rainbowstream/c_image.py

   1 # -*- coding: utf-8 -*-
   2 from PIL import Image
   3 from os.path import join, dirname, getmtime, exists, expanduser
   4 from .config import *
   5 from .py3patch import *
   6
   7 import ctypes
   8 import sys
   9 import os
  10
  11
  12 def call_c():
  13     """
  14     Call the C program for converting RGB to Ansi colors
  15     """
  16     library = expanduser('~/.image.so')
  17     sauce = join(dirname(__file__), 'image.c')
  18     if not exists(library) or getmtime(sauce) > getmtime(library):
  19         build = "cc -fPIC -shared -o %s %s" % (library, sauce)
  20         os.system(build + " >/dev/null 2>&1")
  21     image_c = ctypes.cdll.LoadLibrary(library)
  22     image_c.init()
  23     return image_c.rgb_to_ansi
  24
  25 rgb2short = call_c()
  26
  27
  28 def pixel_print(pixel):
  29     """
  30     Print a pixel with given Ansi color
  31     """
  32     r, g, b = pixel[:3]
  33
  34     if c['24BIT'] is True:
  35         sys.stdout.write('\033[48;2;%d;%d;%dm \033[0m'
  36                          % (r, g, b))
  37     else:
  38         ansicolor = rgb2short(r, g, b)
  39         sys.stdout.write('\033[48;5;%sm \033[0m' % (ansicolor))
  40
  41
  42 def block_print(higher, lower):
  43     """
  44     Print two pixels arranged above each other with Ansi color.
  45     Abuses Unicode to print two pixels in the space of one terminal block.
  46     """
  47     r0, g0, b0 = lower[:3]
  48     r1, g1, b1 = higher[:3]
  49
  50     if c['24BIT'] is True:
  51         sys.stdout.write('\033[38;2;%d;%d;%dm\033[48;2;%d;%d;%dm▄\033[0m'
  52                          % (r1, g1, b1, r0, g0, b0))
  53     else:
  54         i0 = rgb2short(r0, g0, b0)
  55         i1 = rgb2short(r1, g1, b1)
  56         sys.stdout.write('\033[38;5;%sm\033[48;5;%sm▄\033[0m' % (i1, i0))
  57
  58
  59 def image_to_display(path, start=None, length=None):
  60     """
  61     Display an image
  62     """
  63     rows, columns = os.popen('stty size', 'r').read().split()
  64     if not start:
  65         start = c['IMAGE_SHIFT']
  66     if not length:
  67         length = int(columns) - 2 * start
  68     i = Image.open(path)
  69     i = i.convert('RGBA')
  70     w, h = i.size
  71     i.load()
  72     width = min(w, length)
  73     height = int(float(h) * (float(width) / float(w)))
  74     i = i.resize((width, height), Image.ANTIALIAS)
  75     height = min(height, c['IMAGE_MAX_HEIGHT'])
  76
  77     for real_y in xrange(height // 2):
  78         sys.stdout.write(' ' * start)
  79         for x in xrange(width):
  80             y = real_y * 2
  81             p0 = i.getpixel((x, y))
  82             p1 = i.getpixel((x, y+1))
  83             block_print(p1, p0)
  84         sys.stdout.write('\n')
  85
  86     # Old code for display one pixel on one terminal block
  87     # for y in xrange(height):
  88     #     sys.stdout.write(' ' * start)
  89     #     for x in xrange(width):
  90     #         p = i.getpixel((x, y))
  91     #         pixel_print(p)
  92     #     sys.stdout.write('\n')
  93
  94
  95 """
  96 For direct using purpose
  97 """
  98 if __name__ == '__main__':
  99     image_to_display(sys.argv[1])