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-rw-r--r--Build/source/libs/potrace/potrace-1.12/src/progress.h79
1 files changed, 79 insertions, 0 deletions
diff --git a/Build/source/libs/potrace/potrace-1.12/src/progress.h b/Build/source/libs/potrace/potrace-1.12/src/progress.h
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+++ b/Build/source/libs/potrace/potrace-1.12/src/progress.h
@@ -0,0 +1,79 @@
+/* Copyright (C) 2001-2015 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 */
+