OcrResultGlyph *ocr(OcrReader *rd, OcrCellType, int w, Pixcol cols[]);
/* return value is array terminated by {0,-1,-1}
* array is valid until next call to ocr()
*/
OcrResultGlyph *ocr(OcrReader *rd, OcrCellType, int w, Pixcol cols[]);
/* return value is array terminated by {0,-1,-1}
* array is valid until next call to ocr()
*/