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112 lines
3.9 KiB
C++
112 lines
3.9 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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#ifndef WEBPIMAGE_HPP
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#define WEBPIMAGE_HPP
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// *****************************************************************************
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#include "exiv2lib_export.h"
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// included header files
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#include "image.hpp"
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// *****************************************************************************
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// namespace extensions
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namespace Exiv2 {
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// *****************************************************************************
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// class definitions
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/*!
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@brief Class to access WEBP video files.
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*/
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class EXIV2API WebPImage : public Image {
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public:
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//! @name Creators
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//@{
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/*!
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@brief Constructor for a WebP video. Since the constructor
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can not return a result, callers should check the good() method
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after object construction to determine success or failure.
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@param io An auto-pointer that owns a BasicIo instance used for
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reading and writing image metadata. \b Important: The constructor
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takes ownership of the passed in BasicIo instance through the
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auto-pointer. Callers should not continue to use the BasicIo
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instance after it is passed to this method. Use the Image::io()
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method to get a temporary reference.
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*/
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explicit WebPImage(BasicIo::UniquePtr io);
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//@}
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//! @name Manipulators
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//@{
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void readMetadata() override;
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void writeMetadata() override;
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void printStructure(std::ostream& out, PrintStructureOption option, size_t depth) override;
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//@}
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/*!
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@brief Not supported. Calling this function will throw an Error(ErrorCode::kerInvalidSettingForImage).
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*/
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void setComment(const std::string&) override;
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void setIptcData(const IptcData& /*iptcData*/) override;
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//! @name Accessors
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//@{
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[[nodiscard]] std::string mimeType() const override;
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//@}
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~WebPImage() override = default;
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//! Copy constructor
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WebPImage(const WebPImage&) = delete;
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//! Assignment operator
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WebPImage& operator=(const WebPImage&) = delete;
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//@}
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private:
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void doWriteMetadata(BasicIo& outIo);
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//! Finds the offset of header in data. Returns std::string::npos if the header isn't found.
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static size_t getHeaderOffset(const byte* data, size_t data_size, const byte* header, size_t header_size);
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static bool equalsWebPTag(Exiv2::DataBuf& buf, const char* str);
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void debugPrintHex(byte* data, size_t size);
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void decodeChunks(uint32_t filesize);
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void inject_VP8X(BasicIo& iIo, bool has_xmp, bool has_exif, bool has_alpha, bool has_icc, uint32_t width,
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uint32_t height);
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/* Misc. */
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static constexpr byte WEBP_PAD_ODD = 0;
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static constexpr int WEBP_TAG_SIZE = 0x4;
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/* VP8X feature flags */
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static constexpr int WEBP_VP8X_ICC_BIT = 0x20;
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static constexpr int WEBP_VP8X_ALPHA_BIT = 0x10;
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static constexpr int WEBP_VP8X_EXIF_BIT = 0x8;
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static constexpr int WEBP_VP8X_XMP_BIT = 0x4;
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/* Chunk header names */
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static constexpr auto WEBP_CHUNK_HEADER_VP8X = "VP8X";
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static constexpr auto WEBP_CHUNK_HEADER_VP8L = "VP8L";
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static constexpr auto WEBP_CHUNK_HEADER_VP8 = "VP8 ";
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static constexpr auto WEBP_CHUNK_HEADER_ANMF = "ANMF";
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static constexpr auto WEBP_CHUNK_HEADER_ANIM = "ANIM";
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static constexpr auto WEBP_CHUNK_HEADER_ICCP = "ICCP";
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static constexpr auto WEBP_CHUNK_HEADER_EXIF = "EXIF";
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static constexpr auto WEBP_CHUNK_HEADER_XMP = "XMP ";
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}; // Class WebPImage
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// *****************************************************************************
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// template, inline and free functions
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// These could be static private functions on Image subclasses but then
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// ImageFactory needs to be made a friend.
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/*!
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@brief Create a new WebPImage instance and return an auto-pointer to it.
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Caller owns the returned object and the auto-pointer ensures that
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it will be deleted.
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*/
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EXIV2API Image::UniquePtr newWebPInstance(BasicIo::UniquePtr io, bool create);
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//! Check if the file iIo is a WebP Video.
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EXIV2API bool isWebPType(BasicIo& iIo, bool advance);
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} // namespace Exiv2
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#endif // WEBPIMAGE_HPP
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