Accessing a BMP file that has been loaded in - c

Question

I have some code that I found that reads in a .bmp file to my program, and I want to be able to access this file to draw it in a direct2d graphics program that I already have. Is this code set up in a way where I could do that or is it more for getting information about the .bmp file? Basically I just want to know if I can access the .bmp file using this code or if this is not set up for that.
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define DATA_OFFSET_OFFSET 0x000A
#define WIDTH_OFFSET 0x0012
#define HEIGHT_OFFSET 0x0016
#define BITS_PER_PIXEL_OFFSET 0x001C
#define HEADER_SIZE 14
#define INFO_HEADER_SIZE 40
#define NO_COMPRESION 0
#define MAX_NUMBER_OF_COLORS 0
#define ALL_COLORS_REQUIRED 0
typedef unsigned int int32;
typedef short int16;
typedef unsigned char byte;
//***Inputs*****
//fileName: The name of the file to open
//***Outputs****
//pixels: A pointer to a byte array. This will contain the pixel data
//width: An int pointer to store the width of the image in pixels
//height: An int pointer to store the height of the image in pixels
//bytesPerPixel: An int pointer to store the number of bytes per pixel that are used in the image
void ReadImage(const char *fileName,byte **pixels, int32 *width, int32 *height, int32 *bytesPerPixel)
{
//Open the file for reading in binary mode
FILE *imageFile = fopen(fileName, "rb");
//Read data offset
int32 dataOffset;
fseek(imageFile, DATA_OFFSET_OFFSET, SEEK_SET);
fread(&dataOffset, 4, 1, imageFile);
//Read width
fseek(imageFile, WIDTH_OFFSET, SEEK_SET);
fread(width, 4, 1, imageFile);
//Read height
fseek(imageFile, HEIGHT_OFFSET, SEEK_SET);
fread(height, 4, 1, imageFile);
//Read bits per pixel
int16 bitsPerPixel;
fseek(imageFile, BITS_PER_PIXEL_OFFSET, SEEK_SET);
fread(&bitsPerPixel, 2, 1, imageFile);
//Allocate a pixel array
*bytesPerPixel = ((int32)bitsPerPixel) / 8;
//Rows are stored bottom-up
//Each row is padded to be a multiple of 4 bytes.
//We calculate the padded row size in bytes
int paddedRowSize = (int)(4 * ceil((float)(*width) / 4.0f))*(*bytesPerPixel);
//We are not interested in the padded bytes, so we allocate memory just for
//the pixel data
int unpaddedRowSize = (*width)*(*bytesPerPixel);
//Total size of the pixel data in bytes
int totalSize = unpaddedRowSize*(*height);
*pixels = (byte*)malloc(totalSize);
//Read the pixel data Row by Row.
//Data is padded and stored bottom-up
int i = 0;
//point to the last row of our pixel array (unpadded)
byte *currentRowPointer = *pixels+((*height-1)*unpaddedRowSize);
for (i = 0; i < *height; i++)
{
//put file cursor in the next row from top to bottom
fseek(imageFile, dataOffset+(i*paddedRowSize), SEEK_SET);
//read only unpaddedRowSize bytes (we can ignore the padding bytes)
fread(currentRowPointer, 1, unpaddedRowSize, imageFile);
//point to the next row (from bottom to top)
currentRowPointer -= unpaddedRowSize;
}
fclose(imageFile);
}
int main()
{
byte *pixels;
int32 width;
int32 height;
int32 bytesPerPixel;
ReadImage("img.bmp", &pixels, &width, &height,&bytesPerPixel);
free(pixels);
return 0;
}
Would I use pixels to then display the bitmap image?