webpimage.hpp

// SPDX-License-Identifier: GPL-2.0-or-later
 
#ifndef WEBPIMAGE_HPP
#define WEBPIMAGE_HPP
 
// *****************************************************************************
#include "exiv2lib_export.h"
 
// included header files
#include "image.hpp"
 
// *****************************************************************************
// namespace extensions
namespace Exiv2 {
// *****************************************************************************
// class definitions
 
class EXIV2API WebPImage : public Image {
 public:
 
 
  explicit WebPImage(BasicIo::UniquePtr io);
 
 
  void readMetadata() override;
  void writeMetadata() override;
  void printStructure(std::ostream& out, PrintStructureOption option, size_t depth) override;
 
  void setComment(const std::string&) override;
  void setIptcData(const IptcData& /*iptcData*/) override;
 
 
  [[nodiscard]] std::string mimeType() const override;
 
 private:
  void doWriteMetadata(BasicIo& outIo);
 
  static size_t getHeaderOffset(const byte* data, size_t data_size, const byte* header, size_t header_size);
 
  static bool equalsWebPTag(const Exiv2::DataBuf& buf, const char* str);
  void debugPrintHex(byte* data, size_t size);
  void decodeChunks(uint32_t filesize);
  void inject_VP8X(BasicIo& iIo, bool has_xmp, bool has_exif, bool has_alpha, bool has_icc, uint32_t width,
                   uint32_t height) const;
  /* Misc. */
  static constexpr byte WEBP_PAD_ODD = 0;
  static constexpr int WEBP_TAG_SIZE = 0x4;
  /* VP8X feature flags */
  static constexpr int WEBP_VP8X_ICC_BIT = 0x20;
  static constexpr int WEBP_VP8X_ALPHA_BIT = 0x10;
  static constexpr int WEBP_VP8X_EXIF_BIT = 0x8;
  static constexpr int WEBP_VP8X_XMP_BIT = 0x4;
  /* Chunk header names */
  static constexpr auto WEBP_CHUNK_HEADER_VP8X = "VP8X";
  static constexpr auto WEBP_CHUNK_HEADER_VP8L = "VP8L";
  static constexpr auto WEBP_CHUNK_HEADER_VP8 = "VP8 ";
  static constexpr auto WEBP_CHUNK_HEADER_ANMF = "ANMF";
  static constexpr auto WEBP_CHUNK_HEADER_ANIM = "ANIM";
  static constexpr auto WEBP_CHUNK_HEADER_ICCP = "ICCP";
  static constexpr auto WEBP_CHUNK_HEADER_EXIF = "EXIF";
  static constexpr auto WEBP_CHUNK_HEADER_XMP = "XMP ";
};  // Class WebPImage
 
// *****************************************************************************
// template, inline and free functions
 
// These could be static private functions on Image subclasses but then
// ImageFactory needs to be made a friend.
EXIV2API Image::UniquePtr newWebPInstance(BasicIo::UniquePtr io, bool create);
 
EXIV2API bool isWebPType(BasicIo& iIo, bool advance);
 
}  // namespace Exiv2
 
#endif  // WEBPIMAGE_HPP