import tempfile import os.path as path from pathlib import Path import textwrap import subprocess import functools import os import base64 import re import sys import warnings import shutil from zipfile import ZipFile, is_zipfile from lxml import etree import gerber from gerber.render.cairo_backend import GerberCairoContext import gerberex import gerberex.rs274x import numpy as np import click from slugify import slugify @click.group() def cli(): pass @cli.command() @click.argument('input_gerbers') @click.argument('output_gerbers') @click.option('-t', '--top', help='Top side SVG overlay') @click.option('-b', '--bottom', help='Bottom side SVG overlay') @click.option('--bbox', help='Output file bounding box. Format: "w,h" to force [w] mm by [h] mm output canvas OR ' '"x,y,w,h" to force [w] mm by [h] mm output canvas with its bottom left corner at the given input gerber ' 'coördinates. MUST MATCH --bbox GIVEN TO PREVIEW') @click.option('--dilate', default=0.1, help='Default dilation for subtraction operations in mm') @click.option('--no-subtract', 'no_subtract', flag_value=True, help='Disable subtraction') @click.option('--subtract', help='Use user subtraction script from argument (see description above)') #@click.option('--mask-clips-silk/--silk-clips-mask', default=True, help='Set clipping order of mask and silk') #@click.option('--copper-clips-copper/--no-copper-clips-copper', default=True, help='Set whether output copper features clip input copper features') @click.option('--trace-space', type=float, default=0.1, help='passed through to svg-flatten') @click.option('--vectorizer', help='passed through to svg-flatten') @click.option('--vectorizer-map', help='passed through to svg-flatten') @click.option('--exclude-groups', help='passed through to svg-flatten') def paste(input_gerbers, output_gerbers, top, bottom, bbox, dilate, no_subtract, subtract, trace_space, vectorizer, vectorizer_map, exclude_groups): """ Render vector data and raster images from SVG file into gerbers. """ if no_subtract: subtract_map = {} else: subtract_map = parse_subtract_script(subtract, dilate) if not top and not bottom: raise click.UsageError('Either --top or --bottom must be given') with tempfile.TemporaryDirectory() as tmpdir: tmpdir = Path(tmpdir) output_gerbers = Path(output_gerbers) input_gerbers = Path(input_gerbers) source = unpack_if_necessary(input_gerbers, tmpdir) matches = match_gerbers_in_dir(source) if input_gerbers.is_dir(): output_gerbers.mkdir(exist_ok=True) for side, in_svg in [('top', top), ('bottom', bottom)]: if not in_svg: continue print() print('#########################################') print('processing side', side, 'infile', in_svg) print('#########################################') print() if not matches[side]: warnings.warn(f'No input gerber files found for {side} side') continue try: units, layers = load_side(matches[side]) except SystemError as e: raise click.UsageError(e.args) print('loaded layers:', list(layers.keys())) bounds = get_bounds(bbox, layers) print('bounds:', bounds) @functools.lru_cache() def do_dilate(layer, amount): print('dilating', layer, 'by', amount) outfile = tmpdir / 'dilated-{layer}-{amount}.gbr' dilate_gerber(layers, layer, amount, bbox, tmpdir, outfile, units) gbr = gerberex.read(str(outfile)) gbr.offset(bounds[0][0], bounds[1][0]) return gbr for layer, input_files in layers.items(): if layer == 'drill': continue (in_grb_path, in_grb), = input_files print() print('-----------------------------------------') print('processing side', side, 'layer', layer) print('-----------------------------------------') print() print('rendering layer', layer) overlay_file = tmpdir / f'overlay-{side}-{layer}.gbr' svg_to_gerber(in_svg, overlay_file, layer, trace_space, vectorizer, vectorizer_map, exclude_groups) overlay_grb = gerberex.read(str(overlay_file)) if not overlay_grb.primitives: print(f'Overlay layer {layer} does not contain anything. Skipping.', file=sys.stderr) continue print('compositing') comp = gerberex.GerberComposition() foo = gerberex.rs274x.GerberFile.from_gerber_file(in_grb.cam_source) comp.merge(foo) overlay_grb.offset(bounds[0][0], bounds[1][0]) comp.merge(overlay_grb) dilations = subtract_map.get(layer, []) for d_layer, amount in dilations: print('processing dilation', d_layer, amount) dilated = do_dilate(d_layer, amount) comp.merge(dilated) if input_gerbers.is_dir(): this_out = output_gerbers / in_grb_path.name else: this_out = output_gerbers print('dumping to', this_out) comp.dump(this_out) if input_gerbers.is_dir(): for in_file in source.iterdir(): out_cand = output_gerbers / in_file.name if not out_cand.is_file(): print(f'Input file {in_file.name} remained unprocessed. Copying.', file=sys.stderr) shutil.copy(in_file, out_cand) @cli.command() @click.argument('input') @click.option('-t' ,'--top', help='Top layer output file.') @click.option('-b' ,'--bottom', help='Bottom layer output file. --top or --bottom may be given at once. If neither is given, autogenerate filenames.') @click.option('--vector/--raster', help='Embed preview renders into output file as SVG vector graphics instead of rendering them to PNG bitmaps. The resulting preview may slow down your SVG editor.') @click.option('--raster-dpi', type=float, default=300.0, help='DPI for rastering preview') @click.option('--bbox', help='Output file bounding box. Format: "w,h" to force [w] mm by [h] mm output canvas OR ' '"x,y,w,h" to force [w] mm by [h] mm output canvas with its bottom left corner at the given input gerber ' 'coördinates.') def template(input, top, bottom, bbox, vector, raster_dpi): ''' Generate SVG template for gerbolyze paste from gerber files. INPUT may be a gerber file, directory of gerber files or zip file with gerber files ''' with tempfile.TemporaryDirectory() as tmpdir: tmpdir = Path(tmpdir) source = Path(input) if not top and not bottom: # autogenerate two file names if neither --top nor --bottom are given # /path/to/gerber/dir -> /path/to/gerber/dir.preview-{top|bottom}.svg # /path/to/gerbers.zip -> /path/to/gerbers.zip.preview-{top|bottom}.svg # /path/to/single/file.grb -> /path/to/single/file.grb.preview-{top|bottom}.svg outfiles = { 'top': source.parent / f'{source.name}.preview-top.svg', 'bottom': source.parent / f'{source.name}.preview-top.svg' } else: outfiles = { 'top': Path(top) if top else None, 'bottom': Path(bottom) if bottom else None } source = unpack_if_necessary(source, tmpdir) matches = match_gerbers_in_dir(source) for side in ('top', 'bottom'): if not outfiles[side]: continue if not matches[side]: warnings.warn(f'No input gerber files found for {side} side') continue try: units, layers = load_side(matches[side]) except SystemError as e: raise click.UsageError(e.args) # cairo-svg uses a hardcoded dpi value of 72. pcb-tools does something weird, so we have to scale things # here. scale = 1/25.4 if units == 'metric' else 1.0 # pcb-tools gerber scale scale *= CAIRO_SVG_HARDCODED_DPI if not vector: # adapt scale for png export scale *= raster_dpi / CAIRO_SVG_HARDCODED_DPI bounds = get_bounds(bbox, layers) ctx = GerberCairoContext(scale=scale) for layer_name in LAYER_RENDER_ORDER: for _path, to_render in layers.get(layer_name, ()): ctx.render_layer(to_render, bounds=bounds) filetype = 'svg' if vector else 'png' tmp_render = tmpdir / f'intermediate-{side}.{filetype}' ctx.dump(str(tmp_render)) if vector: with open(tmp_render, 'rb') as f: svg_data = f.read() with open(outfiles[side], 'wb') as f: f.write(create_template_from_svg(bounds, svg_data)) else: # raster with open(tmp_render, 'rb') as f: png_data = f.read() with open(outfiles[side], 'w') as f: f.write(template_svg_for_png(bounds, png_data)) # Subtraction script handling #============================ DEFAULT_SUB_SCRIPT = ''' out.silk -= in.mask ''' def parse_subtract_script(script, default_dilation=0.1): if script is None: script = DEFAULT_SUB_SCRIPT subtract_script = {} lines = script.replace(';', '\n').splitlines() for line in lines: line = line.strip() if not line or line.startswith('#'): continue line = line.lower() line = re.sub('\s', '', line) # out.copper -= in.copper+0.1 varname = r'([a-z]+\.[a-z]+)' floatnum = r'([+-][.0-9]+)' match = re.fullmatch(fr'{varname}-={varname}{floatnum}?', line) if not match: raise ValueError(f'Cannot parse line: {line}') out_var, in_var, dilation = match.groups() if not out_var.startswith('out.') or not in_var.startswith('in.'): raise ValueError('All left-hand side values must be outputs, right-hand side values must be inputs.') _out, _, out_layer = out_var.partition('.') _in, _, in_layer = in_var.partition('.') dilation = float(dilation) if dilation else default_dilation subtract_script[out_layer] = subtract_script.get(out_layer, []) + [(in_layer, dilation)] return subtract_script # Parameter parsing foo #====================== def parse_bbox(bbox): if not bbox: return None elems = [ int(elem) for elem in re.split('[,/ ]', bbox) ] if len(elems) not in (2, 4): raise click.BadParameter( '--bbox must be either two floating-point values like: w,h or four like: x,y,w,h') elems = [ float(e) for e in elems ] if len(elems) == 2: bounds = [0, 0, *elems] else: bounds = elems # now transform bounds to the format pcb-tools uses. Instead of (x, y, w, h) or even (x1, y1, x2, y2), that # is ((x1, x2), (y1, y2) x, y, w, h = bounds return ((x, x+w), (y, y+h)) def bounds_from_outline(layers): ''' NOTE: When the user has not set explicit bounds, we automatically extract the design's bounding box from the input gerber files. If a folder is used as input, we use the outline gerber and barf if we can't find one. If only a single file is given, we simply use that file's bounding box We have to do things this way since gerber files do not have explicit bounds listed. Note that the bounding box extracted from the outline layer usually will be one outline layer stroke widht larger in all directions than the finished board. ''' if 'outline' in layers: outline_files = layers['outline'] _path, grb = outline_files[0] return calculate_apertureless_bounding_box(grb.cam_source) elif len(layers) == 1: first_layer, *rest = layers.values() first_file, *rest = first_layer _path, grb = first_file return grb.cam_source.bounding_box else: raise click.UsageError('Cannot find an outline file and no --bbox given.') def get_bounds(bbox, layers): bounds = parse_bbox(bbox) if bounds: return bounds return bounds_from_outline(layers) # Utility foo # =========== # Gerber file name extensions for Altium/Protel | KiCAD | Eagle # Note that in case of KiCAD these extensions occassionally change without notice. If you discover that this list is not # up to date, please know that it's not my fault and submit an issue or send me an email. LAYER_SPEC = { 'top': { 'paste': '.gtp|-F_Paste.gbr|-F.Paste.gbr|.pmc', 'silk': '.gto|-F_Silkscreen.gbr|-F_SilkS.gbr|-F.SilkS.gbr|.plc', 'mask': '.gts|-F_Mask.gbr|-F.Mask.gbr|.stc', 'copper': '.gtl|-F_Cu.gbr|-F.Cu.gbr|.cmp', 'outline': '.gko|.gm1|-Edge_Cuts.gbr|-Edge.Cuts.gbr|.gmb', 'drill': '.drl|.txt|-npth.drl', }, 'bottom': { 'paste': '.gbp|-B_Paste.gbr|-B.Paste.gbr|.pms', 'silk': '.gbo|-B_Silkscreen.gbr|-B_SilkS.gbr|-B.SilkS.gbr|.pls', 'mask': '.gbs|-B_Mask.gbr|-B.Mask.gbr|.sts', 'copper': '.gbl|-B_Cu.gbr|-B.Cu.gbr|.sol', 'outline': '.gko|.gm1|-Edge_Cuts.gbr|-Edge.Cuts.gbr|.gmb', 'drill': '.drl|.txt|-npth.drl', }, } # Maps keys from LAYER_SPEC to pcb-tools layer classes (see pcb-tools'es gerber/layers.py) LAYER_CLASSES = { 'silk': 'topsilk', 'mask': 'topmask', 'paste': 'toppaste', 'copper': 'top', 'outline': 'outline', 'drill': 'drill', } LAYER_RENDER_ORDER = [ 'copper', 'mask', 'silk', 'paste', 'outline', 'drill' ] def match_gerbers_in_dir(path): out = {} for side, layers in LAYER_SPEC.items(): out[side] = {} for layer, match in layers.items(): l = list(find_gerber_in_dir(path, match)) if l: out[side][layer] = l return out def find_gerber_in_dir(path, extensions): exts = extensions.split('|') for entry in path.iterdir(): if not entry.is_file(): continue if any(entry.name.lower().endswith(suffix.lower()) for suffix in exts): yield entry def calculate_apertureless_bounding_box(cam): ''' pcb-tools'es default bounding box function returns the bounding box of the primitives including apertures (i.e. line widths). For determining a board's size from the outline layer, we want the bounding box disregarding apertures. ''' min_x = min_y = 1000000 max_x = max_y = -1000000 for prim in cam.primitives: bounds = prim.bounding_box_no_aperture min_x = min(bounds[0][0], min_x) max_x = max(bounds[0][1], max_x) min_y = min(bounds[1][0], min_y) max_y = max(bounds[1][1], max_y) return ((min_x, max_x), (min_y, max_y)) def unpack_if_necessary(source, tmpdir, dirname='input'): """ Handle command-line input paths. If path points to a directory, return unchanged. If path points to a zip file, unpack to a directory inside tmpdir and return that. If path points to a file that is not a zip, copy that file into a subdir of tmpdir and return that subdir. """ # If source is not a directory with gerber files (-> zip/single gerber), make it one if not source.is_dir(): tmp_indir = tmpdir / dirname tmp_indir.mkdir() if source.suffix.lower() == '.zip' or is_zipfile(source): with ZipFile(source) as f: f.extractall(path=tmp_indir) else: # single input file shutil.copy(source, tmp_indir) return tmp_indir else: return source def load_side(side_matches): """ Load all gerber files for one side returned by match_gerbers_in_dir. """ def load(layer, path): print('loading', layer, 'layer from:', path) grb = gerber.load_layer(str(path)) grb.layer_class = LAYER_CLASSES.get(layer, 'unknown') return grb layers = { layer: [ (path, load(layer, path)) for path in files ] for layer, files in side_matches.items() } for layer, elems in layers.items(): if len(elems) > 1 and layer != 'drill': raise SystemError(f'Multiple files found for layer {layer}: {", ".join(side_matches[layer]) }') unitses = set(layer.cam_source.units for items in layers.values() for _path, layer in items) if len(unitses) != 1: # FIXME: we should ideally be able to deal with this. We'll have to figure out a way to update a # GerberCairoContext's scale in between layers. raise SystemError('Input gerber files mix metric and imperial units. Please fix your export.') units, = unitses return units, layers # SVG export #=========== DEFAULT_EXTRA_LAYERS = [ layer for layer in LAYER_RENDER_ORDER if layer != "drill" ] def template_layer(name): return f'' def template_svg_for_png(bounds, png_data, extra_layers=DEFAULT_EXTRA_LAYERS): (x1, x2), (y1, y2) = bounds w_mm, h_mm = (x2 - x1), (y2 - y1) extra_layers = "\n ".join(template_layer(name) for name in extra_layers) # we set up the viewport such that document dimensions = document units = mm template = f''' {extra_layers} ''' return textwrap.dedent(template) # this is fixed, we cannot tell cairo-svg to use some other value. we just have to work around it. CAIRO_SVG_HARDCODED_DPI = 72.0 MM_PER_INCH = 25.4 def svg_pt_to_mm(pt_len, dpi=CAIRO_SVG_HARDCODED_DPI): if pt_len.endswith('pt'): pt_len = pt_len[:-2] return f'{float(pt_len) / dpi * MM_PER_INCH}mm' def create_template_from_svg(bounds, svg_data, extra_layers=DEFAULT_EXTRA_LAYERS): svg = etree.fromstring(svg_data) # add inkscape namespaces SVG_NS = '{http://www.w3.org/2000/svg}' INKSCAPE_NS = 'http://www.inkscape.org/namespaces/inkscape' SODIPODI_NS = 'http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd' # glObAL stAtE YaY etree.register_namespace('inkscape', INKSCAPE_NS) etree.register_namespace('sodipodi', SODIPODI_NS) INKSCAPE_NS = '{'+INKSCAPE_NS+'}' SODIPODI_NS = '{'+SODIPODI_NS+'}' # convert document units to mm svg.set('width', svg_pt_to_mm(svg.get('width'))) svg.set('height', svg_pt_to_mm(svg.get('height'))) # make original group an inkscape layer orig_g = svg.find(SVG_NS+'g') orig_g.set('id', 'g-preview') orig_g.set(INKSCAPE_NS+'label', 'Preview') orig_g.set(SODIPODI_NS+'insensitive', 'true') # lock group orig_g.set('style', 'opacity:0.5') # add layers for layer in extra_layers: new_g = etree.SubElement(svg, SVG_NS+'g') new_g.set('id', f'g-{slugify(layer)}') new_g.set(INKSCAPE_NS+'label', layer) new_g.set(INKSCAPE_NS+'groupmode', 'layer') return etree.tostring(svg) # SVG/gerber import #================== def dilate_gerber(layers, layer_name, dilation, bbox, tmpdir, outfile, units): if layer_name not in layers: raise ValueError(f'Cannot dilate layer {layer_name}: layer not found in input dir') bounds = get_bounds(bbox, layers) (x_min_mm, x_max_mm), (y_min_mm, y_max_mm) = bounds origin_x = x_min_mm / MM_PER_INCH origin_y = y_min_mm / MM_PER_INCH width = (x_max_mm - x_min_mm) / MM_PER_INCH height = (y_max_mm - y_min_mm) / MM_PER_INCH tmpfile = tmpdir / 'dilate-tmp.svg' path, _gbr = layers[layer_name][0] # NOTE: gerbv has an undocumented maximum length of 20 chars for the arguments to --origin and --window_inch cmd = ['gerbv', '-x', 'svg', '--border=0', f'--origin={origin_x:.6f}x{origin_y:.6f}', f'--window_inch={width:.6f}x{height:.6f}', '--foreground=#ffffff', '-o', str(tmpfile), str(path)] subprocess.run(cmd, check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) # dilate & render back to gerber # TODO: the scale parameter is a hack. ideally we would fix svg-flatten to handle input units correctly. svg_to_gerber(tmpfile, outfile, dilate=-dilation, dpi=72, scale=25.4/72.0) def svg_to_gerber(infile, outfile, layer=None, trace_space:'mm'=0.1, vectorizer=None, vectorizer_map=None, exclude_groups=None, dilate=None, dpi=None, scale=None): if 'SVG_FLATTEN' in os.environ: candidates = [os.environ['SVG_FLATTEN']] else: # By default, try three options: candidates = [ # somewhere in $PATH 'svg-flatten', # next to our current python interpreter (e.g. in virtualenv str(Path(sys.executable).parent / 'svg-flatten'), # next to this python source file in the development repo str(Path(__file__).parent.parent / 'svg-flatten' / 'build' / 'svg-flatten') ] args = [ '--format', 'gerber', '--precision', '6', # intermediate file, use higher than necessary precision '--trace-space', str(trace_space) ] if layer: args += ['--only-groups', f'g-{slugify(layer)}'] if vectorizer: args += ['--vectorizer', vectorizer] if vectorizer_map: args += ['--vectorizer-map', vectorizer_map] if exclude_groups: args += ['--exclude-groups', exclude_groups] if dilate: args += ['--dilate', str(dilate)] if dpi: args += ['--usvg-dpi', str(dpi)] if scale: args += ['--scale', str(scale)] args += [str(infile), str(outfile)] for candidate in candidates: try: res = subprocess.run([candidate, *args], check=True) break except FileNotFoundError: continue else: raise SystemError('svg-flatten executable not found') if __name__ == '__main__': cli()