使用 libpng

需要准备好 input.bin，是一个 2048*1080/8 B 的二进制文件（内容每 1 bit 为一个像素）。

png.c:

#include <png.h>
#include <stdio.h>
#include <stdlib.h>

// [useful functions]

static const unsigned char reverse_byte[] = {
    0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0,
    0x30, 0xb0, 0x70, 0xf0, 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
    0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 0x04, 0x84, 0x44, 0xc4,
    0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
    0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc,
    0x3c, 0xbc, 0x7c, 0xfc, 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
    0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, 0x0a, 0x8a, 0x4a, 0xca,
    0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
    0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6,
    0x36, 0xb6, 0x76, 0xf6, 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
    0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 0x01, 0x81, 0x41, 0xc1,
    0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
    0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9,
    0x39, 0xb9, 0x79, 0xf9, 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
    0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 0x0d, 0x8d, 0x4d, 0xcd,
    0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
    0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3,
    0x33, 0xb3, 0x73, 0xf3, 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
    0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, 0x07, 0x87, 0x47, 0xc7,
    0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
    0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf,
    0x3f, 0xbf, 0x7f, 0xff,
};

// [parameters]

unsigned int input_width = 2048;
unsigned int input_height = 1080;
unsigned int png_width = 1920;
unsigned int png_height = 1080;
const char* input_file = "input.bin";
const char* output_file = "output.png";

int main() {
  // [read binary input]

  unsigned int input_len = input_width * input_height / 8;
  unsigned char* input = (unsigned char*)malloc(input_len);
  FILE* input_f = fopen(input_file, "rb");
  fread(input, 8, input_len, input_f);
  fclose(input_f);

  for (unsigned int i = 0; i < input_width * input_height / 8; i++) {
    input[i] = reverse_byte[input[i]];
  }

  png_bytep row_pointers[input_height];
  for (png_uint_32 k = 0; k < input_height; k++) {
    row_pointers[k] = input + k * input_width / 8;
  }

  // [png encoding]

  FILE* output_f = fopen(output_file, "wb");
  png_structp png_ptr =
      png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
  png_infop info_ptr = png_create_info_struct(png_ptr);

  png_init_io(png_ptr, output_f);
  png_set_IHDR(png_ptr, info_ptr, png_width, png_height, 1, PNG_COLOR_TYPE_GRAY,
               PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
               PNG_FILTER_TYPE_BASE);
  png_write_info(png_ptr, info_ptr);

  png_write_image(png_ptr, row_pointers);
  png_write_end(png_ptr, info_ptr);
  png_destroy_write_struct(&png_ptr, &info_ptr);
  fclose(output_f);

  return 0;
}

aarch64-himix200-linux-gcc png.c -I/home/yxj/Desktop/HiLinux/libraries/include -L/home/yxj/Desktop/HiLinux/libraries/lib -L/home/yxj/Desktop/HiLinux/libraries/lib64 -lz -lpng
mv a.out generate_png
chmod +x generate_png

注意：一定要加 -lz -lpng