rainbowstream/c_image.py

   1 from PIL import Image
   2 from os.path import join, dirname, getmtime, exists, expanduser
   3 from .config import *
   4 from .py3patch import *
   5
   6 import ctypes
   7 import sys
   8 import os
   9
  10
  11 def call_c():
  12     """
  13     Call the C program for converting RGB to Ansi colors
  14     """
  15     library = expanduser('~/.image.so')
  16     sauce = join(dirname(__file__), 'image.c')
  17     if not exists(library) or getmtime(sauce) > getmtime(library):
  18         build = "cc -fPIC -shared -o %s %s" % (library, sauce)
  19         os.system(build + " >/dev/null 2>&1")
  20     image_c = ctypes.cdll.LoadLibrary(library)
  21     image_c.init()
  22     return image_c.rgb_to_ansi
  23
  24 rgb2short = call_c()
  25
  26
  27 def pixel_print(ansicolor):
  28     """
  29     Print a pixel with given Ansi color
  30     """
  31     sys.stdout.write('\033[48;5;%sm \033[0m' % (ansicolor))
  32
  33
  34 def block_print(lower, higher):
  35     """
  36     Print two pixels arranged above each other with Ansi color.
  37     Abuses Unicode to print two pixels in the space of one terminal block.
  38     """
  39     sys.stdout.write('\033[38;5;%sm\033[48;5;%sm▄\033[0m' % (higher, lower))
  40
  41
  42 def image_to_display(path, start=None, length=None):
  43     """
  44     Display an image
  45     """
  46     rows, columns = os.popen('stty size', 'r').read().split()
  47     if not start:
  48         start = c['IMAGE_SHIFT']
  49     if not length:
  50         length = int(columns) - 2 * start
  51     i = Image.open(path)
  52     i = i.convert('RGBA')
  53     w, h = i.size
  54     i.load()
  55     width = min(w, length)
  56     height = int(float(h) * (float(width) / float(w)))
  57     i = i.resize((width, height), Image.ANTIALIAS)
  58     height = min(height, c['IMAGE_MAX_HEIGHT'])
  59
  60     for real_y in xrange(height // 2):
  61         sys.stdout.write(' ' * start)
  62         for x in xrange(width):
  63             y = real_y * 2
  64             p0 = i.getpixel((x, y))
  65             p1 = i.getpixel((x, y+1))
  66             r0, g0, b0 = p0[:3]
  67             r1, g1, b1 = p1[:3]
  68             block_print(rgb2short(r0, g0, b0), rgb2short(r1, g1, b1))
  69         sys.stdout.write('\n')
  70
  71
  72 """
  73 For direct using purpose
  74 """
  75 if __name__ == '__main__':
  76     image_to_display(sys.argv[1])