core/fxcodec/jpeg/jpegmodule.h

// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#ifndef CORE_FXCODEC_JPEG_JPEGMODULE_H_
#define CORE_FXCODEC_JPEG_JPEGMODULE_H_

#include <memory>

#include "build/build_config.h"
#include "third_party/base/optional.h"
#include "third_party/base/span.h"

#if defined(OS_WIN)
#include "core/fxcrt/retain_ptr.h"
#endif

#ifdef PDF_ENABLE_XFA
#include <csetjmp>

#include "core/fxcodec/progressive_decoder_iface.h"
#endif

class CFX_DIBBase;

namespace fxcodec {

class CFX_DIBAttribute;
class ScanlineDecoder;

class JpegModule {
 public:
  struct JpegImageInfo {
    int width;
    int height;
    int num_components;
    int bits_per_components;
    bool color_transform;
  };

#ifdef PDF_ENABLE_XFA
  class ProgressiveDecoder final : public ProgressiveDecoderIface {
   public:
    static ProgressiveDecoder* GetInstance();

    static std::unique_ptr<Context> Start();

    static jmp_buf& GetJumpMark(Context* pContext);

    static int ReadHeader(Context* pContext,
                          int* width,
                          int* height,
                          int* nComps,
                          CFX_DIBAttribute* pAttribute);

    static bool StartScanline(Context* pContext, int down_scale);
    static bool ReadScanline(Context* pContext, uint8_t* dest_buf);

    ProgressiveDecoder();

    // ProgressiveDecoderIface:
    FX_FILESIZE GetAvailInput(Context* pContext) const override;
    bool Input(Context* pContext,
               RetainPtr<CFX_CodecMemory> codec_memory,
               CFX_DIBAttribute* pAttribute) override;
  };
#endif  // PDF_ENABLE_XFA

  static std::unique_ptr<ScanlineDecoder> CreateDecoder(
      pdfium::span<const uint8_t> src_span,
      int width,
      int height,
      int nComps,
      bool ColorTransform);

  static Optional<JpegImageInfo> LoadInfo(pdfium::span<const uint8_t> src_span);

#if defined(OS_WIN)
  static bool JpegEncode(const RetainPtr<CFX_DIBBase>& pSource,
                         uint8_t** dest_buf,
                         size_t* dest_size);
#endif  // defined(OS_WIN)

  JpegModule() = delete;
  JpegModule(const JpegModule&) = delete;
  JpegModule& operator=(const JpegModule&) = delete;
};

}  // namespace fxcodec

using JpegModule = fxcodec::JpegModule;

#endif  // CORE_FXCODEC_JPEG_JPEGMODULE_H_