Manually mere rendering changes

3 files changed, 214 insertions, 193 deletions

diff --git a/gerber/render/cairo_backend.py b/gerber/render/cairo_backend.py
index 78ccf34..349640a 100644
--- a/gerber/render/cairo_backend.py
+++ b/gerber/render/cairo_backend.py
@@ -12,7 +12,7 @@
 # Unless required by applicable law or agreed to in writing, software

 # distributed under the License is distributed on an "AS IS" BASIS,

 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

-# See the License for the specific language governing permissions and

+# See the License for the specific language governing permissions and
 # limitations under the License.
 
 try:

@@ -21,7 +21,8 @@ except ImportError:
     import cairocffi as cairo

     
 import math

-from operator import mul, div

+from operator import mul, di

+
 import tempfile

 

 from ..primitives import *

@@ -36,11 +37,14 @@ except(ImportError):
 

 

 class GerberCairoContext(GerberContext):

+

     def __init__(self, scale=300):

-        GerberContext.__init__(self)

+        super(GerberCairoContext, self).__init__()

         self.scale = (scale, scale)

         self.surface = None

         self.ctx = None

+        self.active_layer = None

+        self.output_ctx = None

         self.bg = False

         self.mask = None

         self.mask_ctx = None

@@ -50,37 +54,40 @@ class GerberCairoContext(GerberContext):
 

     @property

     def origin_in_pixels(self):

-        return tuple(map(mul, self.origin_in_inch, self.scale)) if self.origin_in_inch is not None else (0.0, 0.0)

+        return (self.scale_point(self.origin_in_inch)

+                if self.origin_in_inch is not None else (0.0, 0.0))

 

     @property

     def size_in_pixels(self):

-        return tuple(map(mul, self.size_in_inch, self.scale)) if self.size_in_inch is not None else (0.0, 0.0)

+        return (self.scale_point(self.size_in_inch)

+                if self.size_in_inch is not None else (0.0, 0.0))

 

     def set_bounds(self, bounds, new_surface=False):

         origin_in_inch = (bounds[0][0], bounds[1][0])

-        size_in_inch = (abs(bounds[0][1] - bounds[0][0]), abs(bounds[1][1] - bounds[1][0]))

-        size_in_pixels = tuple(map(mul, size_in_inch, self.scale))

+        size_in_inch = (abs(bounds[0][1] - bounds[0][0]),

+                        abs(bounds[1][1] - bounds[1][0]))

+        size_in_pixels = self.scale_point(size_in_inch)

         self.origin_in_inch = origin_in_inch if self.origin_in_inch is None else self.origin_in_inch

         self.size_in_inch = size_in_inch if self.size_in_inch is None else self.size_in_inch

         if (self.surface is None) or new_surface:

             self.surface_buffer = tempfile.NamedTemporaryFile()

-            self.surface = cairo.SVGSurface(self.surface_buffer, size_in_pixels[0], size_in_pixels[1])

-            self.ctx = cairo.Context(self.surface)

-            self.ctx.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)

-            self.ctx.scale(1, -1)

-            self.ctx.translate(-(origin_in_inch[0] * self.scale[0]), (-origin_in_inch[1]*self.scale[0]) - size_in_pixels[1])

-            self.mask = cairo.SVGSurface(None, size_in_pixels[0], size_in_pixels[1])

-            self.mask_ctx = cairo.Context(self.mask)

-            self.mask_ctx.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)

-            self.mask_ctx.scale(1, -1)

-            self.mask_ctx.translate(-(origin_in_inch[0] * self.scale[0]), (-origin_in_inch[1]*self.scale[0]) - size_in_pixels[1])

-        self._xform_matrix = cairo.Matrix(xx=1.0, yy=-1.0, x0=-self.origin_in_pixels[0], y0=self.size_in_pixels[1] + self.origin_in_pixels[1])

+            self.surface = cairo.SVGSurface(

+                self.surface_buffer, size_in_pixels[0], size_in_pixels[1])

+            self.output_ctx = cairo.Context(self.surface)

+            self.output_ctx.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)

+            self.output_ctx.scale(1, -1)

+            self.output_ctx.translate(-(origin_in_inch[0] * self.scale[0]),

+                                      (-origin_in_inch[1] * self.scale[0]) - size_in_pixels[1])

+        self._xform_matrix = cairo.Matrix(xx=1.0, yy=-1.0,

+                                          x0=-self.origin_in_pixels[0],

+                                          y0=self.size_in_pixels[1] + self.origin_in_pixels[1])

 

     def render_layers(self, layers, filename, theme=THEMES['default']):

         """ Render a set of layers

         """

         self.set_bounds(layers[0].bounds, True)

         self._paint_background(True)

+

         for layer in layers:

             self._render_layer(layer, theme)

         self.dump(filename)

@@ -117,46 +124,46 @@ class GerberCairoContext(GerberContext):
         self.color = settings.color

         self.alpha = settings.alpha

         self.invert = settings.invert

+

+        # Get a new clean layer to render on

+        self._new_render_layer()

         if settings.mirror:

             raise Warning('mirrored layers aren\'t supported yet...')

-        if self.invert:

-            self._clear_mask()

         for prim in layer.primitives:

             self.render(prim)

-        if self.invert:

-            self._render_mask()

+        # Add layer to image

+        self._flatten()

 

     def _render_line(self, line, color):

-        start = map(mul, line.start, self.scale)

-        end = map(mul, line.end, self.scale)

+        start = [pos * scale for pos, scale in zip(line.start, self.scale)]

+        end = [pos * scale for pos, scale in zip(line.end, self.scale)]

         if not self.invert:

-            ctx = self.ctx

-            ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

-            ctx.set_operator(cairo.OPERATOR_OVER if line.level_polarity == "dark" else cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

+            self.ctx.set_operator(cairo.OPERATOR_OVER

+                             if line.level_polarity == "dark"

+                             else cairo.OPERATOR_CLEAR)
         else:

-            ctx = self.mask_ctx

-            ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

-            ctx.set_operator(cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

+            self.ctx.set_operator(cairo.OPERATOR_CLEAR)

         if isinstance(line.aperture, Circle):

-            width = line.aperture.diameter

-            ctx.set_line_width(width * self.scale[0])

-            ctx.set_line_cap(cairo.LINE_CAP_ROUND)

-            

-            ctx.move_to(*start)

-            ctx.line_to(*end)

-            ctx.stroke()

+            width = line.aperture.diameter
+            self.ctx.set_line_width(width * self.scale[0])

+            self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)

+            self.ctx.move_to(*start)

+            self.ctx.line_to(*end)

+            self.ctx.stroke()
         elif isinstance(line.aperture, Rectangle):

-            points = [tuple(map(mul, x, self.scale)) for x in line.vertices]

-            ctx.set_line_width(0)

-            ctx.move_to(*points[0])

+            points = [self.scale_point(x) for x in line.vertices]

+            self.ctx.set_line_width(0)

+            self.ctx.move_to(*points[0])

             for point in points[1:]:

-                ctx.line_to(*point)

-            ctx.fill()

+                self.ctx.line_to(*point)

+            self.ctx.fill()

 

     def _render_arc(self, arc, color):

-        center = map(mul, arc.center, self.scale)

-        start = map(mul, arc.start, self.scale)

-        end = map(mul, arc.end, self.scale)

+        center = self.scale_point(arc.center)

+        start = self.scale_point(arc.start)

+        end = self.scale_point(arc.end)

         radius = self.scale[0] * arc.radius

         angle1 = arc.start_angle

         angle2 = arc.end_angle

@@ -169,141 +176,137 @@ class GerberCairoContext(GerberContext):
             width = max(arc.aperture.width, arc.aperture.height, 0.001)

         

         if not self.invert:

-            ctx = self.ctx

-            ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

-            ctx.set_operator(cairo.OPERATOR_OVER if arc.level_polarity == "dark" else cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

+            self.ctx.set_operator(cairo.OPERATOR_OVER

+                             if arc.level_polarity == "dark"\

+                             else cairo.OPERATOR_CLEAR)

         else:

-            ctx = self.mask_ctx

-            ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

-            ctx.set_operator(cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

+            self.ctx.set_operator(cairo.OPERATOR_CLEAR)

                 

-        ctx.set_line_width(width * self.scale[0])

-        ctx.set_line_cap(cairo.LINE_CAP_ROUND)

-        ctx.move_to(*start)  # You actually have to do this...

+        self.ctx.set_line_width(width * self.scale[0])

+        self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)

+        self.ctx.move_to(*start)  # You actually have to do this...

         if arc.direction == 'counterclockwise':

-            ctx.arc(center[0], center[1], radius, angle1, angle2)

+            self.ctx.arc(center[0], center[1], radius, angle1, angle2)

         else:

-            ctx.arc_negative(center[0], center[1], radius, angle1, angle2)

-        ctx.move_to(*end)  # ...lame

-        ctx.stroke()

+            self.ctx.arc_negative(center[0], center[1], radius, angle1, angle2)

+        self.ctx.move_to(*end)  # ...lame

 

     def _render_region(self, region, color):

         if not self.invert:

-            ctx = self.ctx

-            ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

-            ctx.set_operator(cairo.OPERATOR_OVER if region.level_polarity == "dark" else cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

+            self.ctx.set_operator(cairo.OPERATOR_OVER

+                                  if region.level_polarity == "dark"

+                                  else cairo.OPERATOR_CLEAR)

         else:

-            ctx = self.mask_ctx

-            ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

-            ctx.set_operator(cairo.OPERATOR_CLEAR)

-

-        ctx.set_line_width(0)

-        ctx.set_line_cap(cairo.LINE_CAP_ROUND)

-        ctx.move_to(*tuple(map(mul, region.primitives[0].start, self.scale)))

-        for p in region.primitives:

-            if isinstance(p, Line):

-                ctx.line_to(*tuple(map(mul, p.end, self.scale)))

+            self.ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

+            self.ctx.set_operator(cairo.OPERATOR_CLEAR)

+

+        self.ctx.set_line_width(0)

+        self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)

+        self.ctx.move_to(*self.scale_point(region.primitives[0].start))

+        for prim in region.primitives:

+            if isinstance(prim, Line):

+                self.ctx.line_to(*self.scale_point(prim.end))

             else:

-                center = map(mul, p.center, self.scale)

-                start = map(mul, p.start, self.scale)

-                end = map(mul, p.end, self.scale)

-                radius = self.scale[0] * p.radius

-                angle1 = p.start_angle

-                angle2 = p.end_angle

-                if p.direction == 'counterclockwise':

-                    ctx.arc(center[0], center[1], radius, angle1, angle2)

+                center = self.scale_point(prim.center)

+                radius = self.scale[0] * prim.radius

+                angle1 = prim.start_angle

+                angle2 = prim.end_angle

+                if prim.direction == 'counterclockwise':

+                    self.ctx.arc(*center, radius=radius,

+                                 angle1=angle1, angle2=angle2)

                 else:

-                    ctx.arc_negative(center[0], center[1], radius, angle1, angle2)

-        ctx.fill()

-

+                    self.ctx.arc_negative(*center, radius=radius,

+                                          angle1=angle1, angle2=angle2)

+        self.ctx.fill()


     def _render_circle(self, circle, color):

-        center = tuple(map(mul, circle.position, self.scale))

+        center = self.scale_point(circle.position)

         if not self.invert:

-            ctx = self.ctx

-            ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

-            ctx.set_operator(cairo.OPERATOR_OVER if circle.level_polarity == "dark" else cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

+            self.ctx.set_operator(cairo.OPERATOR_OVER

+                                  if circle.level_polarity == "dark"

+                                  else cairo.OPERATOR_CLEAR)

         else:

-            ctx = self.mask_ctx

-            ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

-            ctx.set_operator(cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

+            self.ctx.set_operator(cairo.OPERATOR_CLEAR)

             

         if circle.hole_diameter > 0:

-            ctx.push_group()

+            self.ctx.push_group()

 

-        ctx.set_line_width(0)

-        ctx.arc(center[0], center[1], radius=circle.radius * self.scale[0], angle1=0, angle2=2 * math.pi)

-        ctx.fill()

+        self.ctx.set_line_width(0)

+        self.ctx.arc(center[0], center[1], radius=circle.radius * self.scale[0], angle1=0, angle2=2 * math.pi)

+        self.ctx.fill()

         

         if circle.hole_diameter > 0:

             # Render the center clear

 

-            ctx.set_source_rgba(color[0], color[1], color[2], self.alpha)

-            ctx.set_operator(cairo.OPERATOR_CLEAR)        

-            ctx.arc(center[0], center[1], radius=circle.hole_radius * self.scale[0], angle1=0, angle2=2 * math.pi)

-            ctx.fill()

+            self.ctx.set_source_rgba(color[0], color[1], color[2], self.alpha)

+            self.ctx.set_operator(cairo.OPERATOR_CLEAR)        

+            self.ctx.arc(center[0], center[1], radius=circle.hole_radius * self.scale[0], angle1=0, angle2=2 * math.pi)

+            self.ctx.fill()

             

-            ctx.pop_group_to_source()

-            ctx.paint_with_alpha(1)
+            self.ctx.pop_group_to_source()

+            self.ctx.paint_with_alpha(1)
 

     def _render_rectangle(self, rectangle, color):

-        ll = map(mul, rectangle.lower_left, self.scale)

-        width, height = tuple(map(mul, (rectangle.width, rectangle.height), map(abs, self.scale)))

+        lower_left = self.scale_point(rectangle.lower_left)

+        width, height = tuple([abs(coord) for coord in self.scale_point((rectangle.width, rectangle.height))])

         

         if not self.invert:

-            ctx = self.ctx

-            ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

-            ctx.set_operator(cairo.OPERATOR_OVER if rectangle.level_polarity == "dark" else cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

+            self.ctx.set_operator(cairo.OPERATOR_OVER

+                             if rectangle.level_polarity == "dark"

+                             else cairo.OPERATOR_CLEAR)

         else:

-            ctx = self.mask_ctx

-            ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

-            ctx.set_operator(cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

+            self.ctx.set_operator(cairo.OPERATOR_CLEAR)

             

         if rectangle.rotation != 0:

-            ctx.save()

+            self.ctx.save()

             

             center = map(mul, rectangle.position, self.scale)

             matrix = cairo.Matrix()

             matrix.translate(center[0], center[1])

             # For drawing, we already handles the translation

-            ll[0] = ll[0] - center[0]

-            ll[1] = ll[1] - center[1]

+            lower_left[0] = lower_left[0] - center[0]

+            lower_left[1] = lower_left[1] - center[1]

             matrix.rotate(rectangle.rotation)

-            ctx.transform(matrix)

+            self.ctx.transform(matrix)

             

         if rectangle.hole_diameter > 0:

-            ctx.push_group()

+            self.ctx.push_group()

 

-        ctx.set_line_width(0)

-        ctx.rectangle(ll[0], ll[1], width, height)

-        ctx.fill()

+        self.ctx.set_line_width(0)

+        self.ctx.rectangle(lower_left[0], lower_left[1], width, height)

+        self.ctx.fill()

         

         if rectangle.hole_diameter > 0:

             # Render the center clear

-            ctx.set_source_rgba(color[0], color[1], color[2], self.alpha)

-            ctx.set_operator(cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(color[0], color[1], color[2], self.alpha)

+            self.ctx.set_operator(cairo.OPERATOR_CLEAR)

             center = map(mul, rectangle.position, self.scale)

-            ctx.arc(center[0], center[1], radius=rectangle.hole_radius * self.scale[0], angle1=0, angle2=2 * math.pi)

-            ctx.fill()

+            self.ctx.arc(center[0], center[1], radius=rectangle.hole_radius * self.scale[0], angle1=0, angle2=2 * math.pi)

+            self.ctx.fill()

             

-            ctx.pop_group_to_source()

-            ctx.paint_with_alpha(1)

+            self.ctx.pop_group_to_source()

+            self.ctx.paint_with_alpha(1)

         

         if rectangle.rotation != 0:

-            ctx.restore()
+            self.ctx.restore()
 

     def _render_obround(self, obround, color):

         

         if not self.invert:

-            ctx = self.ctx

-            ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

-            ctx.set_operator(cairo.OPERATOR_OVER if obround.level_polarity == "dark" else cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

+            self.ctx.set_operator(cairo.OPERATOR_OVER if obround.level_polarity == "dark" else cairo.OPERATOR_CLEAR)

         else:

-            ctx = self.mask_ctx

-            ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

-            ctx.set_operator(cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

+            self.ctx.set_operator(cairo.OPERATOR_CLEAR)

             

         if obround.hole_diameter > 0:

-            ctx.push_group()

+            self.ctx.push_group()

 

         self._render_circle(obround.subshapes['circle1'], color)

         self._render_circle(obround.subshapes['circle2'], color)

@@ -311,55 +314,54 @@ class GerberCairoContext(GerberContext):
         

         if obround.hole_diameter > 0:

             # Render the center clear

-            ctx.set_source_rgba(color[0], color[1], color[2], self.alpha)

-            ctx.set_operator(cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(color[0], color[1], color[2], self.alpha)

+            self.ctx.set_operator(cairo.OPERATOR_CLEAR)

             center = map(mul, obround.position, self.scale)

-            ctx.arc(center[0], center[1], radius=obround.hole_radius * self.scale[0], angle1=0, angle2=2 * math.pi)

-            ctx.fill()

+            self.ctx.arc(center[0], center[1], radius=obround.hole_radius * self.scale[0], angle1=0, angle2=2 * math.pi)

+            self.ctx.fill()

             

-            ctx.pop_group_to_source()

-            ctx.paint_with_alpha(1)

+            self.ctx.pop_group_to_source()

+            self.ctx.paint_with_alpha(1)

 

     def _render_polygon(self, polygon, color):

         

         # TODO Ths does not handle rotation of a polygon

         if not self.invert:

-            ctx = self.ctx

-            ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

-            ctx.set_operator(cairo.OPERATOR_OVER if polygon.level_polarity == "dark" else cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

+            self.ctx.set_operator(cairo.OPERATOR_OVER if polygon.level_polarity == "dark" else cairo.OPERATOR_CLEAR)

         else:

-            ctx = self.mask_ctx

-            ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

-            ctx.set_operator(cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

+            self.ctx.set_operator(cairo.OPERATOR_CLEAR)

             

         if polygon.hole_radius > 0:

-            ctx.push_group()

+            self.ctx.push_group()

         

         vertices = polygon.vertices 

 

-        ctx.set_line_width(0)

-        ctx.set_line_cap(cairo.LINE_CAP_ROUND)

+        self.ctx.set_line_width(0)

+        self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)

         

         # Start from before the end so it is easy to iterate and make sure it is closed

-        ctx.move_to(*map(mul, vertices[-1], self.scale))

+        self.ctx.move_to(*map(mul, vertices[-1], self.scale))

         for v in vertices:

-            ctx.line_to(*map(mul, v, self.scale))

+            self.ctx.line_to(*map(mul, v, self.scale))

 

-        ctx.fill()

+        self.ctx.fill()

         

         if polygon.hole_radius > 0:

             # Render the center clear

             center = tuple(map(mul, polygon.position, self.scale))

-            ctx.set_source_rgba(color[0], color[1], color[2], self.alpha)

-            ctx.set_operator(cairo.OPERATOR_CLEAR)        

-            ctx.set_line_width(0)

-            ctx.arc(center[0], center[1], polygon.hole_radius * self.scale[0], 0, 2 * math.pi)

-            ctx.fill()

+            self.ctx.set_source_rgba(color[0], color[1], color[2], self.alpha)

+            self.ctx.set_operator(cairo.OPERATOR_CLEAR)        

+            self.ctx.set_line_width(0)

+            self.ctx.arc(center[0], center[1], polygon.hole_radius * self.scale[0], 0, 2 * math.pi)

+            self.ctx.fill()

             

-            ctx.pop_group_to_source()

-            ctx.paint_with_alpha(1)

+            self.ctx.pop_group_to_source()

+            self.ctx.paint_with_alpha(1)

 

-    def _render_drill(self, circle, color):

+    def _render_drill(self, circle, color=None):

+        color = color if color is not None else self.drill_color

         self._render_circle(circle, color)

         

     def _render_slot(self, slot, color):

@@ -369,19 +371,17 @@ class GerberCairoContext(GerberContext):
         width = slot.diameter

         

         if not self.invert:

-            ctx = self.ctx

-            ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

-            ctx.set_operator(cairo.OPERATOR_OVER if slot.level_polarity == "dark" else cairo.OPERATOR_CLEAR)

+            self.ctx.set_source_rgba(color[0], color[1], color[2], alpha=self.alpha)

+            self.ctx.set_operator(cairo.OPERATOR_OVER if slot.level_polarity == "dark" else cairo.OPERATOR_CLEAR)

         else:

-            ctx = self.mask_ctx

-            ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

-            ctx.set_operator(cairo.OPERATOR_CLEAR)

-

-        ctx.set_line_width(width * self.scale[0])

-        ctx.set_line_cap(cairo.LINE_CAP_ROUND)

-        ctx.move_to(*start)

-        ctx.line_to(*end)

-        ctx.stroke()

+            self.ctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)

+            self.ctx.set_operator(cairo.OPERATOR_CLEAR)

+

+        self.ctx.set_line_width(width * self.scale[0])

+        self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)

+        self.ctx.move_to(*start)

+        self.ctx.line_to(*end)

+        self.ctx.stroke()

         

     def _render_amgroup(self, amgroup, color):

         self.ctx.push_group()

@@ -391,33 +391,52 @@ class GerberCairoContext(GerberContext):
         self.ctx.paint_with_alpha(1)

 

     def _render_test_record(self, primitive, color):

-        position = tuple(map(add, primitive.position, self.origin_in_inch))

+        position = [pos + origin for pos, origin in zip(primitive.position, self.origin_in_inch)]

         self.ctx.set_operator(cairo.OPERATOR_OVER)

-        self.ctx.select_font_face('monospace', cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_BOLD)

+        self.ctx.select_font_face(

+            'monospace', cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_BOLD)

         self.ctx.set_font_size(13)

         self._render_circle(Circle(position, 0.015), color)

         self.ctx.set_source_rgba(*color, alpha=self.alpha)

-        self.ctx.set_operator(cairo.OPERATOR_OVER if primitive.level_polarity == "dark" else cairo.OPERATOR_CLEAR)

-        self.ctx.move_to(*[self.scale[0] * (coord + 0.015) for coord in position])

+        self.ctx.set_operator(

+            cairo.OPERATOR_OVER if primitive.level_polarity == 'dark' else cairo.OPERATOR_CLEAR)

+        self.ctx.move_to(*[self.scale[0] * (coord + 0.015)

+                           for coord in position])

         self.ctx.scale(1, -1)

         self.ctx.show_text(primitive.net_name)

-        self.ctx.scale(1, -1)

-
-    def _clear_mask(self):
-        self.mask_ctx.set_operator(cairo.OPERATOR_OVER)

-        self.mask_ctx.set_source_rgba(self.background_color[0], self.background_color[1], self.background_color[2], alpha=self.alpha)

-        self.mask_ctx.paint()

-

-    def _render_mask(self):
-        self.ctx.set_operator(cairo.OPERATOR_OVER)

-        ptn = cairo.SurfacePattern(self.mask)

+        self.ctx.scale(1, -1)
+

+    def _new_render_layer(self, color=None):

+        size_in_pixels = self.scale_point(self.size_in_inch)

+        layer = cairo.SVGSurface(None, size_in_pixels[0], size_in_pixels[1])

+        ctx = cairo.Context(layer)

+        ctx.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)

+        ctx.scale(1, -1)

+        ctx.translate(-(self.origin_in_inch[0] * self.scale[0]),

+                           (-self.origin_in_inch[1] * self.scale[0])

+                           - size_in_pixels[1])

+        if self.invert:

+            ctx.set_operator(cairo.OPERATOR_OVER)

+            ctx.set_source_rgba(*self.color, alpha=self.alpha)

+            ctx.paint()

+        self.ctx = ctx

+        self.active_layer = layer

+

+    def _flatten(self):

+        self.output_ctx.set_operator(cairo.OPERATOR_OVER)

+        ptn = cairo.SurfacePattern(self.active_layer)
         ptn.set_matrix(self._xform_matrix)

-        self.ctx.set_source(ptn)

-        self.ctx.paint()

+        self.output_ctx.set_source(ptn)

+        self.output_ctx.paint()

+        self.ctx = None

+        self.active_layer = None

 

     def _paint_background(self, force=False):

-        if (not self.bg) or force:

-            self.bg = True
-            self.ctx.set_source_rgba(self.background_color[0], self.background_color[1], self.background_color[2], alpha=1.0)
-            self.ctx.paint()

-
+        if (not self.bg) or force:
+            self.bg = True

+            self.output_ctx.set_operator(cairo.OPERATOR_OVER)

+            self.output_ctx.set_source_rgba(self.background_color[0], self.background_color[1], self.background_color[2], alpha=1.0)

+            self.output_ctx.paint()

+

+    def scale_point(self, point):

+        return tuple([coord * scale for coord, scale in zip(point, self.scale)])
\ No newline at end of file
diff --git a/gerber/render/render.py b/gerber/render/render.py
index f521c44..7bd4c00 100644
--- a/gerber/render/render.py
+++ b/gerber/render/render.py
@@ -57,12 +57,14 @@ class GerberContext(object):
     alpha : float
         Rendering opacity. Between 0.0 (transparent) and 1.0 (opaque.)
     """
+
     def __init__(self, units='inch'):
         self._units = units
         self._color = (0.7215, 0.451, 0.200)
         self._background_color = (0.0, 0.0, 0.0)
         self._alpha = 1.0
         self._invert = False
+        self.ctx = None
 
     @property
     def units(self):
@@ -134,11 +136,10 @@ class GerberContext(object):
     def render(self, primitive):
         if not primitive:
             return
-        color = (self.color if primitive.level_polarity == 'dark'
-                 else self.background_color)
         
         self._pre_render_primitive(primitive)
         
+        color = self.color
         if isinstance(primitive, Line):
             self._render_line(primitive, color)
         elif isinstance(primitive, Arc):
@@ -180,6 +181,7 @@ class GerberContext(object):
         """
         return
 
+
     def _render_line(self, primitive, color):
         pass
 
@@ -215,9 +217,9 @@ class GerberContext(object):
 
 
 class RenderSettings(object):
+
     def __init__(self, color=(0.0, 0.0, 0.0), alpha=1.0, invert=False, mirror=False):
         self.color = color
         self.alpha = alpha
         self.invert = invert
         self.mirror = mirror
-
diff --git a/gerber/render/theme.py b/gerber/render/theme.py
index e538df8..6135ccb 100644
--- a/gerber/render/theme.py
+++ b/gerber/render/theme.py
@@ -23,7 +23,7 @@ COLORS = {
     'white': (1.0, 1.0, 1.0),
     'red': (1.0, 0.0, 0.0),
     'green': (0.0, 1.0, 0.0),
-    'blue' : (0.0, 0.0, 1.0),
+    'blue': (0.0, 0.0, 1.0),
     'fr-4': (0.290, 0.345, 0.0),
     'green soldermask': (0.0, 0.612, 0.396),
     'blue soldermask': (0.059, 0.478, 0.651),
@@ -36,6 +36,7 @@ COLORS = {
 
 
 class Theme(object):
+
     def __init__(self, name=None, **kwargs):
         self.name = 'Default' if name is None else name
         self.background = kwargs.get('background', RenderSettings(COLORS['black'], alpha=0.0))
@@ -67,4 +68,3 @@ THEMES = {
                   topmask=RenderSettings(COLORS['blue soldermask'], alpha=0.8, invert=True),
                   bottommask=RenderSettings(COLORS['blue soldermask'], alpha=0.8, invert=True)),
 }
-