Improve large tab strip by leveraging touch icons when present

chrome/browser/ui/touch/tabs/touch_tab_strip_controller.cc

+// Copyright (c) 2011 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/ui/touch/tabs/touch_tab_strip_controller.h"
+
+#include "chrome/browser/extensions/extension_tab_helper.h"
+#include "chrome/browser/favicon/favicon_tab_helper.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
+#include "chrome/browser/ui/views/tabs/base_tab_strip.h"
+#include "chrome/browser/ui/views/tabs/tab_renderer_data.h"
+#include "skia/ext/image_operations.h"
+#include "ui/gfx/codec/png_codec.h"
+#include "ui/gfx/favicon_size.h"
+
+// static

[sky, 2011/06/10 15:38:18]

Remove the comment.

[Emmanuel Saint-loubert-Bié, 2011/06/10 16:09:10]

Done.

+static void calc_touch_icon_target_size(int* width, int* height) {
+  if (*width > kTouchTargetIconSize || *height > kTouchTargetIconSize) {
+    // Too big, resize it maintaining the aspect ratio.
+    float aspect_ratio = static_cast<float>(*width) /
+                         static_cast<float>(*height);
+    *height = kTouchTargetIconSize;
+    *width = static_cast<int>(aspect_ratio * *height);
+    if (*width > kTouchTargetIconSize) {
+      *width = kTouchTargetIconSize;
+      *height = static_cast<int>(*width / aspect_ratio);
+    }
+  }
+}
+
+TouchTabStripController::TouchTabStripController(Browser* browser,
+                                                 TabStripModel* model)
+    : BrowserTabStripController(browser, model) {
+}
+
+TouchTabStripController::~TouchTabStripController() {
+}
+
+void TouchTabStripController::TabChangedAt(TabContentsWrapper* contents,
+                                           int model_index,
+                                           TabChangeType change_type) {
+  // request a large icon if needed
+  if (change_type == LOADING_ONLY) {
+    FaviconService* favicon_service = profile()->GetFaviconService(
+        Profile::EXPLICIT_ACCESS);
+    if (favicon_service) {
+      url_canon::Replacements<char> replacements;
+      replacements.ClearUsername();
+      replacements.ClearPassword();
+      replacements.ClearQuery();
+      replacements.ClearRef();
+      GURL page_url = contents->tab_contents()->GetURL().ReplaceComponents(
+          replacements);
+      if (touch_icon_map_.find(page_url) == touch_icon_map_.end()) {
+        CancelableRequestProvider::Handle h =
+            favicon_service->GetFaviconForURL(
+                page_url,
+                history::TOUCH_ICON | history::TOUCH_PRECOMPOSED_ICON,
+                &consumer_,
+                NewCallback(this,
+                    &TouchTabStripController::OnTouchIconAvailable));
+        gurl_vector_.push_back(RequestInfo(page_url, model_index));
+        consumer_.SetClientData(favicon_service, h, gurl_vector_.size() - 1);
+      }
+    }
+  }
+  // Finally call parent's method
+  BrowserTabStripController::TabChangedAt(contents, model_index, change_type);
+}
+
+void TouchTabStripController::SetTabRendererDataFromModel(
+    TabContents* contents,
+    int model_index,
+    TabRendererData* data) {
+  // Call parent first
+  BrowserTabStripController::SetTabRendererDataFromModel(contents, model_index,
+      data);
+  // Lookup for a touch icon
+  if (touch_icon_map_.find(data->url) != touch_icon_map_.end()) {
+    data->favicon = touch_icon_map_[data->url];
+  }
+}
+
+void TouchTabStripController::OnTouchIconAvailable(
+    FaviconService::Handle h,
+    history::FaviconData favicon) {
+  if (!favicon.is_valid()) {
+    return;
+  }
+  // The decoder will leave our bitmap empty on error.
+  SkBitmap bitmap;
+  gfx::PNGCodec::Decode(favicon.image_data->front(),
+      favicon.image_data->size(),
+      &bitmap);
+  if (bitmap.isNull())
+    return;
+  // Look up the index, sIsValidIndexcale the image and update map
+  FaviconService* favicon_service = profile()->GetFaviconService(
+      Profile::EXPLICIT_ACCESS);
+  int vector_index = consumer_.GetClientData(favicon_service, h);
+  int width = bitmap.width();
+  int height = bitmap.height();
+  if (width == kTouchTargetIconSize && height == kTouchTargetIconSize) {
+    touch_icon_map_[gurl_vector_[vector_index].first] = bitmap;
+  } else {
+    calc_touch_icon_target_size(&width, &height);
+    touch_icon_map_[gurl_vector_[vector_index].first] =
+        skia::ImageOperations::Resize(bitmap,
+            skia::ImageOperations::RESIZE_BEST, width, height);
+  }
+  // refresh
+  int model_index = gurl_vector_[vector_index].second;
+  if (IsValidIndex(model_index))
+      browser_->GetTabContentsAt(model_index)->NotifyNavigationStateChanged(
+          TabContents::INVALIDATE_TAB);
+}
+