图片转二维数组

Llllln

求大神指导，图片怎么转换成二维数组呀？在网上看了很多也没弄成
可不可以有代码参考一下

tian1234

一般是用专门的软件转的哈

赚小钱

opencv CvMat

人造人

参考
https://www.cnblogs.com/wainiwann/p/7086844.html

bmp.h

1. #ifndef _READ_BMP_H_
   
2. #define _READ_BMP_H_
   
3. 
   
4. #include <stddef.h>
   
5. #include <stdint.h>
   
6. 
   
7. typedef struct {
   
8.     size_t width, height;
   
9.     uint8_t *data;
   
10. } *bmp_t;
    
11. 
    
12. bmp_t bmp_init(const char *filename);
    
13. void bmp_deinit(bmp_t bmp);
    
14. uint32_t bmp_get_pixel(const bmp_t bmp, size_t x, size_t y);
    
15. 
    
16. #endif
    

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bmp.c

1. #include "bmp.h"
   
2. #include <stdlib.h>
   
3. #include <fcntl.h>
   
4. #include <unistd.h>
   
5. #include <sys/stat.h>
   
6. #include <sys/mman.h>
   
7. 
   
8. #define BI_RGB 0
   
9. 
   
10. typedef struct tagBITMAPFILEHEADER {
    
11.     uint16_t bfType;
    
12.     uint32_t bfSize;
    
13.     uint16_t bfReserved1;
    
14.     uint16_t bfReserved2;
    
15.     uint32_t bfOffBits;
    
16. } __attribute__((packed)) BITMAPFILEHEADER,*LPBITMAPFILEHEADER,*PBITMAPFILEHEADER;
    
17. 
    
18. typedef struct tagBITMAPINFOHEADER {
    
19.     uint32_t biSize;
    
20.     uint32_t biWidth;
    
21.     uint32_t biHeight;
    
22.     uint16_t biPlanes;
    
23.     uint16_t biBitCount;
    
24.     uint32_t biCompression;
    
25.     uint32_t biSizeImage;
    
26.     uint32_t biXPelsPerMeter;
    
27.     uint32_t biYPelsPerMeter;
    
28.     uint32_t biClrUsed;
    
29.     uint32_t biClrImportant;
    
30. } __attribute__((packed)) BITMAPINFOHEADER,*LPBITMAPINFOHEADER,*PBITMAPINFOHEADER;
    
31. 
    
32. static bmp_t parse_bmp(uint8_t *base) {
    
33.     PBITMAPFILEHEADER bfh = (PBITMAPFILEHEADER)base;
    
34.     PBITMAPINFOHEADER bih = (PBITMAPINFOHEADER)(bfh + 1);
    
35.     uint8_t *bmp_data = base + bfh->bfOffBits;
    
36.     if(!(bih->biBitCount == 24 && bih->biCompression == BI_RGB)) return NULL;
    
37.     bmp_t bmp = malloc(sizeof(*bmp));
    
38.     if(!bmp) return NULL;
    
39.     bmp->width = bih->biWidth;
    
40.     bmp->height = bih->biHeight;
    
41.     bmp->data = malloc(bmp->width * bmp->height * 4);
    
42.     if(!bmp->data) {
    
43.         free(bmp); return NULL;
    
44.     }
    
45.     size_t row_size = bmp->width * 3;
    
46.     row_size = row_size & 0x03 ? (row_size & ~0x03) + 4 : row_size;
    
47.     uint32_t *dest_pixel = (uint32_t *)bmp->data;
    
48.     for(size_t h = 0; h < bmp->height; ++h) {
    
49.         uint8_t *row_base = bmp_data + (bmp->height - h - 1) * row_size;
    
50.         for(size_t w = 0; w < bmp->width; ++w) {
    
51.             uint8_t *rgb = row_base + w * 3;
    
52.             uint32_t src_pixel = rgb[0] | rgb[1] << 8 | rgb[2] << 16;
    
53.             dest_pixel[h * bmp->width + w] = src_pixel;
    
54.         }
    
55.     }
    
56.     return bmp;
    
57. }
    
58. 
    
59. bmp_t bmp_init(const char *filename) {
    
60.     if(!filename) return NULL;
    
61.     int fd = open(filename, O_RDONLY);
    
62.     if(fd < 0) return NULL;
    
63.     struct stat stat_buf;
    
64.     fstat(fd, &stat_buf);
    
65.     uint8_t *bmp_file = mmap(NULL, stat_buf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
    
66.     if(bmp_file == MAP_FAILED) {
    
67.         close(fd); return NULL;
    
68.     }
    
69.     bmp_t bmp = parse_bmp(bmp_file);
    
70.     munmap(bmp_file, stat_buf.st_size);
    
71.     close(fd);
    
72.     return bmp;
    
73. }
    
74. 
    
75. void bmp_deinit(bmp_t bmp) {
    
76.     if(bmp) free(bmp->data);
    
77.     free(bmp);
    
78. }
    
79. 
    
80. uint32_t bmp_get_pixel(const bmp_t bmp, size_t x, size_t y) {
    
81.     if(!(x < bmp->width && y < bmp->height)) return 0;
    
82.     return ((uint32_t *)bmp->data)[y * bmp->width + x];
    
83. }
    

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main.c

1. #include "bmp.h"
   
2. #include <SDL.h>
   
3. 
   
4. int main(void) {
   
5.     bmp_t bmp = bmp_init("pic.bmp");
   
6.     SDL_Init(SDL_INIT_EVERYTHING);
   
7.     SDL_Window *win = SDL_CreateWindow("hello world", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, \
   
8.             bmp->width, bmp->height, SDL_WINDOW_SHOWN);
   
9.     SDL_Renderer *ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
   
10.     for(size_t h = 0; h < bmp->height; ++h) {
    
11.         for(size_t w = 0; w < bmp->width; ++w) {
    
12.             uint32_t pixel = bmp_get_pixel(bmp, w, h);
    
13.             uint8_t a = (pixel >> 24) & 0xff;
    
14.             uint8_t r = (pixel >> 16) & 0xff;
    
15.             uint8_t g = (pixel >> 8) & 0xff;
    
16.             uint8_t b = (pixel >> 0) & 0xff;
    
17.             SDL_SetRenderDrawColor(ren, r, g, b, a);
    
18.             SDL_RenderDrawPoint(ren, w, h);
    
19.         }
    
20.     }
    
21.     SDL_RenderPresent(ren);
    
22.     SDL_Delay(3000);
    
23.     SDL_DestroyRenderer(ren);
    
24.     SDL_DestroyWindow(win);
    
25.     SDL_Quit();
    
26.     bmp_deinit(bmp);
    
27.     return 0;
    
28. }
    

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