mirror of
https://github.com/python-pillow/Pillow.git
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0b178edbc8
This pull request adds support for languages that require complex text layout. We are using the Raqm library, that wraps FriBidi (for bidirectional text support) and HarfBuzz (for text shaping), and does proper BiDi and script itemization: https://github.com/HOST-Oman/libraqm This should fix #1089.
369 lines
13 KiB
Python
369 lines
13 KiB
Python
#
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# The Python Imaging Library
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# $Id$
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#
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# drawing interface operations
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#
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# History:
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# 1996-04-13 fl Created (experimental)
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# 1996-08-07 fl Filled polygons, ellipses.
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# 1996-08-13 fl Added text support
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# 1998-06-28 fl Handle I and F images
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# 1998-12-29 fl Added arc; use arc primitive to draw ellipses
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# 1999-01-10 fl Added shape stuff (experimental)
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# 1999-02-06 fl Added bitmap support
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# 1999-02-11 fl Changed all primitives to take options
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# 1999-02-20 fl Fixed backwards compatibility
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# 2000-10-12 fl Copy on write, when necessary
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# 2001-02-18 fl Use default ink for bitmap/text also in fill mode
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# 2002-10-24 fl Added support for CSS-style color strings
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# 2002-12-10 fl Added experimental support for RGBA-on-RGB drawing
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# 2002-12-11 fl Refactored low-level drawing API (work in progress)
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# 2004-08-26 fl Made Draw() a factory function, added getdraw() support
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# 2004-09-04 fl Added width support to line primitive
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# 2004-09-10 fl Added font mode handling
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# 2006-06-19 fl Added font bearing support (getmask2)
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#
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# Copyright (c) 1997-2006 by Secret Labs AB
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# Copyright (c) 1996-2006 by Fredrik Lundh
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#
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# See the README file for information on usage and redistribution.
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#
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import numbers
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from . import Image, ImageColor
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from ._util import isStringType
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"""
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A simple 2D drawing interface for PIL images.
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<p>
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Application code should use the <b>Draw</b> factory, instead of
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directly.
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"""
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class ImageDraw(object):
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def __init__(self, im, mode=None):
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"""
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Create a drawing instance.
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:param im: The image to draw in.
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:param mode: Optional mode to use for color values. For RGB
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images, this argument can be RGB or RGBA (to blend the
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drawing into the image). For all other modes, this argument
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must be the same as the image mode. If omitted, the mode
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defaults to the mode of the image.
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"""
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im.load()
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if im.readonly:
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im._copy() # make it writeable
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blend = 0
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if mode is None:
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mode = im.mode
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if mode != im.mode:
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if mode == "RGBA" and im.mode == "RGB":
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blend = 1
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else:
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raise ValueError("mode mismatch")
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if mode == "P":
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self.palette = im.palette
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else:
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self.palette = None
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self.im = im.im
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self.draw = Image.core.draw(self.im, blend)
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self.mode = mode
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if mode in ("I", "F"):
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self.ink = self.draw.draw_ink(1, mode)
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else:
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self.ink = self.draw.draw_ink(-1, mode)
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if mode in ("1", "P", "I", "F"):
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# FIXME: fix Fill2 to properly support matte for I+F images
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self.fontmode = "1"
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else:
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self.fontmode = "L" # aliasing is okay for other modes
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self.fill = 0
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self.font = None
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def getfont(self):
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"""Get the current default font."""
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if not self.font:
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# FIXME: should add a font repository
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from . import ImageFont
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self.font = ImageFont.load_default()
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return self.font
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def _getink(self, ink, fill=None):
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if ink is None and fill is None:
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if self.fill:
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fill = self.ink
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else:
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ink = self.ink
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else:
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if ink is not None:
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if isStringType(ink):
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ink = ImageColor.getcolor(ink, self.mode)
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if self.palette and not isinstance(ink, numbers.Number):
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ink = self.palette.getcolor(ink)
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ink = self.draw.draw_ink(ink, self.mode)
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if fill is not None:
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if isStringType(fill):
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fill = ImageColor.getcolor(fill, self.mode)
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if self.palette and not isinstance(fill, numbers.Number):
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fill = self.palette.getcolor(fill)
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fill = self.draw.draw_ink(fill, self.mode)
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return ink, fill
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def arc(self, xy, start, end, fill=None):
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"""Draw an arc."""
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ink, fill = self._getink(fill)
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if ink is not None:
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self.draw.draw_arc(xy, start, end, ink)
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def bitmap(self, xy, bitmap, fill=None):
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"""Draw a bitmap."""
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bitmap.load()
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ink, fill = self._getink(fill)
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if ink is None:
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ink = fill
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if ink is not None:
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self.draw.draw_bitmap(xy, bitmap.im, ink)
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def chord(self, xy, start, end, fill=None, outline=None):
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"""Draw a chord."""
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ink, fill = self._getink(outline, fill)
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if fill is not None:
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self.draw.draw_chord(xy, start, end, fill, 1)
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if ink is not None:
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self.draw.draw_chord(xy, start, end, ink, 0)
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def ellipse(self, xy, fill=None, outline=None):
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"""Draw an ellipse."""
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ink, fill = self._getink(outline, fill)
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if fill is not None:
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self.draw.draw_ellipse(xy, fill, 1)
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if ink is not None:
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self.draw.draw_ellipse(xy, ink, 0)
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def line(self, xy, fill=None, width=0):
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"""Draw a line, or a connected sequence of line segments."""
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ink, fill = self._getink(fill)
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if ink is not None:
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self.draw.draw_lines(xy, ink, width)
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def shape(self, shape, fill=None, outline=None):
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"""(Experimental) Draw a shape."""
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shape.close()
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ink, fill = self._getink(outline, fill)
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if fill is not None:
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self.draw.draw_outline(shape, fill, 1)
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if ink is not None:
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self.draw.draw_outline(shape, ink, 0)
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def pieslice(self, xy, start, end, fill=None, outline=None):
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"""Draw a pieslice."""
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ink, fill = self._getink(outline, fill)
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if fill is not None:
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self.draw.draw_pieslice(xy, start, end, fill, 1)
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if ink is not None:
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self.draw.draw_pieslice(xy, start, end, ink, 0)
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def point(self, xy, fill=None):
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"""Draw one or more individual pixels."""
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ink, fill = self._getink(fill)
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if ink is not None:
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self.draw.draw_points(xy, ink)
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def polygon(self, xy, fill=None, outline=None):
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"""Draw a polygon."""
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ink, fill = self._getink(outline, fill)
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if fill is not None:
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self.draw.draw_polygon(xy, fill, 1)
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if ink is not None:
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self.draw.draw_polygon(xy, ink, 0)
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def rectangle(self, xy, fill=None, outline=None):
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"""Draw a rectangle."""
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ink, fill = self._getink(outline, fill)
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if fill is not None:
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self.draw.draw_rectangle(xy, fill, 1)
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if ink is not None:
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self.draw.draw_rectangle(xy, ink, 0)
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def _multiline_check(self, text):
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"""Draw text."""
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split_character = "\n" if isinstance(text, str) else b"\n"
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return split_character in text
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def _multiline_split(self, text):
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split_character = "\n" if isinstance(text, str) else b"\n"
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return text.split(split_character)
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def text(self, xy, text, fill=None, font=None, anchor=None,
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*args, **kwargs, direction=None, features=[]):
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if self._multiline_check(text):
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return self.multiline_text(xy, text, fill, font, anchor,
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*args, **kwargs, direction=direction, features=features)
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ink, fill = self._getink(fill)
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if font is None:
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font = self.getfont()
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if ink is None:
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ink = fill
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if ink is not None:
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try:
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mask, offset = font.getmask2(text, self.fontmode, direction=direction, features=features)
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xy = xy[0] + offset[0], xy[1] + offset[1]
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except AttributeError:
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try:
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mask = font.getmask(text, self.fontmode, direction, features)
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except TypeError:
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mask = font.getmask(text)
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self.draw.draw_bitmap(xy, mask, ink)
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def multiline_text(self, xy, text, fill=None, font=None, anchor=None,
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spacing=4, align="left", direction=None, features=[]):
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widths = []
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max_width = 0
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lines = self._multiline_split(text)
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line_spacing = self.textsize('A', font=font)[1] + spacing
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for line in lines:
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line_width, line_height = self.textsize(line, font)
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widths.append(line_width)
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max_width = max(max_width, line_width)
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left, top = xy
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for idx, line in enumerate(lines):
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if align == "left":
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pass # left = x
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elif align == "center":
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left += (max_width - widths[idx]) / 2.0
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elif align == "right":
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left += (max_width - widths[idx])
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else:
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assert False, 'align must be "left", "center" or "right"'
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self.text((left, top), line, fill, font, anchor, direction=direction, features=features)
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top += line_spacing
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left = xy[0]
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def textsize(self, text, font=None, *args, **kwargs):
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"""Get the size of a given string, in pixels."""
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if self._multiline_check(text):
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return self.multiline_textsize(text, font, *args, **kwargs)
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if font is None:
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font = self.getfont()
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return font.getsize(text)
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def multiline_textsize(self, text, font=None, spacing=4):
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max_width = 0
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lines = self._multiline_split(text)
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line_spacing = self.textsize('A', font=font)[1] + spacing
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for line in lines:
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line_width, line_height = self.textsize(line, font)
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max_width = max(max_width, line_width)
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return max_width, len(lines)*line_spacing
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def Draw(im, mode=None):
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"""
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A simple 2D drawing interface for PIL images.
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:param im: The image to draw in.
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:param mode: Optional mode to use for color values. For RGB
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images, this argument can be RGB or RGBA (to blend the
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drawing into the image). For all other modes, this argument
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must be the same as the image mode. If omitted, the mode
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defaults to the mode of the image.
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"""
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try:
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return im.getdraw(mode)
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except AttributeError:
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return ImageDraw(im, mode)
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# experimental access to the outline API
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try:
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Outline = Image.core.outline
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except AttributeError:
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Outline = None
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def getdraw(im=None, hints=None):
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"""
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(Experimental) A more advanced 2D drawing interface for PIL images,
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based on the WCK interface.
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:param im: The image to draw in.
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:param hints: An optional list of hints.
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:returns: A (drawing context, drawing resource factory) tuple.
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"""
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# FIXME: this needs more work!
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# FIXME: come up with a better 'hints' scheme.
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handler = None
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if not hints or "nicest" in hints:
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try:
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from . import _imagingagg as handler
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except ImportError:
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pass
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if handler is None:
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from . import ImageDraw2 as handler
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if im:
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im = handler.Draw(im)
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return im, handler
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def floodfill(image, xy, value, border=None):
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"""
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(experimental) Fills a bounded region with a given color.
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:param image: Target image.
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:param xy: Seed position (a 2-item coordinate tuple).
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:param value: Fill color.
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:param border: Optional border value. If given, the region consists of
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pixels with a color different from the border color. If not given,
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the region consists of pixels having the same color as the seed
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pixel.
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"""
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# based on an implementation by Eric S. Raymond
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pixel = image.load()
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x, y = xy
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try:
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background = pixel[x, y]
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if background == value:
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return # seed point already has fill color
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pixel[x, y] = value
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except (ValueError, IndexError):
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return # seed point outside image
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edge = [(x, y)]
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if border is None:
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while edge:
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newedge = []
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for (x, y) in edge:
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for (s, t) in ((x+1, y), (x-1, y), (x, y+1), (x, y-1)):
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try:
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p = pixel[s, t]
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except IndexError:
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pass
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else:
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if p == background:
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pixel[s, t] = value
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newedge.append((s, t))
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edge = newedge
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else:
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while edge:
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newedge = []
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for (x, y) in edge:
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for (s, t) in ((x+1, y), (x-1, y), (x, y+1), (x, y-1)):
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try:
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p = pixel[s, t]
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except IndexError:
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pass
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else:
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if p != value and p != border:
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pixel[s, t] = value
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newedge.append((s, t))
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edge = newedge
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