"""
Copyright @ 2013 Mathias Westerdahl
This is the default rendering of the fonts
.. py:attribute:: texturesize = 512, 512
The desired size of the texture. If it's too small, the creator will fail.
.. py:attribute:: textureoffset = 0, 0
The offset from the top left corner of the texture to the top left corner of the first glyph.
It is used to create a border around the texture. The same border is also applied on the right/bottom sides.
.. py:attribute:: usepremultipliedalpha = 0
If set, will premultiply the alpha
"""
import logging
import numpy as np
from fontutils import FontException
import binpack
DEBUG=False
def _guess_dimensions(glyphs):
area = 0
for glyph in glyphs:
if glyph.bitmap is None:
continue
w, h, d = glyph.bitmap.shape
area += w*h
#area += area / 1
gw = 512
gh = 64
guess = gw * gh
while guess < area:
if gh >= gw:
gw *= 2
gh /= 2
else:
gh *= 2
guess = gw * gh
return (gw, gh)
def _create_image(info, w, h):
image = np.ones( (w, h, 4), np.float64)
image[:, :, 0] *= info.bgcolor[0]
image[:, :, 1] *= info.bgcolor[1]
image[:, :, 2] *= info.bgcolor[2]
image[:, :, 3] *= 0
return image
def _glyph_cmp(a, b):
if a.bitmap is None and b.bitmap is not None:
return 1
elif b.bitmap is None and a.bitmap is not None:
return -1
elif b.bitmap is None and a.bitmap is None:
return cmp(a, b)
return a.bitmap.shape[1] - b.bitmap.shape[1]
[docs]def render(info):
""" Assuming (0,0) is at the top left corner of the image.
:param info: The settings from the fontinfo file
:return: The image all glyphs are rendered to
"""
# sort the glyphs
info.glyphs.sort(cmp=_glyph_cmp)
# Work in progress
#iw, ih = _guess_dimensions(info.glyphs)
iw, ih = info.texturesize
#ih /= 2
#print "guessed image size", iw, ih
image = _create_image(info, iw, ih)
textureoffset = info.textureoffset
padding = info.padding
packer = binpack.create_packer(binpack.SKYLINE_BL, iw - textureoffset[0], ih - textureoffset[1], False)
# DEBUG PACK RENDERING
if DEBUG:
image[:, :, 0] = 1.0
image[:, :, 3] = 1.0
for glyph in info.glyphs:
if glyph.bitmap is None:
continue
bitmap = glyph.bitmap
w, h, d = bitmap.shape
rect = binpack.pack_rect(packer, w + padding, h + padding)
if rect.height == 0:
raise FontException("The texture size is too small: (%d, %d) Increase the 'texturesize' property in the font info" % (info.texturesize[0], info.texturesize[1]) )
rect.x += textureoffset[0]
rect.y += textureoffset[1]
rect.width -= padding
rect.height -= padding
glyph.bitmapbox = (rect.x, rect.y, rect.width, rect.height)
# check if the glyph has been flipped
if w != h and w == rect.height:
bitmap = np.rot90(bitmap)
try:
image[ rect.x : rect.x + rect.width, rect.y : rect.y + rect.height ] = bitmap
# DEBUG PACK RENDERING
if DEBUG:
import fontutils
top = image[ rect.x : rect.x + rect.width, rect.y : rect.y + rect.height ]
ones = np.ones( (top.shape[0], top.shape[1]) )
from random import random
r = random() * 0.4 + 0.6
g = random() * 0.4 + 0.6
b = random() * 0.4 + 0.6
a = 1.0
bottom = np.dstack( (ones * r, ones * g, ones * b, ones * a) )
result = fontutils.alpha_blend(bottom, top)
image[ rect.x : rect.x + rect.width, rect.y : rect.y + rect.height ] = result
except Exception, e:
print "ERROR", e
print "RECT", rect
#print "bmshape", (bx,by,w,h)
print "image.shape", image.shape
print "char.bitmap.shape", glyph.bitmap.shape
raise
#x += max(w, w2) + info.padding + info.internalpadding[0]*2
logging.debug('Used %f %% of the texture', (binpack.get_occupancy(packer) * 100))
binpack.destroy_packer(packer)
if info.usepremultipliedalpha:
image = fontutils.pre_multiply_alpha(image)
return image
