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arc: Clamp to 65536 full circles

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To limit the amount of memory used for arcs describing a circle
wrapped multiple times we ignore the circles after the 65536th (but
preserve the same start and end angle mod 2pi).
This commit is contained in:
Andrea Canciani 2010-12-09 14:38:40 +01:00
parent 4314a86aa7
commit 1784fd403e
1 changed files with 9 additions and 2 deletions
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11
src/cairo-arc.c
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@ -38,6 +38,8 @@
#include "cairo-arc-private.h" #include "cairo-arc-private.h"
#define MAX_FULL_CIRCLES 65536
/* Spline deviation from the circle in radius would be given by: /* Spline deviation from the circle in radius would be given by:
error = sqrt (x**2 + y**2) - 1 error = sqrt (x**2 + y**2) - 1
@ -184,8 +186,13 @@ _cairo_arc_in_direction (cairo_t *cr,
if (cairo_status (cr)) if (cairo_status (cr))
return; return;
while (angle_max - angle_min > 4 * M_PI) assert (angle_max >= angle_min);
angle_max -= 2 * M_PI;
if (angle_max - angle_min > 2 * M_PI * MAX_FULL_CIRCLES) {
angle_max = fmod (angle_max - angle_min, 2 * M_PI);
angle_min = fmod (angle_min, 2 * M_PI);
angle_max += angle_min + 2 * M_PI * MAX_FULL_CIRCLES;
}
/* Recurse if drawing arc larger than pi */ /* Recurse if drawing arc larger than pi */
if (angle_max - angle_min > M_PI) { if (angle_max - angle_min > M_PI) {