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355 lines
12 KiB
Python
355 lines
12 KiB
Python
# ----------------------------------------------------------------------------
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# pyglet
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# Copyright (c) 2006-2008 Alex Holkner
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of pyglet nor the names of its
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# contributors may be used to endorse or promote products
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# derived from this software without specific prior written
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# permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# ----------------------------------------------------------------------------
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'''
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'''
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__docformat__ = 'restructuredtext'
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__version__ = '$Id: freetype.py 2084 2008-05-27 12:42:19Z Alex.Holkner $'
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import ctypes
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from ctypes import *
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from warnings import warn
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import pyglet.lib
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from pyglet.font import base
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from pyglet import image
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from pyglet.font.freetype_lib import *
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# fontconfig library definitions
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fontconfig = pyglet.lib.load_library('fontconfig')
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FcResult = c_int
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fontconfig.FcPatternBuild.restype = c_void_p
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fontconfig.FcFontMatch.restype = c_void_p
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fontconfig.FcFreeTypeCharIndex.restype = c_uint
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FC_FAMILY = 'family'
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FC_SIZE = 'size'
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FC_SLANT = 'slant'
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FC_WEIGHT = 'weight'
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FC_FT_FACE = 'ftface'
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FC_FILE = 'file'
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FC_WEIGHT_REGULAR = 80
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FC_WEIGHT_BOLD = 200
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FC_SLANT_ROMAN = 0
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FC_SLANT_ITALIC = 100
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FT_STYLE_FLAG_ITALIC = 1
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FT_STYLE_FLAG_BOLD = 2
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(FT_RENDER_MODE_NORMAL,
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FT_RENDER_MODE_LIGHT,
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FT_RENDER_MODE_MONO,
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FT_RENDER_MODE_LCD,
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FT_RENDER_MODE_LCD_V) = range(5)
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def FT_LOAD_TARGET_(x):
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return (x & 15) << 16
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FT_LOAD_TARGET_NORMAL = FT_LOAD_TARGET_(FT_RENDER_MODE_NORMAL)
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FT_LOAD_TARGET_LIGHT = FT_LOAD_TARGET_(FT_RENDER_MODE_LIGHT)
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FT_LOAD_TARGET_MONO = FT_LOAD_TARGET_(FT_RENDER_MODE_MONO)
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FT_LOAD_TARGET_LCD = FT_LOAD_TARGET_(FT_RENDER_MODE_LCD)
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FT_LOAD_TARGET_LCD_V = FT_LOAD_TARGET_(FT_RENDER_MODE_LCD_V)
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(FT_PIXEL_MODE_NONE,
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FT_PIXEL_MODE_MONO,
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FT_PIXEL_MODE_GRAY,
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FT_PIXEL_MODE_GRAY2,
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FT_PIXEL_MODE_GRAY4,
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FT_PIXEL_MODE_LCD,
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FT_PIXEL_MODE_LCD_V) = range(7)
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(FcTypeVoid,
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FcTypeInteger,
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FcTypeDouble,
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FcTypeString,
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FcTypeBool,
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FcTypeMatrix,
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FcTypeCharSet,
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FcTypeFTFace,
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FcTypeLangSet) = range(9)
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FcType = c_int
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(FcMatchPattern,
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FcMatchFont) = range(2)
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FcMatchKind = c_int
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class _FcValueUnion(Union):
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_fields_ = [
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('s', c_char_p),
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('i', c_int),
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('b', c_int),
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('d', c_double),
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('m', c_void_p),
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('c', c_void_p),
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('f', c_void_p),
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('p', c_void_p),
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('l', c_void_p),
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]
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class FcValue(Structure):
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_fields_ = [
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('type', FcType),
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('u', _FcValueUnion)
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]
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# End of library definitions
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def f16p16_to_float(value):
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return float(value) / (1 << 16)
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def float_to_f16p16(value):
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return int(value * (1 << 16))
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def f26p6_to_float(value):
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return float(value) / (1 << 6)
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def float_to_f26p6(value):
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return int(value * (1 << 6))
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class FreeTypeGlyphRenderer(base.GlyphRenderer):
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def __init__(self, font):
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super(FreeTypeGlyphRenderer, self).__init__(font)
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self.font = font
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def render(self, text):
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face = self.font.face
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FT_Set_Char_Size(face, 0, self.font._face_size,
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self.font._dpi, self.font._dpi)
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glyph_index = fontconfig.FcFreeTypeCharIndex(byref(face), ord(text[0]))
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error = FT_Load_Glyph(face, glyph_index, FT_LOAD_RENDER)
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if error != 0:
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raise base.FontException(
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'Could not load glyph for "%c"' % text[0], error)
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glyph_slot = face.glyph.contents
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width = glyph_slot.bitmap.width
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height = glyph_slot.bitmap.rows
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baseline = height - glyph_slot.bitmap_top
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lsb = glyph_slot.bitmap_left
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advance = int(f26p6_to_float(glyph_slot.advance.x))
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mode = glyph_slot.bitmap.pixel_mode
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pitch = glyph_slot.bitmap.pitch
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if mode == FT_PIXEL_MODE_MONO:
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# BCF fonts always render to 1 bit mono, regardless of render
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# flags. (freetype 2.3.5)
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bitmap_data = cast(glyph_slot.bitmap.buffer,
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POINTER(c_ubyte * (pitch * height))).contents
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data = (c_ubyte * (pitch * 8 * height))()
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data_i = 0
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for byte in bitmap_data:
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# Data is MSB; left-most pixel in a byte has value 128.
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data[data_i + 0] = (byte & 0x80) and 255 or 0
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data[data_i + 1] = (byte & 0x40) and 255 or 0
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data[data_i + 2] = (byte & 0x20) and 255 or 0
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data[data_i + 3] = (byte & 0x10) and 255 or 0
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data[data_i + 4] = (byte & 0x08) and 255 or 0
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data[data_i + 5] = (byte & 0x04) and 255 or 0
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data[data_i + 6] = (byte & 0x02) and 255 or 0
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data[data_i + 7] = (byte & 0x01) and 255 or 0
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data_i += 8
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pitch <<= 3
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elif mode == FT_PIXEL_MODE_GRAY:
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# Usual case
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data = glyph_slot.bitmap.buffer
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else:
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raise base.FontException('Unsupported render mode for this glyph')
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# pitch should be negative, but much faster to just swap tex_coords
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img = image.ImageData(width, height, 'A', data, pitch)
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glyph = self.font.create_glyph(img)
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glyph.set_bearings(baseline, lsb, advance)
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t = list(glyph.tex_coords)
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glyph.tex_coords = t[9:12] + t[6:9] + t[3:6] + t[:3]
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return glyph
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class FreeTypeMemoryFont(object):
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def __init__(self, data):
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self.buffer = (ctypes.c_byte * len(data))()
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ctypes.memmove(self.buffer, data, len(data))
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ft_library = ft_get_library()
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self.face = FT_Face()
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r = FT_New_Memory_Face(ft_library,
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self.buffer, len(self.buffer), 0, self.face)
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if r != 0:
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raise base.FontException('Could not load font data')
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self.name = self.face.contents.family_name
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self.bold = self.face.contents.style_flags & FT_STYLE_FLAG_BOLD != 0
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self.italic = self.face.contents.style_flags & FT_STYLE_FLAG_ITALIC != 0
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# Replace Freetype's generic family name with TTF/OpenType specific
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# name if we can find one; there are some instances where Freetype
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# gets it wrong.
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if self.face.contents.face_flags & FT_FACE_FLAG_SFNT:
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name = FT_SfntName()
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for i in range(FT_Get_Sfnt_Name_Count(self.face)):
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result = FT_Get_Sfnt_Name(self.face, i, name)
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if result != 0:
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continue
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if not (name.platform_id == TT_PLATFORM_MICROSOFT and
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name.encoding_id == TT_MS_ID_UNICODE_CS):
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continue
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if name.name_id == TT_NAME_ID_FONT_FAMILY:
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string = string_at(name.string, name.string_len)
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self.name = string.decode('utf-16be', 'ignore')
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def __del__(self):
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try:
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FT_Done_Face(self.face)
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except:
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pass
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class FreeTypeFont(base.Font):
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glyph_renderer_class = FreeTypeGlyphRenderer
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# Map font (name, bold, italic) to FreeTypeMemoryFont
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_memory_fonts = {}
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def __init__(self, name, size, bold=False, italic=False, dpi=None):
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super(FreeTypeFont, self).__init__()
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if dpi is None:
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dpi = 96 # as of pyglet 1.1; pyglet 1.0 had 72.
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# Check if font name/style matches a font loaded into memory by user
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lname = name and name.lower() or ''
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if (lname, bold, italic) in self._memory_fonts:
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font = self._memory_fonts[lname, bold, italic]
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self._set_face(font.face, size, dpi)
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return
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# Use fontconfig to match the font (or substitute a default).
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ft_library = ft_get_library()
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match = self.get_fontconfig_match(name, size, bold, italic)
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if not match:
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raise base.FontException('Could not match font "%s"' % name)
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f = FT_Face()
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if fontconfig.FcPatternGetFTFace(match, FC_FT_FACE, 0, byref(f)) != 0:
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value = FcValue()
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result = fontconfig.FcPatternGet(match, FC_FILE, 0, byref(value))
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if result != 0:
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raise base.FontException('No filename or FT face for "%s"' % \
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name)
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result = FT_New_Face(ft_library, value.u.s, 0, byref(f))
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if result:
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raise base.FontException('Could not load "%s": %d' % \
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(name, result))
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fontconfig.FcPatternDestroy(match)
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self._set_face(f, size, dpi)
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def _set_face(self, face, size, dpi):
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self.face = face.contents
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self._face_size = float_to_f26p6(size)
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self._dpi = dpi
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FT_Set_Char_Size(self.face, 0, float_to_f26p6(size), dpi, dpi)
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metrics = self.face.size.contents.metrics
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if metrics.ascender == 0 and metrics.descender == 0:
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# Workaround broken fonts with no metrics. Has been observed with
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# courR12-ISO8859-1.pcf.gz: "Courier" "Regular"
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#
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# None of the metrics fields are filled in, so render a glyph and
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# grab its height as the ascent, and make up an arbitrary
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# descent.
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i = fontconfig.FcFreeTypeCharIndex(byref(self.face), ord('X'))
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FT_Load_Glyph(self.face, i, FT_LOAD_RENDER)
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self.ascent = self.face.available_sizes.contents.height
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self.descent = -self.ascent // 4 # arbitrary.
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else:
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self.ascent = int(f26p6_to_float(metrics.ascender))
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self.descent = int(f26p6_to_float(metrics.descender))
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@staticmethod
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def get_fontconfig_match(name, size, bold, italic):
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if bold:
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bold = FC_WEIGHT_BOLD
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else:
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bold = FC_WEIGHT_REGULAR
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if italic:
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italic = FC_SLANT_ITALIC
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else:
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italic = FC_SLANT_ROMAN
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fontconfig.FcInit()
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if isinstance(name, unicode):
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name = name.encode('utf8')
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pattern = fontconfig.FcPatternCreate()
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fontconfig.FcPatternAddDouble(pattern, FC_SIZE, c_double(size))
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fontconfig.FcPatternAddInteger(pattern, FC_WEIGHT, bold)
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fontconfig.FcPatternAddInteger(pattern, FC_SLANT, italic)
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fontconfig.FcPatternAddString(pattern, FC_FAMILY, name)
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fontconfig.FcConfigSubstitute(0, pattern, FcMatchPattern)
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fontconfig.FcDefaultSubstitute(pattern)
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# Look for a font that matches pattern
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result = FcResult()
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match = fontconfig.FcFontMatch(0, pattern, byref(result))
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fontconfig.FcPatternDestroy(pattern)
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return match
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@classmethod
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def have_font(cls, name):
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value = FcValue()
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match = cls.get_fontconfig_match(name, 12, False, False)
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result = fontconfig.FcPatternGet(match, FC_FAMILY, 0, byref(value))
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if value.u.s == name:
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return True
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else:
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name = name.lower()
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for font in cls._memory_fonts.values():
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if font.name.lower() == name:
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return True
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return False
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@classmethod
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def add_font_data(cls, data):
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font = FreeTypeMemoryFont(data)
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cls._memory_fonts[font.name.lower(), font.bold, font.italic] = font
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