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# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
# Use OSX cocoa/quartz to get glyph bitmaps
import numpy as np
from ctypes import byref, c_int32, c_byte
from ...ext.cocoapy import cf, ct, quartz, CFRange, CFSTR, CGGlyph, UniChar, \
kCTFontFamilyNameAttribute, kCTFontBoldTrait, kCTFontItalicTrait, \
kCTFontSymbolicTrait, kCTFontTraitsAttribute, kCTFontAttributeName, \
kCGImageAlphaPremultipliedLast, kCFNumberSInt32Type, ObjCClass
from ._vispy_fonts import _vispy_fonts, _get_vispy_font_filename
_font_dict = {}
def _load_vispy_font(face, bold, italic):
# http://stackoverflow.com/questions/2703085/
# how-can-you-load-a-font-ttf-from-a-file-using-core-text
fname = _get_vispy_font_filename(face, bold, italic)
url = cf.CFURLCreateWithFileSystemPath(None, CFSTR(fname), 0, False)
# data_provider = quartz.CGDataProviderCreateWithURL(url)
# cg_font = quartz.CGFontCreateWithDataProvider(data_provider)
# font = ct.CTFontCreateWithGraphicsFont(cg_font, 12., None, None)
array = ct.CTFontManagerCreateFontDescriptorsFromURL(url)
desc = cf.CFArrayGetValueAtIndex(array, 0)
font = ct.CTFontCreateWithFontDescriptor(desc, 12., None)
cf.CFRelease(array)
cf.CFRelease(url)
if not font:
raise RuntimeError("Couldn't load font: %s" % face)
key = '%s-%s-%s' % (face, bold, italic)
_font_dict[key] = font
return font
def _load_font(face, bold, italic):
key = '%s-%s-%s' % (face, bold, italic)
if key in _font_dict:
return _font_dict[key]
if face in _vispy_fonts:
return _load_vispy_font(face, bold, italic)
traits = 0
traits |= kCTFontBoldTrait if bold else 0
traits |= kCTFontItalicTrait if italic else 0
# Create an attribute dictionary.
args = [None, 0, cf.kCFTypeDictionaryKeyCallBacks,
cf.kCFTypeDictionaryValueCallBacks]
attributes = cf.CFDictionaryCreateMutable(*args)
# Add family name to attributes.
cfname = CFSTR(face)
cf.CFDictionaryAddValue(attributes, kCTFontFamilyNameAttribute, cfname)
cf.CFRelease(cfname)
# Construct a CFNumber to represent the traits.
itraits = c_int32(traits)
sym_traits = cf.CFNumberCreate(None, kCFNumberSInt32Type, byref(itraits))
if sym_traits:
# Construct a dictionary to hold the traits values.
args = [None, 0, cf.kCFTypeDictionaryKeyCallBacks,
cf.kCFTypeDictionaryValueCallBacks]
traits_dict = cf.CFDictionaryCreateMutable(*args)
if traits_dict:
# Add CFNumber traits to traits dictionary.
cf.CFDictionaryAddValue(traits_dict, kCTFontSymbolicTrait,
sym_traits)
# Add traits dictionary to attributes.
cf.CFDictionaryAddValue(attributes, kCTFontTraitsAttribute,
traits_dict)
cf.CFRelease(traits_dict)
cf.CFRelease(sym_traits)
# Create font descriptor with attributes.
desc = ct.CTFontDescriptorCreateWithAttributes(attributes)
cf.CFRelease(attributes)
font = ct.CTFontCreateWithFontDescriptor(desc, 12., None)
if not font:
raise RuntimeError("Couldn't load font: %s" % face)
_font_dict[key] = font
return font
def _load_glyph(f, char, glyphs_dict):
font = _load_font(f['face'], f['bold'], f['italic'])
# resize loaded font
args = [None, 0, cf.kCFTypeDictionaryKeyCallBacks,
cf.kCFTypeDictionaryValueCallBacks]
attributes = cf.CFDictionaryCreateMutable(*args)
desc = ct.CTFontDescriptorCreateWithAttributes(attributes)
cf.CFRelease(attributes)
font = ct.CTFontCreateCopyWithAttributes(font, f['size'], None, desc)
cf.CFRelease(desc)
if not font:
raise RuntimeError("Couldn't load font")
# Create an attributed string using text and font.
args = [None, 1, cf.kCFTypeDictionaryKeyCallBacks,
cf.kCFTypeDictionaryValueCallBacks]
attributes = cf.CFDictionaryCreateMutable(*args)
cf.CFDictionaryAddValue(attributes, kCTFontAttributeName, font)
string = cf.CFAttributedStringCreate(None, CFSTR(char), attributes)
# Create a CTLine object to render the string.
line = ct.CTLineCreateWithAttributedString(string)
cf.CFRelease(string)
cf.CFRelease(attributes)
# Get a bounding rectangle for glyphs in string.
chars = (UniChar * 1)(*map(ord, char))
glyphs = (CGGlyph * 1)()
ct.CTFontGetGlyphsForCharacters(font, chars, glyphs, 1)
rect = ct.CTFontGetBoundingRectsForGlyphs(font, 0, glyphs, None, 1)
# Get advance for all glyphs in string.
advance = ct.CTFontGetAdvancesForGlyphs(font, 1, glyphs, None, 1)
width = max(int(np.ceil(rect.size.width) + 1), 1)
height = max(int(np.ceil(rect.size.height) + 1), 1)
left = rect.origin.x
baseline = -rect.origin.y
top = height - baseline
bits_per_component = 8
bytes_per_row = 4*width
color_space = quartz.CGColorSpaceCreateDeviceRGB()
args = [None, width, height, bits_per_component, bytes_per_row,
color_space, kCGImageAlphaPremultipliedLast]
bitmap = quartz.CGBitmapContextCreate(*args)
# Draw text to bitmap context.
quartz.CGContextSetShouldAntialias(bitmap, True)
quartz.CGContextSetTextPosition(bitmap, -left, baseline)
ct.CTLineDraw(line, bitmap)
cf.CFRelease(line)
# Create an image to get the data out.
image_ref = quartz.CGBitmapContextCreateImage(bitmap)
assert quartz.CGImageGetBytesPerRow(image_ref) == bytes_per_row
data_provider = quartz.CGImageGetDataProvider(image_ref)
image_data = quartz.CGDataProviderCopyData(data_provider)
buffer_size = cf.CFDataGetLength(image_data)
assert buffer_size == width * height * 4
buffer = (c_byte * buffer_size)()
byte_range = CFRange(0, buffer_size)
cf.CFDataGetBytes(image_data, byte_range, buffer)
quartz.CGImageRelease(image_ref)
quartz.CGDataProviderRelease(image_data)
cf.CFRelease(bitmap)
cf.CFRelease(color_space)
# reshape bitmap (don't know why it's only alpha on OSX...)
bitmap = np.array(buffer, np.ubyte)
bitmap.shape = (height, width, 4)
bitmap = bitmap[:, :, 3].copy()
glyph = dict(char=char, offset=(left, top), bitmap=bitmap,
advance=advance, kerning={})
glyphs_dict[char] = glyph
# Generate kerning
for other_char, other_glyph in glyphs_dict.items():
glyph['kerning'][other_char] = (_get_k_p_a(font, other_char, char) -
other_glyph['advance'])
other_glyph['kerning'][char] = (_get_k_p_a(font, char, other_char) -
glyph['advance'])
cf.CFRelease(font)
def _get_k_p_a(font, left, right):
"""This actually calculates the kerning + advance"""
# http://lists.apple.com/archives/coretext-dev/2010/Dec/msg00020.html
# 1) set up a CTTypesetter
chars = left + right
args = [None, 1, cf.kCFTypeDictionaryKeyCallBacks,
cf.kCFTypeDictionaryValueCallBacks]
attributes = cf.CFDictionaryCreateMutable(*args)
cf.CFDictionaryAddValue(attributes, kCTFontAttributeName, font)
string = cf.CFAttributedStringCreate(None, CFSTR(chars), attributes)
typesetter = ct.CTTypesetterCreateWithAttributedString(string)
cf.CFRelease(string)
cf.CFRelease(attributes)
# 2) extract a CTLine from it
range = CFRange(0, 1)
line = ct.CTTypesetterCreateLine(typesetter, range)
# 3) use CTLineGetOffsetForStringIndex to get the character positions
offset = ct.CTLineGetOffsetForStringIndex(line, 1, None)
cf.CFRelease(line)
cf.CFRelease(typesetter)
return offset
def _list_fonts():
manager = ObjCClass('NSFontManager').sharedFontManager()
avail = manager.availableFontFamilies()
fonts = [avail.objectAtIndex_(ii).UTF8String().decode('utf-8')
for ii in range(avail.count())]
return fonts
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