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// 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/ui/ash/screenshot_taker.h"
#include <climits>
#include <string>
#include "ash/shell.h"
#include "ash/shell_delegate.h"
#include "ash/shell_window_ids.h"
#include "base/bind.h"
#include "base/file_path.h"
#include "base/file_util.h"
#include "base/logging.h"
#include "base/memory/ref_counted_memory.h"
#include "base/stringprintf.h"
#include "base/threading/sequenced_worker_pool.h"
#include "base/time.h"
#include "chrome/browser/download/download_prefs.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chrome/browser/ui/webui/screenshot_source.h"
#include "chrome/browser/ui/window_snapshot/window_snapshot.h"
#include "content/public/browser/browser_thread.h"
#include "ui/aura/root_window.h"
#include "ui/aura/window.h"
#if defined(OS_CHROMEOS)
#include "chrome/browser/chromeos/drive/drive_file_system_util.h"
#include "chrome/browser/chromeos/login/user_manager.h"
#endif
namespace {
// How opaque should the layer that we flash onscreen to provide visual
// feedback after the screenshot is taken be?
const float kVisualFeedbackLayerOpacity = 0.25f;
// How long should the visual feedback layer be displayed?
const int64 kVisualFeedbackLayerDisplayTimeMs = 100;
// The minimum interval between two screenshot commands. It has to be
// more than 1000 to prevent the conflict of filenames.
const int kScreenshotMinimumIntervalInMS = 1000;
void SaveScreenshotInternal(const base::FilePath& screenshot_path,
scoped_refptr<base::RefCountedBytes> png_data) {
DCHECK(content::BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread());
DCHECK(!screenshot_path.empty());
if (static_cast<size_t>(file_util::WriteFile(
screenshot_path,
reinterpret_cast<char*>(&(png_data->data()[0])),
png_data->size())) != png_data->size()) {
LOG(ERROR) << "Failed to save to " << screenshot_path.value();
}
}
void SaveScreenshot(const base::FilePath& screenshot_path,
scoped_refptr<base::RefCountedBytes> png_data) {
DCHECK(content::BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread());
DCHECK(!screenshot_path.empty());
if (!file_util::CreateDirectory(screenshot_path.DirName())) {
LOG(ERROR) << "Failed to ensure the existence of "
<< screenshot_path.DirName().value();
return;
}
SaveScreenshotInternal(screenshot_path, png_data);
}
// TODO(kinaba): crbug.com/140425, remove this ungly #ifdef dispatch.
#ifdef OS_CHROMEOS
void SaveScreenshotToDrive(scoped_refptr<base::RefCountedBytes> png_data,
drive::DriveFileError error,
const base::FilePath& local_path) {
if (error != drive::DRIVE_FILE_OK) {
LOG(ERROR) << "Failed to write screenshot image to Google Drive: " << error;
return;
}
SaveScreenshotInternal(local_path, png_data);
}
void EnsureDirectoryExistsCallback(
Profile* profile,
const base::FilePath& screenshot_path,
scoped_refptr<base::RefCountedBytes> png_data,
drive::DriveFileError error) {
// It is okay to fail with DRIVE_FILE_ERROR_EXISTS since anyway the directory
// of the target file exists.
if (error == drive::DRIVE_FILE_OK ||
error == drive::DRIVE_FILE_ERROR_EXISTS) {
drive::util::PrepareWritableFileAndRun(
profile,
screenshot_path,
base::Bind(&SaveScreenshotToDrive, png_data));
} else {
LOG(ERROR) << "Failed to ensure the existence of the specified directory "
<< "in Google Drive: " << error;
}
}
void PostSaveScreenshotTask(const base::FilePath& screenshot_path,
scoped_refptr<base::RefCountedBytes> png_data) {
if (drive::util::IsUnderDriveMountPoint(screenshot_path)) {
Profile* profile = ProfileManager::GetDefaultProfileOrOffTheRecord();
if (profile) {
drive::util::EnsureDirectoryExists(
profile,
screenshot_path.DirName(),
base::Bind(&EnsureDirectoryExistsCallback,
profile,
screenshot_path,
png_data));
}
} else {
content::BrowserThread::GetBlockingPool()->PostTask(
FROM_HERE, base::Bind(&SaveScreenshot, screenshot_path, png_data));
}
}
#else
void PostSaveScreenshotTask(const base::FilePath& screenshot_path,
scoped_refptr<base::RefCountedBytes> png_data) {
content::BrowserThread::GetBlockingPool()->PostTask(
FROM_HERE, base::Bind(&SaveScreenshot, screenshot_path, png_data));
}
#endif
bool GrabWindowSnapshot(aura::Window* window,
const gfx::Rect& snapshot_bounds,
std::vector<unsigned char>* png_data) {
#if defined(OS_LINUX)
// chrome::GrabWindowSnapshotForUser checks this too, but
// RootWindow::GrabSnapshot does not.
if (ScreenshotSource::AreScreenshotsDisabled())
return false;
// We use XGetImage() for Linux/ChromeOS for performance reasons.
// See crbug.com/119492
// TODO(mukai): remove this when the performance issue has been fixed.
if (window->GetRootWindow()->GrabSnapshot(snapshot_bounds, png_data))
return true;
#endif // OS_LINUX
return chrome::GrabWindowSnapshotForUser(window, png_data, snapshot_bounds);
}
} // namespace
ScreenshotTaker::ScreenshotTaker() {
}
ScreenshotTaker::~ScreenshotTaker() {
}
void ScreenshotTaker::HandleTakeScreenshotForAllRootWindows() {
base::FilePath screenshot_directory;
if (!ScreenshotSource::GetScreenshotDirectory(&screenshot_directory))
return;
std::string screenshot_basename =
ScreenshotSource::GetScreenshotBaseFilename();
ash::Shell::RootWindowList root_windows = ash::Shell::GetAllRootWindows();
// Reorder root_windows to take the primary root window's snapshot at first.
aura::RootWindow* primary_root = ash::Shell::GetPrimaryRootWindow();
if (*(root_windows.begin()) != primary_root) {
root_windows.erase(std::find(
root_windows.begin(), root_windows.end(), primary_root));
root_windows.insert(root_windows.begin(), primary_root);
}
for (size_t i = 0; i < root_windows.size(); ++i) {
aura::RootWindow* root_window = root_windows[i];
scoped_refptr<base::RefCountedBytes> png_data(new base::RefCountedBytes);
std::string basename = screenshot_basename;
gfx::Rect rect = root_window->bounds();
if (root_windows.size() > 1)
basename += base::StringPrintf(" - Display %d", static_cast<int>(i + 1));
if (GrabWindowSnapshot(root_window, rect, &png_data->data())) {
DisplayVisualFeedback(rect);
PostSaveScreenshotTask(
screenshot_directory.AppendASCII(basename + ".png"), png_data);
} else {
LOG(ERROR) << "Failed to grab the window screenshot for " << i;
}
}
last_screenshot_timestamp_ = base::Time::Now();
}
void ScreenshotTaker::HandleTakePartialScreenshot(
aura::Window* window, const gfx::Rect& rect) {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
base::FilePath screenshot_directory;
if (!ScreenshotSource::GetScreenshotDirectory(&screenshot_directory))
return;
scoped_refptr<base::RefCountedBytes> png_data(new base::RefCountedBytes);
if (GrabWindowSnapshot(window, rect, &png_data->data())) {
last_screenshot_timestamp_ = base::Time::Now();
DisplayVisualFeedback(rect);
PostSaveScreenshotTask(
screenshot_directory.AppendASCII(
ScreenshotSource::GetScreenshotBaseFilename() + ".png"),
png_data);
} else {
LOG(ERROR) << "Failed to grab the window screenshot";
}
}
bool ScreenshotTaker::CanTakeScreenshot() {
return last_screenshot_timestamp_.is_null() ||
base::Time::Now() - last_screenshot_timestamp_ >
base::TimeDelta::FromMilliseconds(
kScreenshotMinimumIntervalInMS);
}
void ScreenshotTaker::CloseVisualFeedbackLayer() {
visual_feedback_layer_.reset();
}
void ScreenshotTaker::DisplayVisualFeedback(const gfx::Rect& rect) {
visual_feedback_layer_.reset(new ui::Layer(ui::LAYER_SOLID_COLOR));
visual_feedback_layer_->SetColor(SK_ColorWHITE);
visual_feedback_layer_->SetOpacity(kVisualFeedbackLayerOpacity);
visual_feedback_layer_->SetBounds(rect);
ui::Layer* parent = ash::Shell::GetContainer(
ash::Shell::GetActiveRootWindow(),
ash::internal::kShellWindowId_OverlayContainer)->layer();
parent->Add(visual_feedback_layer_.get());
visual_feedback_layer_->SetVisible(true);
MessageLoopForUI::current()->PostDelayedTask(
FROM_HERE,
base::Bind(&ScreenshotTaker::CloseVisualFeedbackLayer,
base::Unretained(this)),
base::TimeDelta::FromMilliseconds(kVisualFeedbackLayerDisplayTimeMs));
}
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