81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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void save_bmp(const char *filename, unsigned char *img, size_t width, ssize_t height);
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int main(int argc, char const *argv[])
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{
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return 0;
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}
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void save_bmp(const char *filename, unsigned char *img, size_t width, ssize_t height) {
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FILE *fptr = fopen(filename,"wb");
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if(fptr == NULL) {
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fprintf(stderr,"ERROR: Could not open output file at %s\n.",filename);
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exit(EXIT_FAILURE);
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}
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int actual_height = (height < 0) ? -height : height;
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size_t row_padding = (4 - (width) * 3 % 4) % 4;
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size_t row_width = width * 3 + row_padding;
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size_t image_size = actual_height * row_width;
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size_t file_size = image_size + 54;
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unsigned char file_header[14] = {
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'B', 'M',
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0, 0, 0, 0,
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0, 0, 0, 0,
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54, 0, 0, 0
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};
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file_header[2] = (unsigned char)(file_size);
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file_header[3] = (unsigned char)(file_size >> 8);
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file_header[4] = (unsigned char)(file_size >> 16);
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file_header[5] = (unsigned char)(file_size >> 24);
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unsigned char info_header[40] = {
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40, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0,
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1, 0,
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24, 0,
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0, 0, 0, 0,
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0, 0, 0, 0,
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0x13, 0x0B, 0, 0,
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0x13, 0x0B, 0, 0,
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0, 0, 0, 0,
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0, 0, 0, 0
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};
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info_header[4] = (unsigned char)(width);
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info_header[5] = (unsigned char)(width >> 8);
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info_header[6] = (unsigned char)(width >> 16);
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info_header[7] = (unsigned char)(width >> 24);
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uint32_t h = (uint32_t)height;
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info_header[8] = (unsigned char)(h);
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info_header[9] = (unsigned char)(h >> 8);
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info_header[10] = (unsigned char)(h >> 16);
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info_header[11] = (unsigned char)(h >> 24);
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info_header[20] = (unsigned char)(image_size);
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info_header[21] = (unsigned char)(image_size >> 8);
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info_header[22] = (unsigned char)(image_size >> 16);
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info_header[23] = (unsigned char)(image_size >> 24);
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fwrite(file_header,1,14,fptr);
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fwrite(info_header,1,40,fptr);
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unsigned char padding_bytes[3] = {0, 0, 0};
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for(int i = 0; i < actual_height; i++) {
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fwrite(img + (i * width * 3), 3, width, fptr);
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if(row_padding > 0) {
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fwrite(padding_bytes,1,row_padding,fptr);
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}
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}
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fclose(fptr);
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} |