def _add_glyph(svg: SVG, color_glyph: ColorGlyph, reuse_cache: ReuseCache):
# each glyph gets a group of its very own
svg_g = svg.append_to("/svg:svg", etree.Element("g"))
svg_g.attrib["id"] = f"glyph{color_glyph.glyph_id}"
# https://github.com/googlefonts/nanoemoji/issues/58: group needs transform
svg_g.attrib["transform"] = _svg_matrix(
color_glyph.transform_for_otsvg_space())
# copy the shapes into our svg
for painted_layer in color_glyph.as_painted_layers():
view_box = color_glyph.picosvg.view_box()
if view_box is None:
raise ValueError(f"{color_glyph.filename} must declare view box")
reuse_key = _inter_glyph_reuse_key(view_box, painted_layer)
if reuse_key not in reuse_cache.shapes:
el = to_element(painted_layer.path)
match = regex.match(r"url\(#([^)]+)*\)", el.attrib.get("fill", ""))
if match:
el.attrib[
"fill"] = f"url(#{reuse_cache.old_to_new_id.get(match.group(1), match.group(1))})"
svg_g.append(el)
reuse_cache.shapes[reuse_key] = el
for reuse in painted_layer.reuses:
_ensure_has_id(el)
svg_use = etree.SubElement(svg_g, "use")
svg_use.attrib["href"] = f'#{el.attrib["id"]}'
tx, ty = reuse.gettranslate()
if tx:
svg_use.attrib["x"] = _ntos(tx)
if ty:
svg_use.attrib["y"] = _ntos(ty)
transform = reuse.translate(-tx, -ty)
if transform != Affine2D.identity():
# TODO apply scale and rotation. Just slap a transform on the <use>?
raise NotImplementedError(
"TODO apply scale & rotation to use")
else:
el = reuse_cache.shapes[reuse_key]
_ensure_has_id(el)
svg_use = etree.SubElement(svg_g, "use")
svg_use.attrib["href"] = f'#{el.attrib["id"]}'
def _add_glyph(svg: SVG, color_glyph: ColorGlyph, reuse_cache: ReuseCache):
svg_defs = svg.xpath_one("//svg:defs")
# each glyph gets a group of its very own
svg_g = svg.append_to("/svg:svg", etree.Element("g"))
svg_g.attrib["id"] = f"glyph{color_glyph.glyph_id}"
view_box = color_glyph.svg.view_box()
if view_box is None:
raise ValueError(f"{color_glyph.filename} must declare view box")
# https://github.com/googlefonts/nanoemoji/issues/58: group needs transform
svg_g.attrib["transform"] = _svg_matrix(
color_glyph.transform_for_otsvg_space())
vbox_to_upem = color_glyph.transform_for_font_space()
upem_to_vbox = vbox_to_upem.inverse()
# copy the shapes into our svg
el_by_path = {(): svg_g}
complete_paths = set()
nth_paint_glyph = 0
for root in color_glyph.painted_layers:
for context in root.breadth_first():
if any(c == context.path[:len(c)] for c in complete_paths):
continue
parent_el = svg_g
path = context.path
while path:
if path in el_by_path:
parent_el = el_by_path[path]
break
path = path[:-1]
if isinstance(context.paint, PaintGlyph):
glyph_name = _paint_glyph_name(color_glyph, nth_paint_glyph)
assert (glyph_name in reuse_cache.glyph_elements
), f"Missing entry for {glyph_name}"
reuse_result = reuse_cache.reuse_results.get(glyph_name, None)
if reuse_result:
reused_glyph_name = reuse_result.glyph_name
reused_el = reuse_cache.glyph_elements[reused_glyph_name]
reused_el_tag = etree.QName(reused_el.tag).localname
if reused_el_tag == "use":
# if reused_el is a <use> it means _migrate_to_defs has already
# replaced a parent-less <path> with a <use> pointing to it, and
# has appended the reused path to <defs>. Assert that's the case
assert _use_href(reused_el) == reused_glyph_name
reused_el = svg.xpath_one(
f'//svg:defs/svg:path[@id="{reused_glyph_name}"]',
)
elif reused_el_tag == "path":
# we need to refer to you, it's important you have identity
reused_el.attrib["id"] = reused_glyph_name
else:
raise AssertionError(reused_el_tag)
svg_use = _create_use_element(svg, parent_el, reuse_result)
_apply_paint(
svg_defs,
svg_use,
context.paint.paint, # pytype: disable=attribute-error
upem_to_vbox,
reuse_cache,
)
# In two cases, we need to push the reused element to the outer
# <defs> and replace its first occurence with a <use>:
# 1) If reuse spans multiple glyphs, as Adobe Illustrator
# doesn't support direct references between glyphs:
# https://github.com/googlefonts/nanoemoji/issues/264
# 2) If the reused_el has attributes <use> cannot override
# https://github.com/googlefonts/nanoemoji/issues/337
if color_glyph.glyph_name != _color_glyph_name(
reused_glyph_name) or _attrib_apply_paint_uses(
reused_el):
_migrate_to_defs(svg, reused_el, reuse_cache,
reuse_result)
else:
el = reuse_cache.glyph_elements[glyph_name]
_apply_paint(
svg_defs,
el,
context.paint.paint, # pytype: disable=attribute-error
upem_to_vbox,
reuse_cache,
)
parent_el.append(el) # pytype: disable=attribute-error
# don't update el_by_path because we're declaring this path complete
complete_paths.add(context.path + (context.paint, ))
nth_paint_glyph += 1
elif isinstance(context.paint, PaintColrLayers):
pass
elif isinstance(context.paint, PaintSolid):
_apply_solid_paint(parent_el, context.paint)
elif _is_svg_supported_composite(context.paint):
el = etree.SubElement(parent_el, f"{{{svg_meta.svgns()}}}g")
el_by_path[context.path + (context.paint, )] = el
# TODO: support transform types, either by introducing <g> or by applying context.transform to Paint
else:
raise ValueError(f"What do we do with {context}")
