import math from itertools import zip_longest import subprocess import re import bs4 from .utils import tmpfile, print_on_error from .image_support import kicad_fp_export, svg_difference, svg_soup, svg_to_png, run_cargo_cmd from .. import graphic_objects as go from ..utils import MM, arc_bounds, sum_bounds from ..layers import LayerStack from ..cad.kicad.sexp import build_sexp, Atom from ..cad.kicad.sexp_mapper import sexp from ..cad.kicad.footprints import Footprint, FootprintInstance, LAYER_MAP_G2K from ..cad.kicad.layer_colors import KICAD_LAYER_COLORS, KICAD_DRILL_COLORS def test_parse(kicad_mod_file): Footprint.open_mod(kicad_mod_file) def test_round_trip(kicad_mod_file): print('========== Stage 1 load ==========') orig_fp = Footprint.open_mod(kicad_mod_file) print('========== Stage 1 save ==========') stage1_sexp = build_sexp(orig_fp.sexp()) with open('/tmp/foo.sexp', 'w') as f: f.write(stage1_sexp) print('========== Stage 2 load ==========') reparsed_fp = Footprint.parse(stage1_sexp) print('========== Stage 2 save ==========') stage2_sexp = build_sexp(reparsed_fp.sexp()) print('========== Checks ==========') for stage1, stage2 in zip_longest(stage1_sexp.splitlines(), stage2_sexp.splitlines()): assert stage1 == stage2 return original = re.sub(r'\(', '\n(', re.sub(r'\s+', ' ', kicad_mod_file.read_text())) original = re.sub(r'\) \)', '))', original) original = re.sub(r'\) \)', '))', original) original = re.sub(r'\) \)', '))', original) original = re.sub(r'\) \)', '))', original) stage1 = re.sub(r'\(', '\n(', re.sub(r'\s+', ' ', stage1_sexp)) for original, stage1 in zip_longest(original.splitlines(), stage1.splitlines()): if original.startswith('(version'): continue original, stage1 = original.strip(), stage1.strip() if original != stage1: if any(original.startswith(f'({foo}') for foo in ['arc', 'circle', 'rectangle', 'polyline', 'text']): # These files have symbols with graphic primitives in non-standard order return if original.startswith('(symbol') and stage1.startswith('(symbol'): # Re-export can change symbol order. This is ok. return if original.startswith('(at') and stage1.startswith('(at'): # There is some disagreement as to whether rotation angles are ints or floats, and the spec doesn't say. return assert original == stage1 # Regrettably, we have to re-implement a significant part of the SVG spec to fix up the SVGs that kicad-cli produces. def _compute_style(elem): current_style = {} for elem in [*reversed(list(elem.parents)), elem]: attrs = dict(elem.attrs) for match in re.finditer(r'([^:;]+):([^:;]+)', attrs.pop('style', '')): k, v = match.groups() current_style[k.strip().lower()] = v.strip() for k, v in elem.attrs.items(): current_style[k.lower()] = v return current_style def _parse_path_d(path): path_d = path.get('d') if not path_d: return style = _compute_style(path) if style.get('stroke', 'none') != 'none': sr = float(style.get('stroke-width', 0)) / 2 else: sr = 0 if 'C' in path_d: raise ValueError('Path contains cubic beziers') last_x, last_y = None, None # NOTE: kicad-cli exports oddly broken svgs. One of the weirder issues is that in some paths, the "L" command is # simply ommitted. for match in re.finditer(r'([ML]?) ?([0-9.]+) *,? *([0-9.]+)|(A) ?([0-9.]+) *,? *([0-9.]+) *,? *([0-9.]+) *,? * ([01]) *,? *([01]) *,? *([0-9.]+) *,? *([0-9.]+)', path_d): ml, x, y, a, rx, ry, angle, large_arc, sweep, ax, ay = match.groups() if ml or not a: x, y = float(x), float(y) last_x, last_y = x, y yield x-sr, y-sr yield x-sr, y+sr yield x+sr, y-sr yield x+sr, y+sr else: # a rx, ry = float(rx), float(ry) ax, ay = float(ax), float(ay) angle = float(angle) large_arc = bool(int(large_arc)) sweep = bool(int(sweep)) if not math.isclose(rx, ry, abs_tol=1e-6): raise ValueError("Elliptical arcs not supported. How did that end up here? KiCad can't do those either!") mx = (last_x + ax)/2 my = (last_y + ay)/2 dx = ax - last_x dy = ay - last_y l = math.hypot(dx, dy) # clockwise normal nx = -dy/l ny = dx/l arg = rx**2 - (l/2)**2 if arg < 0 or math.isclose(arg, 0, abs_tol=1e-6): cx, cy = mx, my else: nl = math.sqrt(arg) if sweep != large_arc: cx = mx + nx*nl cy = my + ny*nl else: cx = mx - nx*nl cy = my - ny*nl (min_x, min_y), (max_x, max_y) = arc_bounds(last_x, last_y, ax, ay, cx, cy, clockwise=(not sweep)) min_x -= sr min_y -= sr max_x += sr max_y += sr # dbg_i += 1 # with open(f'/tmp/dbg-arc-{dbg_i}.svg', 'w') as f: # vbx, vby = min(last_x, ax), min(last_y, ay) # vbw, vbh = max(last_x, ax), max(last_y, ay) # vbw -= vbx # vbh -= vby # k = 2 # vbx -= vbw*k # vby -= vbh*k # vbw *= 2*k+1 # vbh *= 2*k+1 # sw = min(vbw, vbh)*1e-3 # mr = 3*sw # f.write('\n') # f.write('\n') # f.write(f'>\n') # f.write(f'\n') # f.write(f'\n') # f.write(f'\n') # f.write(f'\n') # f.write(f'\n') # f.write(f'\n') # f.write('\n') yield min_x, min_y yield min_x, max_y yield max_x, min_y yield max_x, max_y last_x, last_y = ax, ay def test_render(kicad_mod_file, tmpfile, print_on_error): # These files have a large, mask-only pad that has a large solder mask margin set. Kicad doesn't render the margin # at all, which I think it should. We render things exactly as I'd expect. if kicad_mod_file.name in ['Fiducial_classic_big_CopperBottom_Type2.kicad_mod', 'Fiducial_classic_big_CopperTop_Type2.kicad_mod', 'Fiducial_classic_big_SilkscreenTop_Type2.kicad_mod']: return # Hide text and remove text from KiCad's renders. Our text rendering is alright, but KiCad has some weird issue # where it seems to mis-calculate the bounding box of stroke font text, leading to a wonky viewport not matching the # actual content, and text that is slightly off from where it should be. The difference is only a few hundred # micrometers, but it's enough to really throw off our error calculation, so we just ignore text. fp = FootprintInstance(0, 0, sexp=Footprint.open_mod(kicad_mod_file), hide_text=True) stack = LayerStack(courtyard=True, fabrication=True, adhesive=True) stack.add_layer('mechanical drawings') stack.add_layer('mechanical comments') fp.render(stack) color_map = {f'{side} {use}': KICAD_LAYER_COLORS[kicad_id] for (side, use), kicad_id in LAYER_MAP_G2K.items()} color_map['drill pth'] = (255, 255, 255, 1) color_map['drill npth'] = (255, 255, 255, 1) # Remove alpha since overlaid shapes won't work correctly with non-1 alpha without complicated svg filter hacks color_map = {key: (f'#{r:02x}{g:02x}{b:02x}', '1') for key, (r, g, b, _a) in color_map.items()} margin = 10 # mm layer = stack[('top', 'courtyard')] bounds = [] #print('===== BOUNDS =====') for obj in layer.objects: if isinstance(obj, (go.Line, go.Arc)): bbox = (min_x, min_y), (max_x, max_y) = obj.bounding_box(unit=MM) #import textwrap #print(f'{min_x: 3.6f} {min_y: 3.6f} {max_x: 3.6f} {max_y: 3.6f}', '\n'.join(textwrap.wrap(str(obj), width=80, subsequent_indent=' '*(3+4*(3+1+6))))) bounds.append(bbox) #print('===== END =====') if not bounds: print('Footprint has no paths on courtyard layer') return bounds = sum_bounds(bounds) (min_x, min_y), (max_x, max_y) = bounds w, h = max_x-min_x, max_y-min_y print_on_error('Gerbonara bounds:', bounds, f'w={w:.6f}', f'h={h:.6f}') out_svg = tmpfile('Output', '.svg') out_svg.write_text(str(stack.to_svg(colors=color_map, force_bounds=bounds, margin=margin))) print_on_error('Input footprint:', kicad_mod_file) ref_svg = tmpfile('Reference render', '.svg') kicad_fp_export(kicad_mod_file, ref_svg) # KiCad's bounding box calculation for SVG output looks broken, and the resulting files have viewports that are too # large. We align our output and KiCad's output using the footprint's courtyard layer. points = [] with svg_soup(ref_svg) as soup: for group in soup.find_all('g'): style = group.get('style', '').lower().replace(' ', '') if 'fill:#ff26e2' not in style or 'stroke:#ff26e2' not in style: continue # This group contains courtyard layer items. for path in group.find_all('path'): points += _parse_path_d(path) if not points: print('Footprint has no paths on courtyard layer') return min_x = min(x for x, y in points) min_y = min(y for x, y in points) max_x = max(x for x, y in points) max_y = max(y for x, y in points) print_on_error('KiCad bounds:', ((min_x, min_y), (max_x, max_y)), f'w={max_x-min_x:.6f}', f'h={max_y-min_y:.6f}') min_x -= margin min_y -= margin max_x += margin max_y += margin w, h = max_x-min_x, max_y-min_y root = soup.find('svg') root_w = root['width'] = f'{w:.6f}mm' root_h = root['height'] = f'{h:.6f}mm' root['viewBox'] = f'{min_x:.6f} {min_y:.6f} {w:.6f} {h:.6f}' # nuke text since kicad-cli's text positioning looks sligthly wonky and we failed to replicate that wonkyness # exactly. for elem in soup.find_all('g', attrs={'class': 'stroked-text'}): elem.decompose() for elem in soup.find_all('text'): elem.decompose() # Currently, there is a bug in resvg leading to mis-rendering. On the file below from the KiCad standard lib, resvg # renders all round pads in a wrong color (?). Interestingly, passing the file through usvg before rendering fixes # this. # Sample footprint: Connector_PinSocket_2.00mm.pretty/PinSocket_2x11_P2.00mm_Vertical.kicad_mod run_cargo_cmd('usvg', [str(ref_svg), str(ref_svg)]) with svg_soup(ref_svg) as soup: # fix up usvg width/height root = soup.find('svg') root['width'] = root_w root['height'] = root_h # remove alpha to avoid complicated filter hacks for elem in root.descendants: if not isinstance(elem, bs4.Tag): continue if elem.has_attr('opacity'): elem['opacity'] = '1' if elem.has_attr('fill-opacity'): elem['fill-opacity'] = '1' if elem.has_attr('stroke-opacity'): elem['stroke-opacity'] = '1' # kicad-cli incorrectly fills arcs for elem in root.find_all('path'): if ' C ' in elem.get('d', '') and elem.get('stroke', 'none') != 'none': elem['fill'] = 'none' # Move fabrication layers above drills because kicad-cli's svg rendering is wonky. with svg_soup(out_svg) as soup: root = soup.find('svg') root.append(soup.find('g', id='l-bottom-fabrication').extract()) root.append(soup.find('g', id='l-top-fabrication').extract()) svg_to_png(ref_svg, tmpfile('Reference render', '.png'), bg=None, dpi=600) svg_to_png(out_svg, tmpfile('Output render', '.png'), bg=None, dpi=600) mean, _max, hist = svg_difference(ref_svg, out_svg, dpi=600, diff_out=tmpfile('Difference', '.png')) # compensate for circular pads aliasing badly aliasing_artifacts = 1e-4 * len(fp.sexp.pads)/50 assert mean < 1e-3 + aliasing_artifacts assert hist[9] < 100 assert hist[3:].sum() < (1e-3 + 10*aliasing_artifacts)*hist.size