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Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.0.8/potracelib/progress.h')
-rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-1.0.8/potracelib/progress.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.0.8/potracelib/progress.h b/Build/source/texk/dvisvgm/dvisvgm-1.0.8/potracelib/progress.h new file mode 100644 index 00000000000..220639c6e5c --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.0.8/potracelib/progress.h @@ -0,0 +1,79 @@ +/* Copyright (C) 2001-2010 Peter Selinger. + This file is part of Potrace. It is free software and it is covered + by the GNU General Public License. See the file COPYING for details. */ + +/* operations on potrace_progress_t objects, which are defined in + potracelib.h. Note: the code attempts to minimize runtime overhead + when no progress monitoring was requested. It also tries to + minimize excessive progress calculations beneath the "epsilon" + threshold. */ + +#ifndef PROGRESS_H +#define PROGRESS_H + +/* structure to hold progress bar callback data */ +struct progress_s { + void (*callback)(double progress, void *privdata); /* callback fn */ + void *data; /* callback function's private data */ + double min, max; /* desired range of progress, e.g. 0.0 to 1.0 */ + double epsilon; /* granularity: can skip smaller increments */ + double b; /* upper limit of subrange in superrange units */ + double d_prev; /* previous value of d */ +}; +typedef struct progress_s progress_t; + +/* notify given progress object of current progress. Note that d is + given in the 0.0-1.0 range, which will be scaled and translated to + the progress object's range. */ +static inline void progress_update(double d, progress_t *prog) { + double d_scaled; + + if (prog != NULL && prog->callback != NULL) { + d_scaled = prog->min * (1-d) + prog->max * d; + if (d == 1.0 || d_scaled >= prog->d_prev + prog->epsilon) { + prog->callback(prog->min * (1-d) + prog->max * d, prog->data); + prog->d_prev = d_scaled; + } + } +} + +/* start a subrange of the given progress object. The range is + narrowed to [a..b], relative to 0.0-1.0 coordinates. If new range + is below granularity threshold, disable further subdivisions. */ +static inline void progress_subrange_start(double a, double b, const progress_t *prog, progress_t *sub) { + double min, max; + + if (prog == NULL || prog->callback == NULL) { + sub->callback = NULL; + return; + } + + min = prog->min * (1-a) + prog->max * a; + max = prog->min * (1-b) + prog->max * b; + + if (max - min < prog->epsilon) { + sub->callback = NULL; /* no further progress info in subrange */ + sub->b = b; + return; + } + sub->callback = prog->callback; + sub->data = prog->data; + sub->epsilon = prog->epsilon; + sub->min = min; + sub->max = max; + sub->d_prev = prog->d_prev; + return; +} + +static inline void progress_subrange_end(progress_t *prog, progress_t *sub) { + if (prog != NULL && prog->callback != NULL) { + if (sub->callback == NULL) { + progress_update(sub->b, prog); + } else { + prog->d_prev = sub->d_prev; + } + } +} + +#endif /* PROGRESS_H */ + |