changing RGB pixel in bitmap C++ - c++

Question

I am trying to write a function which will change all RGB(255,0,0) pixels to RGB(255,0,255) but it doesn't seem to work :D Could anyone tell me the reason why it doesn't work/show me the right way to do it. All criticism all appreciated.
Here is part of my code:
#include <stdio.h>
#include <Windows.h>
#include <stdint.h>
struct BmpSignature
{
unsigned char data[2];
};
#pragma pack(1)
struct BmpHeader
{
BmpSignature signature;
uint32_t fileSize;
uint16_t reserved1;
uint16_t reserved2;
uint32_t dataOffset;
};
struct BmpDib
{
uint32_t dibSize;
int32_t imageWidth;
int32_t imageHeight;
uint16_t colorPlaneCount;
uint16_t pixelSize;
uint32_t compressMethod;
uint32_t bitmapByteCount;
int32_t horizontalResolution;
int32_t verticalResolution;
uint32_t colorCount;
uint32_t importantColorCount;
};
struct Color
{
unsigned char blue;
unsigned char green;
unsigned char red;
};
struct PixelArray
{
Color **pixels;
uint32_t rowCount;
uint32_t columnCount;
};
void changeBmp(PixelArray &p)
{
for (int i = 0; i < p.rowCount; i++)
for (int j = 0; j < p.columnCount; j++)
{
if (p.pixels[i][j].red == 255 && p.pixels[i][j].green == 0 && p.pixels[i][j].blue == 0)
{
p.pixels[i][j].blue = 255;
}
}
}
void readBmpPixelArray(FILE *f, BmpHeader header, BmpDib dib, PixelArray &data)
{
if (f == NULL)
return;
data.rowCount = dib.imageHeight;
data.columnCount = dib.imageWidth;
data.pixels = new Color*[data.rowCount];
char paddingCount = (4 - (dib.imageWidth * (dib.pixelSize / 8) % 4)) % 4;
fseek(f, header.dataOffset, 0L);
for (int i = 0; i < data.rowCount; i++)
{
scanBmpPixelLine(f, data.pixels[data.rowCount - i - 1], dib.imageWidth);
skipBmpPadding(f, paddingCount);
}
}
void writeBmpPixelArray(FILE *f, BmpHeader header, BmpDib dib, PixelArray &data)
{
if (f == NULL)
return;
data.rowCount = dib.imageHeight;
data.columnCount = dib.imageWidth;
char paddingCount = (4 - (dib.imageWidth * (dib.pixelSize / 8) % 4)) % 4;
fseek(f, header.dataOffset, 0L);
for (int i = 0; i < data.rowCount; i++)
{
writeBmpPixelLine(f, data.pixels[data.rowCount - i - 1], dib.imageWidth);
addBmpPadding(f, paddingCount);
}
}
void writeBmpPixelLine(FILE *f, Color *&line, uint32_t length)
{
if (f == NULL)
return;
fwrite(line, sizeof(Color), length, f);
}
void scanBmpPixelLine(FILE *f, Color *&line, uint32_t length)
{
if (f == NULL)
return;
line = new Color[length];
fread(line, sizeof(Color), length, f);
}
void addBmpPadding(FILE *f, char count)
{
if (f == NULL)
return;
if (count == 0)
return;
char padding[3];
fwrite(padding, count, 1, f);
}
void skipBmpPadding(FILE *f, char count)
{
if (f == NULL)
return;
if (count == 0)
return;
char padding[3];
fread(padding, count, 1, f);
}
void drawBmp(BmpDib dib, PixelArray data)
{
HWND console = GetConsoleWindow();
HDC hdc = GetDC(console);
for (int i = 0; i < dib.imageHeight; i++)
for (int j = 0; j < dib.imageWidth; j++)
{
Color pixel = data.pixels[i][j];
SetPixel(hdc, j, i, RGB(pixel.red, pixel.green, pixel.blue));
}
ReleaseDC(console, hdc);
}
void releaseBmpPixelArray(PixelArray data)
{
for (int i = 0; i < data.rowCount; i++)
delete[]data.pixels[i];
delete[]data.pixels;
}
int main()
{
BmpHeader header;
BmpDib info;
PixelArray data;
FILE * inputBMP;
inputBMP = fopen("D:\\Projects\\bitmap\\yoyo.bmp", "rb");
readBmpHeader(inputBMP, header);
printBmpHeader(header);
readBmpDib(inputBMP, info);
printBmpDib(info);
readBmpPixelArray(inputBMP, header, info, data);
HWND console = GetConsoleWindow();
if (console != NULL){ MoveWindow(console, 0, 0, 800, 600, TRUE); }
changeBmp(data);
drawBmp(info, data);
releaseBmpPixelArray(data);
fclose(inputBMP);
Sleep(100);
return 0;
}