nsJXLDecoder.h - mozsearch

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/*

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_image_decoders_nsJXLDecoder_h

#define mozilla_image_decoders_nsJXLDecoder_h

#include "Decoder.h"

#include "StreamingLexer.h"

#include "mozilla/Vector.h"

#include "mozilla/image/jxl_decoder_ffi.h"

namespace mozilla::image {

struct JxlDecoderDeleter {

  void operator()(JxlApiDecoder* ptr) { jxl_decoder_destroy(ptr); }

};

class nsJXLDecoder final : public Decoder {

 public:

  ~nsJXLDecoder() override;

  DecoderType GetType() const override { return DecoderType::JXL; }

 protected:

  nsresult InitInternal() override;

  LexerResult DoDecode(SourceBufferIterator& aIterator,

                       IResumable* aOnResume) override;

 private:

  friend class DecoderFactory;

  explicit nsJXLDecoder(RasterImage* aImage);

  std::unique_ptr<JxlApiDecoder, JxlDecoderDeleter> mDecoder;

  enum class State { JXL_DATA, DRAIN_FRAMES, FINISHED_JXL_DATA };

  enum class FrameOutputResult {

    BufferAllocated,

    FrameAdvanced,

    DecodeComplete,

    NoOutput,

    Error

};

  JxlDecoderStatus ProcessInput(const uint8_t** aData, size_t* aLength);

  nsresult ProcessFrame(Vector<uint8_t>& aPixelBuffer);

  FrameOutputResult HandleFrameOutput();

  LexerTransition<State> ReadJXLData(const char* aData, size_t aLength);

  LexerTransition<State> DrainFrames();

  LexerTransition<State> FinishedJXLData();

  StreamingLexer<State> mLexer;

  uint32_t mFrameIndex = 0;

  Vector<uint8_t> mPixelBuffer;

};

}  // namespace mozilla::image

#endif  // mozilla_image_decoders_nsJXLDecoder_h