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OBD:TSFT: Difference between revisions
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*PC and Mac TSFTs use a whole byte for every pixel, i.e. 256 shades of gray, which in theory allows for subtle antialiasing. (In practice the antialiasing of Oni's fonts is anything but subtle, and the engine further posterizes them from 8-bit to 4-bit when rendering text.) PS2 fonts use only 2 bits per pixel, i.e., only 4 degrees of brightness/opacity. | *PC and Mac TSFTs use a whole byte for every pixel, i.e. 256 shades of gray, which in theory allows for subtle antialiasing. (In practice the antialiasing of Oni's fonts is anything but subtle, and the engine further posterizes them from 8-bit to 4-bit when rendering text.) PS2 fonts use only 2 bits per pixel, i.e., only 4 degrees of brightness/opacity. | ||
*PC and Mac use a "black-on-white" representation of the font, with blank areas stored as 0xFF and fully opaque pixels as 0x00. PS2 uses "white-on-black", so a single opaque pixels in a row of four will be stored as 0x03, 0x0C, 0x30 or 0xC0. | *PC and Mac use a "black-on-white" representation of the font, with blank areas stored as 0xFF and fully opaque pixels as 0x00. PS2 uses "white-on-black", so a single opaque pixels in a row of four will be stored as 0x03, 0x0C, 0x30 or 0xC0. | ||
*On PC and Mac, the pixel rows for a given glyph can span across several 4-byte array elements, but pixel data for a new glyph must always start at the first byte of an array element (glyph data in a PC or Mac TSGA is indexed by TSFT array element, not by pixel). Therefore, on PC or Mac, if a glyph | *On PC and Mac, the pixel rows for a given glyph can span across several 4-byte array elements, but pixel data for a new glyph must always start at the first byte of an array element (glyph data in a PC or Mac TSGA is indexed by TSFT array element, not by pixel). Therefore, on PC or Mac, if a glyph has, say, 33 8-bit pixels, then there will be 33 bytes of actual storage, spanning 4 whole array elements and 1 byte of a 5th element, and the rest of the 5th element (3 bytes) will be padded (typically with "DE AD" bytes). Inside the PS2 .raw file, the storage not padded or aligned in any way, and the PS2 TSGA are indexing that data by pixel, i.e. by quarter-of-a-byte. | ||
*Same as on PC and Mac, pixel rows are stored top-to-bottom, and each row is stored left-to-right, using lower bits first. For example, the 4x11 bitmap for a 7pt regular double-quote character ("), would be encoded as the following 11 bytes if it was byte-aligned: | *Same as on PC and Mac, pixel rows are stored top-to-bottom, and each row is stored left-to-right, using lower bits first. For example, the 4x11 bitmap for a 7pt regular double-quote character ("), would be encoded as the following 11 bytes if it was byte-aligned: | ||
byte 0x00 (00000000 low-to-high) | byte 0x00 (00000000 low-to-high) | ||