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March 14, 2026 07:25
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| /* | |
| DO WHAT THE FUCK YOU WANT TO BUT IT'S NOT MY FAULT PUBLIC LICENSE | |
| Version 1, October 2013 | |
| Everyone is permitted to copy and distribute verbatim or modified copies | |
| of this license document, and changing it is allowed as long as the name | |
| is changed. | |
| DO WHAT THE FUCK YOU WANT TO BUT IT'S NOT MY FAULT PUBLIC LICENSE TERMS | |
| AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION: | |
| 0. You just DO WHAT THE FUCK YOU WANT TO. | |
| 1. Do not hold the author(s), creator(s), developer(s) or distributor(s) | |
| liable for anything that happens or goes wrong with your use of the work. | |
| */ | |
| //Memo: http://www.ece.ualberta.ca/~elliott/ee552/studentAppNotes/2003_w/misc/bmp_file_format/bmp_file_format.htm | |
| #include <stdint.h> | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <string.h> | |
| typedef struct __attribute__((__packed__)) { | |
| char Signature[2]; | |
| uint32_t FileSize; | |
| uint32_t Reserved; | |
| uint32_t DataOffset; | |
| } bmp_header_struct; | |
| typedef struct __attribute__((__packed__)) { | |
| uint32_t Size; | |
| uint32_t Width; | |
| uint32_t Height; | |
| uint16_t Planes; | |
| uint16_t BitsPerPixel; | |
| uint32_t Compression; | |
| uint32_t ImageSize; | |
| uint32_t XPixelsPerMeter; | |
| uint32_t YPixelsPerMeter; | |
| uint32_t ColorsUsed; | |
| uint32_t ImportantColors; | |
| } bmp_infoheader_struct; | |
| enum { red = 0x00ff0000, green = 0x0000ff00, blue = 0x000000ff }; | |
| int main() { | |
| FILE *bmp_file = fopen("write.bmp", "wb+"); | |
| if (!bmp_file) { | |
| fprintf(stderr, "Couldn't open file!\n"); | |
| return 127; | |
| } | |
| // uint24_t *pixel_x; | |
| // uint24_t *pixel_y; | |
| uint32_t *pixel_all; | |
| bmp_header_struct bmp_header0; | |
| bmp_infoheader_struct bmp_infoheader0; | |
| strncpy(bmp_header0.Signature, "BM", 2); | |
| bmp_header0.FileSize = 0; | |
| bmp_header0.Reserved = 0; | |
| bmp_header0.DataOffset = 36; | |
| bmp_infoheader0.Size = 40; | |
| bmp_infoheader0.Width = 400; | |
| bmp_infoheader0.Height = 1000; | |
| bmp_infoheader0.Planes = 1; | |
| bmp_infoheader0.BitsPerPixel = 24; | |
| bmp_infoheader0.Compression = 0; | |
| bmp_infoheader0.ImageSize = 0; | |
| bmp_infoheader0.XPixelsPerMeter = 0; | |
| bmp_infoheader0.YPixelsPerMeter = 0; | |
| bmp_infoheader0.ColorsUsed = 0; | |
| bmp_infoheader0.ImportantColors = 0; | |
| fwrite(&bmp_header0, sizeof(bmp_header0), 1, bmp_file); | |
| fwrite(&bmp_infoheader0, sizeof(bmp_infoheader0), 1, bmp_file); | |
| pixel_all = | |
| malloc(sizeof(uint32_t) * bmp_infoheader0.Width * bmp_infoheader0.Height); | |
| for (uint32_t y = 0; y < bmp_infoheader0.Height; y++) { | |
| for (uint32_t x = 0; x < bmp_infoheader0.Width; x++) { | |
| if (y < 1000) | |
| pixel_all[y] = blue; | |
| if (y < 620) | |
| pixel_all[y] = green; | |
| if (y < 320) | |
| pixel_all[y] = red; | |
| fwrite(pixel_all + y, 3, 1, bmp_file); | |
| } | |
| } | |
| uint32_t FileSize = ftell(bmp_file); | |
| fseek(bmp_file, 2, SEEK_SET); | |
| fwrite(&FileSize, sizeof(uint32_t), 1, bmp_file); | |
| free(pixel_all); | |
| fclose(bmp_file); | |
| printf("writing successful\n"); | |
| return 0; | |
| } |
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