| # Copyright 2013 Google, Inc. All Rights Reserved. |
| # |
| # Google Author(s): Matt Fontaine |
| |
| |
| from fontTools.misc.textTools import bytesjoin |
| from fontTools.misc import sstruct |
| from . import E_B_D_T_ |
| from .BitmapGlyphMetrics import ( |
| BigGlyphMetrics, |
| bigGlyphMetricsFormat, |
| SmallGlyphMetrics, |
| smallGlyphMetricsFormat, |
| ) |
| from .E_B_D_T_ import ( |
| BitmapGlyph, |
| BitmapPlusSmallMetricsMixin, |
| BitmapPlusBigMetricsMixin, |
| ) |
| import struct |
| |
| |
| class table_C_B_D_T_(E_B_D_T_.table_E_B_D_T_): |
| # Change the data locator table being referenced. |
| locatorName = "CBLC" |
| |
| # Modify the format class accessor for color bitmap use. |
| def getImageFormatClass(self, imageFormat): |
| try: |
| return E_B_D_T_.table_E_B_D_T_.getImageFormatClass(self, imageFormat) |
| except KeyError: |
| return cbdt_bitmap_classes[imageFormat] |
| |
| |
| # Helper method for removing export features not supported by color bitmaps. |
| # Write data in the parent class will default to raw if an option is unsupported. |
| def _removeUnsupportedForColor(dataFunctions): |
| dataFunctions = dict(dataFunctions) |
| del dataFunctions["row"] |
| return dataFunctions |
| |
| |
| class ColorBitmapGlyph(BitmapGlyph): |
| fileExtension = ".png" |
| xmlDataFunctions = _removeUnsupportedForColor(BitmapGlyph.xmlDataFunctions) |
| |
| |
| class cbdt_bitmap_format_17(BitmapPlusSmallMetricsMixin, ColorBitmapGlyph): |
| def decompile(self): |
| self.metrics = SmallGlyphMetrics() |
| dummy, data = sstruct.unpack2(smallGlyphMetricsFormat, self.data, self.metrics) |
| (dataLen,) = struct.unpack(">L", data[:4]) |
| data = data[4:] |
| |
| # For the image data cut it to the size specified by dataLen. |
| assert dataLen <= len(data), "Data overun in format 17" |
| self.imageData = data[:dataLen] |
| |
| def compile(self, ttFont): |
| dataList = [] |
| dataList.append(sstruct.pack(smallGlyphMetricsFormat, self.metrics)) |
| dataList.append(struct.pack(">L", len(self.imageData))) |
| dataList.append(self.imageData) |
| return bytesjoin(dataList) |
| |
| |
| class cbdt_bitmap_format_18(BitmapPlusBigMetricsMixin, ColorBitmapGlyph): |
| def decompile(self): |
| self.metrics = BigGlyphMetrics() |
| dummy, data = sstruct.unpack2(bigGlyphMetricsFormat, self.data, self.metrics) |
| (dataLen,) = struct.unpack(">L", data[:4]) |
| data = data[4:] |
| |
| # For the image data cut it to the size specified by dataLen. |
| assert dataLen <= len(data), "Data overun in format 18" |
| self.imageData = data[:dataLen] |
| |
| def compile(self, ttFont): |
| dataList = [] |
| dataList.append(sstruct.pack(bigGlyphMetricsFormat, self.metrics)) |
| dataList.append(struct.pack(">L", len(self.imageData))) |
| dataList.append(self.imageData) |
| return bytesjoin(dataList) |
| |
| |
| class cbdt_bitmap_format_19(ColorBitmapGlyph): |
| def decompile(self): |
| (dataLen,) = struct.unpack(">L", self.data[:4]) |
| data = self.data[4:] |
| |
| assert dataLen <= len(data), "Data overun in format 19" |
| self.imageData = data[:dataLen] |
| |
| def compile(self, ttFont): |
| return struct.pack(">L", len(self.imageData)) + self.imageData |
| |
| |
| # Dict for CBDT extended formats. |
| cbdt_bitmap_classes = { |
| 17: cbdt_bitmap_format_17, |
| 18: cbdt_bitmap_format_18, |
| 19: cbdt_bitmap_format_19, |
| } |