def __init__(self, filename, size, atlas):
self.filename = filename
self.atlas = atlas
self.size = size
self.glyphs = {}
face = freetype.Face(self.filename)
face.set_char_size(int(size * 64))
metrics = face.size
self.ascender = metrics.ascender / 64.0
self.descender = metrics.descender / 64.0
self.height = metrics.height / 64.0
self.linegap = (self.height - self.ascender + self.descender)
freetype.set_lcd_filter(freetype.FT_LCD_FILTER_LIGHT)
def __init__(self, filename, atlas):
self._hires_size = 256
self._lowres_size = 48
self._padding = 0.125
self.filename = filename
self.atlas = atlas
self.glyphs = {}
face = freetype.Face(self.filename)
face.set_char_size(self._lowres_size * 64)
metrics = face.size
self.ascender = metrics.ascender / 64.0
self.descender = metrics.descender / 64.0
self.height = metrics.height / 64.0
self.linegap = (self.height - self.ascender + self.descender)
def load(self, charcodes=''):
face = freetype.Face(self.filename)
for charcode in charcodes:
if charcode in self.glyphs.keys():
continue
data, offset, advance = self.load_glyph(face, charcode)
h, w = data.shape
region = self.atlas.allocate((h + 2, w + 2))
if region is None:
log.warn("Cannot store glyph '%c'" % charcode)
continue
x, y, _, _ = region
x, y = x + 1, y + 1
self.atlas[y:y + h, x:x + w] = data.reshape(h, w, 1)
u0 = (x + 0.0) / float(self.atlas.width)
v0 = (y + 0.0) / float(self.atlas.height)
u1 = (x + w - 0.0) / float(self.atlas.width)
v1 = (y + h - 0.0) / float(self.atlas.height)
texcoords = (u0, v0, u1, v1)
glyph = Glyph(charcode, data.shape, offset, advance, texcoords)
self.glyphs[charcode] = glyph
# Generate kerning (for reference size)
face.set_char_size(self._lowres_size * 64)
for g in self.glyphs.values():
kerning = face.get_kerning(g.charcode,
charcode,
mode=freetype.FT_KERNING_UNFITTED)
if kerning.x != 0:
glyph.kerning[g.charcode] = kerning.x / 64.0
kerning = face.get_kerning(charcode,
g.charcode,
mode=freetype.FT_KERNING_UNFITTED)
if kerning.x != 0:
g.kerning[charcode] = kerning.x / 64.0
def load(self, charcodes=''):
'''
Build glyphs corresponding to individual characters in charcodes.
Parameters:
-----------
charcodes: [str | unicode]
Set of characters to be represented
'''
face = freetype.Face(self.filename)
pen = freetype.Vector(0, 0)
hres = 100 * 72
hscale = 1.0 / 100
for charcode in charcodes:
face.set_char_size(int(self.size * 64), 0, hres, 72)
matrix = freetype.Matrix(int((hscale) * 0x10000),
int((0.0) * 0x10000), int(
(0.0) * 0x10000), int(
(1.0) * 0x10000))
face.set_transform(matrix, pen)
if charcode in self.glyphs.keys():
continue
flags = freetype.FT_LOAD_RENDER | freetype.FT_LOAD_FORCE_AUTOHINT
flags |= freetype.FT_LOAD_TARGET_LCD
face.load_char(charcode, flags)
bitmap = face.glyph.bitmap
left = face.glyph.bitmap_left
top = face.glyph.bitmap_top
width = face.glyph.bitmap.width
rows = face.glyph.bitmap.rows
pitch = face.glyph.bitmap.pitch
w = int(width // 3)
h = rows
# h+1,w+1 to have a black border
region = self.atlas.allocate((h + 1, w + 1))
if region is None:
log.warn("Cannot store glyph '%c'" % charcode)
continue
x, y, _, _ = region
# sould be y+h+1,x+w+1 but we skip the black border
texture = self.atlas[y:y + h, x:x + w]
data = []
for i in range(rows):
data.extend(bitmap.buffer[i * pitch:i * pitch + width])
data = np.array(data, dtype=np.ubyte).reshape(h, w, 3)
texture[...] = data
# Build glyph
size = w, h
offset = left, top
advance = face.glyph.advance.x, face.glyph.advance.y
u0 = (x + 0.0) / float(self.atlas.width)
v0 = (y + 0.0) / float(self.atlas.height)
u1 = (x + w - 0.0) / float(self.atlas.width)
v1 = (y + h - 0.0) / float(self.atlas.height)
texcoords = (u0, v0, u1, v1)
glyph = Glyph(charcode, size, offset, advance, texcoords)
self.glyphs[charcode] = glyph
# Generate kerning
for g in self.glyphs.values():
# 64 * 64 because of 26.6 encoding AND the transform matrix used
# in texture_font_load_face (hres = 64)
kerning = face.get_kerning(g.charcode,
charcode,
mode=freetype.FT_KERNING_UNFITTED)
if kerning.x != 0:
glyph.kerning[g.charcode] = kerning.x / (64.0 * 64.0)
kerning = face.get_kerning(charcode,
g.charcode,
mode=freetype.FT_KERNING_UNFITTED)
if kerning.x != 0:
g.kerning[charcode] = kerning.x / (64.0 * 64.0)
