1 #include <cstdio> 2 #include <cstring> 3 #include <stdint.h> 4 #include <windows.h> 5 int32_t width,height; 6 RGBQUAD *pixels; 7 bool OpenBitmap(char const *filename) 8 { 9 FILE *file = fopen(filename, "rb"); 10 if (file) 11 { 12 width=0; 13 height=0; 14 BITMAPFILEHEADER bf; 15 BITMAPINFOHEADER bi; 16 fread(&bf, sizeof(bf), 1, file); 17 fread(&bi, sizeof(bi), 1, file); 18 if(bi.biBitCount!=24) 19 return false; 20 if(bi.biCompression!=BI_RGB) 21 return false; 22 width=bi.biWidth; 23 height=bi.biHeight; 24 pixels=new RGBQUAD[width*height]; 25 uint32_t rowSize = (bi.biBitCount * width + 31) / 32 * 4; 26 uint8_t *line = new uint8_t[rowSize]; 27 for (int y = 0; y < height; y++) 28 { 29 fread(line, rowSize, 1, file); 30 for (int x = 0; x < width; x++) 31 { 32 uint8_t *color = line + x * 3; 33 RGBQUAD *pixel = &pixels[(height-y-1) * width+x]; 34 pixel->rgbBlue = color[0]; 35 pixel->rgbGreen = color[1]; 36 pixel->rgbRed = color[2]; 37 } 38 } 39 delete[] line; 40 fclose(file); 41 return true; 42 } 43 return false; 44 } 45 RGBQUAD GetColor(int x, int y, int w, int h) 46 { 47 int r = 0, g = 0, b = 0; 48 for (int i = 0; i < w; i++) 49 { 50 if (i + x >= width) continue; 51 for (int j = 0; j < h; j++) 52 { 53 if (j + y >= height) continue; 54 RGBQUAD const& color = pixels[(y + j) * width + (x + i)]; 55 r += color.rgbRed; 56 g += color.rgbGreen; 57 b += color.rgbBlue; 58 } 59 } 60 return RGBQUAD{r / (w * h), g / (w * h),b / (w * h)}; 61 } 62 char ColorToCharacter(RGBQUAD const& color) 63 { 64 int brightness = (color.rgbRed + color.rgbGreen + color.rgbBlue) / 3; 65 static char const *characters = "Qo0V1;:*-. "; 66 int count = strlen(characters); 67 int span = 0xFF / count; 68 int cidx = brightness / span; 69 if (cidx == count) 70 cidx--; 71 return characters[cidx]; 72 } 73 void OutputAscii(const char* filename, int w, int h) 74 { 75 FILE *file=fopen(filename,"w"); 76 int x = width / w; 77 int y = height / h; 78 for (int i = 0; i < height; i += y) 79 { 80 for (int j = 0; j < width; j += x) 81 { 82 RGBQUAD color = GetColor(j, i, x, y); 83 fprintf(file, "%c", ColorToCharacter(color)); 84 //printf("%c", ColorToCharacter(color)); 85 } 86 fprintf(file, "\n"); 87 //printf("\n"); 88 } 89 } 90 int main() 91 { 92 if(OpenBitmap("a.bmp")) 93 OutputAscii("a.txt",width/6,height/12); 94 return 0; 95 }
时间: 2024-09-30 07:35:51