
+  }
+}
+
 }  // namespace
 }  // namespace blink