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// Copyright (C) 2018 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
//
#include "bmp.h"
#include <fstream>
#include <iostream>
using namespace std;
using namespace FormatReader;
BitMap::BitMap(const string &filename) {
BmpHeader header;
BmpInfoHeader infoHeader;
ifstream input(filename, ios::binary);
if (!input) {
return;
}
input.read(reinterpret_cast<char *>(&header.type), 2);
if (header.type != 'M'*256+'B') {
std::cerr << "[BMP] file is not bmp type\n";
return;
}
input.read(reinterpret_cast<char *>(&header.size), 4);
input.read(reinterpret_cast<char *>(&header.reserved), 4);
input.read(reinterpret_cast<char *>(&header.offset), 4);
input.read(reinterpret_cast<char *>(&infoHeader), sizeof(BmpInfoHeader));
bool rowsReversed = infoHeader.height < 0;
_width = infoHeader.width;
_height = abs(infoHeader.height);
if (infoHeader.bits != 24) {
cerr << "[BMP] 24bpp only supported. But input has:" << infoHeader.bits << "\n";
return;
}
if (infoHeader.compression != 0) {
cerr << "[BMP] compression not supported\n";
}
int padSize = _width & 3;
char pad[3];
size_t size = _width * _height * 3;
_data.reset(new unsigned char[size], std::default_delete<unsigned char[]>());
input.seekg(header.offset, ios::beg);
// reading by rows in invert vertically
for (uint32_t i = 0; i < _height; i++) {
uint32_t storeAt = rowsReversed ? i : (uint32_t)_height - 1 - i;
input.read(reinterpret_cast<char *>(_data.get()) + _width * 3 * storeAt, _width * 3);
input.read(pad, padSize);
}
}
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