/usr/lib/python2.7/dist-packages/cairosvg/surface/image.py is in python-cairosvg 1.0.9-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 | # -*- coding: utf-8 -*-
# This file is part of CairoSVG
# Copyright © 2010-2012 Kozea
#
# This library is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This library is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with CairoSVG. If not, see <http://www.gnu.org/licenses/>.
"""
Images manager.
"""
import base64
import gzip
from io import BytesIO
try:
from urllib import urlopen, unquote
import urlparse
unquote_to_bytes = lambda data: unquote(
data.encode('ascii') if isinstance(data, unicode) else data)
except ImportError:
from urllib.request import urlopen
from urllib import parse as urlparse # Python 3
from urllib.parse import unquote_to_bytes
from . import cairo
from .helpers import node_format, size, preserve_ratio
from ..parser import Tree
def open_data_url(url):
"""Decode URLs with the 'data' scheme. urllib can handle them
in Python 2, but that is broken in Python 3.
Inspired from Python 2.7.2’s urllib.py.
"""
# syntax of data URLs:
# dataurl := "data:" [ mediatype ] [ ";base64" ] "," data
# mediatype := [ type "/" subtype ] *( ";" parameter )
# data := *urlchar
# parameter := attribute "=" value
try:
header, data = url.split(",", 1)
except ValueError:
raise IOError("bad data URL")
header = header[5:] # len("data:") == 5
if header:
semi = header.rfind(";")
if semi >= 0 and "=" not in header[semi:]:
encoding = header[semi+1:]
else:
encoding = ""
else:
encoding = ""
data = unquote_to_bytes(data)
if encoding == "base64":
missing_padding = 4 - len(data) % 4
if missing_padding:
data += b"=" * missing_padding
return base64.decodestring(data)
return data
def image(surface, node):
"""Draw an image ``node``."""
url = node.get("{http://www.w3.org/1999/xlink}href")
if not url:
return
if url.startswith("data:"):
image_bytes = open_data_url(url)
else:
base_url = node.get("{http://www.w3.org/XML/1998/namespace}base")
if base_url:
url = urlparse.urljoin(base_url, url)
if node.url:
url = urlparse.urljoin(node.url, url)
if urlparse.urlparse(url).scheme:
input_ = urlopen(url)
else:
input_ = open(url, 'rb') # filename
image_bytes = input_.read()
if len(image_bytes) < 5:
return
x, y = size(surface, node.get("x"), "x"), size(surface, node.get("y"), "y")
width = size(surface, node.get("width"), "x")
height = size(surface, node.get("height"), "y")
surface.context.rectangle(x, y, width, height)
surface.context.clip()
if image_bytes[:4] == b"\x89PNG":
png_file = BytesIO(image_bytes)
elif (image_bytes[:5] in (b"<svg ", b"<?xml", b"<!DOC") or
image_bytes[:2] == b"\x1f\x8b"):
if image_bytes[:2] == b"\x1f\x8b":
image_bytes = gzip.GzipFile(fileobj=BytesIO(image_bytes)).read()
surface.context.save()
surface.context.translate(x, y)
if "x" in node:
del node["x"]
if "y" in node:
del node["y"]
if "viewBox" in node:
del node["viewBox"]
tree = Tree(
url=url, bytestring=image_bytes, tree_cache=surface.tree_cache)
tree_width, tree_height, viewbox = node_format(surface, tree)
if not tree_width or not tree_height:
tree_width = tree["width"] = width
tree_height = tree["height"] = height
node.image_width = tree_width or width
node.image_height = tree_height or height
scale_x, scale_y, translate_x, translate_y = \
preserve_ratio(surface, node)
surface.set_context_size(*node_format(surface, tree))
surface.context.translate(*surface.context.get_current_point())
surface.context.scale(scale_x, scale_y)
surface.context.translate(translate_x, translate_y)
surface.draw(tree)
surface.context.restore()
# Restore twice, because draw does not restore at the end of svg tags
surface.context.restore()
return
else:
try:
from PIL import Image
png_file = BytesIO()
Image.open(BytesIO(image_bytes)).save(png_file, 'PNG')
png_file.seek(0)
except:
# No way to handle the image
return
image_surface = cairo.ImageSurface.create_from_png(png_file)
node.image_width = image_surface.get_width()
node.image_height = image_surface.get_height()
scale_x, scale_y, translate_x, translate_y = preserve_ratio(surface, node)
surface.context.rectangle(x, y, width, height)
pattern_pattern = cairo.SurfacePattern(image_surface)
surface.context.save()
surface.context.translate(*surface.context.get_current_point())
surface.context.scale(scale_x, scale_y)
surface.context.translate(translate_x, translate_y)
surface.context.set_source(pattern_pattern)
surface.context.fill()
surface.context.restore()
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