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// Copyright 2019 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 "third_party/blink/renderer/core/loader/threaded_icon_loader.h"
#include <algorithm>
#include "base/cxx17_backports.h"
#include "base/metrics/histogram_macros.h"
#include "skia/ext/image_operations.h"
#include "third_party/blink/public/mojom/fetch/fetch_api_request.mojom-blink.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/platform/image-decoders/image_decoder.h"
#include "third_party/blink/renderer/platform/image-decoders/image_frame.h"
#include "third_party/blink/renderer/platform/image-decoders/segment_reader.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_loader_options.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_request.h"
#include "third_party/blink/renderer/platform/scheduler/public/post_cross_thread_task.h"
#include "third_party/blink/renderer/platform/scheduler/public/thread.h"
#include "third_party/blink/renderer/platform/scheduler/public/worker_pool.h"
#include "third_party/blink/renderer/platform/weborigin/kurl.h"
#include "third_party/blink/renderer/platform/wtf/cross_thread_functional.h"
namespace blink {
void ThreadedIconLoader::Start(
ExecutionContext* execution_context,
const ResourceRequestHead& resource_request,
const absl::optional<gfx::Size>& resize_dimensions,
IconCallback callback) {
DCHECK(!stopped_);
DCHECK(resource_request.Url().IsValid());
DCHECK_EQ(resource_request.GetRequestContext(),
mojom::blink::RequestContextType::IMAGE);
DCHECK(!icon_callback_);
icon_callback_ = std::move(callback);
resize_dimensions_ = resize_dimensions;
ResourceLoaderOptions resource_loader_options(
execution_context->GetCurrentWorld());
if (execution_context->IsWorkerGlobalScope())
resource_loader_options.request_initiator_context = kWorkerContext;
threadable_loader_ = MakeGarbageCollected<ThreadableLoader>(
*execution_context, this, resource_loader_options);
threadable_loader_->SetTimeout(resource_request.TimeoutInterval());
threadable_loader_->Start(ResourceRequest(resource_request));
start_time_ = base::TimeTicks::Now();
}
void ThreadedIconLoader::Stop() {
stopped_ = true;
if (threadable_loader_) {
threadable_loader_->Cancel();
threadable_loader_ = nullptr;
}
}
void ThreadedIconLoader::DidReceiveData(const char* data, unsigned length) {
if (!data_)
data_ = SharedBuffer::Create();
data_->Append(data, length);
}
void ThreadedIconLoader::DidFinishLoading(uint64_t resource_identifier) {
if (stopped_)
return;
if (!data_) {
std::move(icon_callback_).Run(SkBitmap(), -1);
return;
}
UMA_HISTOGRAM_MEDIUM_TIMES("Blink.ThreadedIconLoader.LoadTime",
base::TimeTicks::Now() - start_time_);
scoped_refptr<base::SingleThreadTaskRunner> task_runner =
Thread::Current()->GetTaskRunner();
worker_pool::PostTask(
FROM_HERE,
CrossThreadBindOnce(
&ThreadedIconLoader::DecodeAndResizeImageOnBackgroundThread,
WrapCrossThreadPersistent(this), std::move(task_runner),
SegmentReader::CreateFromSharedBuffer(std::move(data_))));
}
void ThreadedIconLoader::DecodeAndResizeImageOnBackgroundThread(
scoped_refptr<base::SingleThreadTaskRunner> task_runner,
scoped_refptr<SegmentReader> data) {
DCHECK(task_runner);
DCHECK(data);
auto notify_complete = [&](double refactor_scale) {
PostCrossThreadTask(
*task_runner, FROM_HERE,
CrossThreadBindOnce(&ThreadedIconLoader::OnBackgroundTaskComplete,
WrapCrossThreadPersistent(this), refactor_scale));
};
std::unique_ptr<ImageDecoder> decoder = ImageDecoder::Create(
std::move(data), /* data_complete= */ true,
ImageDecoder::kAlphaPremultiplied, ImageDecoder::kDefaultBitDepth,
ColorBehavior::TransformToSRGB());
if (!decoder) {
notify_complete(-1.0);
return;
}
ImageFrame* image_frame = decoder->DecodeFrameBufferAtIndex(0);
if (!image_frame) {
notify_complete(-1.0);
return;
}
decoded_icon_ = image_frame->Bitmap();
if (!resize_dimensions_ || resize_dimensions_->IsEmpty()) {
notify_complete(1.0);
return;
}
// If the icon is larger than |resize_dimensions_| permits, we need to resize
// it as well. This can be done synchronously given that we're on a
// background thread already.
double scale = std::min(
static_cast<double>(resize_dimensions_->width()) / decoded_icon_.width(),
static_cast<double>(resize_dimensions_->height()) /
decoded_icon_.height());
if (scale >= 1.0) {
notify_complete(1.0);
return;
}
int resized_width =
base::clamp(static_cast<int>(scale * decoded_icon_.width()), 1,
resize_dimensions_->width());
int resized_height =
base::clamp(static_cast<int>(scale * decoded_icon_.height()), 1,
resize_dimensions_->height());
// Use the RESIZE_GOOD quality allowing the implementation to pick an
// appropriate method for the resize. Can be increased to RESIZE_BETTER
// or RESIZE_BEST if the quality looks poor.
SkBitmap resized_icon = skia::ImageOperations::Resize(
decoded_icon_, skia::ImageOperations::RESIZE_GOOD, resized_width,
resized_height);
if (resized_icon.isNull()) {
notify_complete(1.0);
return;
}
decoded_icon_ = std::move(resized_icon);
notify_complete(scale);
}
void ThreadedIconLoader::OnBackgroundTaskComplete(double resize_scale) {
if (stopped_)
return;
std::move(icon_callback_).Run(std::move(decoded_icon_), resize_scale);
}
void ThreadedIconLoader::DidFail(uint64_t, const ResourceError& error) {
if (stopped_)
return;
std::move(icon_callback_).Run(SkBitmap(), -1);
}
void ThreadedIconLoader::DidFailRedirectCheck(uint64_t) {
if (stopped_)
return;
std::move(icon_callback_).Run(SkBitmap(), -1);
}
void ThreadedIconLoader::Trace(Visitor* visitor) const {
visitor->Trace(threadable_loader_);
ThreadableLoaderClient::Trace(visitor);
}
} // namespace blink
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