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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 "ui/snapshot/snapshot.h"
#include <utility>
#include "base/bind.h"
#include "base/callback.h"
#include "base/memory/ptr_util.h"
#include "base/task_runner_util.h"
#include "cc/output/copy_output_request.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/aura/window.h"
#include "ui/aura/window_tracker.h"
#include "ui/compositor/compositor.h"
#include "ui/compositor/dip_util.h"
#include "ui/compositor/layer.h"
#include "ui/snapshot/snapshot_async.h"
namespace ui {
bool GrabViewSnapshot(gfx::NativeView view,
const gfx::Rect& snapshot_bounds,
gfx::Image* image) {
return GrabWindowSnapshot(view, snapshot_bounds, image);
}
bool GrabWindowSnapshot(gfx::NativeWindow window,
const gfx::Rect& snapshot_bounds,
gfx::Image* image) {
// Not supported in Aura. Callers should fall back to the async version.
return false;
}
static void MakeAsyncCopyRequest(
gfx::NativeWindow window,
const gfx::Rect& source_rect,
const cc::CopyOutputRequest::CopyOutputRequestCallback& callback) {
std::unique_ptr<cc::CopyOutputRequest> request =
cc::CopyOutputRequest::CreateBitmapRequest(callback);
request->set_area(source_rect);
window->layer()->RequestCopyOfOutput(std::move(request));
}
static void FinishedAsyncCopyRequest(
std::unique_ptr<aura::WindowTracker> tracker,
const gfx::Rect& source_rect,
const cc::CopyOutputRequest::CopyOutputRequestCallback& callback,
int retry_count,
std::unique_ptr<cc::CopyOutputResult> result) {
static const int kMaxRetries = 5;
// Retry the copy request if the previous one failed for some reason.
if (!tracker->windows().empty() && (retry_count < kMaxRetries) &&
result->IsEmpty()) {
// Look up window before calling MakeAsyncRequest. Otherwise, due
// to undefined (favorably right to left) argument evaluation
// order, the tracker might have been passed and set to NULL
// before the window is looked up which results in a NULL pointer
// dereference.
gfx::NativeWindow window = tracker->windows()[0];
MakeAsyncCopyRequest(
window, source_rect,
base::Bind(&FinishedAsyncCopyRequest, base::Passed(&tracker),
source_rect, callback, retry_count + 1));
return;
}
callback.Run(std::move(result));
}
static void MakeInitialAsyncCopyRequest(
gfx::NativeWindow window,
const gfx::Rect& source_rect,
const cc::CopyOutputRequest::CopyOutputRequestCallback& callback) {
auto tracker = base::MakeUnique<aura::WindowTracker>();
tracker->Add(window);
MakeAsyncCopyRequest(
window, source_rect,
base::Bind(&FinishedAsyncCopyRequest, base::Passed(&tracker), source_rect,
callback, 0));
}
void GrabWindowSnapshotAndScaleAsync(
gfx::NativeWindow window,
const gfx::Rect& source_rect,
const gfx::Size& target_size,
scoped_refptr<base::TaskRunner> background_task_runner,
const GrabWindowSnapshotAsyncCallback& callback) {
MakeInitialAsyncCopyRequest(
window, source_rect,
base::Bind(&SnapshotAsync::ScaleCopyOutputResult, callback, target_size,
background_task_runner));
}
void GrabWindowSnapshotAsync(gfx::NativeWindow window,
const gfx::Rect& source_rect,
const GrabWindowSnapshotAsyncCallback& callback) {
MakeInitialAsyncCopyRequest(
window, source_rect,
base::Bind(&SnapshotAsync::RunCallbackWithCopyOutputResult, callback));
}
void GrabViewSnapshotAsync(gfx::NativeView view,
const gfx::Rect& source_rect,
const GrabWindowSnapshotAsyncCallback& callback) {
GrabWindowSnapshotAsync(view, source_rect, callback);
}
} // namespace ui
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