Git地址：
/whik/bmp_gen_c_and_verilog/tree/master/c
BMP文件格式详解参考：
Verilog实现生成BMP文件（BMP文件格式，二进制文件读写）BMP文件格式详解C语言生成BMP文件
C语言实现生成BMP，注意宽度必须进行4字节对齐，使用0来补充，否则部分宽度图片生成乱码。可使用PhotoShop生成宽度10，长度5的图片验证，数据存储为BMP文件最后一行为图片第一行的像素数据。先选择图像->模式->8位/通道，再保存为BMP，Windows，24Bit。使用联合体实现大小端转换。
#include <stdio.h>#include <stdlib.h>#include <stdint.h>/*/nibiewuxuanze/article/details/78805763按小端字节序来存储，且宽度数据必须成4字节对齐。图像数据区也不例外，按每行图像的数据字节，按4字节对齐。图像数据按行倒序存放，先存储最后一行图像数据，然后依次存放，直到第一行数据。这样设计，可能是为了从文件尾部往前读的时候，能够直接顺序读出图像数据吧。*/typedef union {uint8_t bytes[4];uint32_t value;}LITTLE;/** @fileName: bmp file name: test.bmp* @width : bmp pixel width: 32bit* @height : bmp pixel width: 32bit* @color : R[8]/G[8]/B[8]* @note : BMP is l endian mode*/int bmp_gen_test(char *fileName, uint32_t width, uint32_t height, uint32_t color){FILE *fp;uint32_t i, j;LITTLE l_width, l_height, l_bfSize, l_biSizeImage;uint8_t r = color >> 16;uint8_t g = color >> 8;uint8_t b = color;uint32_t width_r = (width * 24 / 8 + 3) / 4 * 4;uint32_t bfSize = width_r * height + 54 + 2;uint32_t biSizeImage = width_r * height;l_width.value = width;l_height.value = height;l_bfSize.value = bfSize;l_biSizeImage.value = biSizeImage;/* BMP file format: /wainiwann/p/7086844.html */uint8_t bmp_head_map[54] = {/* bmp file header: 14 byte */0x42, 0x4d,// bmp pixel size: width * height * 3 + 54l_bfSize.bytes[0], l_bfSize.bytes[1], l_bfSize.bytes[2], l_bfSize.bytes[3],0, 0 , 0, 0,54, 0 , 0, 0, /* 14+40=54 *//* bmp map info: 40 byte */40, 0, 0, 0,//widthl_width.bytes[0], l_width.bytes[1], l_width.bytes[2], l_width.bytes[3],//heightl_height.bytes[0], l_height.bytes[1], l_height.bytes[2], l_height.bytes[3],1, 0,24, 00, /* 24 bit: R[8]/G[8]/B[8] */0, 0, 0, 0,//biCompression:0// 0, 0, 0, 0,//biSizeImage锛欰2 00 00 00=162l_biSizeImage.bytes[0], l_biSizeImage.bytes[1], l_biSizeImage.bytes[2], l_biSizeImage.bytes[3],0, 0, 0, 0,//biXPelsPerMeter: 60 0F 00 000, 0, 0, 0,//biYPelsPerMeter0, 0, 0, 0,//biClrUsed0, 0, 0, 0//biClrImportant};/* write in binary format */fp = fopen(fileName, "wb+");if(fp == NULL){printf("%s: file create failed!\n", fileName);return -1;}printf("%s: file create success!\n", fileName);fwrite(bmp_head_map, sizeof(bmp_head_map), 1, fp);for(i = 0; i < height; i++) {for(j = 0; j < width; j++)fprintf(fp, "%c%c%c", b, g, r); /* BGR *///4 byte alignfor(j = 0; j < width_r-width*3; j++)fprintf(fp, "%c", 0);}fprintf(fp, "%c%c", 0, 0); //PhotoShop two byte "0"if(fclose(fp)){printf("file close failed!\n");return -1;}fp = NULL;printf("width: %d\n", width);printf("height: %d\n", height);printf("R:%d, G:%d, B:%d or #%06x\n", r, g, b, color);return 0;}int main(int argc, char *argv[]){int ret;char bmpName[200];char *name = "test";uint32_t width = 951;uint32_t height = 511;uint32_t color = 0x563412;/* generate bmp file name */sprintf(bmpName, "%s_%d_%d_0x%06x.bmp", name, width, height, color);printf("bmpName: %s\n", bmpName);ret = bmp_gen_test(bmpName, width, height, color);if(!ret)system(bmpName);system("pause");return 0;}
生成的test_951_511_0x563412.bmp
Git地址：
/whik/bmp_gen_c_and_verilog/tree/master/c
