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SvgImagePlugin.py
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SvgImagePlugin.py
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from PIL import Image, ImageDraw, ImageFont, ImageColor, ImageFile
from typing import Type, Tuple, Dict, List, Union
import math
from xml.etree.ElementTree import XMLParser
from functools import reduce
# font-family//font-weight//font-style -> path
font_mapping: Dict[str, str] = {}
svg_default_size = 480, 480
svg_default_background = "#FFFFFF"
def register_font(path: str, family: str, weight: str = "normal", style: str = "normal"):
font_mapping["%s//%s//%s" % (family, weight, style)] = path
pass
def set_svg_default(size: Tuple[int, int], background: str):
svg_default_size = size
svg_default_background = background
class SvgPainter:
"""
Basic SVG support
SVG 1.1 specification - https://www.w3.org/TR/SVG11/
"""
svgns = "http://www.w3.org/2000/svg"
finished = False
def dump(self, obj):
for attr in dir(obj):
print("obj.%s = %r" % (attr, getattr(obj, attr)))
def apply_transform(self, x, y, transforms: List[Tuple[str, List[str]]]):
for (op, params) in reversed(transforms):
if op == "scale":
[x, y, zz] = self.apply_matrix(self.matrix(float(params[0]), 0.0, 0.0, float(params[1]) if len(params) > 1 else float(params[0]), 0.0, 0.0), [x, y, 1.0])
if op == "translate":
[x, y, zz] = self.apply_matrix(self.matrix(1.0, 0.0, 0.0, 1.0, float(params[0]), float(params[1]) if len(params) > 1 else 0), [x, y, 1.0])
if op == "matrix":
[x, y, zz] = self.apply_matrix(self.matrix(float(params[0]), float(params[1]), float(params[2]), float(params[3]), float(params[4]), float(params[5])), [x, y, 1.0])
if op == "rotate":
a = float(params[0])
[x, y, zz] = self.apply_matrix(self.matrix(math.cos(a), math.sin(a), -math.sin(a), math.cos(a), 0, 0), [x, y, 1.0])
# print (op, params, x, y)
return (x, y)
def get_coords(self, x, y):
x = float(x)
y = float(y)
for (tag, attrib) in reversed(self.tagstack):
if "transform" in attrib:
transforms = self.parse_transform(attrib["transform"])
(x, y) = self.apply_transform(x, y, transforms)
# project from viewBox
x = (x - self.svgviewbox[0]) * (self.svgsize[0] / self.svgviewbox[2])
y = (y - self.svgviewbox[1]) * (self.svgsize[1] / self.svgviewbox[3])
return (x, y)
def get_opacity(self):
opacity = 1.0
for (tag, attrib) in reversed(self.tagstack):
if "opacity" in attrib:
opacity = opacity * float(attrib["opacity"])
return opacity
def get_scale(self):
return (self.svgsize[1] / self.svgviewbox[3])
def get_attribute(self, key: str, default: str, inheritParent: bool):
for (tag, attrib) in reversed(self.tagstack):
if key in attrib:
return attrib[key]
if not inheritParent:
return default
return default
def matrix(self, a: float, b: float, c: float, d: float, e: float, f: float):
return [[a, c, e], [b, d, f], [0.0, 0.0, 1.0]]
def apply_matrix(self, matrix, old):
return [matrix[0][0] * old[0]+ matrix[0][1] * old[1] + matrix[0][2],
matrix[1][0] * old[0]+ matrix[1][1] * old[1] + matrix[1][2],
1.0]
def parse_transform(self, transform):
transformList = [ ]
xfs = transform.split(")")
for xf in xfs:
if xf.find("(") != -1:
op = xf[:xf.index("(")]
params = xf[xf.index("(")+1:].split(",")
transformList.append((op, params))
return transformList
def apply_style(self, tag: str, attrib):
def apply_style_to_attrib(style: str, attrib): # converts styles into attributes
cssAttributes = style.split(";")
for a in cssAttributes:
if a.strip() != "":
(k, v) = a.split(":")
if k.strip() != "":
attrib[k.strip()] = v.strip()
if "id" in attrib:
id = attrib["id"]
for (sel, style) in self.styles:
if sel == "#" + id:
apply_style_to_attrib(style, attrib)
if "class" in attrib:
classes = attrib["class"].split(' ')
for (sel, style) in self.styles:
if sel in map(lambda cls: "." + cls, classes):
apply_style_to_attrib(style, attrib)
if "style" in attrib:
apply_style_to_attrib(attrib["style"], attrib)
def parse_font_size(self, fontSize):
return self.parse_size(fontSize)
def parse_size(self, size):
scale = self.get_scale()
if type(size) == str:
return int(round(float(size.replace("px", "")) * scale))
return int(round(float(size) * scale))
def get_ns_tag(self, tag: str) -> Tuple[str, str]:
ns = tag[tag.index("{")+1:tag.index("}")]
tag = tag[tag.index("}")+1:]
return (ns, tag)
def parse_color(self, colour: str, fill_opacity: float = 1.0):
if colour == "none" or colour == None:
return None
col = ImageColor.getrgb(colour)
# print(colour, col)
if len(col) > 3: fill_opacity = (col[3] / 255.0)
col = (col[0], col[1], col[2], int(self.get_opacity() * fill_opacity * 255))
if self.draw.mode == "1": # bit mode
bw_color = (col[0] + col[1] + col[2]) / (255 * 3)
return int(bw_color)
return col
def resolve_font(self):
default_font = "Arial"
family = self.get_attribute("font-family", default_font, True).replace("'", "").replace("\"", "")
weight = self.get_attribute("font-weight", "normal", True)
style = self.get_attribute("font-style", "normal", True)
size = self.parse_font_size(self.get_attribute("font-size", 16, True))
font_key = "%s//%s//%s" % (family, weight, style)
try:
return ImageFont.truetype(font_mapping[font_key] if font_key in font_mapping else family, size)
except:
return ImageFont.truetype(default_font, size)
def flush_text(self):
text = self.text
self.draw_text(text)
# texts = text.split(" ")
# first = True
# for t in texts:
# if first:
# first = False
# else:
# self.draw_text(" ")
# self.draw_text(t)
def draw_text(self, text: str):
def draw_text_fix(xy: Tuple[float, float], text: str, font, fill):
last_text_point = xy
texts = text.split(" ")
font_size = self.parse_font_size(self.get_attribute("font-size", 48, True))
space_size = font_size / 3
first = True
for t in texts:
if first:
first = False
else:
last_text_point = (last_text_point[0] + space_size, last_text_point[1])
size = self.draw.textsize(t, font = font)
self.draw.text(last_text_point, t, font = font, fill = fill)
last_text_point = (last_text_point[0] + size[0], last_text_point[1])
return last_text_point
def draw_text_size_fix(text: str, font: ImageFont):
sizefull = self.draw.textsize(text, font = font)
texts = text.split(" ")
width = 0.0
font_size = self.parse_font_size(self.get_attribute("font-size", 48, True))
space_size = font_size / 3
first = True
for t in texts:
if first:
first = False
else:
width += space_size
size = self.draw.textsize(t, font = font)
width += size[0]
return (width, sizefull[1])
#text = self.textStack[-1]
#self.textStack[-1] = ""
self.text = ""
(tag, attrib) = self.tagstack[-1]
if (tag == "text" or tag == "tspan"):
if text != "":
alignment = self.get_attribute("text-align", "start", True)
alignment = self.get_attribute("text-anchor", alignment, True)
# print (text, self.getCoords(self.getAttribute("x", 0, True), self.getAttribute("y", 0, True)), self.getAttribute("font-size", 0, True), self.parseFontSize(self.getAttribute("font-size", 0, True)))
last_text_point = self.lasttextpoint
font = self.resolve_font()
ascent, descent = font.getmetrics()
size = draw_text_size_fix(text, font)
if alignment == "end":
draw_text_fix((last_text_point[0] - size[0], last_text_point[1] - ascent), text, font, self.parse_color(self.get_attribute("fill", "#000", False)))
self.lasttextpoint = (last_text_point[0], last_text_point[1])
if alignment == "middle":
last_text_point = draw_text_fix((last_text_point[0] - size[0] / 2, last_text_point[1] - ascent), text, font, self.parse_color(self.get_attribute("fill", "#000", False)))
self.lasttextpoint = (last_text_point[0] + size[0] / 2, last_text_point[1])
else:
draw_text_fix((last_text_point[0], last_text_point[1] - ascent), text, font, self.parse_color(self.get_attribute("fill", "#000", False)))
self.lasttextpoint = (last_text_point[0] + size[0], last_text_point[1])
def parse_path_data(self, data: str):
def func(result: List[List[str]], c: str):
last = result[-1]
if c.isalpha():
result.append([c])
result.append([])
elif c == "-":
result.append([c])
elif c == " " or c == ",":
result.append([])
else:
last.append(c)
return result
return list(filter(None, map(lambda x: "".join(x), reduce(func, data, [[]]))))
def flush_line(self, pointList: List[float], width: int, stroke: Union[int, Tuple[int, int, int]], fill: Union[int, Tuple[int, int, int]]):
if len(pointList) != 0:
if (fill != None):
self.draw.polygon(pointList, fill=fill)
if (stroke != None):
self.draw.line(pointList, width=width, fill=stroke)
def draw_path(self, data: List[str]):
def relative_absolute_point(point: Tuple[float, float], lastpoint: Tuple[float, float], op: str):
relative = op[0].islower()
if (not relative):
return point
return (point[0] + lastpoint[0], point[1] + lastpoint[1])
def add_transform_to_point_list(point_list: List[float], point: Tuple[float, float]):
transformed_point = self.get_coords(point[0], point[1])
point_list.append(transformed_point[0])
point_list.append(transformed_point[1])
def draw_bezier(point_list: List[float], lastpoint: Tuple[float, float], p1: Tuple[float, float], p2: Tuple[float, float], p: Tuple[float, float]):
transformed_last_point = self.get_coords(lastpoint[0], lastpoint[1])
transformed_p = self.get_coords(p[0], p[1])
max_range = int(max(abs(transformed_last_point[0] - transformed_p[0]), abs(transformed_last_point[1] - transformed_p[1])));
# print(lastpoint, p1, p2, p)
for i in range(0, max_range):
t = i / float(max_range)
ipointx = math.pow(1 - t, 3) * lastpoint[0] + 3 * math.pow(1 - t, 2) * t * (p1[0]) + 3 * (1 - t) * math.pow(t, 2) * (p2[0]) + math.pow(t, 3) * p[0]
ipointy = math.pow(1 - t, 3) * lastpoint[1] + 3 * math.pow(1 - t, 2) * t * (p1[1]) + 3 * (1 - t) * math.pow(t, 2) * (p2[1]) + math.pow(t, 3) * p[1]
add_transform_to_point_list(point_list, (ipointx, ipointy))
add_transform_to_point_list(point_list, p)
stroke_width = self.parse_size(self.get_attribute("stroke-width", 1.0, True))
stroke = self.parse_color(self.get_attribute("stroke", None, True))
fill = self.parse_color(self.get_attribute("fill", None, True))
# print(stroke_width, stroke, fill)
op = "M"
opcount = 0
x = 0
origin = None
last_point = (0.0, 0.0)
last_p2 = (0.0, 0.0)
point_list = [ ]
while x < len(data):
if data[x].isalpha():
op = data[x]
opcount = 0
x += 1
d: List[float] = list(map(lambda xx: xx if isinstance(xx, str) and xx.isalpha() else float(xx), data[x:x+6]))
# print(op, d)
param_len = 1
if op in ["M", "m"] and opcount < 1:
# Move
self.flush_line(point_list, stroke_width, stroke, fill)
point_list = [ ]
last_point = relative_absolute_point((d[0], d[1]), last_point, op)
if origin == None:
origin = last_point
add_transform_to_point_list(point_list, last_point)
param_len = 2
elif op in ["L", "l", "M", "m"]:
# Line
last_point = relative_absolute_point((d[0], d[1]), last_point, op)
add_transform_to_point_list(point_list, last_point)
param_len = 2
elif op in ["H", "h"]:
# Horizontal move
last_point = relative_absolute_point((d[0], last_point[1]), (last_point[0], 0), op)
add_transform_to_point_list(point_list, last_point)
elif op in ["V", "v"]:
# Vertical move
last_point = relative_absolute_point((last_point[0], d[0]), (0, last_point[1]), op)
add_transform_to_point_list(point_list, last_point)
elif op in ["C", "c", "S", "s"]:
# Bezier curve
short_hand = op in ["S", "s"]
p1 = (last_point[0] - (last_p2[0] - last_point[0]), last_point[1] - (last_p2[1] - last_point[1]))
p2 = relative_absolute_point((d[0], d[1]), last_point, op)
p = relative_absolute_point((d[2], d[3]), last_point, op)
if not short_hand:
p1 = relative_absolute_point((d[0], d[1]), last_point, op)
p2 = relative_absolute_point((d[2], d[3]), last_point, op)
p = relative_absolute_point((d[4], d[5]), last_point, op)
draw_bezier(point_list, last_point, p1, p2, p)
last_point = p
last_p2 = p2
param_len = 6 if not short_hand else 4
elif op in ["Q", "q", "T", "t"]:
# Quadratic bezier curve
short_hand = op in ["T", "t"]
# print("lastpoint", last_point, last_p2)
p1 = (last_point[0] - (last_p2[0] - last_point[0]), last_point[1] - (last_p2[1] - last_point[1]))
p = relative_absolute_point((d[0], d[1]), last_point, op)
if not short_hand:
p1 = relative_absolute_point((d[0], d[1]), last_point, op)
p = relative_absolute_point((d[2], d[3]), last_point, op)
# else:
# print("lastpoint", last_point)
# print("last_p2", last_point)
# print("p1", p1)
# print("p", p)
draw_bezier(point_list, last_point, (p1[0] - (p1[0] - last_point[0])/3, p1[1] - (p1[1] - last_point[1])/3), (p1[0] - (p1[0] - p[0])/3, p1[1] - (p1[1] - p[1])/3), p)
last_point = p
last_p2 = p1
param_len = 4 if not short_hand else 2
elif op in ["z", "Z"]:
# Close loop
add_transform_to_point_list(point_list, origin)
param_len = 0
if not (op in ["C", "c", "S", "s", "Q", "q", "T", "t"]):
last_p2 = last_point
opcount += 1
x += param_len
self.flush_line(point_list, stroke_width, stroke, fill)
def parse_style_tag(self):
css = self.text
#print(css)
decls = css.split('}')
for decl in decls:
keyvalue = decl.split('{')
if (len(keyvalue) == 2):
self.styles.append((keyvalue[0].strip(), keyvalue[1].strip()))
#print(self.styles)
# open XML tag
def start(self, tag: str, attrib):
(ns, tag) = self.get_ns_tag(tag)
if ns != self.svgns:
return
if self.draw and self.text != "":
self.flush_text()
self.tagstack.append((tag, attrib))
if self.draw:
self.apply_style(tag, attrib)
if not self.draw and not tag == "svg":
return
if tag == "svg":
self.svgsize = (float(self.get_attribute("width", self.imagesize[0], False)), float(self.get_attribute("height", self.imagesize[1], False)))
if ("viewBox" in attrib):
self.svgviewbox = list(map(lambda s: float(s.strip()), filter(None, attrib["viewBox"].split(" "))))
else:
self.svgviewbox = [0, 0, self.svgsize[0], self.svgsize[1]]
#print self.svgViewBox
if tag == "style":
self.parse_style_tag()
elif tag == "rect":
#print self.tagStack[-1][1]
(x1, y1) = self.get_coords(attrib["x"], attrib["y"])
(x2, y2) = self.get_coords(float(attrib["x"]) + float(attrib["width"]), float(attrib["y"]))
(x3, y3) = self.get_coords(float(attrib["x"]) + float(attrib["width"]), float(attrib["y"]) + float(attrib["height"]))
(x4, y4) = self.get_coords(float(attrib["x"]), float(attrib["y"]) + float(attrib["height"]))
self.draw.polygon([x1, y1, x2, y2, x3, y3, x4, y4],
outline = self.parse_color(self.get_attribute("stroke", "none", False), float(self.get_attribute("stroke-opacity", "1", False))),
fill = self.parse_color(self.get_attribute("fill", "none", False), float(self.get_attribute("fill-opacity", "1", False))))
elif tag == "ellipse" or tag == "circle":
cc = 0.55191502449
cx = float(attrib["cx"])
cy = float(attrib["cy"])
if tag == "ellipse":
rx = float(attrib["rx"])
ry = float(attrib["ry"])
else:
rx = float(attrib["r"])
ry = float(attrib["r"])
w = rx
h = ry
self.draw_path(["M", cx - w, cy, "C", cx - w, cy - cc * h, cx - cc * w, cy - h, cx, cy - h,
"S", cx + w, cy - cc * h, cx + w, cy,
"S", cx + cc * w, cy + h, cx, cy + h,
"S", cx - w, cy + cc * h, cx - w, cy,
"z"
])
elif tag == "polyline":
path_data = self.parse_path_data(self.get_attribute("points", "", False))
self.draw_path(path_data)
elif tag == "path":
path_data = self.parse_path_data(self.get_attribute("d", "", False))
self.draw_path(path_data)
elif tag == "text" or tag == "tspan":
if "x" in attrib:
self.lasttextpoint = self.get_coords(self.get_attribute("x", 0, True), self.get_attribute("y", 0, True))
self.depth += 1
# close XML tag
def end(self, tag):
self.depth -= 1
(ns, tag) = self.get_ns_tag(tag)
if ns != self.svgns:
return
if self.draw:
if tag == "style":
self.parse_style_tag()
if tag == "title" or tag == "desc":
pass
else:
self.flush_text()
#self.textStack.pop()
self.tagstack.pop()
if (len(self.tagstack) == 0):
self.finished = True
# text data
def data(self, data):
self.text = self.text + data
# print(self.tagstack[-1][0], 'text', data)
# finish parsing
def close(self): pass
def __init__(self, imagedraw: ImageDraw.ImageDraw, imagesize: Tuple[int, int], background: str):
self.draw = imagedraw
self.imagesize = imagesize
self.depth = 0
self.tagstack = [ ]
self.textstack = [ ]
self.lasttextpoint = [0, 0]
self.text = ""
self.svgsize = imagesize
self.styles = [ ]
# set default background colour
if imagedraw and background:
imagedraw.rectangle((0, 0, imagesize[0], imagesize[1]), self.parse_color(background))
class SvgDecoder(ImageFile.PyDecoder):
"""
Python implementation of a SVG format decoder.
"""
imagesize: Tuple[int, int] = None
def init(self, args):
(image_draw_mode, image, image_draw, image_size, background) = args
image_draw_mode = "RGBA" if image_draw_mode == None else image_draw_mode
if image != None: self.setimage(image)
image_draw = ImageDraw.Draw(self.im, image_draw_mode) if image_draw == None else image_draw
self.imagesize = (self.im.width, self.im.height) if image_size == None else image_size
self.target = SvgPainter(image_draw, self.imagesize, background)
self.parser = XMLParser(target=self.target)
def decode(self, buffer):
self.parser.feed(buffer)
return (len(buffer) if not self.target.finished else -1, 0)
def cleanup(self):
self.parser.close()
Image.register_decoder("SVGXML", lambda mode, *args: SvgDecoder(mode, *args))
def draw_svg_file(file: str, imagedraw: ImageDraw.ImageDraw, imagesize: Tuple[int, int], background: str):
decoder = SvgDecoder("", None, None, imagedraw, imagesize, background)
f = open(file, "r")
xmlString = f.read()
decoder.decode(xmlString)
decoder.cleanup()
def _accept(prefix):
prefixStr = prefix.decode("utf-8")
return "<?xml" in prefixStr or "<svg " in prefixStr or "<!DOC" in prefixStr
class SvgImageFile(ImageFile.ImageFile):
"""
Python implementation of a SVG Rasterised Image.
"""
format = "SVG"
format_description = "SVG image"
def _open(self):
header = self.fp.read(4096)
# size in pixels (width, height)
self._size = svg_default_size
try:
# try to find the SVG width and height
target = SvgPainter(None, self._size, None)
parser = XMLParser(target=target)
parser.feed(header)
if target.svgsize:
self._size = (int(target.svgsize[0]), int(target.svgsize[1]))
parser.close()
except:
pass
# mode setting
self.mode = "RGB"
# data descriptor
self.tile = [("SVGXML", (0, 0) + self.size, 0, (None, self, None, None, svg_default_background))]
Image.register_open(SvgImageFile.format, SvgImageFile, _accept)
Image.register_extensions(SvgImageFile.format, [
".svg"
])
Image.register_mime(SvgImageFile.format, "image/svg+xml")