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#pragma once
#include "files.h"
#include "image.h"
#include "zlib.h"
#include <cstddef>
#include <cstdint>
#include <map>
#include <memory>
#include <string>
#include <vector>
#define CHUNK_READER(X) void read##X(uint32_t chunkSize)
#define REGISTER_CHUNK_READER(X) chunkReaders.insert({#X, &PNGImage::read##X})
#define DEFINE_CHUNK_READER(X) void PNGImage::read##X(uint32_t chunkSize)
#define CHUNK_WRITER(X) void write##X()
#define DEFINE_CHUNK_WRITER(X) void PNGImage::write##X()
namespace TehImage
{
class PNGImage : public Image
{
public:
typedef enum
{
GRAYSCALE = 0,
TRUECOLOR = 2,
INDEXED = 3,
ALPHA = 4
} ColorTypes;
PNGImage();
~PNGImage();
// template<std::derived_from<Image> T> PNGImage(const T& other) : Image(other) { }
PNGImage(const Image& other) : Image(other) {}
int readFromFile(std::string filename) override;
int writeToFile(std::string filename) override;
// sRGB
uint8_t renderingIntent;
// pHYs
uint32_t pixelsPerX;
uint32_t pixelsPerY;
uint8_t unit;
// tIME
uint16_t year;
uint8_t month;
uint8_t day;
uint8_t hour;
uint8_t minute;
uint8_t second;
private:
std::map<std::string, void(PNGImage::*)(uint32_t chunkSize)> chunkReaders;
CHUNK_READER(IHDR);
CHUNK_READER(iCCP);
CHUNK_READER(sRGB);
CHUNK_READER(eXIf);
CHUNK_READER(iDOT);
CHUNK_READER(pHYs);
CHUNK_READER(tIME);
CHUNK_READER(tEXt);
CHUNK_READER(IDAT);
CHUNK_READER(IEND);
CHUNK_WRITER(IHDR);
CHUNK_WRITER(IDAT);
CHUNK_WRITER(IEND);
bool readNextChunk();
uint32_t calculateCRC(uint8_t *buffer, std::size_t bufflen);
const uint64_t PNG_CRC = 0x104C11DB7;
ZLib zlib;
uint8_t* idatData;
unsigned long idatDataSize;
bool end = false;
Reader *reader;
Writer *writer;
};
}
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