senfscons/Dia2Png.py

   1 """Dia2Png SCons Builder: Build a PNG file given a DIA file.
   2
   3 Support the specification of a scalefactor in the DIA2PNGDPI Environment variable.
   4
   5 """
   6
   7 import os
   8 import SCons.Builder
   9
  10 def dia_getSize(env,source):
  11     size = None
  12     for line in os.popen(env['DIACOM']+" -e /proc/self/fd/1 -t eps "+str(source[0]),"r"):
  13         if line.startswith("%%BoundingBox:"):
  14             size=map(int,line.split()[3:])
  15             break
  16     return size
  17
  18 def dia2png_generator(source, target, env, for_signature):
  19     if for_signature:
  20         return "$DIACOM -t png -s $DIA2PNGDPI,$DIA2PNGMAXWIDTH $TARGET $SOURCE"
  21     size = dia_getSize(env,source)
  22     if not size: return None;
  23     size[0] = size[0]*int(env['DIA2PNGDPI'])/72
  24     size[1] = size[1]*int(env['DIA2PNGDPI'])/72
  25     if size[0] > env['DIA2PNGMAXWIDTH']:
  26         size[1] = size[1]*env['DIA2PNGMAXWIDTH']/size[0]
  27         size[0] = env['DIA2PNGMAXWIDTH']
  28     return env.Action("$DIACOM -t png -s %dx%d -e $TARGET $SOURCE" % tuple(size))
  29
  30 Dia2Png = SCons.Builder.Builder(suffix = ".png",
  31                                 src_suffix = ".dia",
  32                                 generator = dia2png_generator,
  33                                 single_source = 1)
  34
  35 def generate(env):
  36     env['BUILDERS']['Dia2Png'] = Dia2Png
  37     env['DIACOM'] = "dia"
  38     env['DIA2PNGDPI'] = 115
  39     env['DIA2PNGMAXWIDTH'] = 800
  40
  41 def exists(env):
  42     return env.Detect("dia")