65 lines
1.7 KiB
C++
65 lines
1.7 KiB
C++
// Copyright (C) 2018-2022 Intel Corporation
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// SPDX-License-Identifier: Apache-2.0
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//
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// clang-format off
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#include <fstream>
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#include <iostream>
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#include "bmp.h"
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// clang-format on
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using namespace std;
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using namespace FormatReader;
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BitMap::BitMap(const string& filename) {
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BmpHeader header;
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BmpInfoHeader infoHeader;
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ifstream input(filename, ios::binary);
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if (!input) {
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return;
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}
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input.read(reinterpret_cast<char*>(&header.type), 2);
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if (header.type != 'M' * 256 + 'B') {
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std::cerr << "[BMP] file is not bmp type\n";
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return;
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}
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input.read(reinterpret_cast<char*>(&header.size), 4);
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input.read(reinterpret_cast<char*>(&header.reserved), 4);
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input.read(reinterpret_cast<char*>(&header.offset), 4);
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input.read(reinterpret_cast<char*>(&infoHeader), sizeof(BmpInfoHeader));
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bool rowsReversed = infoHeader.height < 0;
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_width = infoHeader.width;
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_height = abs(infoHeader.height);
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if (infoHeader.bits != 24) {
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cerr << "[BMP] 24bpp only supported. But input has:" << infoHeader.bits << "\n";
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return;
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}
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if (infoHeader.compression != 0) {
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cerr << "[BMP] compression not supported\n";
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}
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int padSize = _width & 3;
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char pad[3];
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size_t size = _width * _height * 3;
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_data.reset(new unsigned char[size], std::default_delete<unsigned char[]>());
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input.seekg(header.offset, ios::beg);
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// reading by rows in invert vertically
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for (uint32_t i = 0; i < _height; i++) {
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uint32_t storeAt = rowsReversed ? i : (uint32_t)_height - 1 - i;
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input.read(reinterpret_cast<char*>(_data.get()) + _width * 3 * storeAt, _width * 3);
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input.read(pad, padSize);
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}
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}
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