Revert of Implement webview.captureVisibleRegion()

extensions/browser/api/capture_web_contents_function.cc

Index: extensions/browser/api/capture_web_contents_function.cc
diff --git a/extensions/browser/api/capture_web_contents_function.cc b/extensions/browser/api/capture_web_contents_function.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e10842d8aee0aa103031261e8dec0ca9045f5479
--- /dev/null
+++ b/extensions/browser/api/capture_web_contents_function.cc
@@ -0,0 +1,150 @@
+// Copyright 2013 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 "extensions/browser/api/capture_web_contents_function.h"
+
+#include "base/base64.h"
+#include "base/strings/stringprintf.h"
+#include "content/public/browser/render_widget_host.h"
+#include "content/public/browser/render_widget_host_view.h"
+#include "content/public/browser/web_contents.h"
+#include "extensions/browser/extension_function.h"
+#include "extensions/common/constants.h"
+#include "ui/gfx/codec/jpeg_codec.h"
+#include "ui/gfx/codec/png_codec.h"
+#include "ui/gfx/display.h"
+#include "ui/gfx/geometry/size_conversions.h"
+#include "ui/gfx/screen.h"
+
+using content::RenderWidgetHost;
+using content::RenderWidgetHostView;
+using content::WebContents;
+
+namespace extensions {
+
+using api::extension_types::ImageDetails;
+
+bool CaptureWebContentsFunction::HasPermission() {
+  return true;
+}
+
+bool CaptureWebContentsFunction::RunAsync() {
+  EXTENSION_FUNCTION_VALIDATE(args_);
+
+  context_id_ = extension_misc::kCurrentWindowId;
+  args_->GetInteger(0, &context_id_);
+
+  scoped_ptr<ImageDetails> image_details;
+  if (args_->GetSize() > 1) {
+    base::Value* spec = NULL;
+    EXTENSION_FUNCTION_VALIDATE(args_->Get(1, &spec) && spec);
+    image_details = ImageDetails::FromValue(*spec);
+  }
+
+  if (!IsScreenshotEnabled())
+    return false;
+
+  WebContents* contents = GetWebContentsForID(context_id_);
+  if (!contents)
+    return false;
+
+  // The default format and quality setting used when encoding jpegs.
+  const api::extension_types::ImageFormat kDefaultFormat =
+      api::extension_types::IMAGE_FORMAT_JPEG;
+  const int kDefaultQuality = 90;
+
+  image_format_ = kDefaultFormat;
+  image_quality_ = kDefaultQuality;
+
+  if (image_details) {
+    if (image_details->format != api::extension_types::IMAGE_FORMAT_NONE)
+      image_format_ = image_details->format;
+    if (image_details->quality.get())
+      image_quality_ = *image_details->quality;
+  }
+
+  // TODO(miu): Account for fullscreen render widget?  http://crbug.com/419878
+  RenderWidgetHostView* const view = contents->GetRenderWidgetHostView();
+  RenderWidgetHost* const host = view ? view->GetRenderWidgetHost() : nullptr;
+  if (!view || !host) {
+    OnCaptureFailure(FAILURE_REASON_VIEW_INVISIBLE);
+    return false;
+  }
+
+  // By default, the requested bitmap size is the view size in screen
+  // coordinates.  However, if there's more pixel detail available on the
+  // current system, increase the requested bitmap size to capture it all.
+  const gfx::Size view_size = view->GetViewBounds().size();
+  gfx::Size bitmap_size = view_size;
+  const gfx::NativeView native_view = view->GetNativeView();
+  gfx::Screen* const screen = gfx::Screen::GetScreenFor(native_view);
+  const float scale =
+      screen->GetDisplayNearestWindow(native_view).device_scale_factor();
+  if (scale > 1.0f)
+    bitmap_size = gfx::ScaleToCeiledSize(view_size, scale);
+
+  host->CopyFromBackingStore(
+      gfx::Rect(view_size),
+      bitmap_size,
+      base::Bind(&CaptureWebContentsFunction::CopyFromBackingStoreComplete,
+                 this),
+      kN32_SkColorType);
+  return true;
+}
+
+void CaptureWebContentsFunction::CopyFromBackingStoreComplete(
+    const SkBitmap& bitmap,
+    content::ReadbackResponse response) {
+  if (response == content::READBACK_SUCCESS) {
+    OnCaptureSuccess(bitmap);
+    return;
+  }
+  OnCaptureFailure(FAILURE_REASON_UNKNOWN);
+}
+
+void CaptureWebContentsFunction::OnCaptureSuccess(const SkBitmap& bitmap) {
+  std::vector<unsigned char> data;
+  SkAutoLockPixels screen_capture_lock(bitmap);
+  bool encoded = false;
+  std::string mime_type;
+  switch (image_format_) {
+    case api::extension_types::IMAGE_FORMAT_JPEG:
+      encoded = gfx::JPEGCodec::Encode(
+          reinterpret_cast<unsigned char*>(bitmap.getAddr32(0, 0)),
+          gfx::JPEGCodec::FORMAT_SkBitmap,
+          bitmap.width(),
+          bitmap.height(),
+          static_cast<int>(bitmap.rowBytes()),
+          image_quality_,
+          &data);
+      mime_type = kMimeTypeJpeg;
+      break;
+    case api::extension_types::IMAGE_FORMAT_PNG:
+      encoded =
+          gfx::PNGCodec::EncodeBGRASkBitmap(bitmap,
+                                            true,  // Discard transparency.
+                                            &data);
+      mime_type = kMimeTypePng;
+      break;
+    default:
+      NOTREACHED() << "Invalid image format.";
+  }
+
+  if (!encoded) {
+    OnCaptureFailure(FAILURE_REASON_ENCODING_FAILED);
+    return;
+  }
+
+  std::string base64_result;
+  base::StringPiece stream_as_string(reinterpret_cast<const char*>(data.data()),
+                                     data.size());
+
+  base::Base64Encode(stream_as_string, &base64_result);
+  base64_result.insert(
+      0, base::StringPrintf("data:%s;base64,", mime_type.c_str()));
+  SetResult(new base::StringValue(base64_result));
+  SendResponse(true);
+}
+
+}  // namespace extensions