chromeos: Fix pixelated icons in app list and launcher (part 2) (by xiyuan)

chrome/browser/extensions/extension_icon_image_unittest.cc

Index: chrome/browser/extensions/extension_icon_image_unittest.cc
diff --git a/chrome/browser/extensions/extension_icon_image_unittest.cc b/chrome/browser/extensions/extension_icon_image_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5693396b02e9423ee648e9eed248cbd492134dac
--- /dev/null
+++ b/chrome/browser/extensions/extension_icon_image_unittest.cc
@@ -0,0 +1,264 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/extensions/extension_icon_image.h"
+
+#include "base/json/json_file_value_serializer.h"
+#include "base/message_loop.h"
+#include "base/path_service.h"
+#include "chrome/common/chrome_paths.h"
+#include "chrome/common/extensions/extension.h"
+#include "content/public/test/test_browser_thread.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using content::BrowserThread;
+using extensions::Extension;
+using extensions::IconImage;
+
+namespace {
+
+class ExtensionIconImageTest : public testing::Test,
+                               public IconImage::Observer {
+ public:
+  ExtensionIconImageTest()
+      : image_loaded_count_(0),
+        image_load_failure_count_(0),
+        quit_in_image_loaded_(false),
+        ui_thread_(BrowserThread::UI, &ui_loop_),
+        file_thread_(BrowserThread::FILE),
+        io_thread_(BrowserThread::IO) {
+  }
+
+  virtual ~ExtensionIconImageTest() {}
+
+  void WaitForImageLoad() {
+    // ExtensionIconImage may return synchronously, in which case there's
+    // nothing to wait for.
+    if (image_loaded_count_ > 0 || image_load_failure_count_ > 0)
+      return;
+    quit_in_image_loaded_ = true;
+    MessageLoop::current()->Run();
+    quit_in_image_loaded_ = false;
+  }
+
+  int ImageLoadedCount() {
+    int result = image_loaded_count_;
+    image_loaded_count_ = 0;
+    return result;
+  }
+
+  int ImageLoadFailureCount() {
+    int result = image_load_failure_count_;
+    image_load_failure_count_ = 0;
+    return result;
+  }
+
+  scoped_refptr<Extension> CreateExtension(const char* name,
+                                           Extension::Location location) {
+    // Create and load an extension.
+    FilePath test_file;
+    if (!PathService::Get(chrome::DIR_TEST_DATA, &test_file)) {
+      EXPECT_FALSE(true);
+      return NULL;
+    }
+    test_file = test_file.AppendASCII("extensions").AppendASCII(name);
+    int error_code = 0;
+    std::string error;
+    JSONFileValueSerializer serializer(test_file.AppendASCII("app.json"));
+    scoped_ptr<DictionaryValue> valid_value(
+        static_cast<DictionaryValue*>(serializer.Deserialize(&error_code,
+                                                             &error)));
+    EXPECT_EQ(0, error_code) << error;
+    if (error_code != 0)
+      return NULL;
+
+    EXPECT_TRUE(valid_value.get());
+    if (!valid_value.get())
+      return NULL;
+
+    return Extension::Create(test_file, location, *valid_value,
+                             Extension::NO_FLAGS, &error);
+  }
+
+  // testing::Test overrides:
+  virtual void SetUp() OVERRIDE {
+    file_thread_.Start();
+    io_thread_.Start();
+  }
+
+  // IconImage::Delegate overrides:
+  virtual void OnExtensionIconImageChanged(IconImage* image) OVERRIDE {
+    image_loaded_count_++;
+    if (quit_in_image_loaded_)
+      MessageLoop::current()->Quit();
+  }
+
+  virtual void OnIconImageLoadFailed(IconImage* image,
+                                     ui::ScaleFactor scale_factor) OVERRIDE {
+    image_load_failure_count_++;
+    if (quit_in_image_loaded_)
+      MessageLoop::current()->Quit();
+  }
+
+ private:
+  int image_loaded_count_;
+  int image_load_failure_count_;
+  bool quit_in_image_loaded_;
+  MessageLoop ui_loop_;
+  content::TestBrowserThread ui_thread_;
+  content::TestBrowserThread file_thread_;
+  content::TestBrowserThread io_thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionIconImageTest);
+};
+
+}  // namespace
+
+TEST_F(ExtensionIconImageTest, Basic) {
+  scoped_refptr<Extension> extension(CreateExtension(
+      "extension_icon_image", Extension::INVALID));
+  ASSERT_TRUE(extension.get() != NULL);
+
+  IconImage image(
+      extension,
+      extension->icons(),
+      extension_misc::EXTENSION_ICON_BITTY,
+      this);
+
+  // No representations in |image_| yet.
+  gfx::ImageSkia::ImageSkiaReps image_reps = image.image_skia().image_reps();
+  ASSERT_EQ(0u, image_reps.size());
+
+  // Gets representation for a scale factor.
+  image.image_skia().GetRepresentation(ui::SCALE_FACTOR_100P);
+  WaitForImageLoad();
+  EXPECT_EQ(1, ImageLoadedCount());
+  EXPECT_EQ(0, ImageLoadFailureCount());
+
+  // Gets representation for an additional scale factor.
+  image.image_skia().GetRepresentation(ui::SCALE_FACTOR_200P);
+  WaitForImageLoad();
+  EXPECT_EQ(1, ImageLoadedCount());
+  EXPECT_EQ(0, ImageLoadFailureCount());
+
+  gfx::ImageSkiaRep image_rep =
+      image.image_skia().GetRepresentation(ui::SCALE_FACTOR_100P);
+  EXPECT_EQ(extension_misc::EXTENSION_ICON_BITTY,
+            image_rep.pixel_width());
+
+  image_rep = image.image_skia().GetRepresentation(ui::SCALE_FACTOR_200P);
+  EXPECT_EQ(extension_misc::EXTENSION_ICON_SMALL,
+            image_rep.pixel_width());
+}
+
+// If we can't load icon with the exact size, but a bigger resource is
+// available.
+TEST_F(ExtensionIconImageTest, FallbackToBigger) {
+  scoped_refptr<Extension> extension(CreateExtension(
+      "extension_icon_image", Extension::INVALID));
+  ASSERT_TRUE(extension.get() != NULL);
+
+  IconImage image(
+      extension,
+      extension->icons(),
+      extension_misc::EXTENSION_ICON_BITTY,
+      this);
+
+  // Get representation for 2x.
+  image.image_skia().GetRepresentation(ui::SCALE_FACTOR_200P);
+
+  WaitForImageLoad();
+  EXPECT_EQ(1, ImageLoadedCount());
+  EXPECT_EQ(0, ImageLoadFailureCount());
+
+  gfx::ImageSkiaRep image_rep =
+      image.image_skia().GetRepresentation(ui::SCALE_FACTOR_200P);
+
+  // We should have found a bigger resource and it should have been resized.
+  EXPECT_EQ(ui::SCALE_FACTOR_200P, image_rep.scale_factor());
+  EXPECT_EQ(2 * extension_misc::EXTENSION_ICON_BITTY,
+            image_rep.pixel_width());
+}
+
+// There is no resource with either exact or bigger size, but there is a smaller
+// resource.
+TEST_F(ExtensionIconImageTest, FallbackToSmallerWhenNoBigger) {
+  scoped_refptr<Extension> extension(CreateExtension(
+      "extension_icon_image", Extension::INVALID));
+  ASSERT_TRUE(extension.get() != NULL);
+
+  IconImage image(
+      extension,
+      extension->icons(),
+      extension_misc::EXTENSION_ICON_SMALL,
+      this);
+
+  // Attempt to get representation for 2x.
+  image.image_skia().GetRepresentation(ui::SCALE_FACTOR_200P);
+
+  WaitForImageLoad();
+  EXPECT_EQ(1, ImageLoadedCount());
+  EXPECT_EQ(0, ImageLoadFailureCount());
+
+  gfx::ImageSkiaRep image_rep =
+      image.image_skia().GetRepresentation(ui::SCALE_FACTOR_200P);
+
+  // We should have loaded the biggest smaller resource. In this case the
+  // loaded resource should not be resized.
+  EXPECT_EQ(ui::SCALE_FACTOR_200P, image_rep.scale_factor());
+  EXPECT_EQ(extension_misc::EXTENSION_ICON_MEDIUM,
+            image_rep.pixel_width());
+}
+
+// There is no resource with exact size, but there is a smaller and a bigger
+// one. Requested size is smaller than 32 though, so the smaller resource should
+// be loaded.
+TEST_F(ExtensionIconImageTest, FallbackToSmaller) {
+  scoped_refptr<Extension> extension(CreateExtension(
+      "extension_icon_image", Extension::INVALID));
+  ASSERT_TRUE(extension.get() != NULL);
+
+  IconImage image(
+      extension,
+      extension->icons(),
+      17,
+      this);
+
+  // Attempt to get representation for 1x.
+  image.image_skia().GetRepresentation(ui::SCALE_FACTOR_100P);
+
+  WaitForImageLoad();
+  EXPECT_EQ(1, ImageLoadedCount());
+  EXPECT_EQ(0, ImageLoadFailureCount());
+
+  gfx::ImageSkiaRep image_rep =
+      image.image_skia().GetRepresentation(ui::SCALE_FACTOR_100P);
+
+  // We should have loaded smaller (not resized) resource.
+  EXPECT_EQ(ui::SCALE_FACTOR_100P, image_rep.scale_factor());
+  EXPECT_EQ(extension_misc::EXTENSION_ICON_BITTY,
+            image_rep.pixel_width());
+}
+
+// If resource set is empty, failure should be reported.
+TEST_F(ExtensionIconImageTest, NoResources) {
+  scoped_refptr<Extension> extension(CreateExtension(
+      "extension_icon_image", Extension::INVALID));
+  ASSERT_TRUE(extension.get() != NULL);
+
+  ExtensionIconSet empty_icon_set;
+
+  IconImage image(
+      extension,
+      empty_icon_set,
+      extension_misc::EXTENSION_ICON_SMALLISH,
+      this);
+
+  // Attempt to get representation for 2x.
+  image.image_skia().GetRepresentation(ui::SCALE_FACTOR_200P);
+
+  WaitForImageLoad();
+  EXPECT_EQ(0, ImageLoadedCount());
+  EXPECT_EQ(1, ImageLoadFailureCount());
+}