Add SetImageData api to chrome.clipboard.

chrome/browser/extensions/clipboard_extension_helper_chromeos.cc

+// Copyright 2016 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/clipboard_extension_helper_chromeos.h"
+
+#include "base/callback_helpers.h"
+#include "base/macros.h"
+#include "base/metrics/histogram_macros.h"
+#include "base/synchronization/cancellation_flag.h"
+#include "chrome/browser/image_decoder.h"
+#include "content/public/browser/browser_thread.h"
+#include "ui/base/clipboard/scoped_clipboard_writer.h"
+
+using content::BrowserThread;
+
+namespace extensions {
+
+namespace clipboard = api::clipboard;
+
+class ClipboardExtensionHelper::ClipboardImageDataDecoder
+    : public ImageDecoder::ImageRequest {
+ public:
+  explicit ClipboardImageDataDecoder(ClipboardExtensionHelper* owner)
+      : owner_(owner) {}
+
+  ~ClipboardImageDataDecoder() override { ImageDecoder::Cancel(this); }
+
+  bool has_request_pending() const { return has_request_pending_; }
+
+  void Start(const std::vector<char>& image_data, clipboard::ImageType type) {
+    DCHECK_CURRENTLY_ON(BrowserThread::UI);
+    std::string image_data_str(image_data.begin(), image_data.end());
+
+    ImageDecoder::ImageCodec codec = ImageDecoder::DEFAULT_CODEC;
+    switch (type) {
+      case clipboard::IMAGE_TYPE_PNG:
+        codec = ImageDecoder::ROBUST_PNG_CODEC;
+        break;
+      case clipboard::IMAGE_TYPE_JPEG:
+        codec = ImageDecoder::ROBUST_JPEG_CODEC;
+        break;
+      default:

[dcheng, 2017/01/04 19:45:23]

Nit: Remove this case, because the parameter validation should have failed. That
way, the compiler will also warn if this needs additional case statements in the
future.

[jennyz, 2017/01/04 23:05:31]

Done.

+        OnDecodeImageFailed();
+        break;
+    }
+
+    has_request_pending_ = true;
+    ImageDecoder::StartWithOptions(this, image_data_str, codec, true);
+  }
+
+  void Cancel() {
+    has_request_pending_ = false;
+    ImageDecoder::Cancel(this);
+    owner_->OnImageDecodeCancel();
+  }
+
+  void OnImageDecoded(const SkBitmap& decoded_image) override {
+    has_request_pending_ = false;
+    owner_->OnImageDecoded(decoded_image);
+  }
+
+  void OnDecodeImageFailed() override {
+    has_request_pending_ = false;
+    owner_->OnImageDecodeFailure();
+  }
+
+ private:
+  ClipboardExtensionHelper* owner_;  // Not owned.
+  bool has_request_pending_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(ClipboardImageDataDecoder);
+};
+
+ClipboardExtensionHelper::ClipboardExtensionHelper() {
+  clipboard_image_data_decoder_.reset(new ClipboardImageDataDecoder(this));
+}
+
+ClipboardExtensionHelper::~ClipboardExtensionHelper() {}
+
+void ClipboardExtensionHelper::DecodeAndSaveImageData(
+    const std::vector<char>& data,
+    clipboard::ImageType type,
+    const base::Closure& success_callback,
+    const base::Callback<void(const std::string&)>& error_callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  // If there is a previous image decoding request still running, cancel it
+  // first. We only need the most recent image save request be completed, since
+  // the clipboard will only store data set by the most recent request, which
+  // is consistent with the clipboard "paste" behavior.
+  if (clipboard_image_data_decoder_->has_request_pending())
+    clipboard_image_data_decoder_->Cancel();
+
+  image_save_success_callback_ = success_callback;
+  image_save_error_callback_ = error_callback;
+  clipboard_image_data_decoder_->Start(data, type);
+}
+
+void ClipboardExtensionHelper::OnImageDecodeFailure() {
+  base::ResetAndReturn(&image_save_error_callback_)
+      .Run("Image data decoding failed");
+}
+
+void ClipboardExtensionHelper::OnImageDecoded(const SkBitmap& bitmap) {
+  {
+    ui::ScopedClipboardWriter scw(ui::CLIPBOARD_TYPE_COPY_PASTE);
+    // Write the decoded image data to clipboard.
+    if (!bitmap.empty() && !bitmap.isNull())
+      scw.WriteImage(bitmap);
+  }
+  base::ResetAndReturn(&image_save_success_callback_).Run();
+}
+
+void ClipboardExtensionHelper::OnImageDecodeCancel() {
+  base::ResetAndReturn(&image_save_error_callback_).Run("Request canceled");
+}
+
+}  // namespace extensions