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apng.hxx
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apng.hxx
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#ifndef APNG_HXX
#define APNG_HXX
#include <cstdint>
#include <cstddef>
#include <exception>
#include <array>
#include <vector>
#include <memory>
#include <utility>
#ifndef _MSC_VER
#if __GNUC__ >= 4
#define APNG_API __attribute__((visibility("default")))
#else
#define APNG_API
#endif
#else
#ifdef __APNG_lib__
#define APNG_API __declspec(dllexport)
#else
#define APNG_API __declspec(dllimport)
#endif
#endif
#include "stream.hxx"
struct chunkType_t final
{
private:
std::array<uint8_t, 4> _type;
public:
chunkType_t() = delete;
template<typename... T, char [sizeof...(T) == 4] = nullptr> constexpr chunkType_t(T... value) noexcept :
_type{uint8_t(value)...} { }
bool operator ==(const chunkType_t &chunk) const noexcept { return _type == chunk._type; }
bool operator ==(const std::array<uint8_t, 4> &value) const noexcept { return _type == value; }
bool operator ==(const uint8_t *const value) const noexcept;
bool operator !=(const chunkType_t &chunk) const noexcept { return _type != chunk._type; }
bool operator !=(const std::array<uint8_t, 4> &value) const noexcept { return _type != value; }
bool operator !=(const uint8_t *const value) const noexcept;
std::array<uint8_t, 4> &type() noexcept { return _type; }
const std::array<uint8_t, 4> &type() const noexcept { return _type; }
};
struct chunk_t final
{
private:
uint32_t _length;
chunkType_t _chunkType;
std::unique_ptr<uint8_t[]> _chunkData;
chunk_t() noexcept : _length(0), _chunkType{0, 0, 0, 0}, _chunkData(nullptr) { }
public:
chunk_t(chunk_t &&chunk) noexcept : _length(chunk._length), _chunkType(chunk._chunkType),
_chunkData(std::move(chunk._chunkData)) { }
chunk_t &operator =(chunk_t &&chunk) noexcept;
~chunk_t() noexcept = default;
uint32_t length() const noexcept { return _length; }
const chunkType_t &type() const noexcept { return _chunkType; }
const uint8_t *data() const noexcept { return _chunkData.get(); }
static chunk_t loadChunk(stream_t &stream);
chunk_t(const chunk_t &) = delete;
chunk_t &operator =(const chunk_t &) = delete;
};
struct APNG_API bitDepth_t final
{
public:
enum _bitDepth_t : uint8_t { bps1, bps2, bps4, bps8, bps16 };
private:
_bitDepth_t value;
public:
constexpr bitDepth_t() noexcept : value{bps8} { }
bitDepth_t(const uint8_t depth);
bitDepth_t(const bitDepth_t &) noexcept = default;
bitDepth_t(bitDepth_t &&) noexcept = default;
~bitDepth_t() noexcept = default;
bitDepth_t &operator =(const bitDepth_t &) noexcept = default;
bitDepth_t &operator =(bitDepth_t &&) noexcept = default;
operator _bitDepth_t() const noexcept { return value; }
};
struct APNG_API colourType_t final
{
public:
enum _colourType_t : uint8_t { greyscale, rgb, palette, greyscaleAlpha, rgba };
private:
_colourType_t value;
public:
constexpr colourType_t() noexcept : value{rgb} { }
colourType_t(const uint8_t type);
colourType_t(const colourType_t &) noexcept = default;
colourType_t(colourType_t &&) noexcept = default;
~colourType_t() noexcept = default;
colourType_t &operator =(const colourType_t &) noexcept = default;
colourType_t &operator =(colourType_t &&) noexcept = default;
operator _colourType_t() const noexcept { return value; }
};
struct APNG_API interlace_t final
{
public:
enum _interlace_t : uint8_t { none, adam7 };
private:
_interlace_t value;
public:
constexpr interlace_t() noexcept : value{none} { }
interlace_t(const uint8_t type);
interlace_t(const interlace_t &) noexcept = default;
~interlace_t() noexcept = default;
interlace_t(interlace_t &&) noexcept = default;
interlace_t &operator =(const interlace_t &) noexcept = default;
interlace_t &operator =(interlace_t &&) noexcept = default;
operator _interlace_t() const noexcept { return value; }
};
struct APNG_API disposeOp_t final
{
public:
enum _disposeOp_t { none, background, previous };
private:
_disposeOp_t value;
public:
constexpr disposeOp_t() noexcept : value{background} { }
disposeOp_t(const uint8_t op);
disposeOp_t(const disposeOp_t &) noexcept = default;
disposeOp_t(disposeOp_t &&) noexcept = default;
~disposeOp_t() noexcept = default;
disposeOp_t &operator =(const disposeOp_t &) noexcept = default;
disposeOp_t &operator =(disposeOp_t &&) noexcept = default;
operator _disposeOp_t() const noexcept { return value; }
};
struct APNG_API blendOp_t final
{
public:
enum _blendOp_t { source, over };
private:
_blendOp_t value;
public:
constexpr blendOp_t() noexcept : value{source} { }
blendOp_t(const uint8_t op);
blendOp_t(const blendOp_t &) noexcept = default;
blendOp_t(blendOp_t &&) noexcept = default;
~blendOp_t() noexcept = default;
blendOp_t &operator =(const blendOp_t &) noexcept = default;
blendOp_t &operator =(blendOp_t &&) noexcept = default;
operator _blendOp_t() const noexcept { return value; }
};
struct acTL_t final
{
private:
uint32_t _frames;
uint32_t _loops;
acTL_t(const uint8_t *const data) noexcept;
public:
constexpr acTL_t() noexcept : _frames(1), _loops(0) { }
acTL_t(const acTL_t &) noexcept = default;
acTL_t(acTL_t &&) noexcept = default;
~acTL_t() noexcept = default;
acTL_t &operator =(const acTL_t &) noexcept = default;
acTL_t &operator =(acTL_t &&acTL) noexcept = default;
static acTL_t reinterpret(const chunk_t &chunk);
void check(const std::vector<chunk_t> &chunks) const;
uint32_t frames() const noexcept { return _frames; }
uint32_t loops() const noexcept { return _loops; }
};
struct fcTL_t final
{
private:
uint32_t _frame;
uint32_t _sequenceIndex;
uint32_t _width;
uint32_t _height;
uint32_t _xOffset;
uint32_t _yOffset;
uint16_t _delayN;
uint16_t _delayD;
disposeOp_t _disposeOp;
blendOp_t _blendOp;
fcTL_t(const uint8_t *const data, const uint32_t frame) noexcept;
public:
constexpr fcTL_t() noexcept : _frame{}, _sequenceIndex{}, _width{}, _height{}, _xOffset{},
_yOffset{}, _delayN{}, _delayD{}, _disposeOp{}, _blendOp{} { }
fcTL_t(const fcTL_t &) noexcept = default;
fcTL_t(fcTL_t &&) noexcept = default;
~fcTL_t() noexcept = default;
fcTL_t &operator =(const fcTL_t &) noexcept = default;
fcTL_t &operator =(fcTL_t &&) noexcept = default;
static fcTL_t reinterpret(const chunk_t &chunk, const uint32_t frame);
void check(const uint32_t pngWidth, const uint32_t pngHeight, const bool first = false);
uint32_t sequenceIndex() const noexcept { return _sequenceIndex; }
uint32_t width() const noexcept { return _width; }
uint32_t height() const noexcept { return _height; }
uint32_t xOffset() const noexcept { return _xOffset; }
uint32_t yOffset() const noexcept { return _yOffset; }
uint16_t delayN() const noexcept { return _delayN; }
uint16_t delayD() const noexcept { return _delayD; }
disposeOp_t disposeOp() const noexcept { return _disposeOp; }
blendOp_t blendOp() const noexcept { return _blendOp; }
};
enum class pixelFormat_t : uint8_t
{
format8bppGrey,
format16bppGrey,
format8bppGreyA,
format16bppGreyA,
format24bppRGB,
format32bppRGBA,
format48bppRGB,
format64bppRGBA
};
struct APNG_API displayTime_t final
{
private:
const uint32_t delayN, delayD;
public:
constexpr displayTime_t(const uint32_t N, const uint32_t D) noexcept : delayN{N}, delayD{D} { }
displayTime_t(const displayTime_t &) noexcept = default;
~displayTime_t() noexcept = default;
void waitFor() const noexcept;
displayTime_t(displayTime_t &&) = delete;
displayTime_t &operator =(const displayTime_t &) = delete;
displayTime_t &operator =(displayTime_t &&) = delete;
};
struct APNG_API bitmap_t final
{
private:
std::unique_ptr<uint8_t []> _data;
const uint32_t _width, _height;
const pixelFormat_t _format;
bool transValueValid;
uint16_t transValue[3];
public:
bitmap_t(const uint32_t width, const uint32_t height, const pixelFormat_t format);
const uint8_t *data() const noexcept { return _data.get(); }
uint8_t *data() noexcept { return _data.get(); }
void *rawData() noexcept { return _data.get(); }
uint32_t width() const noexcept { return _width; }
uint32_t height() const noexcept { return _height; }
pixelFormat_t format() const noexcept { return _format; }
bool hasTransparency() const noexcept { return transValueValid; }
template<typename T> T transparent() const noexcept { return T{}; }
void transparent(const uint16_t *const value) noexcept
{
transValue[0] = value[0];
transValue[1] = value[1];
transValue[2] = value[2];
transValueValid = true;
}
};
struct APNG_API apng_t final
{
private:
using chunkList_t = std::vector<chunk_t>;
using chunkIter_t = chunkList_t::const_iterator;
uint32_t _width;
uint32_t _height;
bitDepth_t _bitDepth;
colourType_t _colourType;
interlace_t _interlacing;
acTL_t controlChunk;
bitmap_t *_defaultFrame;
std::vector<std::pair<fcTL_t, std::unique_ptr<bitmap_t>>> _frames;
std::unique_ptr<bitmap_t> defaultFrameStorage;
bool transColourValid;
uint16_t transColour[3];
public:
apng_t(stream_t &stream);
uint32_t width() const noexcept { return _width; }
uint32_t height() const noexcept { return _height; }
bitDepth_t bitDepth() const noexcept { return _bitDepth; }
colourType_t colourType() const noexcept { return _colourType; }
interlace_t interlacing() const noexcept { return _interlacing; }
const bitmap_t *defaultFrame() const noexcept { return _defaultFrame; }
pixelFormat_t pixelFormat() const;
uint32_t loops() const noexcept { return controlChunk.loops(); }
std::vector<std::pair<const displayTime_t, const bitmap_t *const>> frames() const noexcept;
private:
void checkSig(stream_t &stream);
void validateHeader();
bool processFrame(stream_t &stream, bitmap_t &frame);
uint32_t processDefaultFrame(const chunkList_t &chunks, const bool isSequenceFrame, const chunk_t &controlChunk);
void processFrame(const chunkIter_t &chunkBegin, const chunkIter_t &chunkEnd, const uint32_t frameIndex,
const chunk_t &controlChunk);
};
struct APNG_API invalidPNG_t : public std::exception
{
public:
invalidPNG_t() noexcept = default;
const char *what() const noexcept { return "Invalid PNG file"; }
};
#endif /*APNG_HXX*/