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// Copyright 2018 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 MEDIA_GPU_CHROMEOS_IMAGE_PROCESSOR_FACTORY_H_
#define MEDIA_GPU_CHROMEOS_IMAGE_PROCESSOR_FACTORY_H_
#include <stdint.h>
#include <memory>
#include <vector>
#include "base/callback_forward.h"
#include "base/macros.h"
#include "media/gpu/chromeos/fourcc.h"
#include "media/gpu/chromeos/image_processor.h"
#include "media/gpu/media_gpu_export.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "ui/gfx/geometry/size.h"
namespace media {
class MEDIA_GPU_EXPORT ImageProcessorFactory {
public:
// Callback to pick a valid format from the given |candidates| formats giving
// preference to |preferred_fourcc| if provided.
using PickFormatCB = base::RepeatingCallback<absl::optional<Fourcc>(
const std::vector<Fourcc>& /* candidates */,
absl::optional<Fourcc> /* preferred_fourcc */)>;
// Factory method to create ImageProcessor.
// Given input and output PortConfig, it tries to find out the most suitable
// ImageProcessor to be used for the current platform.
//
// For |preferred_output_modes|, it tries instantiate an ImageProcessor class
// with an output mode in sequence. With ImageProcessor subclass and output
// mode selected, the subclass' factory method will pick the first supported
// input and output storage type from input and output PortConfig,
// respectively. It has an assumption that the selection of output mode is
// independent from the selection of output storage type.
//
// TODO(crbug.com/907767): Remove |preferred_output_modes| once ImageProcessor
// only accepts IMPORT output mode.
//
// Args:
// input_config: input PortConfig.
// output_config: output PortConfig.
// preferred_output_modes: list of preferred output modes.
// num_buffers: number of input and output buffers.
// error_cb: Callback when error occurs.
//
// Returns:
// Most suitable ImageProcessor instance. nullptr if no ImageProcessor
// is available for given parameters on current platform.
static std::unique_ptr<ImageProcessor> Create(
const ImageProcessor::PortConfig& input_config,
const ImageProcessor::PortConfig& output_config,
const std::vector<ImageProcessor::OutputMode>& preferred_output_modes,
size_t num_buffers,
VideoRotation relative_rotation,
scoped_refptr<base::SequencedTaskRunner> client_task_runner,
ImageProcessor::ErrorCB error_cb);
// Factory method to create an ImageProcessor.
// Unlike Create(), the caller passes a list of supported inputs,
// |input_candidates|. It also passes the |input_visible_rect| and the desired
// |output_size|. |out_format_picker| allows us to negotiate the output
// format: we'll call it with a list of supported formats and (possibly) a
// preferred one and the callback picks one. With the rest of the parameters
// the factory can instantiate a suitable ImageProcessor. Returns nullptr if
// an ImageProcessor can't be created.
static std::unique_ptr<ImageProcessor> CreateWithInputCandidates(
const std::vector<std::pair<Fourcc, gfx::Size>>& input_candidates,
const gfx::Rect& input_visible_rect,
const gfx::Size& output_size,
size_t num_buffers,
scoped_refptr<base::SequencedTaskRunner> client_task_runner,
PickFormatCB out_format_picker,
ImageProcessor::ErrorCB error_cb);
DISALLOW_IMPLICIT_CONSTRUCTORS(ImageProcessorFactory);
};
} // namespace media
#endif // MEDIA_GPU_CHROMEOS_IMAGE_PROCESSOR_FACTORY_H_
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