/* 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_encoders_png_nsPNGEncoder_h
#define mozilla_image_encoders_png_nsPNGEncoder_h

#include <png.h>

#include "imgIEncoder.h"
#include "mozilla/Attributes.h"
#include "mozilla/ReentrantMonitor.h"
#include "mozilla/gfx/Types.h"
#include "nsCOMPtr.h"

#define NS_PNGENCODER_CID                     \
  {/* 38d1592e-b81e-432b-86f8-471878bbfe07 */ \
   0x38d1592e,                                \
   0xb81e,                                    \
   0x432b,                                    \
   {0x86, 0xf8, 0x47, 0x18, 0x78, 0xbb, 0xfe, 0x07}}

// Provides PNG encoding functionality. Use InitFromData() to do the
// encoding. See that function definition for encoding options.

class nsPNGEncoder final : public imgIEncoder {
  typedef mozilla::ReentrantMonitor ReentrantMonitor;

 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_IMGIENCODER
  NS_DECL_NSIINPUTSTREAM
  NS_DECL_NSIASYNCINPUTSTREAM

  nsPNGEncoder();

 protected:
  ~nsPNGEncoder();
  nsresult ParseOptions(const nsAString& aOptions, bool* useTransparency,
                        bool* skipFirstFrame, uint32_t* numAnimatedFrames,
                        uint32_t* numIterations, int* zlibLevel, int* filters,
                        uint32_t* frameDispose, uint32_t* frameBlend,
                        uint32_t* frameDelay, uint32_t* offsetX,
                        uint32_t* offsetY);
  void ConvertHostARGBRow(const uint8_t* aSrc, uint8_t* aDest,
                          uint32_t aPixelWidth, bool aUseTransparency);
  void StripAlpha(const uint8_t* aSrc, uint8_t* aDest, uint32_t aPixelWidth);
  static void WarningCallback(png_structp png_ptr, png_const_charp warning_msg);
  static void ErrorCallback(png_structp png_ptr, png_const_charp error_msg);
  static void WriteCallback(png_structp png, png_bytep data, png_size_t size);
  void NullOutImageBuffer();
  void NotifyListener();
  nsresult MaybeAddCustomMetadata(const nsACString& aRandomizationKey);

  png_struct* mPNG;
  png_info* mPNGinfo;

  bool mAddCustomMetadata;
  bool mIsAnimation;
  bool mFinished;

  uint32_t mBitDepth = 8;
  // For 10-bit and 12-bit input, which are encoded as 16-bit png because that
  // is the only option png supports with more than 8 bit depth, this records
  // the original bit depth so we can write an sBIT chunk. 0 otherwise.
  uint32_t mInputBitDepth = 0;
  bool mHasCICP = false;
  mozilla::gfx::CICP::ColourPrimaries mColourPrimaries =
      mozilla::gfx::CICP::CP_BT709;
  mozilla::gfx::CICP::TransferCharacteristics mTransferCharacteristics =
      mozilla::gfx::CICP::TC_SRGB;
  mozilla::gfx::CICP::MatrixCoefficients mMatrixCoefficients =
      mozilla::gfx::CICP::MC_IDENTITY;
  bool mFullRange = true;

  // image buffer
  uint8_t* mImageBuffer;
  uint32_t mImageBufferSize;
  uint32_t mImageBufferUsed;
  uint32_t mImageBufferHash;

  uint32_t mImageBufferReadPoint;

  nsCOMPtr<nsIInputStreamCallback> mCallback;
  nsCOMPtr<nsIEventTarget> mCallbackTarget;
  uint32_t mNotifyThreshold;

  // nsPNGEncoder is designed to allow one thread to pump data into it while
  // another reads from it.  We lock to ensure that the buffer remains
  // append-only while we read from it (that it is not realloced) and to
  // ensure that only one thread dispatches a callback for each call to
  // AsyncWait.
  ReentrantMonitor mReentrantMonitor MOZ_UNANNOTATED;
};
#endif  // mozilla_image_encoders_png_nsPNGEncoder_h
