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#include "WEBPImage.h"
#include "reader.h"
#define ENABLE_DEBUG
#include "debug.h"
#include <iostream>
using std::cout, std::endl;
namespace TehImage
{
int WEBPImage::writeToFile(std::string filename)
{
cout << "Not implemented" << endl;
return 1;
}
int WEBPImage::readFromFile(std::string filename)
{
static_assert(std::endian::native == std::endian::little, "Must use little endian");
reader = std::make_unique<Reader>(filename, FileEndianness::LITTLE);
refreshBitBuffer();
char RIFF[4], WEBP[4];
char RIFFExpected[] = {'R','I','F','F'};
readFourCC(RIFF);
uint32_t imgSize = readBits(32);
readFourCC(WEBP);
char WEBPExpected[] = {'W','E','B','P'};
if(strncmp(RIFF, RIFFExpected, 4) != 0 || strncmp(WEBP, WEBPExpected, 4) != 0)
{
cout << "Not a webp" << endl;
// cout << '#' << std::hex << RIFF.raw << " #" << RIFFExpected.raw << std::dec << endl;
// cout << '#' << std::hex << WEBP.raw << " #" << WEBPExpected.raw << std::dec << endl;
return 1;
}
// refreshBitBuffer();
char VP8L[4];
readFourCC(VP8L);
char VP8LExpected[] = {'V', 'P', '8', 'L'};
uint32_t VP8LSize = readBits(32);
uint8_t signature = readBits(8);
if(strncmp(VP8L, VP8LExpected, 4) != 0)
{
cout << "VP8L error" << endl;
return 1;
}
uint16_t width = readBits(14) + 1;
uint16_t height = readBits(14) + 1;
cout << width << " " << height << endl;
bool alpha = readBits(1);
uint8_t versionNumber = readBits(3);
cout << "Alpha: " << (alpha?"Y":"N") << ", version: " << 0+versionNumber << endl;
if (readBits(1)) {
cout << (int) readBits(2) << endl;
}
cout << "Not finished" << endl;
return 1;
}
bool WEBPImage::readBit()
{
bool res = bitBuffer & (1 << (bitBufferPos++));
if(bitBufferPos >= 8)
refreshBitBuffer();
return res?1:0;
}
uint32_t WEBPImage::readBits(size_t count)
{
uint32_t out = 0;
for(int i = 0; i < count; i++)
{
out |= readBit() << i;
}
return out;
}
void WEBPImage::readFourCC(char* dest)
{
for(int i = 0; i < 4; i++)
{
dest[i] = readBits(8);
}
}
void WEBPImage::refreshBitBuffer()
{
bitBuffer = reader->readByte();
bitBufferPos = 0;
}
}
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