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// Copyright 2016 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.
#ifndef NotificationImageLoader_h
#define NotificationImageLoader_h
#include "core/loader/ThreadableLoader.h"
#include "core/loader/ThreadableLoaderClient.h"
#include "modules/ModulesExport.h"
#include "platform/SharedBuffer.h"
#include "platform/heap/Handle.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "wtf/Functional.h"
#include "wtf/RefPtr.h"
#include <memory>
namespace blink {
class ExecutionContext;
class KURL;
class ResourceError;
// Asynchronously downloads an image when given a url, decodes the loaded data,
// and passes the bitmap to the given callback.
class MODULES_EXPORT NotificationImageLoader final
: public GarbageCollectedFinalized<NotificationImageLoader>,
public ThreadableLoaderClient {
public:
// Type names are used in UMAs, so do not rename.
enum class Type { Image, Icon, Badge, ActionIcon };
// The bitmap may be empty if the request failed or the image data could not
// be decoded.
using ImageCallback = Function<void(const SkBitmap&)>;
explicit NotificationImageLoader(Type);
~NotificationImageLoader() override;
// Scales down |image| according to its type and returns result. If it is
// already small enough, |image| is returned unchanged.
static SkBitmap scaleDownIfNeeded(const SkBitmap& image, Type);
// Asynchronously downloads an image from the given url, decodes the loaded
// data, and passes the bitmap to the callback. Times out if the load takes
// too long and ImageCallback is invoked with an empty bitmap.
void start(ExecutionContext*, const KURL&, std::unique_ptr<ImageCallback>);
// Cancels the pending load, if there is one. The |m_imageCallback| will not
// be run.
void stop();
// ThreadableLoaderClient interface.
void didReceiveData(const char* data, unsigned length) override;
void didFinishLoading(unsigned long resourceIdentifier,
double finishTime) override;
void didFail(const ResourceError&) override;
void didFailRedirectCheck() override;
DEFINE_INLINE_TRACE() { visitor->trace(m_threadableLoader); }
private:
void runCallbackWithEmptyBitmap();
Type m_type;
bool m_stopped;
double m_startTime;
RefPtr<SharedBuffer> m_data;
std::unique_ptr<ImageCallback> m_imageCallback;
Member<ThreadableLoader> m_threadableLoader;
};
} // namespace blink
#endif // NotificationImageLoader_h
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