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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_DISPLAY_WIN_COLOR_PROFILE_READER_H_
#define UI_DISPLAY_WIN_COLOR_PROFILE_READER_H_
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "ui/display/display_export.h"
#include "ui/gfx/icc_profile.h"
#include <map>
#include <string>
namespace display {
namespace win {
// Monitor ICC profiles are stored in the filesystem, and a blocking read from
// file is required to read them. This is expensive and shouldn't be done on the
// main thread, so this class manages asynchronously doing these readings and
// calling back into its client when the profiles are noticed to have changed.
class DISPLAY_EXPORT ColorProfileReader {
public:
class Client {
public:
virtual void OnColorProfilesChanged() = 0;
};
ColorProfileReader(Client* client);
~ColorProfileReader();
// Check to see if the screen profile filenames have changed. If so, spawn a
// task to update them. When the task has completed, this will call the
// client's OnColorProfileReaderChanged on the main thread.
void UpdateIfNeeded();
// Look up the color space for a given device name. If the device's color
// profile has not yet been read, this will return sRGB (which is what the
// file on disk will say most of the time).
gfx::ColorSpace GetDisplayColorSpace(int64_t id) const;
private:
using DisplayIdToPathMap = std::map<int64_t, std::wstring>;
using DisplayIdToDataMap = std::map<int64_t, std::string>;
// Enumerate displays and return a map to their ICC profile path. This
// needs to be run off of the main thread.
static ColorProfileReader::DisplayIdToPathMap
BuildDisplayIdToPathMapOnBackgroundThread();
// Called on the main thread when the device paths have been retrieved
void BuildDisplayIdToPathMapCompleted(
DisplayIdToPathMap new_display_id_to_path_map);
// Do the actual reading from the filesystem. This needs to be run off of the
// main thread.
static DisplayIdToDataMap ReadProfilesOnBackgroundThread(
DisplayIdToPathMap new_display_id_to_path_map);
// Called on the main thread when the read has completed.
void ReadProfilesCompleted(DisplayIdToDataMap display_id_to_data_map);
const raw_ptr<Client> client_ = nullptr;
bool update_in_flight_ = false;
DisplayIdToPathMap display_id_to_path_map_;
std::map<int64_t, gfx::ICCProfile> display_id_to_profile_map_;
base::WeakPtrFactory<ColorProfileReader> weak_factory_{this};
};
} // namespace win
} // namespace display
#endif // UI_DISPLAY_WIN_COLOR_PROFILE_READER_H_
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