20 files changed, 2413 insertions, 472 deletions
diff --git a/Makefile b/Makefile
index 8d3fd33..87f0124 100644
--- a/Makefile
+++ b/Makefile
@@ -31,4 +31,5 @@ doc-clean:
 .PHONY: examples
 examples:
 	PYTHONPATH=. $(PYTHON) examples/cairo_example.py
+	PYTHONPATH=. $(PYTHON) examples/pcb_example.py
 
diff --git a/examples/cairo_example.png b/examples/cairo_example.png
index fc4536a..f33cc69 100644
--- a/examples/cairo_example.png
+++ b/examples/cairo_example.png
diff --git a/examples/cairo_example.py b/examples/cairo_example.py
index f2f6723..14a7037 100644
--- a/examples/cairo_example.py
+++ b/examples/cairo_example.py
@@ -36,7 +36,6 @@ mask = read(os.path.join(GERBER_FOLDER, 'soldermask.GTS'))
 silk = read(os.path.join(GERBER_FOLDER, 'silkscreen.GTO'))
 drill = read(os.path.join(GERBER_FOLDER, 'ncdrill.DRD'))
 
-
 # Create a new drawing context
 ctx = GerberCairoContext()
 
diff --git a/examples/gerbers/bottom_copper.GBL b/examples/gerbers/bottom_copper.GBL
new file mode 100644
index 0000000..0d98da3
--- /dev/null
+++ b/examples/gerbers/bottom_copper.GBL
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diff --git a/examples/gerbers/bottom_mask.GBS b/examples/gerbers/bottom_mask.GBS
new file mode 100644
index 0000000..b06654f
--- /dev/null
+++ b/examples/gerbers/bottom_mask.GBS
@@ -0,0 +1,66 @@
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diff --git a/examples/gerbers/shld.drd b/examples/gerbers/shld.drd
deleted file mode 100644
index a919b5b..0000000
--- a/examples/gerbers/shld.drd
+++ /dev/null
@@ -1,354 +0,0 @@
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diff --git a/examples/pcb_bottom.png b/examples/pcb_bottom.png
new file mode 100644
index 0000000..1e8c369
--- /dev/null
+++ b/examples/pcb_bottom.png
diff --git a/examples/pcb_example.py b/examples/pcb_example.py
new file mode 100644
index 0000000..5341da0
--- /dev/null
+++ b/examples/pcb_example.py
@@ -0,0 +1,39 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright 2015 Hamilton Kibbe <ham@hamiltonkib.be>
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# 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 limitations under
+# the License.
+
+"""
+This example demonstrates the use of pcb-tools with cairo to render composite
+images using the PCB interface
+"""
+
+import os
+from gerber import PCB
+from gerber.render import GerberCairoContext, theme
+
+GERBER_FOLDER = os.path.abspath(os.path.join(os.path.dirname(__file__), 'gerbers'))
+
+
+# Create a new drawing context
+ctx = GerberCairoContext()
+
+# Create a new PCB
+pcb = PCB.from_directory(GERBER_FOLDER)
+
+pcb.theme = theme.THEMES['OSH Park']
+ctx.render_layers(pcb.top_layers, os.path.join(os.path.dirname(__file__), 'pcb_top.png'))
+ctx.render_layers(pcb.bottom_layers, os.path.join(os.path.dirname(__file__), 'pcb_bottom.png'))
+
diff --git a/examples/pcb_top.png b/examples/pcb_top.png
new file mode 100644
index 0000000..bf1d687
--- /dev/null
+++ b/examples/pcb_top.png
diff --git a/gerber/__init__.py b/gerber/__init__.py
index b5a9014..5cfdad7 100644
--- a/gerber/__init__.py
+++ b/gerber/__init__.py
@@ -23,4 +23,5 @@ gerber-tools provides utilities for working with Gerber (RS-274X) and Excellon
 files in python.
 """
 
-from .common import read, loads
-\ No newline at end of file
+from .common import read, loads
+from .pcb import PCB
diff --git a/gerber/common.py b/gerber/common.py
index f8979dc..04b6423 100644
--- a/gerber/common.py
+++ b/gerber/common.py
@@ -17,6 +17,7 @@
 
 from . import rs274x
 from . import excellon
+from . import ipc356
 from .exceptions import ParseError
 from .utils import detect_file_format
 
@@ -43,6 +44,8 @@ def read(filename):
         return rs274x.read(filename)
     elif fmt == 'excellon':
         return excellon.read(filename)
+    elif fmt == 'ipc_d_356':
+        return ipc356.read(filename)
     else:
         raise ParseError('Unable to detect file format')
 
diff --git a/gerber/exceptions.py b/gerber/exceptions.py
index fdd548c..65ae905 100644
--- a/gerber/exceptions.py
+++ b/gerber/exceptions.py
@@ -15,6 +15,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+
 class ParseError(Exception):
     pass
 
diff --git a/gerber/ipc356.py b/gerber/ipc356.py
index b8a7ba3..7dadd22 100644
--- a/gerber/ipc356.py
+++ b/gerber/ipc356.py
@@ -27,8 +27,11 @@ _NNAME = re.compile(r'^NNAME\d+$')
 # Board Edge Coordinates
 _COORD = re.compile(r'X?(?P<x>[\d\s]*)?Y?(?P<y>[\d\s]*)?')
 
-_SM_FIELD = {'0': 'none', '1': 'primary side', '2': 'secondary side', '3': 'both'}
-
+_SM_FIELD = {
+    '0': 'none',
+    '1': 'primary side',
+    '2': 'secondary side',
+    '3': 'both'}
 
 
 def read(filename):
@@ -51,17 +54,17 @@ def read(filename):
 class IPC_D_356(CamFile):
 
     @classmethod
-    def from_file(self, filename):
-        p = IPC_D_356_Parser()
-        return p.parse(filename)
-
+    def from_file(cls, filename):
+        parser = IPC_D_356_Parser()
+        return parser.parse(filename)
 
-    def __init__(self, statements, settings, primitives=None):
+    def __init__(self, statements, settings, primitives=None, filename=None):
         self.statements = statements
         self.units = settings.units
         self.angle_units = settings.angle_units
         self.primitives = [TestRecord((rec.x_coord, rec.y_coord), rec.net_name,
                                       rec.access) for rec in self.test_records]
+        self.filename = filename
 
     @property
     def settings(self):
@@ -95,8 +98,6 @@ class IPC_D_356(CamFile):
                     adjacent_nets.add(record.net)
             nets.append(IPC356_Net(net, adjacent_nets))
         return nets
-                
-                    
 
     @property
     def components(self):
@@ -109,14 +110,12 @@ class IPC_D_356(CamFile):
 
     @property
     def outlines(self):
-        return [stmt for stmt in self.statements 
+        return [stmt for stmt in self.statements
                 if isinstance(stmt, IPC356_Outline)]
 
-
-
     @property
     def adjacency_records(self):
-        return [record for record in self.statements 
+        return [record for record in self.statements
                 if isinstance(record, IPC356_Adjacency)]
 
     def render(self, ctx, layer='both', filename=None):
@@ -133,6 +132,7 @@ class IPC_D_356(CamFile):
 
 class IPC_D_356_Parser(object):
     # TODO: Allow multi-line statements (e.g. Altium board edge)
+
     def __init__(self):
         self.units = 'inch'
         self.angle_units = 'degrees'
@@ -158,8 +158,7 @@ class IPC_D_356_Parser(object):
                     oldline = line
         self._parse_line(oldline)
 
-        return IPC_D_356(self.statements, self.settings)
-
+        return IPC_D_356(self.statements, self.settings, filename=filename)
 
     def _parse_line(self, line):
         if not len(line):
@@ -201,18 +200,23 @@ class IPC_D_356_Parser(object):
 
         elif line[0:3] == '378':
             # Conductor
-            self.statements.append(IPC356_Conductor.from_line(line, self.settings))
-            
+            self.statements.append(
+                IPC356_Conductor.from_line(
+                    line, self.settings))
+
         elif line[0:3] == '379':
             # Net Adjacency
             self.statements.append(IPC356_Adjacency.from_line(line))
-            
+
         elif line[0:3] == '389':
             # Outline
-            self.statements.append(IPC356_Outline.from_line(line, self.settings))
+            self.statements.append(
+                IPC356_Outline.from_line(
+                    line, self.settings))
 
 
 class IPC356_Comment(object):
+
     @classmethod
     def from_line(cls, line):
         if line[0] != 'C':
@@ -228,6 +232,7 @@ class IPC356_Comment(object):
 
 
 class IPC356_Parameter(object):
+
     @classmethod
     def from_line(cls, line):
         if line[0] != 'P':
@@ -246,13 +251,14 @@ class IPC356_Parameter(object):
 
 
 class IPC356_TestRecord(object):
+
     @classmethod
     def from_line(cls, line, settings):
         offset = 0
         units = settings.units
         angle = settings.angle_units
-        feature_types = {'1':'through-hole', '2': 'smt',
-                         '3':'tooling-feature', '4':'tooling-hole'}
+        feature_types = {'1': 'through-hole', '2': 'smt',
+                         '3': 'tooling-feature', '4': 'tooling-hole'}
         access = ['both', 'top', 'layer2', 'layer3', 'layer4', 'layer5',
                   'layer6', 'layer7', 'bottom']
         record = {}
@@ -290,21 +296,21 @@ class IPC356_TestRecord(object):
         if len(line) >= (43 + offset):
             end = len(line) - 1 if len(line) < (50 + offset) else (49 + offset)
             coord = int(line[42 + offset:end].strip())
-            record['x_coord'] = (coord *  0.0001 if units == 'inch'
+            record['x_coord'] = (coord * 0.0001 if units == 'inch'
                                  else coord * 0.001)
 
         if len(line) >= (51 + offset):
             end = len(line) - 1 if len(line) < (58 + offset) else (57 + offset)
             coord = int(line[50 + offset:end].strip())
-            record['y_coord'] = (coord *  0.0001 if units == 'inch'
-            else coord * 0.001)
+            record['y_coord'] = (coord * 0.0001 if units == 'inch'
+                                 else coord * 0.001)
 
         if len(line) >= (59 + offset):
             end = len(line) - 1 if len(line) < (63 + offset) else (62 + offset)
             dim = line[58 + offset:end].strip()
             if dim != '':
                 record['rect_x'] = (int(dim) * 0.0001 if units == 'inch'
-                                else int(dim) * 0.001)
+                                    else int(dim) * 0.001)
 
         if len(line) >= (64 + offset):
             end = len(line) - 1 if len(line) < (68 + offset) else (67 + offset)
@@ -321,7 +327,7 @@ class IPC356_TestRecord(object):
                                            else math.degrees(rot))
 
         if len(line) >= (74 + offset):
-            end =  74 + offset
+            end = 74 + offset
             sm_info = line[73 + offset:end].strip()
             record['soldermask_info'] = _SM_FIELD.get(sm_info)
 
@@ -337,7 +343,8 @@ class IPC356_TestRecord(object):
 
     def __repr__(self):
         return '<IPC-D-356 %s Test Record: %s>' % (self.net_name,
-                                                            self.feature_type)
+                                                   self.feature_type)
+
 
 class IPC356_Outline(object):
 
@@ -365,24 +372,27 @@ class IPC356_Outline(object):
 
 
 class IPC356_Conductor(object):
+
     @classmethod
     def from_line(cls, line, settings):
         if line[0:3] != '378':
             raise ValueError('Not a valid IPC-D-356 Conductor statement')
-            
+
         scale = 0.0001 if settings.units == 'inch' else 0.001
         net_name = line[3:17].strip()
         layer = int(line[19:21])
-        
+
         # Parse out aperture definiting
         raw_aperture = line[22:].split()[0]
         aperture_dict = _COORD.match(raw_aperture).groupdict()
         x = 0
         y = 0
-        x = int(aperture_dict['x']) * scale if aperture_dict['x'] is not '' else None
-        y = int(aperture_dict['y']) * scale if aperture_dict['y'] is not '' else None
+        x = int(aperture_dict['x']) * \
+            scale if aperture_dict['x'] is not '' else None
+        y = int(aperture_dict['y']) * \
+            scale if aperture_dict['y'] is not '' else None
         aperture = (x, y)
-        
+
         # Parse out conductor shapes
         shapes = []
         coord_list = ' '.join(line[22:].split()[1:])
@@ -399,7 +409,7 @@ class IPC356_Conductor(object):
                 shape.append((x * scale, y * scale))
             shapes.append(tuple(shape))
         return cls(net_name, layer, aperture, tuple(shapes))
-        
+
     def __init__(self, net_name, layer, aperture, shapes):
         self.net_name = net_name
         self.layer = layer
@@ -417,18 +427,19 @@ class IPC356_Adjacency(object):
         if line[0:3] != '379':
             raise ValueError('Not a valid IPC-D-356 Conductor statement')
         nets = line[3:].strip().split()
-        
+
         return cls(nets[0], nets[1:])
 
     def __init__(self, net, adjacent_nets):
         self.net = net
         self.adjacent_nets = adjacent_nets
-        
+
     def __repr__(self):
         return '<IPC-D-356 %s Adjacency Record>' % self.net
 
 
 class IPC356_EndOfFile(object):
+
     def __init__(self):
         pass
 
@@ -437,12 +448,14 @@ class IPC356_EndOfFile(object):
 
     def __repr__(self):
         return '<IPC-D-356 EOF>'
-        
+
+
 class IPC356_Net(object):
+
     def __init__(self, name, adjacent_nets):
         self.name = name
-        self.adjacent_nets = set(adjacent_nets) if adjacent_nets is not None else set()
-        
+        self.adjacent_nets = set(
+            adjacent_nets) if adjacent_nets is not None else set()
 
     def __repr__(self):
         return '<IPC-D-356 Net %s>' % self.name
diff --git a/gerber/layers.py b/gerber/layers.py
index b10cf16..c6a5bf7 100644
--- a/gerber/layers.py
+++ b/gerber/layers.py
@@ -15,40 +15,212 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-top_copper_ext = ['gtl', 'cmp', 'top', ]
-top_copper_name = ['art01', 'top', 'GTL', 'layer1', 'soldcom', 'comp', ]
-
-bottom_copper_ext = ['gbl', 'sld', 'bot', 'sol', ]
-bottom_coppper_name = ['art02', 'bottom', 'bot', 'GBL', 'layer2', 'soldsold', ]
-
-internal_layer_ext = ['in', 'gt1', 'gt2', 'gt3', 'gt4', 'gt5', 'gt6', 'g1', 
-                      'g2', 'g3', 'g4', 'g5', 'g6', ]
-internal_layer_name = ['art', 'internal']
-
-power_plane_name = ['pgp', 'pwr', ]
-ground_plane_name = ['gp1', 'gp2', 'gp3', 'gp4', 'gt5', 'gp6', 'gnd', 
-                     'ground', ]
-
-top_silk_ext = ['gto', 'sst', 'plc', 'ts', 'skt', ]
-top_silk_name = ['sst01', 'topsilk', 'silk', 'slk', 'sst', ]
-
-bottom_silk_ext = ['gbo', 'ssb', 'pls', 'bs', 'skb', ]
-bottom_silk_name = ['sst', 'bsilk', 'ssb', 'botsilk', ]
-
-top_mask_ext = ['gts', 'stc', 'tmk', 'smt', 'tr', ]
-top_mask_name = ['sm01', 'cmask', 'tmask', 'mask1', 'maskcom', 'topmask', 
-                 'mst', ]
-
-bottom_mask_ext = ['gbs', 'sts', 'bmk', 'smb', 'br', ]
-bottom_mask_name = ['sm', 'bmask', 'mask2', 'masksold', 'botmask', 'msb', ]
-
-top_paste_ext = ['gtp', 'tm']
-top_paste_name = ['sp01', 'toppaste', 'pst']
-
-bottom_paste_ext = ['gbp', 'bm']
-bottom_paste_name = ['sp02', 'botpaste', 'psb']
-
-board_outline_ext = ['gko']
-board_outline_name = ['BDR', 'border', 'out', ]
-
-
+import os
+import re
+from collections import namedtuple
+
+from .excellon import ExcellonFile
+from .ipc356 import IPC_D_356
+from .render.render import Renderable
+
+Hint = namedtuple('Hint', 'layer ext name')
+
+hints = [
+    Hint(layer='top',
+         ext=['gtl', 'cmp', 'top', ],
+         name=['art01', 'top', 'GTL', 'layer1', 'soldcom', 'comp', ]
+         ),
+    Hint(layer='bottom',
+         ext=['gbl', 'sld', 'bot', 'sol', 'bottom', ],
+         name=['art02', 'bottom', 'bot', 'GBL', 'layer2', 'soldsold', ]
+         ),
+    Hint(layer='internal',
+         ext=['in', 'gt1', 'gt2', 'gt3', 'gt4', 'gt5', 'gt6', 'g1',
+              'g2', 'g3', 'g4', 'g5', 'g6', ],
+         name=['art', 'internal', 'pgp', 'pwr', 'gp1', 'gp2', 'gp3', 'gp4',
+               'gt5', 'gp6', 'gnd', 'ground', ]
+         ),
+    Hint(layer='topsilk',
+         ext=['gto', 'sst', 'plc', 'ts', 'skt', 'topsilk', ],
+         name=['sst01', 'topsilk', 'silk', 'slk', 'sst', ]
+         ),
+    Hint(layer='bottomsilk',
+         ext=['gbo', 'ssb', 'pls', 'bs', 'skb', 'bottomsilk', ],
+         name=['bsilk', 'ssb', 'botsilk', ]
+         ),
+    Hint(layer='topmask',
+         ext=['gts', 'stc', 'tmk', 'smt', 'tr', 'topmask', ],
+         name=['sm01', 'cmask', 'tmask', 'mask1', 'maskcom', 'topmask',
+               'mst', ]
+         ),
+    Hint(layer='bottommask',
+         ext=['gbs', 'sts', 'bmk', 'smb', 'br', 'bottommask', ],
+         name=['sm', 'bmask', 'mask2', 'masksold', 'botmask', 'msb', ]
+         ),
+    Hint(layer='toppaste',
+         ext=['gtp', 'tm', 'toppaste', ],
+         name=['sp01', 'toppaste', 'pst']
+         ),
+    Hint(layer='bottompaste',
+         ext=['gbp', 'bm', 'bottompaste', ],
+         name=['sp02', 'botpaste', 'psb']
+         ),
+    Hint(layer='outline',
+         ext=['gko', 'outline', ],
+         name=['BDR', 'border', 'out', ]
+         ),
+    Hint(layer='ipc_netlist',
+         ext=['ipc'],
+         name=[],
+         ),
+]
+
+
+def guess_layer_class(filename):
+    try:
+        directory, name = os.path.split(filename)
+        name, ext = os.path.splitext(name.lower())
+        for hint in hints:
+            patterns = [r'^(\w*[.-])*{}([.-]\w*)?$'.format(x) for x in hint.name]
+            if ext[1:] in hint.ext or any(re.findall(p, name, re.IGNORECASE) for p in patterns):
+                return hint.layer
+    except:
+        pass
+    return 'unknown'
+
+
+def sort_layers(layers):
+    layer_order = ['outline', 'toppaste', 'topsilk', 'topmask', 'top',
+                   'internal', 'bottom', 'bottommask', 'bottomsilk',
+                   'bottompaste', 'drill', ]
+    output = []
+    drill_layers = [layer for layer in layers if layer.layer_class == 'drill']
+    internal_layers = list(sorted([layer for layer in layers if layer.layer_class == 'internal']))
+
+    for layer_class in layer_order:
+        if layer_class == 'internal':
+            output += internal_layers
+        elif layer_class == 'drill':
+            output += drill_layers
+        else:
+            for layer in layers:
+                if layer.layer_class == layer_class:
+                    output.append(layer)
+    return output
+
+
+class PCBLayer(Renderable):
+    """ Base class for PCB Layers
+
+    Parameters
+    ----------
+    source : CAMFile
+        CAMFile representing the layer
+
+
+    Attributes
+    ----------
+    filename : string
+        Source Filename
+
+    """
+    @classmethod
+    def from_gerber(cls, camfile):
+        filename = camfile.filename
+        layer_class = guess_layer_class(filename)
+        if isinstance(camfile, ExcellonFile) or (layer_class == 'drill'):
+            return DrillLayer.from_gerber(camfile)
+        elif layer_class == 'internal':
+            return InternalLayer.from_gerber(camfile)
+        if isinstance(camfile, IPC_D_356):
+            layer_class = 'ipc_netlist'
+        return cls(filename, layer_class, camfile)
+
+    def __init__(self, filename=None, layer_class=None, cam_source=None, **kwargs):
+        super(PCBLayer, self).__init__(**kwargs)
+        self.filename = filename
+        self.layer_class = layer_class
+        self.cam_source = cam_source
+        self.surface = None
+        self.primitives = cam_source.primitives if cam_source is not None else []
+
+    @property
+    def bounds(self):
+        if self.cam_source is not None:
+            return self.cam_source.bounds
+        else:
+            return None
+
+
+class DrillLayer(PCBLayer):
+    @classmethod
+    def from_gerber(cls, camfile):
+        return cls(camfile.filename, camfile)
+
+    def __init__(self, filename=None, cam_source=None, layers=None, **kwargs):
+        super(DrillLayer, self).__init__(filename, 'drill', cam_source, **kwargs)
+        self.layers = layers if layers is not None else ['top', 'bottom']
+
+
+class InternalLayer(PCBLayer):
+    @classmethod
+    def from_gerber(cls, camfile):
+        filename = camfile.filename
+        try:
+            order = int(re.search(r'\d+', filename).group())
+        except:
+            order = 0
+        return cls(filename, camfile, order)
+
+    def __init__(self, filename=None, cam_source=None, order=0, **kwargs):
+        super(InternalLayer, self).__init__(filename, 'internal', cam_source, **kwargs)
+        self.order = order
+
+    def __eq__(self, other):
+        if not hasattr(other, 'order'):
+            raise TypeError()
+        return (self.order == other.order)
+
+    def __ne__(self, other):
+        if not hasattr(other, 'order'):
+            raise TypeError()
+        return (self.order != other.order)
+
+    def __gt__(self, other):
+        if not hasattr(other, 'order'):
+            raise TypeError()
+        return (self.order > other.order)
+
+    def __lt__(self, other):
+        if not hasattr(other, 'order'):
+            raise TypeError()
+        return (self.order < other.order)
+
+    def __ge__(self, other):
+        if not hasattr(other, 'order'):
+            raise TypeError()
+        return (self.order >= other.order)
+
+    def __le__(self, other):
+        if not hasattr(other, 'order'):
+            raise TypeError()
+        return (self.order <= other.order)
+
+
+class LayerSet(Renderable):
+    def __init__(self, name, layers, **kwargs):
+        super(LayerSet, self).__init__(**kwargs)
+        self.name = name
+        self.layers = list(layers)
+
+    def __len__(self):
+        return len(self.layers)
+
+    def __getitem__(self, item):
+        return self.layers[item]
+
+    def to_render(self):
+        return self.layers
+
+    def apply_theme(self, theme):
+        pass
diff --git a/gerber/pcb.py b/gerber/pcb.py
new file mode 100644
index 0000000..990a05c
--- /dev/null
+++ b/gerber/pcb.py
@@ -0,0 +1,107 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# copyright 2015 Hamilton Kibbe <ham@hamiltonkib.be>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# 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
+# limitations under the License.
+
+
+import os
+from .exceptions import ParseError
+from .layers import PCBLayer, LayerSet, sort_layers
+from .common import read as gerber_read
+from .utils import listdir
+from .render import theme
+
+
+class PCB(object):
+
+    @classmethod
+    def from_directory(cls, directory, board_name=None, verbose=False):
+        layers = []
+        names = set()
+        # Validate
+        directory = os.path.abspath(directory)
+        if not os.path.isdir(directory):
+            raise TypeError('{} is not a directory.'.format(directory))
+        # Load gerber files
+        for filename in listdir(directory, True, True):
+            try:
+                camfile = gerber_read(os.path.join(directory, filename))
+                layer = PCBLayer.from_gerber(camfile)
+                layers.append(layer)
+                names.add(os.path.splitext(filename)[0])
+                if verbose:
+                    print('Added {} layer <{}>'.format(layer.layer_class, filename))
+            except ParseError:
+                if verbose:
+                    print('Skipping file {}'.format(filename))
+        # Try to guess board name
+        if board_name is None:
+            if len(names) == 1:
+                board_name = names.pop()
+            else:
+                board_name = os.path.basename(directory)
+        # Return PCB
+        return cls(layers, board_name)
+
+    def __init__(self, layers, name=None):
+        self.layers = sort_layers(layers)
+        self.name = name
+        self._theme = theme.THEMES['Default']
+        self.theme = self._theme
+
+    def __len__(self):
+        return len(self.layers)
+
+    @property
+    def theme(self):
+        return self._theme
+
+    @theme.setter
+    def theme(self, theme):
+        self._theme = theme
+        for layer in self.layers:
+            layer.settings = theme[layer.layer_class]
+
+    @property
+    def top_layers(self):
+        board_layers = [l for l in reversed(self.layers) if l.layer_class in ('topsilk', 'topmask', 'top')]
+        drill_layers = [l for l in self.drill_layers if 'top' in l.layers]
+        return board_layers + drill_layers
+
+    @property
+    def bottom_layers(self):
+        board_layers = [l for l in self.layers if l.layer_class in ('bottomsilk', 'bottommask', 'bottom')]
+        drill_layers = [l for l in self.drill_layers if 'bottom' in l.layers]
+        return board_layers + drill_layers
+
+    @property
+    def drill_layers(self):
+        return [l for l in self.layers if l.layer_class == 'drill']
+
+    @property
+    def layer_count(self):
+        """ Number of *COPPER* layers
+        """
+        return len([l for l in self.layers if l.layer_class in ('top', 'bottom', 'internal')])
+
+    @property
+    def board_bounds(self):
+        for layer in self.layers:
+            if layer.layer_class == 'outline':
+                return layer.bounds
+        for layer in self.layers:
+            if layer.layer_class == 'top':
+                return layer.bounds
+
diff --git a/gerber/render/cairo_backend.py b/gerber/render/cairo_backend.py
index 8283ae0..7acf29a 100644
--- a/gerber/render/cairo_backend.py
+++ b/gerber/render/cairo_backend.py
@@ -17,7 +17,7 @@
 
 
 import cairocffi as cairo
-from operator import mul
+from operator import mul, div
 import math
 import tempfile
 
@@ -39,16 +39,16 @@ class GerberCairoContext(GerberContext):
         self.bg = False
         self.mask = None
         self.mask_ctx = None
-        self.origin_in_pixels = None
-        self.size_in_pixels = None
+        self.origin_in_inch = None
+        self.size_in_inch = None
 
-    def set_bounds(self, bounds):
+    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 = map(mul, size_in_inch, self.scale)
-        self.origin_in_pixels = tuple(map(mul, origin_in_inch, self.scale)) if self.origin_in_pixels is None else self.origin_in_pixels
-        self.size_in_pixels = size_in_pixels if self.size_in_pixels is None else self.size_in_pixels
-        if self.surface is None:
+        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)
@@ -61,6 +61,36 @@ class GerberCairoContext(GerberContext):
             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])
 
+    def render_layers(self, layers, filename):
+        """ Render a set of layers
+        """
+        self.set_bounds(layers[0].bounds, True)
+        self._paint_background(True)
+        for layer in layers:
+            self._render_layer(layer)
+        self.dump(filename)
+
+    @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)
+
+    @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)
+
+    def _render_layer(self, layer):
+        self.color = layer.settings.color
+        self.alpha = layer.settings.alpha
+        self.invert = layer.settings.invert
+        if layer.settings.mirror:
+            raise Warning('mirrored layers aren\'t supported yet...')
+        if self.invert:
+            self._clear_mask()
+        for p in layer.primitives:
+            self.render(p)
+        if self.invert:
+            self._render_mask()
+
     def _render_line(self, line, color):
         start = map(mul, line.start, self.scale)
         end = map(mul, line.end, self.scale)
@@ -178,12 +208,13 @@ class GerberCairoContext(GerberContext):
         self._render_circle(circle, color)
 
     def _render_test_record(self, primitive, color):
-        self.ctx.select_font_face('monospace', cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_NORMAL)
-        self.ctx.set_font_size(200)
-        self._render_circle(Circle(primitive.position, 0.01), color)
+        position = tuple(map(add, primitive.position, self.origin_in_inch))
+        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_rgb(*color)
         self.ctx.set_operator(cairo.OPERATOR_OVER if primitive.level_polarity == "dark" else cairo.OPERATOR_CLEAR)
-        self.ctx.move_to(*[self.scale[0] * (coord + 0.01) for coord in primitive.position])
+        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)
@@ -196,14 +227,15 @@ class GerberCairoContext(GerberContext):
     def _render_mask(self):
         self.ctx.set_operator(cairo.OPERATOR_OVER)
         ptn = cairo.SurfacePattern(self.mask)
-        ptn.set_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]))
+        ptn.set_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.ctx.set_source(ptn)
         self.ctx.paint()
 
-    def _paint_background(self):
-        if not self.bg:
+    def _paint_background(self, force=False):
+        if (not self.bg) or force:
             self.bg = True
-            self.ctx.set_source_rgba(*self.background_color)
+            self.ctx.set_source_rgba(*self.background_color, alpha=1.0)
             self.ctx.paint()
 
     def dump(self, filename):
diff --git a/gerber/render/render.py b/gerber/render/render.py
index 737061e..c76ead5 100644
--- a/gerber/render/render.py
+++ b/gerber/render/render.py
@@ -60,7 +60,6 @@ class GerberContext(object):
     def __init__(self, units='inch'):
         self._units = units
         self._color = (0.7215, 0.451, 0.200)
-        self._drill_color = (0.25, 0.25, 0.25)
         self._background_color = (0.0, 0.0, 0.0)
         self._alpha = 1.0
         self._invert = False
@@ -150,7 +149,7 @@ class GerberContext(object):
         elif isinstance(primitive, Polygon):
             self._render_polygon(primitive, color)
         elif isinstance(primitive, Drill):
-            self._render_drill(primitive, self.drill_color)
+            self._render_drill(primitive, color)
         elif isinstance(primitive, TestRecord):
             self._render_test_record(primitive, color)
         else:
@@ -185,15 +184,7 @@ class GerberContext(object):
 
 
 class Renderable(object):
-    def __init__(self, color=None, alpha=None, invert=False):
-        self.color = color
-        self.alpha = alpha
-        self.invert = invert
-
-    def to_render(self):
-        """ Override this in subclass. Should return a list of Primitives or Renderables
-        """
-        raise NotImplementedError('to_render() must be implemented in subclass')
-
-    def apply_theme(self, theme):
-        raise NotImplementedError('apply_theme() must be implemented in subclass')
+    def __init__(self, settings=None):
+        self.settings = settings
+        self.primitives = []
+
diff --git a/gerber/render/theme.py b/gerber/render/theme.py
index eae3735..5978831 100644
--- a/gerber/render/theme.py
+++ b/gerber/render/theme.py
@@ -19,6 +19,9 @@
 COLORS = {
     'black': (0.0, 0.0, 0.0),
     '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),
     'fr-4': (0.290, 0.345, 0.0),
     'green soldermask': (0.0, 0.612, 0.396),
     'blue soldermask': (0.059, 0.478, 0.651),
@@ -31,29 +34,38 @@ COLORS = {
 
 
 class RenderSettings(object):
-    def __init__(self, color, alpha=1.0, invert=False):
+    def __init__(self, color, alpha=1.0, invert=False, mirror=False):
         self.color = color
         self.alpha = alpha
-        self.invert = False
+        self.invert = invert
+        self.mirror = mirror
 
 
 class Theme(object):
-    def __init__(self, **kwargs):
-        self.background = kwargs.get('background', RenderSettings(COLORS['black'], 0.0))
+    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))
         self.topsilk = kwargs.get('topsilk', RenderSettings(COLORS['white']))
         self.bottomsilk = kwargs.get('bottomsilk', RenderSettings(COLORS['white']))
-        self.topmask = kwargs.get('topmask', RenderSettings(COLORS['green soldermask'], 0.8, True))
-        self.bottommask = kwargs.get('bottommask', RenderSettings(COLORS['green soldermask'], 0.8, True))
+        self.topmask = kwargs.get('topmask', RenderSettings(COLORS['green soldermask'], alpha=0.8, invert=True))
+        self.bottommask = kwargs.get('bottommask', RenderSettings(COLORS['green soldermask'], alpha=0.8, invert=True))
         self.top = kwargs.get('top', RenderSettings(COLORS['hasl copper']))
         self.bottom = kwargs.get('top', RenderSettings(COLORS['hasl copper']))
-        self.drill = kwargs.get('drill', self.background)
+        self.drill = kwargs.get('drill', RenderSettings(COLORS['black']))
+        self.ipc_netlist = kwargs.get('ipc_netlist', RenderSettings(COLORS['red']))
 
+    def __getitem__(self, key):
+        return getattr(self, key)
 
 THEMES = {
     'Default': Theme(),
-    'Osh Park': Theme(top=COLORS['enig copper'],
-                      bottom=COLORS['enig copper'],
-                      topmask=COLORS['purple soldermask'],
-                      bottommask=COLORS['purple soldermask']),
+    'OSH Park': Theme(name='OSH Park',
+                      top=RenderSettings(COLORS['enig copper']),
+                      bottom=RenderSettings(COLORS['enig copper']),
+                      topmask=RenderSettings(COLORS['purple soldermask'], alpha=0.8, invert=True),
+                      bottommask=RenderSettings(COLORS['purple soldermask'], alpha=0.8, invert=True)),
+    'Blue': Theme(name='Blue',
+                  topmask=RenderSettings(COLORS['blue soldermask'], alpha=0.8, invert=True),
+                  bottommask=RenderSettings(COLORS['blue soldermask'], alpha=0.8, invert=True)),
 }
 
diff --git a/gerber/tests/test_layers.py b/gerber/tests/test_layers.py
new file mode 100644
index 0000000..c77084d
--- /dev/null
+++ b/gerber/tests/test_layers.py
@@ -0,0 +1,33 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Author: Hamilton Kibbe <ham@hamiltonkib.be>
+
+from .tests import *
+from ..layers import guess_layer_class, hints
+
+
+def test_guess_layer_class():
+    """ Test layer type inferred correctly from filename
+    """
+
+    # Add any specific test cases here (filename, layer_class)
+    test_vectors = [(None, 'unknown'), ('NCDRILL.TXT', 'unknown'),
+                    ('example_board.gtl', 'top'),
+                    ('exampmle_board.sst', 'topsilk'),
+                    ('ipc-d-356.ipc', 'ipc_netlist'),]
+
+    for hint in hints:
+        for ext in hint.ext:
+            assert_equal(hint.layer, guess_layer_class('board.{}'.format(ext)))
+        for name in hint.name:
+            assert_equal(hint.layer, guess_layer_class('{}.pho'.format(name)))
+
+    for filename, layer_class in test_vectors:
+        assert_equal(layer_class, guess_layer_class(filename))
+
+
+def test_sort_layers():
+    """ Test layer ordering
+    """
+    pass
diff --git a/gerber/utils.py b/gerber/utils.py
index 1c0af52..6653683 100644
--- a/gerber/utils.py
+++ b/gerber/utils.py
@@ -26,6 +26,7 @@ files.
 # Author: Hamilton Kibbe <ham@hamiltonkib.be>
 # License:
 
+import os
 from math import radians, sin, cos
 from operator import sub
 
@@ -219,7 +220,10 @@ def detect_file_format(data):
         if 'M48' in line:
             return 'excellon'
         elif '%FS' in line:
-            return'rs274x'
+            return 'rs274x'
+        elif ((len(line.split()) >= 2) and
+             (line.split()[0] == 'P') and (line.split()[1] == 'JOB')):
+            return 'ipc_d_356'
     return 'unknown'
 
 
@@ -288,3 +292,13 @@ def rotate_point(point, angle, center=(0.0, 0.0)):
     x = center[0] + (cos(angle) * xdelta) - (sin(angle) * ydelta)
     y = center[1] + (sin(angle) * xdelta) - (cos(angle) * ydelta)
     return (x, y)
+
+
+def listdir(directory, ignore_hidden=True, ignore_os=True):
+    os_files = ('.DS_Store', 'Thumbs.db', 'ethumbs.db')
+    files = os.listdir(directory)
+    if ignore_hidden:
+        files = [f for f in files if not f.startswith('.')]
+    if ignore_os:
+        files = [f for f in files if not f in os_files]
+    return files