Простейшее чтение BMP-файла. Логика вынесена в класс.

bmpimage.h

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+#pragma once
+
+#include <cstdint>
+#include <string>
+#include <fstream>
+
+const char PADDING_ZEROES[3] = {0, 0, 0};
+
+#pragma pack(push, 1)
+struct BitmapFileHeader {
+    char signature[2] = {0, 0};
+    uint32_t fileSize = 0;
+    uint16_t reserved1 = 0;
+    uint16_t reserved2 = 0;
+    uint32_t imageDataOffset = 0;
+};
+#pragma pack(pop)
+
+#pragma pack(push, 1)
+struct BITMAPINFOHEADER {
+    uint32_t HeaderSize = 0;
+    uint32_t BitmapWidth = 0;
+    uint32_t BitmapHeight = 0;
+    uint16_t ColorPlanes = 0;
+    uint16_t BitsPerPixel = 0;
+    uint32_t CompressionMethod = 0;
+    uint32_t ImageSize = 0;
+    int32_t HorizontalPixelPerMetre = 0;
+    int32_t VerticalPixelPerMetre = 0;
+    uint32_t NumberOfColors = 0;
+    uint32_t NumberOfImportantColors = 0;
+};
+#pragma pack(pop)
+
+#pragma pack(push, 1)
+struct Pixel {
+    uint8_t r = 0;
+    uint8_t g = 0;
+    uint8_t b = 0;
+};
+#pragma pack(pop)
+
+class BMPImage {
+    BitmapFileHeader fileHeader;
+    BITMAPINFOHEADER infoHeader;
+    Pixel **pixelArray;
+public:
+    BMPImage(BitmapFileHeader &fileHeader, BITMAPINFOHEADER &infoHeader, Pixel **pixelArray);
+
+    [[nodiscard]] const uint32_t &width() const;
+
+    [[nodiscard]] const uint32_t &height() const;
+
+    void write(const std::string &);
+};
+
+BMPImage readBMPImage(const std::string &filename);