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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Most BMP Image generation code is from https://stackoverflow.com/a/47785639/15819675
const int BYTES_PER_PIXEL = 3; /// red, green, & blue
const int FILE_HEADER_SIZE = 14;
const int INFO_HEADER_SIZE = 40;
void generateBitmapImage(unsigned char* image, int height, int width, char* imageFileName);
unsigned char* createBitmapFileHeader(int height, int stride);
unsigned char* createBitmapInfoHeader(int height, int width);
void generateBitmapImage (unsigned char* image, int height, int width, char* imageFileName)
{
int widthInBytes = width * BYTES_PER_PIXEL;
unsigned char padding[3] = {0, 0, 0};
int paddingSize = (4 - (widthInBytes) % 4) % 4;
int stride = (widthInBytes) + paddingSize;
FILE* imageFile = fopen(imageFileName, "wb");
unsigned char* fileHeader = createBitmapFileHeader(height, stride);
fwrite(fileHeader, 1, FILE_HEADER_SIZE, imageFile);
unsigned char* infoHeader = createBitmapInfoHeader(height, width);
fwrite(infoHeader, 1, INFO_HEADER_SIZE, imageFile);
int i;
for (i = 1; i <= height; i++) {
fwrite(image + ((height - i)*widthInBytes), BYTES_PER_PIXEL, width, imageFile);
fwrite(padding, 1, paddingSize, imageFile);
}
fclose(imageFile);
}
unsigned char* createBitmapFileHeader (int height, int stride)
{
int fileSize = FILE_HEADER_SIZE + INFO_HEADER_SIZE + (stride * height);
static unsigned char fileHeader[] = {
0,0, /// signature
0,0,0,0, /// image file size in bytes
0,0,0,0, /// reserved
0,0,0,0, /// start of pixel array
};
fileHeader[ 0] = (unsigned char)('B');
fileHeader[ 1] = (unsigned char)('M');
fileHeader[ 2] = (unsigned char)(fileSize );
fileHeader[ 3] = (unsigned char)(fileSize >> 8);
fileHeader[ 4] = (unsigned char)(fileSize >> 16);
fileHeader[ 5] = (unsigned char)(fileSize >> 24);
fileHeader[10] = (unsigned char)(FILE_HEADER_SIZE + INFO_HEADER_SIZE);
return fileHeader;
}
unsigned char* createBitmapInfoHeader (int height, int width)
{
static unsigned char infoHeader[] = {
0,0,0,0, /// header size
0,0,0,0, /// image width
0,0,0,0, /// image height
0,0, /// number of color planes
0,0, /// bits per pixel
0,0,0,0, /// compression
0,0,0,0, /// image size
0,0,0,0, /// horizontal resolution
0,0,0,0, /// vertical resolution
0,0,0,0, /// colors in color table
0,0,0,0, /// important color count
};
infoHeader[ 0] = (unsigned char)(INFO_HEADER_SIZE);
infoHeader[ 4] = (unsigned char)(width );
infoHeader[ 5] = (unsigned char)(width >> 8);
infoHeader[ 6] = (unsigned char)(width >> 16);
infoHeader[ 7] = (unsigned char)(width >> 24);
infoHeader[ 8] = (unsigned char)(height );
infoHeader[ 9] = (unsigned char)(height >> 8);
infoHeader[10] = (unsigned char)(height >> 16);
infoHeader[11] = (unsigned char)(height >> 24);
infoHeader[12] = (unsigned char)(1);
infoHeader[14] = (unsigned char)(BYTES_PER_PIXEL*8);
return infoHeader;
}
void convertBinToRaw(char* file, int width, int height) {
unsigned char white[3] = {255,255,255};
unsigned char black[3] = {0,0,0};
unsigned char* grid = malloc(sizeof(unsigned char) * width * height);
FILE* fp = fopen(file, "rb");
fread(grid, sizeof(unsigned char), width*height, fp);
fclose(fp);
int i;
char* raw_file_name;
sprintf(raw_file_name, "%s.bmp", file);
unsigned char* full_image = malloc(sizeof(unsigned char) * width * height * 3);
for (i = 0; i < width*height; i++) {
if (grid[i]) {
memcpy(&full_image[i*3], &white, sizeof(unsigned char) * 3);
} else {
memcpy(&full_image[i*3], &black, sizeof(unsigned char) * 3);
}
}
generateBitmapImage(full_image, height, width, raw_file_name);
free(grid);
free(full_image);
}
int main(int argc, char** argv) {
char* file_name;
int width, height;
if (argc == 4) {
file_name = argv[1];
width = atoi(argv[2]);
height = atoi(argv[3]);
} else {
printf("Usage: ./convert_bin_to_img <file> <width> <height>\n");
exit(1);
}
convertBinToRaw(file_name, width, height);
return 0;
}
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