| 145 | |
| 146 | |
| 147 | class Strike(object): |
| 148 | def __init__(self, rawdata=None, ppem=0, resolution=72): |
| 149 | self.data = rawdata |
| 150 | self.ppem = ppem |
| 151 | self.resolution = resolution |
| 152 | self.glyphs = {} |
| 153 | |
| 154 | def decompile(self, ttFont): |
| 155 | if self.data is None: |
| 156 | from fontTools import ttLib |
| 157 | raise ttLib.TTLibError |
| 158 | if len(self.data) < meshStrikeHeaderFormatSize: |
| 159 | from fontTools import ttLib |
| 160 | raise(ttLib.TTLibError, "Strike header too short: Expected %x, got %x.") \ |
| 161 | % (meshStrikeHeaderFormatSize, len(self.data)) |
| 162 | |
| 163 | # read Strike header from raw data |
| 164 | sstruct.unpack(meshStrikeHeaderFormat, self.data[:meshStrikeHeaderFormatSize], self) |
| 165 | |
| 166 | # calculate number of glyphs |
| 167 | firstGlyphDataOffset, = struct.unpack(">L", \ |
| 168 | self.data[meshStrikeHeaderFormatSize:meshStrikeHeaderFormatSize + meshGlyphDataOffsetFormatSize]) |
| 169 | self.numGlyphs = (firstGlyphDataOffset - meshStrikeHeaderFormatSize) // meshGlyphDataOffsetFormatSize - 1 |
| 170 | # ^ -1 because there's one more offset than glyphs |
| 171 | |
| 172 | # build offset list for single glyph data offsets |
| 173 | self.glyphDataOffsets = [] |
| 174 | for i in range(self.numGlyphs + 1): # + 1 because there's one more offset than glyphs |
| 175 | start = i * meshGlyphDataOffsetFormatSize + meshStrikeHeaderFormatSize |
| 176 | current_offset, = struct.unpack(">L", self.data[start:start + meshGlyphDataOffsetFormatSize]) |
| 177 | self.glyphDataOffsets.append(current_offset) |
| 178 | |
| 179 | # iterate through offset list and slice raw data into glyph data records |
| 180 | for i in range(self.numGlyphs): |
| 181 | current_glyph = Glyph(rawdata=self.data[self.glyphDataOffsets[i]:self.glyphDataOffsets[i+1]], gid=i) |
| 182 | current_glyph.decompile(ttFont) |
| 183 | self.glyphs[current_glyph.glyphName] = current_glyph |
| 184 | del self.glyphDataOffsets |
| 185 | del self.numGlyphs |
| 186 | del self.data |
| 187 | |
| 188 | def compile(self, ttFont): |
| 189 | self.glyphDataOffsets = b"" |
| 190 | self.bitmapData = b"" |
| 191 | |
| 192 | glyphOrder = ttFont.getGlyphOrder() |
| 193 | |
| 194 | # first glyph starts right after the header |
| 195 | currentGlyphDataOffset = meshStrikeHeaderFormatSize + meshGlyphDataOffsetFormatSize * (len(glyphOrder) + 1) |
| 196 | for glyphName in glyphOrder: |
| 197 | if glyphName in self.glyphs: |
| 198 | # we have glyph data for this glyph |
| 199 | current_glyph = self.glyphs[glyphName] |
| 200 | else: |
| 201 | # must add empty glyph data record for this glyph |
| 202 | current_glyph = Glyph(glyphName=glyphName) |
| 203 | current_glyph.compile(ttFont) |
| 204 | current_glyph.glyphDataOffset = currentGlyphDataOffset |