diff options
Diffstat (limited to 'lib/pam.h')
| -rw-r--r-- | lib/pam.h | 75 |
1 files changed, 48 insertions, 27 deletions
diff --git a/lib/pam.h b/lib/pam.h index 0055858b..94c85b4e 100644 --- a/lib/pam.h +++ b/lib/pam.h @@ -136,6 +136,18 @@ struct pam { /* The plane number of the opacity plane; meaningless if 'haveOpacity' is false or 'visual' is false. */ + int is_seekable; /* boolean */ + /* The file 'file' is seekable -- you can set the position of next + reading or writing to anything and any time. + + If libnetpbm cannot tell if it is seekable or not, this is false. + */ + pm_filepos raster_pos; + /* The file position of the raster (which is also the end of the + header). + + Meaningless if 'is_seekable' is false. + */ }; #define PAM_HAVE_ALLOCATION_DEPTH 1 @@ -220,33 +232,6 @@ struct pamtuples { }; -typedef float * pnm_transformMap; - /* This is an array of transform maps. transform[N] is the - array that is the map for Plane N. - - Transform maps define a transformation between PAM sample value - to normalized libnetpbm "samplen" value, i.e. what you get back - from pnm_readpamrown() or pass to pnm_writepamrown(). - Typically, it's a gamma transfer function generated by - pnm_creategammatransform() or pnm_createungammatransform(). - - NULL for any transform means just plain normalization -- divide - the PAM sample value by the maxval to get the samplen, multiply - samplen by the maxval and round to get PAM sample value. - - NULL for map table, or 'transform' member not present (pam - structure is too small to contain it) means ALL transforms - are plain normalization. - - Each transform map is an array indexed by a PAM sample - value, containing 'float' values. So it must have 'maxval' - entries. The sample -> samplen tranformation is just the - obvious table lookup. The samplen -> sample transformation is - more complicated -- if the samplen value is between map[N] - and map[N+1], then the sample value is N. And only transforms - where map[N+1] > map[N] are allowed. - */ - /* Declarations of library functions. */ /* We don't have a specific PAM function for init and nextimage, because @@ -320,6 +305,9 @@ pnm_getopacity(const struct pam * const pamP, void pnm_createBlackTuple(const struct pam * const pamP, tuple * const blackTupleP); +void +pnm_createWhiteTuple(const struct pam * const pamP, tuple * const whiteTupleP); + tuple pnm_allocpamtuple(const struct pam * const pamP); @@ -368,6 +356,12 @@ void pnm_writepaminit(struct pam * const pamP); void +pnm_formatpamtuples(const struct pam * const pamP, + const tuple * const tuplerow, + unsigned char * const outbuf, + unsigned int const nTuple, + unsigned int * const rowSizeP); +void pnm_formatpamrow(const struct pam * const pamP, const tuple * const tuplerow, unsigned char * const outbuf, @@ -382,6 +376,14 @@ pnm_writepamrowmult(const struct pam * const pamP, unsigned int const rptcnt); void +pnm_writepamrowpart(const struct pam * const pamP, + const tuple * const tuplerow, + unsigned int const firstRow, + unsigned int const firstCol, + unsigned int const rowCt, + unsigned int const colCt); + +void pnm_writepam(struct pam * const pamP, tuple ** const tuplearray); void @@ -438,6 +440,21 @@ void pnm_writepamn(struct pam * const pamP, tuplen ** const tuplenarray); +typedef samplen * pnm_transformMap; + /* This defines a transformation between PAM sample value + to normalized libnetpbm "samplen" value, i.e. what you get back + from pnm_readpamrown() or pass to pnm_writepamrown(). + Typically, it's a gamma transfer function generated by + pnm_creategammatransform() or pnm_createungammatransform(). + + It is an array indexed by a PAM sample value, containing 'float' + values. So it must have 'maxval' entries. The sample -> samplen + transformation is just the obvious table lookup. The samplen -> sample + transformation is more complicated -- if the samplen value is between + map[N] and map[N+1], then the sample value is N. And only transforms + where map[N+1] > map[N] are allowed. + */ + samplen pnm_normalized_sample(struct pam * const pamP, sample const sample); @@ -576,6 +593,10 @@ tuple pnm_backgroundtuple(struct pam * const pamP, tuple ** const tuples); +tuple +pnm_backgroundtuplerow(const struct pam * const pamP, + tuple * const tuplerow); + /*---------------------------------------------------------------------------- These are meant for passing to pm_system() as Standard Input feeder and Standard Output accepter. |