diff options
Diffstat (limited to 'render/thscreen.c')
| -rwxr-xr-x[-rw-r--r--] | render/thscreen.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/render/thscreen.c b/render/thscreen.c index 8523e38..7c115f3 100644..100755 --- a/render/thscreen.c +++ b/render/thscreen.c @@ -130,6 +130,16 @@ void screen_edscreens( for (; ip != ein1; ip += pinc, op += pinc, x += xinc) { double ov[THMXCH2D], tv[THMXCH2D], ev[THMXCH2D]; + /* Limit error propogation if asked */ + if (t->mxerr != 0.0) { + for (j = 0; j < t->np; j++) { + if (t->ebuf[j][x] < -t->mxerr) + t->ebuf[j][x] = -t->mxerr; + else if (t->ebuf[j][x] > t->mxerr) + t->ebuf[j][x] = t->mxerr; + } + } + /* For each plane */ for (j = 0; j < t->np; j++) { tv[j] = t->luts[j][ip[j]] / 65535.0; /* 0.0 - 1.0 value */ @@ -253,7 +263,8 @@ thscreens *new_thscreens( double (**lutfunc)(void *cntx, double in), /* List of callback functions, NULL if none */ int edif, /* nz if using error diffusion */ void (*quant)(void *qcntx, double *out, double *in), /* optional quantization func. for edif */ - void *qcntx + void *qcntx, + double mxerr /* If error diffusion anf != 0, max error to propogate */ ) { thscreens *t; int i, bi = -1; @@ -287,6 +298,7 @@ thscreens *new_thscreens( t->qcntx = qcntx; t->mxwidth = mxwidth; + t->mxerr = mxerr; t->lastyoff = -1; /* Allocate and initialise a next line error buffer. */ |