5/18/2023 0 Comments Adjust hhea in glyphs mini![]() That is OK do not reset it.)īit 1 - x position of left most black bit is LSBīit 2 - scaled point size and actual point size will differ (i.e. ![]() (The checksum for the 'head' table will be wrong as a result. To compute: set it to 0, calculate the checksum for the 'head' table and put it in the table directory, sum the entire font as a uint32_t, then store 0xB1B0AFBA - sum. The indexToLocFormat value indicates the type of offset format used in the index to loc ( 'loca') table. In a Roman font where spaces and punctuation are present, the font direction hint should be set to 2. For example Roman letters (left-to-right) and Arabic letters (right-to-left) have directionality. Non-neutral characters are those with inherent directionality. Spaces and punctuation are examples of neutral characters. The values 2 and -2 refer to fonts which contain some neutral glyphs, that is glyphs without a strong directionality.Ī neutral character has no inherent directionality. A value of 0 indicates a mixed directional font a value of one indicates only left to right glyphs, -1 only right to left glyphs. The fontDirectionHint provides information about the way in which the glyphs in this font are likely to be set. This value lowestRecPPEM is the smallest readable size in pixels per em for this font. The number of units per em for the font is set in this table. Together they specify a rectangle that constitute a bounding box for all of the (ungridfitted) glyphs in the font. The values xMin, yMin, xMax and yMax must be computed by looking at the outline data for the glyphs in the font. Setting bit 4 allows fonts to alter device dependent widths. Setting bit 3 causes the use of integer scaling instead of fractional scaling. This means that scaling a 12 point screen font to obtain the equivalent printer font may not produce the identical result as requesting a 12 point printer font. If bit 2 is set to one, instructions may use point size explicitly in place of pixels per em. If bit 1 is set to one, the x-position of the leftmost black bit is assumed to be the left side bearing. If bit 0 is set to one, the baselines for the font is at y= 0 (that is, the x-axis). The flags give global information about the font. It can also be used to distinguish between two similar fonts. The checksum is used to verify the integrity of the data in the font. This includes a specification of the font bounding box, the direction in which the font's glyphs are most likely to be written and other information about the placement of glyphs in the em square. It records such facts as the font version number, the creation and modification dates, revision number and basic typographic data that applies to the font as a whole. The 'head' table contains global information about the font. The 'head' table General table information
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