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// 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 core_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 core_api::extension_types::ImageFormat kDefaultFormat =
core_api::extension_types::IMAGE_FORMAT_JPEG;
const int kDefaultQuality = 90;
image_format_ = kDefaultFormat;
image_quality_ = kDefaultQuality;
if (image_details) {
if (image_details->format !=
core_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::ToCeiledSize(gfx::ScaleSize(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 core_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 core_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*>(vector_as_array(&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
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