| """ |
| colorLib.builder: Build COLR/CPAL tables from scratch |
| |
| """ |
| import collections |
| import copy |
| import enum |
| from functools import partial |
| from typing import ( |
| Any, |
| Dict, |
| Generator, |
| Iterable, |
| List, |
| Mapping, |
| Optional, |
| Sequence, |
| Tuple, |
| Type, |
| TypeVar, |
| Union, |
| ) |
| from fontTools.misc.fixedTools import fixedToFloat |
| from fontTools.ttLib.tables import C_O_L_R_ |
| from fontTools.ttLib.tables import C_P_A_L_ |
| from fontTools.ttLib.tables import _n_a_m_e |
| from fontTools.ttLib.tables.otBase import BaseTable |
| from fontTools.ttLib.tables import otTables as ot |
| from fontTools.ttLib.tables.otTables import ( |
| ExtendMode, |
| CompositeMode, |
| VariableValue, |
| VariableFloat, |
| VariableInt, |
| ) |
| from .errors import ColorLibError |
| |
| |
| # TODO move type aliases to colorLib.types? |
| T = TypeVar("T") |
| _Kwargs = Mapping[str, Any] |
| _PaintInput = Union[int, _Kwargs, ot.Paint, Tuple[str, "_PaintInput"]] |
| _PaintInputList = Sequence[_PaintInput] |
| _ColorGlyphsDict = Dict[str, Union[_PaintInputList, _PaintInput]] |
| _ColorGlyphsV0Dict = Dict[str, Sequence[Tuple[str, int]]] |
| _Number = Union[int, float] |
| _ScalarInput = Union[_Number, VariableValue, Tuple[_Number, int]] |
| _ColorStopTuple = Tuple[_ScalarInput, int] |
| _ColorStopInput = Union[_ColorStopTuple, _Kwargs, ot.ColorStop] |
| _ColorStopsList = Sequence[_ColorStopInput] |
| _ExtendInput = Union[int, str, ExtendMode] |
| _CompositeInput = Union[int, str, CompositeMode] |
| _ColorLineInput = Union[_Kwargs, ot.ColorLine] |
| _PointTuple = Tuple[_ScalarInput, _ScalarInput] |
| _AffineTuple = Tuple[ |
| _ScalarInput, _ScalarInput, _ScalarInput, _ScalarInput, _ScalarInput, _ScalarInput |
| ] |
| _AffineInput = Union[_AffineTuple, ot.Affine2x3] |
| |
| MAX_PAINT_COLR_LAYER_COUNT = 255 |
| |
| |
| def populateCOLRv0( |
| table: ot.COLR, |
| colorGlyphsV0: _ColorGlyphsV0Dict, |
| glyphMap: Optional[Mapping[str, int]] = None, |
| ): |
| """Build v0 color layers and add to existing COLR table. |
| |
| Args: |
| table: a raw otTables.COLR() object (not ttLib's table_C_O_L_R_). |
| colorGlyphsV0: map of base glyph names to lists of (layer glyph names, |
| color palette index) tuples. |
| glyphMap: a map from glyph names to glyph indices, as returned from |
| TTFont.getReverseGlyphMap(), to optionally sort base records by GID. |
| """ |
| if glyphMap is not None: |
| colorGlyphItems = sorted( |
| colorGlyphsV0.items(), key=lambda item: glyphMap[item[0]] |
| ) |
| else: |
| colorGlyphItems = colorGlyphsV0.items() |
| baseGlyphRecords = [] |
| layerRecords = [] |
| for baseGlyph, layers in colorGlyphItems: |
| baseRec = ot.BaseGlyphRecord() |
| baseRec.BaseGlyph = baseGlyph |
| baseRec.FirstLayerIndex = len(layerRecords) |
| baseRec.NumLayers = len(layers) |
| baseGlyphRecords.append(baseRec) |
| |
| for layerGlyph, paletteIndex in layers: |
| layerRec = ot.LayerRecord() |
| layerRec.LayerGlyph = layerGlyph |
| layerRec.PaletteIndex = paletteIndex |
| layerRecords.append(layerRec) |
| |
| table.BaseGlyphRecordCount = len(baseGlyphRecords) |
| table.BaseGlyphRecordArray = ot.BaseGlyphRecordArray() |
| table.BaseGlyphRecordArray.BaseGlyphRecord = baseGlyphRecords |
| table.LayerRecordArray = ot.LayerRecordArray() |
| table.LayerRecordArray.LayerRecord = layerRecords |
| table.LayerRecordCount = len(layerRecords) |
| |
| |
| def buildCOLR( |
| colorGlyphs: _ColorGlyphsDict, |
| version: Optional[int] = None, |
| glyphMap: Optional[Mapping[str, int]] = None, |
| varStore: Optional[ot.VarStore] = None, |
| ) -> C_O_L_R_.table_C_O_L_R_: |
| """Build COLR table from color layers mapping. |
| |
| Args: |
| colorGlyphs: map of base glyph name to, either list of (layer glyph name, |
| color palette index) tuples for COLRv0; or a single Paint (dict) or |
| list of Paint for COLRv1. |
| version: the version of COLR table. If None, the version is determined |
| by the presence of COLRv1 paints or variation data (varStore), which |
| require version 1; otherwise, if all base glyphs use only simple color |
| layers, version 0 is used. |
| glyphMap: a map from glyph names to glyph indices, as returned from |
| TTFont.getReverseGlyphMap(), to optionally sort base records by GID. |
| varStore: Optional ItemVarationStore for deltas associated with v1 layer. |
| |
| Return: |
| A new COLR table. |
| """ |
| self = C_O_L_R_.table_C_O_L_R_() |
| |
| if varStore is not None and version == 0: |
| raise ValueError("Can't add VarStore to COLRv0") |
| |
| if version in (None, 0) and not varStore: |
| # split color glyphs into v0 and v1 and encode separately |
| colorGlyphsV0, colorGlyphsV1 = _split_color_glyphs_by_version(colorGlyphs) |
| if version == 0 and colorGlyphsV1: |
| raise ValueError("Can't encode COLRv1 glyphs in COLRv0") |
| else: |
| # unless explicitly requested for v1 or have variations, in which case |
| # we encode all color glyph as v1 |
| colorGlyphsV0, colorGlyphsV1 = None, colorGlyphs |
| |
| colr = ot.COLR() |
| |
| if colorGlyphsV0: |
| populateCOLRv0(colr, colorGlyphsV0, glyphMap) |
| else: |
| colr.BaseGlyphRecordCount = colr.LayerRecordCount = 0 |
| colr.BaseGlyphRecordArray = colr.LayerRecordArray = None |
| |
| if colorGlyphsV1: |
| colr.LayerV1List, colr.BaseGlyphV1List = buildColrV1(colorGlyphsV1, glyphMap) |
| |
| if version is None: |
| version = 1 if (varStore or colorGlyphsV1) else 0 |
| elif version not in (0, 1): |
| raise NotImplementedError(version) |
| self.version = colr.Version = version |
| |
| if version == 0: |
| self._fromOTTable(colr) |
| else: |
| colr.VarStore = varStore |
| self.table = colr |
| |
| return self |
| |
| |
| class ColorPaletteType(enum.IntFlag): |
| USABLE_WITH_LIGHT_BACKGROUND = 0x0001 |
| USABLE_WITH_DARK_BACKGROUND = 0x0002 |
| |
| @classmethod |
| def _missing_(cls, value): |
| # enforce reserved bits |
| if isinstance(value, int) and (value < 0 or value & 0xFFFC != 0): |
| raise ValueError(f"{value} is not a valid {cls.__name__}") |
| return super()._missing_(value) |
| |
| |
| # None, 'abc' or {'en': 'abc', 'de': 'xyz'} |
| _OptionalLocalizedString = Union[None, str, Dict[str, str]] |
| |
| |
| def buildPaletteLabels( |
| labels: Iterable[_OptionalLocalizedString], nameTable: _n_a_m_e.table__n_a_m_e |
| ) -> List[Optional[int]]: |
| return [ |
| nameTable.addMultilingualName(l, mac=False) |
| if isinstance(l, dict) |
| else C_P_A_L_.table_C_P_A_L_.NO_NAME_ID |
| if l is None |
| else nameTable.addMultilingualName({"en": l}, mac=False) |
| for l in labels |
| ] |
| |
| |
| def buildCPAL( |
| palettes: Sequence[Sequence[Tuple[float, float, float, float]]], |
| paletteTypes: Optional[Sequence[ColorPaletteType]] = None, |
| paletteLabels: Optional[Sequence[_OptionalLocalizedString]] = None, |
| paletteEntryLabels: Optional[Sequence[_OptionalLocalizedString]] = None, |
| nameTable: Optional[_n_a_m_e.table__n_a_m_e] = None, |
| ) -> C_P_A_L_.table_C_P_A_L_: |
| """Build CPAL table from list of color palettes. |
| |
| Args: |
| palettes: list of lists of colors encoded as tuples of (R, G, B, A) floats |
| in the range [0..1]. |
| paletteTypes: optional list of ColorPaletteType, one for each palette. |
| paletteLabels: optional list of palette labels. Each lable can be either: |
| None (no label), a string (for for default English labels), or a |
| localized string (as a dict keyed with BCP47 language codes). |
| paletteEntryLabels: optional list of palette entry labels, one for each |
| palette entry (see paletteLabels). |
| nameTable: optional name table where to store palette and palette entry |
| labels. Required if either paletteLabels or paletteEntryLabels is set. |
| |
| Return: |
| A new CPAL v0 or v1 table, if custom palette types or labels are specified. |
| """ |
| if len({len(p) for p in palettes}) != 1: |
| raise ColorLibError("color palettes have different lengths") |
| |
| if (paletteLabels or paletteEntryLabels) and not nameTable: |
| raise TypeError( |
| "nameTable is required if palette or palette entries have labels" |
| ) |
| |
| cpal = C_P_A_L_.table_C_P_A_L_() |
| cpal.numPaletteEntries = len(palettes[0]) |
| |
| cpal.palettes = [] |
| for i, palette in enumerate(palettes): |
| colors = [] |
| for j, color in enumerate(palette): |
| if not isinstance(color, tuple) or len(color) != 4: |
| raise ColorLibError( |
| f"In palette[{i}][{j}]: expected (R, G, B, A) tuple, got {color!r}" |
| ) |
| if any(v > 1 or v < 0 for v in color): |
| raise ColorLibError( |
| f"palette[{i}][{j}] has invalid out-of-range [0..1] color: {color!r}" |
| ) |
| # input colors are RGBA, CPAL encodes them as BGRA |
| red, green, blue, alpha = color |
| colors.append( |
| C_P_A_L_.Color(*(round(v * 255) for v in (blue, green, red, alpha))) |
| ) |
| cpal.palettes.append(colors) |
| |
| if any(v is not None for v in (paletteTypes, paletteLabels, paletteEntryLabels)): |
| cpal.version = 1 |
| |
| if paletteTypes is not None: |
| if len(paletteTypes) != len(palettes): |
| raise ColorLibError( |
| f"Expected {len(palettes)} paletteTypes, got {len(paletteTypes)}" |
| ) |
| cpal.paletteTypes = [ColorPaletteType(t).value for t in paletteTypes] |
| else: |
| cpal.paletteTypes = [C_P_A_L_.table_C_P_A_L_.DEFAULT_PALETTE_TYPE] * len( |
| palettes |
| ) |
| |
| if paletteLabels is not None: |
| if len(paletteLabels) != len(palettes): |
| raise ColorLibError( |
| f"Expected {len(palettes)} paletteLabels, got {len(paletteLabels)}" |
| ) |
| cpal.paletteLabels = buildPaletteLabels(paletteLabels, nameTable) |
| else: |
| cpal.paletteLabels = [C_P_A_L_.table_C_P_A_L_.NO_NAME_ID] * len(palettes) |
| |
| if paletteEntryLabels is not None: |
| if len(paletteEntryLabels) != cpal.numPaletteEntries: |
| raise ColorLibError( |
| f"Expected {cpal.numPaletteEntries} paletteEntryLabels, " |
| f"got {len(paletteEntryLabels)}" |
| ) |
| cpal.paletteEntryLabels = buildPaletteLabels(paletteEntryLabels, nameTable) |
| else: |
| cpal.paletteEntryLabels = [ |
| C_P_A_L_.table_C_P_A_L_.NO_NAME_ID |
| ] * cpal.numPaletteEntries |
| else: |
| cpal.version = 0 |
| |
| return cpal |
| |
| |
| # COLR v1 tables |
| # See draft proposal at: https://github.com/googlefonts/colr-gradients-spec |
| |
| _DEFAULT_ALPHA = VariableFloat(1.0) |
| |
| |
| def _split_color_glyphs_by_version( |
| colorGlyphs: _ColorGlyphsDict, |
| ) -> Tuple[_ColorGlyphsV0Dict, _ColorGlyphsDict]: |
| colorGlyphsV0 = {} |
| colorGlyphsV1 = {} |
| for baseGlyph, layers in colorGlyphs.items(): |
| if all(isinstance(l, tuple) and isinstance(l[1], int) for l in layers): |
| colorGlyphsV0[baseGlyph] = layers |
| else: |
| colorGlyphsV1[baseGlyph] = layers |
| |
| # sanity check |
| assert set(colorGlyphs) == (set(colorGlyphsV0) | set(colorGlyphsV1)) |
| |
| return colorGlyphsV0, colorGlyphsV1 |
| |
| |
| def _to_variable_value( |
| value: _ScalarInput, |
| minValue: _Number, |
| maxValue: _Number, |
| cls: Type[VariableValue], |
| ) -> VariableValue: |
| if not isinstance(value, cls): |
| try: |
| it = iter(value) |
| except TypeError: # not iterable |
| value = cls(value) |
| else: |
| value = cls._make(it) |
| if value.value < minValue: |
| raise OverflowError(f"{cls.__name__}: {value.value} < {minValue}") |
| if value.value > maxValue: |
| raise OverflowError(f"{cls.__name__}: {value.value} < {maxValue}") |
| return value |
| |
| |
| _to_variable_f16dot16_float = partial( |
| _to_variable_value, |
| cls=VariableFloat, |
| minValue=-(2 ** 15), |
| maxValue=fixedToFloat(2 ** 31 - 1, 16), |
| ) |
| _to_variable_f2dot14_float = partial( |
| _to_variable_value, |
| cls=VariableFloat, |
| minValue=-2.0, |
| maxValue=fixedToFloat(2 ** 15 - 1, 14), |
| ) |
| _to_variable_int16 = partial( |
| _to_variable_value, |
| cls=VariableInt, |
| minValue=-(2 ** 15), |
| maxValue=2 ** 15 - 1, |
| ) |
| _to_variable_uint16 = partial( |
| _to_variable_value, |
| cls=VariableInt, |
| minValue=0, |
| maxValue=2 ** 16, |
| ) |
| |
| |
| def buildColorIndex( |
| paletteIndex: int, alpha: _ScalarInput = _DEFAULT_ALPHA |
| ) -> ot.ColorIndex: |
| self = ot.ColorIndex() |
| self.PaletteIndex = int(paletteIndex) |
| self.Alpha = _to_variable_f2dot14_float(alpha) |
| return self |
| |
| |
| def buildColorStop( |
| offset: _ScalarInput, |
| paletteIndex: int, |
| alpha: _ScalarInput = _DEFAULT_ALPHA, |
| ) -> ot.ColorStop: |
| self = ot.ColorStop() |
| self.StopOffset = _to_variable_f2dot14_float(offset) |
| self.Color = buildColorIndex(paletteIndex, alpha) |
| return self |
| |
| |
| def _to_enum_value(v: Union[str, int, T], enumClass: Type[T]) -> T: |
| if isinstance(v, enumClass): |
| return v |
| elif isinstance(v, str): |
| try: |
| return getattr(enumClass, v.upper()) |
| except AttributeError: |
| raise ValueError(f"{v!r} is not a valid {enumClass.__name__}") |
| return enumClass(v) |
| |
| |
| def _to_extend_mode(v: _ExtendInput) -> ExtendMode: |
| return _to_enum_value(v, ExtendMode) |
| |
| |
| def _to_composite_mode(v: _CompositeInput) -> CompositeMode: |
| return _to_enum_value(v, CompositeMode) |
| |
| |
| def buildColorLine( |
| stops: _ColorStopsList, extend: _ExtendInput = ExtendMode.PAD |
| ) -> ot.ColorLine: |
| self = ot.ColorLine() |
| self.Extend = _to_extend_mode(extend) |
| self.StopCount = len(stops) |
| self.ColorStop = [ |
| stop |
| if isinstance(stop, ot.ColorStop) |
| else buildColorStop(**stop) |
| if isinstance(stop, collections.abc.Mapping) |
| else buildColorStop(*stop) |
| for stop in stops |
| ] |
| return self |
| |
| |
| def _to_color_line(obj): |
| if isinstance(obj, ot.ColorLine): |
| return obj |
| elif isinstance(obj, collections.abc.Mapping): |
| return buildColorLine(**obj) |
| raise TypeError(obj) |
| |
| |
| def _as_tuple(obj) -> Tuple[Any, ...]: |
| # start simple, who even cares about cyclic graphs or interesting field types |
| def _tuple_safe(value): |
| if isinstance(value, enum.Enum): |
| return value |
| elif hasattr(value, "__dict__"): |
| return tuple((k, _tuple_safe(v)) for k, v in value.__dict__.items()) |
| elif isinstance(value, collections.abc.MutableSequence): |
| return tuple(_tuple_safe(e) for e in value) |
| return value |
| |
| return tuple(_tuple_safe(obj)) |
| |
| |
| def _reuse_ranges(num_layers: int) -> Generator[Tuple[int, int], None, None]: |
| # TODO feels like something itertools might have already |
| for lbound in range(num_layers): |
| # TODO may want a max length to limit scope of search |
| # Reuse of very large #s of layers is relatively unlikely |
| # +2: we want sequences of at least 2 |
| # otData handles single-record duplication |
| for ubound in range(lbound + 2, num_layers + 1): |
| yield (lbound, ubound) |
| |
| |
| class LayerV1ListBuilder: |
| slices: List[ot.Paint] |
| layers: List[ot.Paint] |
| reusePool: Mapping[Tuple[Any, ...], int] |
| |
| def __init__(self): |
| self.slices = [] |
| self.layers = [] |
| self.reusePool = {} |
| |
| def buildPaintSolid( |
| self, paletteIndex: int, alpha: _ScalarInput = _DEFAULT_ALPHA |
| ) -> ot.Paint: |
| ot_paint = ot.Paint() |
| ot_paint.Format = int(ot.Paint.Format.PaintSolid) |
| ot_paint.Color = buildColorIndex(paletteIndex, alpha) |
| return ot_paint |
| |
| def buildPaintLinearGradient( |
| self, |
| colorLine: _ColorLineInput, |
| p0: _PointTuple, |
| p1: _PointTuple, |
| p2: Optional[_PointTuple] = None, |
| ) -> ot.Paint: |
| ot_paint = ot.Paint() |
| ot_paint.Format = int(ot.Paint.Format.PaintLinearGradient) |
| ot_paint.ColorLine = _to_color_line(colorLine) |
| |
| if p2 is None: |
| p2 = copy.copy(p1) |
| for i, (x, y) in enumerate((p0, p1, p2)): |
| setattr(ot_paint, f"x{i}", _to_variable_int16(x)) |
| setattr(ot_paint, f"y{i}", _to_variable_int16(y)) |
| |
| return ot_paint |
| |
| def buildPaintRadialGradient( |
| self, |
| colorLine: _ColorLineInput, |
| c0: _PointTuple, |
| c1: _PointTuple, |
| r0: _ScalarInput, |
| r1: _ScalarInput, |
| ) -> ot.Paint: |
| |
| ot_paint = ot.Paint() |
| ot_paint.Format = int(ot.Paint.Format.PaintRadialGradient) |
| ot_paint.ColorLine = _to_color_line(colorLine) |
| |
| for i, (x, y), r in [(0, c0, r0), (1, c1, r1)]: |
| setattr(ot_paint, f"x{i}", _to_variable_int16(x)) |
| setattr(ot_paint, f"y{i}", _to_variable_int16(y)) |
| setattr(ot_paint, f"r{i}", _to_variable_uint16(r)) |
| |
| return ot_paint |
| |
| def buildPaintGlyph(self, glyph: str, paint: _PaintInput) -> ot.Paint: |
| ot_paint = ot.Paint() |
| ot_paint.Format = int(ot.Paint.Format.PaintGlyph) |
| ot_paint.Glyph = glyph |
| ot_paint.Paint = self.buildPaint(paint) |
| return ot_paint |
| |
| def buildPaintColrGlyph(self, glyph: str) -> ot.Paint: |
| ot_paint = ot.Paint() |
| ot_paint.Format = int(ot.Paint.Format.PaintColrGlyph) |
| ot_paint.Glyph = glyph |
| return ot_paint |
| |
| def buildPaintTransform( |
| self, transform: _AffineInput, paint: _PaintInput |
| ) -> ot.Paint: |
| ot_paint = ot.Paint() |
| ot_paint.Format = int(ot.Paint.Format.PaintTransform) |
| if not isinstance(transform, ot.Affine2x3): |
| transform = buildAffine2x3(transform) |
| ot_paint.Transform = transform |
| ot_paint.Paint = self.buildPaint(paint) |
| return ot_paint |
| |
| def buildPaintComposite( |
| self, |
| mode: _CompositeInput, |
| source: _PaintInput, |
| backdrop: _PaintInput, |
| ): |
| ot_paint = ot.Paint() |
| ot_paint.Format = int(ot.Paint.Format.PaintComposite) |
| ot_paint.SourcePaint = self.buildPaint(source) |
| ot_paint.CompositeMode = _to_composite_mode(mode) |
| ot_paint.BackdropPaint = self.buildPaint(backdrop) |
| return ot_paint |
| |
| def buildColrLayers(self, paints: List[_PaintInput]) -> ot.Paint: |
| ot_paint = ot.Paint() |
| ot_paint.Format = int(ot.Paint.Format.PaintColrLayers) |
| self.slices.append(ot_paint) |
| |
| paints = [self.buildPaint(p) for p in paints] |
| |
| # Look for reuse, with preference to longer sequences |
| found_reuse = True |
| while found_reuse: |
| found_reuse = False |
| |
| ranges = sorted( |
| _reuse_ranges(len(paints)), |
| key=lambda t: (t[1] - t[0], t[1], t[0]), |
| reverse=True, |
| ) |
| for lbound, ubound in ranges: |
| reuse_lbound = self.reusePool.get(_as_tuple(paints[lbound:ubound]), -1) |
| if reuse_lbound == -1: |
| continue |
| new_slice = ot.Paint() |
| new_slice.Format = int(ot.Paint.Format.PaintColrLayers) |
| new_slice.NumLayers = ubound - lbound |
| new_slice.FirstLayerIndex = reuse_lbound |
| paints = paints[:lbound] + [new_slice] + paints[ubound:] |
| found_reuse = True |
| break |
| |
| ot_paint.NumLayers = len(paints) |
| ot_paint.FirstLayerIndex = len(self.layers) |
| self.layers.extend(paints) |
| |
| # Register our parts for reuse |
| for lbound, ubound in _reuse_ranges(len(paints)): |
| self.reusePool[_as_tuple(paints[lbound:ubound])] = ( |
| lbound + ot_paint.FirstLayerIndex |
| ) |
| |
| return ot_paint |
| |
| def buildPaint(self, paint: _PaintInput) -> ot.Paint: |
| if isinstance(paint, ot.Paint): |
| return paint |
| elif isinstance(paint, int): |
| paletteIndex = paint |
| return self.buildPaintSolid(paletteIndex) |
| elif isinstance(paint, tuple): |
| layerGlyph, paint = paint |
| return self.buildPaintGlyph(layerGlyph, paint) |
| elif isinstance(paint, list): |
| # implicit PaintColrLayers for a list of > 1 |
| if len(paint) == 0: |
| raise ValueError("An empty list is hard to paint") |
| elif len(paint) == 1: |
| return self.buildPaint(paint[0]) |
| else: |
| return self.buildColrLayers(paint) |
| elif isinstance(paint, collections.abc.Mapping): |
| kwargs = dict(paint) |
| fmt = kwargs.pop("format") |
| try: |
| return LayerV1ListBuilder._buildFunctions[fmt](self, **kwargs) |
| except KeyError: |
| raise NotImplementedError(fmt) |
| raise TypeError(f"Not sure what to do with {type(paint).__name__}: {paint!r}") |
| |
| def build(self) -> ot.LayerV1List: |
| layers = ot.LayerV1List() |
| layers.LayerCount = len(self.layers) |
| layers.Paint = self.layers |
| return layers |
| |
| |
| LayerV1ListBuilder._buildFunctions = { |
| pf.value: getattr(LayerV1ListBuilder, "build" + pf.name) |
| for pf in ot.Paint.Format |
| if pf != ot.Paint.Format.PaintColrLayers |
| } |
| |
| |
| def buildAffine2x3(transform: _AffineTuple) -> ot.Affine2x3: |
| if len(transform) != 6: |
| raise ValueError(f"Expected 6-tuple of floats, found: {transform!r}") |
| self = ot.Affine2x3() |
| # COLRv1 Affine2x3 uses the same column-major order to serialize a 2D |
| # Affine Transformation as the one used by fontTools.misc.transform. |
| # However, for historical reasons, the labels 'xy' and 'yx' are swapped. |
| # Their fundamental meaning is the same though. |
| # COLRv1 Affine2x3 follows the names found in FreeType and Cairo. |
| # In all case, the second element in the 6-tuple correspond to the |
| # y-part of the x basis vector, and the third to the x-part of the y |
| # basis vector. |
| # See https://github.com/googlefonts/colr-gradients-spec/pull/85 |
| for i, attr in enumerate(("xx", "yx", "xy", "yy", "dx", "dy")): |
| setattr(self, attr, _to_variable_f16dot16_float(transform[i])) |
| return self |
| |
| |
| def buildBaseGlyphV1Record( |
| baseGlyph: str, layerBuilder: LayerV1ListBuilder, paint: _PaintInput |
| ) -> ot.BaseGlyphV1List: |
| self = ot.BaseGlyphV1Record() |
| self.BaseGlyph = baseGlyph |
| self.Paint = layerBuilder.buildPaint(paint) |
| return self |
| |
| |
| def _format_glyph_errors(errors: Mapping[str, Exception]) -> str: |
| lines = [] |
| for baseGlyph, error in sorted(errors.items()): |
| lines.append(f" {baseGlyph} => {type(error).__name__}: {error}") |
| return "\n".join(lines) |
| |
| |
| def buildColrV1( |
| colorGlyphs: _ColorGlyphsDict, |
| glyphMap: Optional[Mapping[str, int]] = None, |
| ) -> Tuple[ot.LayerV1List, ot.BaseGlyphV1List]: |
| if glyphMap is not None: |
| colorGlyphItems = sorted( |
| colorGlyphs.items(), key=lambda item: glyphMap[item[0]] |
| ) |
| else: |
| colorGlyphItems = colorGlyphs.items() |
| |
| errors = {} |
| baseGlyphs = [] |
| layerBuilder = LayerV1ListBuilder() |
| for baseGlyph, paint in colorGlyphItems: |
| try: |
| baseGlyphs.append(buildBaseGlyphV1Record(baseGlyph, layerBuilder, paint)) |
| |
| except (ColorLibError, OverflowError, ValueError, TypeError) as e: |
| errors[baseGlyph] = e |
| |
| if errors: |
| failed_glyphs = _format_glyph_errors(errors) |
| exc = ColorLibError(f"Failed to build BaseGlyphV1List:\n{failed_glyphs}") |
| exc.errors = errors |
| raise exc from next(iter(errors.values())) |
| |
| layers = layerBuilder.build() |
| glyphs = ot.BaseGlyphV1List() |
| glyphs.BaseGlyphCount = len(baseGlyphs) |
| glyphs.BaseGlyphV1Record = baseGlyphs |
| return (layers, glyphs) |
