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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. void
  5. convert_pixels(unsigned char *pixdata, unsigned char *convertedpix,
  6.                int width, int height) {
  7.     int i, j, k;
  8.     unsigned int mask;
  9.     unsigned char temp;
  10.     for(i = 0; i < height; ++i) {
  11.         for(j = 0; j < width; ++j) {
  12.             k = 0;
  13.             temp = *(pixdata + i * width + j);
  14.             for (mask = 0x80; mask != 0; mask >>= 1) {
  15.                 if (mask != 0x10 && mask != 0x01) { /* code below will be 
  16.                                                      * executed 6 times */
  17.                     if (temp & mask) { 
  18.                         *(convertedpix + i * width + k) = 0xFF;
  19.                     } else {
  20.                         *(convertedpix + i * width + k) = 0;
  21.                     }
  22.                     ++k;
  23.                 }
  24.             }
  25.         }
  26.     }
  27. }
  28.  
  29. int main(void) {
  30. 	// your code goes here
  31. 	size_t h, w;
  32. 	unsigned char *pix, *conv_pix;
  33. 	h = 100;
  34. 	w = 200;
  35. 	pix = malloc(h * w * sizeof(unsigned char));
  36. 	if (pix == NULL) {
  37. 		perror("malloc failed for pix array");
  38. 	}
  39. 	conv_pix = calloc(h * w * 6,  sizeof(unsigned char));
  40. 	if (conv_pix == NULL) {
  41. 		free(pix);
  42. 		perror("calloc failed for convpix array");
  43. 	}
  44. 	convert_pixels(pix, conv_pix, w, h);
  45. 	free(pix);
  46. 	free(conv_pix);
  47.  
  48. 	return 0;
  49. }
  50.  
Success #stdin #stdout 0s 2284KB
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https://ideone.com/DTt4Ym
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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