Refactor extension app icon.

chrome/browser/extensions/chrome_app_icon.cc

+// Copyright 2017 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/chrome_app_icon.h"
+
+#include <algorithm>
+
+#include "chrome/browser/extensions/chrome_app_icon_delegate.h"
+#include "chrome/browser/extensions/extension_util.h"
+#include "extensions/browser/extension_registry.h"
+#include "extensions/common/manifest_handlers/icons_handler.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/image/canvas_image_source.h"
+#include "ui/gfx/image/image_skia_operations.h"
+
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/extensions/gfx_utils.h"
+#endif
+
+namespace extensions {
+
+namespace {
+
+// Rounds the corners of a given image.
+// TODO(khmel): avoid sub-classing CanvasImageSource.
+class RoundedCornersImageSource : public gfx::CanvasImageSource {
+ public:
+  explicit RoundedCornersImageSource(const gfx::ImageSkia& icon)
+      : gfx::CanvasImageSource(icon.size(), false), icon_(icon) {}
+  ~RoundedCornersImageSource() override {}
+
+ private:
+  // gfx::CanvasImageSource overrides:
+  void Draw(gfx::Canvas* canvas) override {
+    // The radius used to round the app icon, based on 2 pixel per 48 pixels
+    // icon size.
+    const int rounding_radius =
+        std::max<int>(std::round(2.0 * icon_.width() / 48.0), 1);
+
+    canvas->DrawImageInt(icon_, 0, 0);
+
+    cc::PaintFlags masking_flags;
+    masking_flags.setBlendMode(SkBlendMode::kDstIn);
+    canvas->SaveLayerWithFlags(masking_flags);
+
+    cc::PaintFlags mask_flags;
+    mask_flags.setAntiAlias(true);
+    mask_flags.setColor(SK_ColorWHITE);
+    canvas->DrawRoundRect(gfx::Rect(icon_.width(), icon_.height()),
+                          rounding_radius, mask_flags);
+
+    canvas->Restore();
+  }
+
+  gfx::ImageSkia icon_;
+
+  DISALLOW_COPY_AND_ASSIGN(RoundedCornersImageSource);
+};
+
+}  // namespace
+
+ChromeAppIcon::ChromeAppIcon(ChromeAppIconDelegate* delegate,
+                             content::BrowserContext* browser_context,
+                             DestroyedCallback destroyed_callback,
+                             const std::string& app_id,
+                             int resource_size_in_dip)
+    : delegate_(delegate),
+      browser_context_(browser_context),
+      destroyed_callback_(std::move(destroyed_callback)),
+      app_id_(app_id),
+      resource_size_in_dip_(resource_size_in_dip) {
+  DCHECK(delegate_);
+  DCHECK(browser_context_);
+  DCHECK(!destroyed_callback_.is_null());
+  DCHECK_GE(resource_size_in_dip, 0);
+  Reload();
+}
+
+ChromeAppIcon::~ChromeAppIcon() {
+  std::move(destroyed_callback_).Run(this);
+}
+
+const Extension* ChromeAppIcon::GetExtension() {
+  return ExtensionRegistry::Get(browser_context_)
+      ->GetInstalledExtension(app_id_);
+}
+
+void ChromeAppIcon::Reload() {
+  const Extension* extension = GetExtension();
+  icon_ = base::MakeUnique<IconImage>(
+      browser_context_, extension, IconsInfo::GetIcons(extension),
+      resource_size_in_dip_, util::GetDefaultAppIcon(), this);
+  UpdateIcon();
+}
+
+bool ChromeAppIcon::IsValid() const {
+  DCHECK(icon_);
+  return icon_->is_valid();
+}
+
+void ChromeAppIcon::UpdateIcon() {
+  DCHECK(icon_);
+
+  image_skia_ = icon_->image_skia();
+#if defined(OS_CHROMEOS)
+  util::MaybeApplyChromeBadge(browser_context_, app_id_, &image_skia_);
+#endif
+
+  if (!util::IsAppLaunchable(app_id_, browser_context_)) {
+    const color_utils::HSL shift = {-1, 0, 0.6};
+    image_skia_ =
+        gfx::ImageSkiaOperations::CreateHSLShiftedImage(image_skia_, shift);
+  }
+
+  const Extension* extension = GetExtension();
+  if (extension && extension->from_bookmark()) {
+    image_skia_ = gfx::ImageSkia(new RoundedCornersImageSource(image_skia_),
+                                 image_skia_.size());
+  }
+
+  delegate_->OnIconUpdated(this);
+}
+
+void ChromeAppIcon::OnExtensionIconImageChanged(IconImage* icon) {
+  DCHECK_EQ(icon_.get(), icon);
+  UpdateIcon();
+}
+
+}  // namespace extensions