Resize and save custom wallpaper to large and small size

chrome/browser/chromeos/login/simple_jpeg_encoder.cc

+// 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/chromeos/login/simple_jpeg_encoder.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/threading/worker_pool.h"
+#include "chrome/browser/chromeos/login/user_manager.h"
+#include "chrome/common/url_constants.h"
+#include "ui/gfx/codec/jpeg_codec.h"
+#include "ui/gfx/size.h"
+#include "ui/gfx/skia_util.h"
+
+namespace chromeos {
+
+namespace {
+const int kCustomWallpaperQuality = 90;
+}
+
+SimpleJpegEncoder::SimpleJpegEncoder(
+    scoped_refptr<base::RefCountedBytes> data,
+    SkBitmap image)
+    : data_(data),
+      image_(image) {
+}
+
+void SimpleJpegEncoder::Run(EncoderCallback callback) {
+  base::WorkerPool::PostTaskAndReply(
+      FROM_HERE,
+      base::Bind(&SimpleJpegEncoder::EncodeWallpaper, this),
+      base::Bind(callback, data_),
+      true /* task_is_slow */);
+}
+
+void SimpleJpegEncoder::EncodeWallpaper() {
+  if (cancel_flag_.IsSet())
+    return;
+  SkAutoLockPixels lock_input(image_);
+  gfx::JPEGCodec::Encode(
+      reinterpret_cast<unsigned char*>(image_.getAddr32(0, 0)),
+      gfx::JPEGCodec::FORMAT_SkBitmap,
+      image_.width(),
+      image_.height(),
+      image_.width() * image_.bytesPerPixel(),
+      kCustomWallpaperQuality, &data_->data());
+}
+
+void SimpleJpegEncoder::Cancel() {
+  cancel_flag_.Set();
+}
+
+SimpleJpegEncoder::~SimpleJpegEncoder() {
+}
+
+}  // namespace chromeos