Jan 9, 2018 · Jan 9, 2018 · Jan 9, 2018
diff --git a/lib/matplotlib/backends/backend_cairo.py b/lib/matplotlib/backends/backend_cairo.py

 import numpy as np

 # cairocffi is more widely compatible than pycairo (in particular pgi only
 # works with cairocffi) so try it first.
 try:
    import cairocffi as cairo
 except ImportError:
    try:
        import cairo
    except ImportError:
        raise ImportError("Cairo backend requires that cairocffi or pycairo "
                          "is installed.")
        raise ImportError("cairo backend requires that cairocffi or pycairo "
                          "is installed")
    else:
        HAS_CAIRO_CFFI = False
 else:
    HAS_CAIRO_CFFI = True

 _version_required = (1, 2, 0)
 if cairo.version_info < _version_required:
    raise ImportError("Pycairo %d.%d.%d is installed\n"
                      "Pycairo %d.%d.%d or later is required"
                      % (cairo.version_info + _version_required))
 if cairo.version_info < (1, 4, 0):
    raise ImportError("cairo {} is installed; "
                      "cairo>=1.4.0 is required".format(cairo.version))
 backend_version = cairo.version
 del _version_required

 from matplotlib.backend_bases import (
    _Backend, FigureCanvasBase, FigureManagerBase, GraphicsContextBase,

    def set_ctx_from_surface(self, surface):
        self.gc.ctx = cairo.Context(surface)
        # Although it may appear natural to automatically call
        # `self.set_width_height(surface.get_width(), surface.get_height())`
        # here (instead of having the caller do so separately), this would fail
        # for PDF/PS/SVG surfaces, which have no way to report their extents.

    def set_width_height(self, width, height):
        self.width  = width
        self.height = height
        self.matrix_flipy = cairo.Matrix(yy=-1, y0=self.height)
        # use matrix_flipy for ALL rendering?
        # - problem with text? - will need to switch matrix_flipy off, or do a
        # font transform?

    def _fill_and_stroke(self, ctx, fill_c, alpha, alpha_overrides):
        if fill_c is not None:

        ctx.restore()

    def flipy(self):
        return True
        #return False # tried - all draw objects ok except text (and images?)
        # which comes out mirrored!

    def get_canvas_width_height(self):
        return self.width, self.height
Original file line number	Diff line number	Diff line change
Expand Up		@@ -29,26 +29,25 @@

		import numpy as np

		# cairocffi is more widely compatible than pycairo (in particular pgi only
Copy link Member jklymakJan 9, 2018 Choose a reason for hiding this comment The reason will be displayed to describe this comment to others.Learn more. This note should prob end up in some docs if it hasn't already...
		# works with cairocffi) so try it first.
		try:
		import cairocffi as cairo
		except ImportError:
		try:
		import cairo
		except ImportError:
		raise ImportError("Cairo backend requires that cairocffi or pycairo "
		"is installed.")
		raise ImportError("cairo backend requires that cairocffi or pycairo "
		"is installed")
		else:
		HAS_CAIRO_CFFI = False
		else:
		HAS_CAIRO_CFFI = True

		_version_required = (1, 2, 0)
		if cairo.version_info < _version_required:
		raise ImportError("Pycairo %d.%d.%d is installed\n"
		"Pycairo %d.%d.%d or later is required"
		% (cairo.version_info + _version_required))
		if cairo.version_info < (1, 4, 0):
		raise ImportError("cairo {} is installed; "
		"cairo>=1.4.0 is required".format(cairo.version))
		backend_version = cairo.version
		del _version_required

		from matplotlib.backend_bases import (
		_Backend, FigureCanvasBase, FigureManagerBase, GraphicsContextBase,
Expand DownExpand Up		@@ -113,14 +112,14 @@ def __init__(self, dpi):

		def set_ctx_from_surface(self, surface):
		self.gc.ctx = cairo.Context(surface)
		# Although it may appear natural to automatically call
		# `self.set_width_height(surface.get_width(), surface.get_height())`
		# here (instead of having the caller do so separately), this would fail
		# for PDF/PS/SVG surfaces, which have no way to report their extents.

		def set_width_height(self, width, height):
		self.width = width
		self.height = height
		self.matrix_flipy = cairo.Matrix(yy=-1, y0=self.height)
		# use matrix_flipy for ALL rendering?
		# - problem with text? - will need to switch matrix_flipy off, or do a
		# font transform?

		def _fill_and_stroke(self, ctx, fill_c, alpha, alpha_overrides):
		if fill_c is not None:
Expand DownExpand Up		@@ -314,11 +313,6 @@ def _draw_mathtext(self, gc, x, y, s, prop, angle):

		ctx.restore()

		def flipy(self):
		return True
		#return False # tried - all draw objects ok except text (and images?)
		# which comes out mirrored!

		def get_canvas_width_height(self):
		return self.width, self.height

Expand Down