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// Copyright 2014 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 "ui/snapshot/screenshot_grabber.h"
#include <climits>
#include <string>
#include "base/bind.h"
#include "base/callback.h"
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "base/task_runner.h"
#include "base/threading/sequenced_worker_pool.h"
#include "base/time/time.h"
#include "ui/gfx/image/image.h"
#include "ui/snapshot/snapshot.h"
#if defined(USE_AURA)
#include "ui/aura/window.h"
#endif
namespace ui {
namespace {
// The minimum interval between two screenshot commands. It has to be
// more than 1000 to prevent the conflict of filenames.
const int kScreenshotMinimumIntervalInMS = 1000;
using ShowNotificationCallback =
base::Callback<void(ScreenshotGrabberObserver::Result screenshot_result,
const base::FilePath& screenshot_path)>;
void SaveScreenshot(scoped_refptr<base::TaskRunner> ui_task_runner,
const ShowNotificationCallback& callback,
const base::FilePath& screenshot_path,
scoped_refptr<base::RefCountedBytes> png_data,
ScreenshotGrabberDelegate::FileResult result,
const base::FilePath& local_path) {
DCHECK(!base::MessageLoopForUI::IsCurrent());
DCHECK(!screenshot_path.empty());
// Convert FileResult into ScreenshotGrabberObserver::Result.
ScreenshotGrabberObserver::Result screenshot_result =
ScreenshotGrabberObserver::SCREENSHOT_SUCCESS;
switch (result) {
case ScreenshotGrabberDelegate::FILE_SUCCESS:
// Successfully got a local file to write to, write png data.
DCHECK_GT(static_cast<int>(png_data->size()), 0);
if (static_cast<size_t>(base::WriteFile(
local_path, reinterpret_cast<char*>(&(png_data->data()[0])),
static_cast<int>(png_data->size()))) != png_data->size()) {
LOG(ERROR) << "Failed to save to " << local_path.value();
screenshot_result =
ScreenshotGrabberObserver::SCREENSHOT_WRITE_FILE_FAILED;
}
break;
case ScreenshotGrabberDelegate::FILE_CHECK_DIR_FAILED:
screenshot_result =
ScreenshotGrabberObserver::SCREENSHOT_CHECK_DIR_FAILED;
break;
case ScreenshotGrabberDelegate::FILE_CREATE_DIR_FAILED:
screenshot_result =
ScreenshotGrabberObserver::SCREENSHOT_CREATE_DIR_FAILED;
break;
case ScreenshotGrabberDelegate::FILE_CREATE_FAILED:
screenshot_result =
ScreenshotGrabberObserver::SCREENSHOT_CREATE_FILE_FAILED;
break;
}
// Report the result on the UI thread.
ui_task_runner->PostTask(
FROM_HERE, base::Bind(callback, screenshot_result, screenshot_path));
}
void EnsureLocalDirectoryExists(
const base::FilePath& path,
ScreenshotGrabberDelegate::FileCallback callback) {
DCHECK(!base::MessageLoopForUI::IsCurrent());
DCHECK(!path.empty());
if (!base::CreateDirectory(path.DirName())) {
LOG(ERROR) << "Failed to ensure the existence of "
<< path.DirName().value();
callback.Run(ScreenshotGrabberDelegate::FILE_CREATE_DIR_FAILED, path);
return;
}
callback.Run(ScreenshotGrabberDelegate::FILE_SUCCESS, path);
}
} // namespace
void ScreenshotGrabberDelegate::PrepareFileAndRunOnBlockingPool(
const base::FilePath& path,
scoped_refptr<base::TaskRunner> blocking_task_runner,
const FileCallback& callback_on_blocking_pool) {
blocking_task_runner->PostTask(
FROM_HERE,
base::Bind(EnsureLocalDirectoryExists, path, callback_on_blocking_pool));
}
ScreenshotGrabber::ScreenshotGrabber(
ScreenshotGrabberDelegate* client,
scoped_refptr<base::TaskRunner> blocking_task_runner)
: client_(client),
blocking_task_runner_(blocking_task_runner),
factory_(this) {
}
ScreenshotGrabber::~ScreenshotGrabber() {
}
void ScreenshotGrabber::TakeScreenshot(gfx::NativeWindow window,
const gfx::Rect& rect,
const base::FilePath& screenshot_path) {
DCHECK(base::MessageLoopForUI::IsCurrent());
last_screenshot_timestamp_ = base::TimeTicks::Now();
bool is_partial = true;
// Window identifier is used to log a message on failure to capture a full
// screen (i.e. non partial) screenshot. The only time is_partial can be
// false, we will also have an identification string for the window.
std::string window_identifier;
#if defined(USE_AURA)
aura::Window* aura_window = static_cast<aura::Window*>(window);
is_partial = rect.size() != aura_window->bounds().size();
window_identifier = aura_window->GetBoundsInScreen().ToString();
#endif
ui::GrabWindowSnapshotAsync(
window, rect, blocking_task_runner_,
base::Bind(&ScreenshotGrabber::GrabWindowSnapshotAsyncCallback,
factory_.GetWeakPtr(), window_identifier, screenshot_path,
is_partial));
}
bool ScreenshotGrabber::CanTakeScreenshot() {
return last_screenshot_timestamp_.is_null() ||
base::TimeTicks::Now() - last_screenshot_timestamp_ >
base::TimeDelta::FromMilliseconds(kScreenshotMinimumIntervalInMS);
}
void ScreenshotGrabber::NotifyScreenshotCompleted(
ScreenshotGrabberObserver::Result screenshot_result,
const base::FilePath& screenshot_path) {
DCHECK(base::MessageLoopForUI::IsCurrent());
FOR_EACH_OBSERVER(ScreenshotGrabberObserver, observers_,
OnScreenshotCompleted(screenshot_result, screenshot_path));
}
void ScreenshotGrabber::AddObserver(ScreenshotGrabberObserver* observer) {
observers_.AddObserver(observer);
}
void ScreenshotGrabber::RemoveObserver(ScreenshotGrabberObserver* observer) {
observers_.RemoveObserver(observer);
}
bool ScreenshotGrabber::HasObserver(
const ScreenshotGrabberObserver* observer) const {
return observers_.HasObserver(observer);
}
void ScreenshotGrabber::GrabWindowSnapshotAsyncCallback(
const std::string& window_identifier,
base::FilePath screenshot_path,
bool is_partial,
scoped_refptr<base::RefCountedBytes> png_data) {
DCHECK(base::MessageLoopForUI::IsCurrent());
if (!png_data.get()) {
if (is_partial) {
LOG(ERROR) << "Failed to grab the window screenshot";
NotifyScreenshotCompleted(
ScreenshotGrabberObserver::SCREENSHOT_GRABWINDOW_PARTIAL_FAILED,
screenshot_path);
} else {
LOG(ERROR) << "Failed to grab the window screenshot for "
<< window_identifier;
NotifyScreenshotCompleted(
ScreenshotGrabberObserver::SCREENSHOT_GRABWINDOW_FULL_FAILED,
screenshot_path);
}
return;
}
ShowNotificationCallback notification_callback(base::Bind(
&ScreenshotGrabber::NotifyScreenshotCompleted, factory_.GetWeakPtr()));
client_->PrepareFileAndRunOnBlockingPool(
screenshot_path, blocking_task_runner_,
base::Bind(&SaveScreenshot, base::MessageLoop::current()->task_runner(),
notification_callback, screenshot_path, png_data));
}
} // namespace ui
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