[glyf] Decompile VarComponent
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Behdad Esfahbod
parent
de6eee7373
commit
483013be69
@ -25,6 +25,7 @@ import os
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from fontTools.misc import xmlWriter
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from fontTools.misc import xmlWriter
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from fontTools.misc.filenames import userNameToFileName
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from fontTools.misc.filenames import userNameToFileName
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from fontTools.misc.loggingTools import deprecateFunction
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from fontTools.misc.loggingTools import deprecateFunction
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from enum import IntFlag
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log = logging.getLogger(__name__)
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log = logging.getLogger(__name__)
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@ -620,6 +621,8 @@ SCALED_COMPONENT_OFFSET = 0x0800 # composite designed to have the component off
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UNSCALED_COMPONENT_OFFSET = 0x1000 # composite designed not to have the component offset scaled (designed for MS)
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UNSCALED_COMPONENT_OFFSET = 0x1000 # composite designed not to have the component offset scaled (designed for MS)
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CompositeMaxpValues = namedtuple(
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CompositeMaxpValues = namedtuple(
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"CompositeMaxpValues", ["nPoints", "nContours", "maxComponentDepth"]
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"CompositeMaxpValues", ["nPoints", "nContours", "maxComponentDepth"]
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)
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)
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@ -826,6 +829,13 @@ class Glyph(object):
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len(data),
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len(data),
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)
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)
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def decompileVarComponents(self, data, glyfTable):
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self.components = []
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while data:
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component = GlyphVarComponent()
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data = component.decompile(data, glyfTable)
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self.components.append(component)
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def decompileCoordinates(self, data):
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def decompileCoordinates(self, data):
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endPtsOfContours = array.array("H")
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endPtsOfContours = array.array("H")
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endPtsOfContours.frombytes(data[: 2 * self.numberOfContours])
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endPtsOfContours.frombytes(data[: 2 * self.numberOfContours])
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@ -942,6 +952,12 @@ class Glyph(object):
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data = data + struct.pack(">h", len(instructions)) + instructions
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data = data + struct.pack(">h", len(instructions)) + instructions
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return data
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return data
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def compileVarComponents(self, glyfTable):
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data = b""
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for component in self.components:
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data = data + component.compile(glyfTable)
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return data
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def compileCoordinates(self):
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def compileCoordinates(self):
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assert len(self.coordinates) == len(self.flags)
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assert len(self.coordinates) == len(self.flags)
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data = []
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data = []
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@ -1616,6 +1632,145 @@ class GlyphComponent(object):
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return result if result is NotImplemented else not result
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return result if result is NotImplemented else not result
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class VarComponentFlags (IntFlag):
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USE_MY_METRICS = 0x0001
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AXIS_INDICES_ARE_SHORT = 0x0002
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UNIFORM_SCALE = 0x0004
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HAVE_TRANSLATE_X = 0x0008
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HAVE_TRANSLATE_Y = 0x0010
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HAVE_ROTATION = 0x0020
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HAVE_SCALE_X = 0x0040
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HAVE_SCALE_Y = 0x0080
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HAVE_SKEW_X = 0x0100
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HAVE_SKEW_Y = 0x0200
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HAVE_TCENTER_X = 0x0400
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HAVE_TCENTER_Y = 0x0800
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GID_IS_24 = 0x1000
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AXES_HAVE_VARIATION = 0x2000
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class GlyphVarComponent(object):
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def __init__(self):
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pass
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def decompile(self, data, glyfTable):
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flags = struct.unpack(">H", data[:2])[0]
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self.flags = int(flags)
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data = data[2:]
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numAxes = int(data[0])
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data = data[1:]
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if flags & VarComponentFlags.GID_IS_24:
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glyphID = int(struct.unpack(">L", b'\0'+data[:3])[0])
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data = data[3:]
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else:
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glyphID = int(struct.unpack(">H", data[:2])[0])
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data = data[2:]
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self.glyphName = glyfTable.getGlyphName(int(glyphID))
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if flags & VarComponentFlags.AXIS_INDICES_ARE_SHORT:
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axisIndices = array.array("H", data[:2*numAxes])
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if sys.byteorder != "big":
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arrayIndices.byteswap()
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data = data[2*numAxes:]
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else:
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axisIndices = array.array("B", data[:numAxes])
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data = data[numAxes:]
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assert len(axisIndices) == numAxes
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self.axisIndices = list(axisIndices)
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axisValues = array.array("h", data[:2*numAxes])
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if sys.byteorder != "big":
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axisValues.byteswap()
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data = data[2*numAxes:]
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assert len(axisValues) == numAxes
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self.axisValues = [fl2fi(v, 14) for v in axisValues]
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# TODO make axes a dictionary? Needs fvar
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def read_transform_component(data, flag, bits, default):
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if flags & flag:
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return data[2:], fl2fi(struct.unpack(">h", data[:2])[0], bits)
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else:
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return data, default
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data, self.translateX = read_transform_component(data, VarComponentFlags.HAVE_TRANSLATE_X, 0, 0)
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data, self.translateY = read_transform_component(data, VarComponentFlags.HAVE_TRANSLATE_Y, 0, 0)
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data, self.rotation = read_transform_component(data, VarComponentFlags.HAVE_ROTATION, 12, 0)
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data, self.scaleX = read_transform_component(data, VarComponentFlags.HAVE_SCALE_X, 10, 1)
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data, self.scaleY = read_transform_component(data, VarComponentFlags.HAVE_SCALE_Y, 10, 1)
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data, self.skewX = read_transform_component(data, VarComponentFlags.HAVE_SKEW_X, 12, 0)
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data, self.skewY = read_transform_component(data, VarComponentFlags.HAVE_SKEW_Y, 12, 0)
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data, self.tCenterX = read_transform_component(data, VarComponentFlags.HAVE_TCENTER_X, 0, 0)
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data, self.tCenterY = read_transform_component(data, VarComponentFlags.HAVE_TCENTER_Y, 0, 0)
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return data
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def compile(self, more, haveInstructions, glyfTable):
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data = b""
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# reset all flags we will calculate ourselves
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flags = self.flags & (
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ROUND_XY_TO_GRID
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| USE_MY_METRICS
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| SCALED_COMPONENT_OFFSET
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| UNSCALED_COMPONENT_OFFSET
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| NON_OVERLAPPING
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| OVERLAP_COMPOUND
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)
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if more:
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flags = flags | MORE_COMPONENTS
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if haveInstructions:
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flags = flags | WE_HAVE_INSTRUCTIONS
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if hasattr(self, "firstPt"):
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if (0 <= self.firstPt <= 255) and (0 <= self.secondPt <= 255):
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data = data + struct.pack(">BB", self.firstPt, self.secondPt)
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else:
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data = data + struct.pack(">HH", self.firstPt, self.secondPt)
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flags = flags | ARG_1_AND_2_ARE_WORDS
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else:
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x = otRound(self.x)
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y = otRound(self.y)
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flags = flags | ARGS_ARE_XY_VALUES
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if (-128 <= x <= 127) and (-128 <= y <= 127):
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data = data + struct.pack(">bb", x, y)
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else:
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data = data + struct.pack(">hh", x, y)
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flags = flags | ARG_1_AND_2_ARE_WORDS
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if hasattr(self, "transform"):
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transform = [[fl2fi(x, 14) for x in row] for row in self.transform]
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if transform[0][1] or transform[1][0]:
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flags = flags | WE_HAVE_A_TWO_BY_TWO
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data = data + struct.pack(
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">hhhh",
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transform[0][0],
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transform[0][1],
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transform[1][0],
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transform[1][1],
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)
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elif transform[0][0] != transform[1][1]:
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flags = flags | WE_HAVE_AN_X_AND_Y_SCALE
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data = data + struct.pack(">hh", transform[0][0], transform[1][1])
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else:
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flags = flags | WE_HAVE_A_SCALE
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data = data + struct.pack(">h", transform[0][0])
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glyphID = glyfTable.getGlyphID(self.glyphName)
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return struct.pack(">HH", flags, glyphID) + data
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def __eq__(self, other):
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if type(self) != type(other):
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return NotImplemented
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return self.__dict__ == other.__dict__
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def __ne__(self, other):
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result = self.__eq__(other)
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return result if result is NotImplemented else not result
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class GlyphCoordinates(object):
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class GlyphCoordinates(object):
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"""A list of glyph coordinates.
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"""A list of glyph coordinates.
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