Index: chrome/browser/manifest/manifest_icon_downloader.cc |
diff --git a/chrome/browser/manifest/manifest_icon_downloader.cc b/chrome/browser/manifest/manifest_icon_downloader.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..3525b654df01dfcbf8482dc81c8b6a3676308f53 |
--- /dev/null |
+++ b/chrome/browser/manifest/manifest_icon_downloader.cc |
@@ -0,0 +1,107 @@ |
+// Copyright 2015 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/manifest/manifest_icon_downloader.h" |
+ |
+#include "chrome/browser/manifest/manifest_icon_selector.h" |
+#include "content/public/browser/browser_thread.h" |
+#include "content/public/browser/web_contents.h" |
+#include "skia/ext/image_operations.h" |
+#include "ui/gfx/screen.h" |
+ |
+bool ManifestIconDownloader::Download( |
+ content::WebContents* web_contents, |
+ const GURL& icon_url, |
+ int ideal_icon_size_in_dp, |
+ const ManifestIconDownloader::IconFetchCallback& callback) { |
+ if (!web_contents || !icon_url.is_valid()) return false; |
+ |
+ const gfx::Screen* screen = |
+ gfx::Screen::GetScreenFor(web_contents->GetNativeView()); |
+ const float device_scale_factor = |
+ screen->GetPrimaryDisplay().device_scale_factor(); |
+ const float ideal_icon_size_in_px = |
+ ideal_icon_size_in_dp * device_scale_factor; |
+ |
+ web_contents->DownloadImage( |
+ icon_url, |
+ false, // is_favicon |
+ 0, // max_bitmap_size - 0 means no maximum size. |
+ false, // bypass_cache |
+ base::Bind(&ManifestIconDownloader::OnIconFetched, |
+ ideal_icon_size_in_px, |
+ callback)); |
+ return true; |
+} |
+ |
+void ManifestIconDownloader::OnIconFetched( |
+ int ideal_icon_size_in_px, |
+ const ManifestIconDownloader::IconFetchCallback& callback, |
+ int id, |
+ int http_status_code, |
+ const GURL& url, |
+ const std::vector<SkBitmap>& bitmaps, |
+ const std::vector<gfx::Size>& sizes) { |
+ DCHECK_CURRENTLY_ON(content::BrowserThread::UI); |
+ const int closest_index = FindClosestBitmapIndex( |
+ ideal_icon_size_in_px, bitmaps); |
+ |
+ if (closest_index == -1) { |
+ callback.Run(SkBitmap()); |
+ return; |
+ } |
+ |
+ const SkBitmap& chosen = bitmaps[closest_index]; |
+ |
+ // Only scale if we need to scale down. For scaling up we will let the system |
gone
2015/08/19 22:21:07
Given that FindClosestBitmapIndex() only returns b
Lalit Maganti
2015/08/20 16:48:00
Ah the algortihm doesn't take into account minimum
|
+ // handle that when it is required to display it. This saves space in the |
+ // webapp storage system as well. |
+ if (chosen.height() > ideal_icon_size_in_px) { |
+ content::BrowserThread::PostTask( |
+ content::BrowserThread::IO, |
+ FROM_HERE, |
+ base::Bind(&ManifestIconDownloader::ScaleIcon, |
+ ideal_icon_size_in_px, |
+ chosen, |
+ callback)); |
+ return; |
+ } |
+ |
+ callback.Run(chosen); |
+} |
+ |
+void ManifestIconDownloader::ScaleIcon( |
+ const int ideal_icon_size_in_px, |
+ const SkBitmap& bitmap, |
+ const ManifestIconDownloader::IconFetchCallback& callback) { |
+ DCHECK_CURRENTLY_ON(content::BrowserThread::IO); |
+ |
+ const SkBitmap& scaled = skia::ImageOperations::Resize( |
+ bitmap, |
+ skia::ImageOperations::RESIZE_BEST, |
+ ideal_icon_size_in_px, |
+ ideal_icon_size_in_px); |
+ content::BrowserThread::PostTask( |
+ content::BrowserThread::UI, |
+ FROM_HERE, |
+ base::Bind(callback, scaled)); |
+} |
+ |
+int ManifestIconDownloader::FindClosestBitmapIndex( |
+ int ideal_icon_size_in_px, |
+ const std::vector<SkBitmap>& bitmaps) { |
+ // There might be multiple bitmaps returned. The one to pick is bigger or |
+ // equal to the preferred size. |bitmaps| is ordered from bigger to smaller. |
gone
2015/08/19 22:21:07
the explicit restriction on |bitmaps| should be pu
Lalit Maganti
2015/08/20 16:48:00
Done.
|
+ int best_index = -1; |
+ for (size_t i = 0; i < bitmaps.size(); ++i) { |
+ if (bitmaps[i].height() != bitmaps[i].width()) |
+ continue; |
+ if (bitmaps[i].height() == ideal_icon_size_in_px) |
+ return i; |
+ if (bitmaps[i].height() < ideal_icon_size_in_px) |
+ break; |
+ best_index = i; |
+ } |
+ return best_index; |
+} |