/usr/lib/python2.7/dist-packages/cairosvg/surface/__init__.py is in python-cairosvg 1.0.9-1.
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# 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/>.
"""
Cairo surface creators.
"""
import io
try:
import cairocffi as cairo
# OSError means cairocffi is installed,
# but could not load a cairo dynamic library.
# pycairo may still be available with a statically-linked cairo.
except (ImportError, OSError):
import cairo # pycairo
from ..parser import Tree
from .colors import color
from .defs import (
apply_filter_after, apply_filter_before, gradient_or_pattern, parse_def,
paint_mask)
from .helpers import (
node_format, transform, normalize, paint, urls, apply_matrix_transform,
PointError, rect)
from .path import PATH_TAGS
from .tags import TAGS
from .units import size
from . import units
class Surface(object):
"""Abstract base class for CairoSVG surfaces.
The ``width`` and ``height`` attributes are in device units (pixels for
PNG, else points).
The ``context_width`` and ``context_height`` attributes are in user units
(i.e. in pixels), they represent the size of the active viewport.
"""
# Subclasses must either define this or override _create_surface()
surface_class = None
@classmethod
def convert(cls, bytestring=None, **kwargs):
"""Convert a SVG document to the format for this class.
Specify the input by passing one of these:
:param bytestring: The SVG source as a byte-string.
:param file_obj: A file-like object.
:param url: A filename.
And the output with:
:param write_to: The filename of file-like object where to write the
output. If None or not provided, return a byte string.
Only ``source`` can be passed as a positional argument, other
parameters are keyword-only.
"""
dpi = kwargs.pop('dpi', 96)
write_to = kwargs.pop('write_to', None)
kwargs['bytestring'] = bytestring
tree = Tree(**kwargs)
if write_to is None:
output = io.BytesIO()
else:
output = write_to
cls(tree, output, dpi).finish()
if write_to is None:
return output.getvalue()
def __init__(self, tree, output, dpi, parent_surface=None):
"""Create the surface from a filename or a file-like object.
The rendered content is written to ``output`` which can be a filename,
a file-like object, ``None`` (render in memory but do not write
anything) or the built-in ``bytes`` as a marker.
Call the ``.finish()`` method to make sure that the output is
actually written.
"""
self.cairo = None
self.context_width, self.context_height = None, None
self.cursor_position = [0, 0]
self.cursor_d_position = [0, 0]
self.text_path_width = 0
self.tree_cache = {(tree.url, tree["id"]): tree}
if parent_surface:
self.markers = parent_surface.markers
self.gradients = parent_surface.gradients
self.patterns = parent_surface.patterns
self.masks = parent_surface.masks
self.paths = parent_surface.paths
self.filters = parent_surface.filters
else:
self.markers = {}
self.gradients = {}
self.patterns = {}
self.masks = {}
self.paths = {}
self.filters = {}
self.page_sizes = []
self._old_parent_node = self.parent_node = None
self.output = output
self.dpi = dpi
self.font_size = size(self, "12pt")
self.stroke_and_fill = True
width, height, viewbox = node_format(self, tree)
# Actual surface dimensions: may be rounded on raster surfaces types
self.cairo, self.width, self.height = self._create_surface(
width * self.device_units_per_user_units,
height * self.device_units_per_user_units)
self.page_sizes.append((self.width, self.height))
self.context = cairo.Context(self.cairo)
# We must scale the context as the surface size is using physical units
self.context.scale(
self.device_units_per_user_units, self.device_units_per_user_units)
# Initial, non-rounded dimensions
self.set_context_size(width, height, viewbox)
self.context.move_to(0, 0)
self.draw_root(tree)
@property
def points_per_pixel(self):
"""Surface resolution."""
return 1 / (self.dpi * units.UNITS["pt"])
@property
def device_units_per_user_units(self):
"""Ratio between Cairo device units and user units.
Device units are points for everything but PNG, and pixels for
PNG. User units are pixels.
"""
return self.points_per_pixel
def _create_surface(self, width, height):
"""Create and return ``(cairo_surface, width, height)``."""
# self.surface_class should not be None when called here
# pylint: disable=E1102
cairo_surface = self.surface_class(self.output, width, height)
# pylint: enable=E1102
return cairo_surface, width, height
def set_context_size(self, width, height, viewbox):
"""Set the Cairo context size, set the SVG viewport size."""
if viewbox:
x, y, x_size, y_size = viewbox
self.context_width, self.context_height = x_size, y_size
x_ratio, y_ratio = width / x_size, height / y_size
matrix = cairo.Matrix()
if x_ratio > y_ratio:
matrix.translate((width - x_size * y_ratio) / 2, 0)
matrix.scale(y_ratio, y_ratio)
matrix.translate(-x / x_ratio * y_ratio, -y)
elif x_ratio < y_ratio:
matrix.translate(0, (height - y_size * x_ratio) / 2)
matrix.scale(x_ratio, x_ratio)
matrix.translate(-x, -y / y_ratio * x_ratio)
else:
matrix.scale(x_ratio, y_ratio)
matrix.translate(-x, -y)
apply_matrix_transform(self, matrix)
else:
self.context_width, self.context_height = width, height
def finish(self):
"""Read the surface content."""
self.cairo.finish()
def draw_root(self, node):
"""Draw the root ``node``."""
self.draw(node)
def draw(self, node):
"""Draw ``node`` and its children."""
old_font_size = self.font_size
self.font_size = size(self, node.get("font-size", "12pt"))
# Do not draw defs
if node.tag == "defs":
for child in node.children:
parse_def(self, child)
return
# Do not draw elements with width or height of 0
if (("width" in node and size(self, node["width"]) == 0) or
("height" in node and size(self, node["height"]) == 0)):
return
node.tangents = [None]
node.pending_markers = []
self._old_parent_node = self.parent_node
self.parent_node = node
self.context.save()
# Transform the context according to the ``transform`` attribute
transform(self, node.get("transform"))
masks = urls(node.get("mask"))
mask = masks[0][1:] if masks else None
opacity = float(node.get("opacity", 1))
if mask or (opacity < 1 and node.children):
self.context.push_group()
self.context.move_to(
size(self, node.get("x"), "x"),
size(self, node.get("y"), "y"))
if node.tag in PATH_TAGS:
# Set 1 as default stroke-width
if not node.get("stroke-width"):
node["stroke-width"] = "1"
# Set node's drawing informations if the ``node.tag`` method exists
line_cap = node.get("stroke-linecap")
if line_cap == "square":
self.context.set_line_cap(cairo.LINE_CAP_SQUARE)
if line_cap == "round":
self.context.set_line_cap(cairo.LINE_CAP_ROUND)
join_cap = node.get("stroke-linejoin")
if join_cap == "round":
self.context.set_line_join(cairo.LINE_JOIN_ROUND)
if join_cap == "bevel":
self.context.set_line_join(cairo.LINE_JOIN_BEVEL)
dash_array = normalize(node.get("stroke-dasharray", "")).split()
if dash_array:
dashes = [size(self, dash) for dash in dash_array]
if sum(dashes):
offset = size(self, node.get("stroke-dashoffset"))
self.context.set_dash(dashes, offset)
miter_limit = float(node.get("stroke-miterlimit", 4))
self.context.set_miter_limit(miter_limit)
# Clip
rect_values = rect(node.get("clip"))
if len(rect_values) == 4:
top = size(self, rect_values[0], "y")
right = size(self, rect_values[1], "x")
bottom = size(self, rect_values[2], "y")
left = size(self, rect_values[3], "x")
x = size(self, node.get("x"), "x")
y = size(self, node.get("y"), "y")
width = size(self, node.get("width"), "x")
height = size(self, node.get("height"), "y")
self.context.save()
self.context.translate(x, y)
self.context.rectangle(
left, top, width - left - right, height - top - bottom)
self.context.restore()
self.context.clip()
clip_paths = urls(node.get("clip-path"))
if clip_paths:
path = self.paths.get(clip_paths[0][1:])
if path:
self.context.save()
if path.get("clipPathUnits") == "objectBoundingBox":
x = size(self, node.get("x"), "x")
y = size(self, node.get("y"), "y")
width = size(self, node.get("width"), "x")
height = size(self, node.get("height"), "y")
self.context.translate(x, y)
self.context.scale(width, height)
path.tag = "g"
self.stroke_and_fill = False
self.draw(path)
self.stroke_and_fill = True
self.context.restore()
if node.get("clip-rule") == "evenodd":
self.context.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)
self.context.clip()
self.context.set_fill_rule(cairo.FILL_RULE_WINDING)
# Filter
apply_filter_before(self, node)
if node.tag in TAGS:
try:
TAGS[node.tag](self, node)
except PointError:
# Error in point parsing, do nothing
pass
# Filter
apply_filter_after(self, node)
# Get stroke and fill opacity
stroke_opacity = float(node.get("stroke-opacity", 1))
fill_opacity = float(node.get("fill-opacity", 1))
if opacity < 1 and not node.children:
stroke_opacity *= opacity
fill_opacity *= opacity
# Manage display and visibility
display = node.get("display", "inline") != "none"
visible = display and (node.get("visibility", "visible") != "hidden")
if self.stroke_and_fill and visible and node.tag in TAGS:
# Fill
self.context.save()
paint_source, paint_color = paint(node.get("fill", "black"))
if not gradient_or_pattern(self, node, paint_source):
if node.get("fill-rule") == "evenodd":
self.context.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)
self.context.set_source_rgba(*color(paint_color, fill_opacity))
self.context.fill_preserve()
self.context.restore()
# Stroke
self.context.save()
self.context.set_line_width(size(self, node.get("stroke-width")))
paint_source, paint_color = paint(node.get("stroke"))
if not gradient_or_pattern(self, node, paint_source):
self.context.set_source_rgba(
*color(paint_color, stroke_opacity))
self.context.stroke()
self.context.restore()
elif not visible:
self.context.new_path()
# Draw children
if display and node.tag not in (
"linearGradient", "radialGradient", "marker", "pattern",
"mask", "clipPath", "filter"):
for child in node.children:
self.draw(child)
if mask or (opacity < 1 and node.children):
self.context.pop_group_to_source()
if mask and mask in self.masks:
paint_mask(self, node, mask, opacity)
else:
self.context.paint_with_alpha(opacity)
# Clean cursor's position after 'text' tags
if node.tag == "text":
self.cursor_position = [0, 0]
self.cursor_d_position = [0, 0]
self.text_path_width = 0
if not node.root:
# Restoring context is useless if we are in the root tag, it may
# raise an exception if we have multiple svg tags
self.context.restore()
self.parent_node = self._old_parent_node
self.font_size = old_font_size
class MultipageSurface(Surface):
"""Abstract base class for surfaces that can handle multiple pages."""
def draw_root(self, node):
self.width = None
self.height = None
svg_children = [child for child in node.children if child.tag == 'svg']
if svg_children:
# Multi-page
for page in svg_children:
width, height, viewbox = node_format(self, page)
self.context.save()
self.set_context_size(width, height, viewbox)
width *= self.device_units_per_user_units
height *= self.device_units_per_user_units
self.page_sizes.append((width, height))
self.cairo.set_size(width, height)
self.draw(page)
self.context.restore()
self.cairo.show_page()
else:
self.draw(node)
class PDFSurface(MultipageSurface):
"""A surface that writes in PDF format."""
surface_class = cairo.PDFSurface
class PSSurface(MultipageSurface):
"""A surface that writes in PostScript format."""
surface_class = cairo.PSSurface
class PNGSurface(Surface):
"""A surface that writes in PNG format."""
device_units_per_user_units = 1
def _create_surface(self, width, height):
"""Create and return ``(cairo_surface, width, height)``."""
width = int(width)
height = int(height)
cairo_surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
return cairo_surface, width, height
def finish(self):
"""Read the PNG surface content."""
if self.output is not None:
self.cairo.write_to_png(self.output)
return super(PNGSurface, self).finish()
class SVGSurface(Surface):
"""A surface that writes in SVG format.
It may seem pointless to render SVG to SVG, but this can be used
with ``output=None`` to get a vector-based single page cairo surface.
"""
surface_class = cairo.SVGSurface
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