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// Copyright (c) the JPEG XL Project 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 LIB_JXL_RENDER_PIPELINE_RENDER_PIPELINE_H_
#define LIB_JXL_RENDER_PIPELINE_RENDER_PIPELINE_H_
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <utility>
#include <vector>
#include "lib/jxl/base/rect.h"
#include "lib/jxl/base/status.h"
#include "lib/jxl/frame_dimensions.h"
#include "lib/jxl/image.h"
#include "lib/jxl/render_pipeline/render_pipeline_stage.h"
namespace jxl {
// Interface to provide input to the rendering pipeline. When this object is
// destroyed, all the data in the provided ImageF's Rects must have been
// initialized.
class RenderPipelineInput {
public:
RenderPipelineInput(const RenderPipelineInput&) = delete;
RenderPipelineInput(RenderPipelineInput&& other) noexcept {
*this = std::move(other);
}
RenderPipelineInput& operator=(RenderPipelineInput&& other) noexcept {
pipeline_ = other.pipeline_;
group_id_ = other.group_id_;
thread_id_ = other.thread_id_;
buffers_ = std::move(other.buffers_);
other.pipeline_ = nullptr;
return *this;
}
RenderPipelineInput() = default;
Status Done();
const std::pair<ImageF*, Rect>& GetBuffer(size_t c) const {
JXL_ASSERT(c < buffers_.size());
return buffers_[c];
}
private:
RenderPipeline* pipeline_ = nullptr;
size_t group_id_;
size_t thread_id_;
std::vector<std::pair<ImageF*, Rect>> buffers_;
friend class RenderPipeline;
};
class RenderPipeline {
public:
class Builder {
public:
explicit Builder(size_t num_c) : num_c_(num_c) { JXL_ASSERT(num_c > 0); }
// Adds a stage to the pipeline. Must be called at least once; the last
// added stage cannot have kInOut channels.
void AddStage(std::unique_ptr<RenderPipelineStage> stage);
// Enables using the simple (i.e. non-memory-efficient) implementation of
// the pipeline.
void UseSimpleImplementation() { use_simple_implementation_ = true; }
// Finalizes setup of the pipeline. Shifts for all channels should be 0 at
// this point.
StatusOr<std::unique_ptr<RenderPipeline>> Finalize(
FrameDimensions frame_dimensions) &&;
private:
std::vector<std::unique_ptr<RenderPipelineStage>> stages_;
size_t num_c_;
bool use_simple_implementation_ = false;
};
friend class Builder;
virtual ~RenderPipeline() = default;
Status IsInitialized() const {
for (const auto& stage : stages_) {
JXL_RETURN_IF_ERROR(stage->IsInitialized());
}
return true;
}
// Allocates storage to run with `num` threads. If `use_group_ids` is true,
// storage is allocated for each group, not each thread. The behaviour is
// undefined if calling this function multiple times with a different value
// for `use_group_ids`.
Status PrepareForThreads(size_t num, bool use_group_ids);
// Retrieves a buffer where input data should be stored by the callee. When
// input has been provided for all buffers, the pipeline will complete its
// processing. This method may be called multiple times concurrently from
// different threads, provided that a different `thread_id` is given.
RenderPipelineInput GetInputBuffers(size_t group_id, size_t thread_id);
size_t PassesWithAllInput() const {
return *std::min_element(group_completed_passes_.begin(),
group_completed_passes_.end());
}
virtual void ClearDone(size_t i) {}
protected:
std::vector<std::unique_ptr<RenderPipelineStage>> stages_;
// Shifts for every channel at the input of each stage.
std::vector<std::vector<std::pair<size_t, size_t>>> channel_shifts_;
// Amount of (cumulative) padding required by each stage and channel, in
// either direction.
std::vector<std::vector<std::pair<size_t, size_t>>> padding_;
FrameDimensions frame_dimensions_;
std::vector<uint8_t> group_completed_passes_;
friend class RenderPipelineInput;
private:
Status InputReady(size_t group_id, size_t thread_id,
const std::vector<std::pair<ImageF*, Rect>>& buffers);
virtual std::vector<std::pair<ImageF*, Rect>> PrepareBuffers(
size_t group_id, size_t thread_id) = 0;
virtual Status ProcessBuffers(size_t group_id, size_t thread_id) = 0;
// Note that this method may be called multiple times with different (or
// equal) `num`.
virtual Status PrepareForThreadsInternal(size_t num, bool use_group_ids) = 0;
// Called once frame dimensions and stages are known.
virtual Status Init() { return true; }
};
} // namespace jxl
#endif // LIB_JXL_RENDER_PIPELINE_RENDER_PIPELINE_H_
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