host-tools/rendering/textrun.py

   1 #!/usr/bin/env python
   2
   3
   4 class TextRun:
   5     """
   6     A run of text...
   7     """
   8     def __init__(self, glyph):
   9         self.x = glyph['x']
  10         self.y = glyph['y']
  11         self.font = glyph['font']
  12         self.glyphs = []
  13
  14     def add_glyph(self, glyph):
  15         self.glyphs.append(glyph)
  16
  17     def cmp(left, right):
  18         if left.y < right.y:
  19             return -1
  20         elif left.y > right.y:
  21             return 1
  22
  23         if left.x < right.x:
  24             return -1
  25         elif left.x > right.x:
  26             return 1
  27         return 0
  28
  29
  30
  31
  32 # Load glyphs... share this with render_text.py
  33 def load(file):
  34     glyphs = []
  35     for line in file:
  36         split = line.strip().split(',')
  37
  38
  39         glyph = { 'x'     : int(split[0]),
  40             'y'     : int(split[1]),
  41             'font'  : split[2],
  42             'glyph' : split[3] }
  43         glyphs.append(glyph)
  44
  45     return glyphs
  46
  47
  48 def generate_text_runs(glyphs, WIDTH):
  49     text_runs = []
  50     current = None
  51     last_glyph = None
  52
  53     last_x = 0
  54     last_y = 0
  55     skip_paragraph = False
  56
  57     # Two passes....
  58     for glyph in glyphs:
  59         if glyph['x'] == 0 and glyph['y'] == 0 and glyph['font'] == '0' and glyph['glyph'] == '0':
  60             if skip_paragraph:
  61                 print "Skipping paragraph due text being drawn over itself."
  62             if current.x > WIDTH:
  63                 print "Skipping due too large x position"
  64             else:
  65                 current.first_x = current.x - last_x
  66                 if current.first_x < 0:
  67                     current.first_x = (WIDTH - last_x) + current.x
  68                 assert current.first_x >= 0
  69                 current.first_y = current.y - last_y
  70                 text_runs.append(current)
  71                 last_y = current.y
  72                 if len(current.glyphs) != 0:
  73                     last_x = current.glyphs[-1]['x']
  74                     assert last_x <= WIDTH
  75
  76             current = None
  77             last_glyph = None
  78             skip_paragraph = False
  79             continue
  80         elif skip_paragraph:
  81             continue
  82         elif last_glyph and last_glyph['x'] == glyph['x']:
  83             skip_paragraph = True
  84             continue
  85
  86
  87         if not current:
  88             current = TextRun(glyph)
  89
  90         if glyph['x'] < WIDTH:
  91             current.add_glyph(glyph)
  92         else:
  93             print "Omitting glyph due being out of space", glyph
  94
  95         last_glyph = glyph
  96
  97     if current:
  98         text_runs.append(current)
  99         current = None
 100
 101     return text_runs
 102