Merge pull request #40 from curtacircuitos/cairo-render-unification

Cairo render unification

1 files changed, 74 insertions, 40 deletions

diff --git a/gerber/render/cairo_backend.py b/gerber/render/cairo_backend.py
index fa1aecc..a97e552 100644
--- a/gerber/render/cairo_backend.py
+++ b/gerber/render/cairo_backend.py
@@ -16,53 +16,45 @@
 # limitations under the License.

 

 from .render import GerberContext

-from operator import mul

+

 import cairocffi as cairo

+

+from operator import mul

 import math

+import tempfile

 

 from ..primitives import *

 

-SCALE = 4000.

-

-

 class GerberCairoContext(GerberContext):

-    def __init__(self, surface=None, size=(10000, 10000)):

+    def __init__(self, scale=300):

         GerberContext.__init__(self)

-        if surface is None:

-            self.surface = cairo.ImageSurface(cairo.FORMAT_ARGB32,

-                                              size[0], size[1])

-        else:

-            self.surface = surface

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

-        self.size = size

-        self.ctx.translate(0, self.size[1])

-        self.scale = (SCALE,SCALE)

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

-        self.apertures = {}

-        self.background = False

-

+        self.scale = (scale, scale)

+        self.surface = None

+        self.ctx = None

+        self.bg = False

+        

     def set_bounds(self, bounds):

-        if not self.background:

-            xbounds, ybounds = bounds

-            width = SCALE * (xbounds[1] - xbounds[0])

-            height = SCALE * (ybounds[1] - ybounds[0])

-            self.surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, int(width), int(height))

+        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)

+

+        if self.surface is None:

+            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.translate(0, height)

-            self.scale = (SCALE,SCALE)

+            self.ctx.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)

             self.ctx.scale(1, -1)

-            self.ctx.rectangle(SCALE * xbounds[0], SCALE * ybounds[0], width, height)

-            self.ctx.set_source_rgb(0,0,0)

-            self.ctx.fill()

-            self.background = True

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

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

 

     def _render_line(self, line, color):

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

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

         if isinstance(line.aperture, Circle):

-            width = line.aperture.diameter if line.aperture.diameter != 0 else 0.001

+            width = line.aperture.diameter

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

-            self.ctx.set_line_width(width * SCALE)

+            self.ctx.set_operator(cairo.OPERATOR_OVER if (line.level_polarity == "dark" and not self.invert) else 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)

@@ -70,6 +62,7 @@ class GerberCairoContext(GerberContext):
         elif isinstance(line.aperture, Rectangle):

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

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

+            self.ctx.set_operator(cairo.OPERATOR_OVER if (line.level_polarity == "dark" and not self.invert) else cairo.OPERATOR_CLEAR)

             self.ctx.set_line_width(0)

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

             for point in points[1:]:

@@ -80,12 +73,13 @@ class GerberCairoContext(GerberContext):
         center = map(mul, arc.center, self.scale)

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

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

-        radius = SCALE * arc.radius

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

         angle1 = arc.start_angle

         angle2 = arc.end_angle

         width = arc.aperture.diameter if arc.aperture.diameter != 0 else 0.001

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

-        self.ctx.set_line_width(width * SCALE)

+        self.ctx.set_operator(cairo.OPERATOR_OVER if (arc.level_polarity == "dark" and not self.invert)else 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)  # You actually have to do this...

         if arc.direction == 'counterclockwise':

@@ -95,25 +89,40 @@ class GerberCairoContext(GerberContext):
         self.ctx.move_to(*end)  # ...lame

 

     def _render_region(self, region, color):

-        points = [tuple(map(mul, point, self.scale)) for point in region.points]

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

+        self.ctx.set_operator(cairo.OPERATOR_OVER if (region.level_polarity == "dark" and not self.invert) else cairo.OPERATOR_CLEAR)

         self.ctx.set_line_width(0)

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

-        for point in points[1:]:

-            self.ctx.line_to(*point)

+        self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)

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

+        for p in region.primitives:

+            if isinstance(p, Line):

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

+            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':

+                    self.ctx.arc(*center, radius=radius, angle1=angle1, angle2=angle2)

+                else:

+                    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))

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

+        self.ctx.set_operator(cairo.OPERATOR_OVER if (circle.level_polarity == "dark" and not self.invert) else cairo.OPERATOR_CLEAR)        

         self.ctx.set_line_width(0)

-        self.ctx.arc(*center, radius=circle.radius * SCALE, angle1=0, angle2=2 * math.pi)

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

         self.ctx.fill()

 

     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)))

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

+        self.ctx.set_operator(cairo.OPERATOR_OVER if (rectangle.level_polarity == "dark" and not self.invert) else cairo.OPERATOR_CLEAR)        

         self.ctx.set_line_width(0)

         self.ctx.rectangle(*ll,width=width, height=height)

         self.ctx.fill()

@@ -131,10 +140,35 @@ class GerberCairoContext(GerberContext):
         self.ctx.set_font_size(200)

         self._render_circle(Circle(primitive.position, 0.01), color)

         self.ctx.set_source_rgb(*color)

-        self.ctx.move_to(*[SCALE * (coord + 0.01) for coord in primitive.position])

+        self.ctx.set_operator(cairo.OPERATOR_OVER if (primitive.level_polarity == "dark" and not self.invert) else cairo.OPERATOR_CLEAR)        

+        self.ctx.move_to(*[self.scale[0] * (coord + 0.01) for coord in primitive.position])

         self.ctx.scale(1, -1)

         self.ctx.show_text(primitive.net_name)

         self.ctx.scale(1, -1)

 

+    def _paint_inverted_layer(self):

+        self.ctx.set_source_rgba(*self.background_color)

+        self.ctx.set_operator(cairo.OPERATOR_OVER)

+        self.ctx.paint()

+        self.ctx.set_operator(cairo.OPERATOR_CLEAR)

+

+    def _paint_background(self):

+        if not self.bg:

+            self.bg = True

+            self.ctx.set_source_rgba(*self.background_color)

+            self.ctx.paint()

+

     def dump(self, filename):

-        self.surface.write_to_png(filename)

+        is_svg = filename.lower().endswith(".svg")

+

+        if is_svg:

+            self.surface.finish()

+            self.surface_buffer.flush()

+

+            with open(filename, "w") as f:

+                self.surface_buffer.seek(0)

+                f.write(self.surface_buffer.read())

+                f.flush()

+

+        else:

+            self.surface.write_to_png(filename)