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Remove potential division by 0 in gfxmenu.

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This commit is contained in:
Vladimir Serbinenko 2015-01-21 15:56:53 +01:00
parent 44b38e4988
commit 6866f2ba37
4 changed files with 61 additions and 46 deletions
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88
grub-core/gfxmenu/gui_circular_progress.c
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@ -138,51 +138,53 @@ circprog_paint (void *vself, const grub_video_rect_t *region)
(height - center_height) / 2, 0, 0,
center_width, center_height);
int radius = grub_min (height, width) / 2 - grub_max (tick_height, tick_width) / 2 - 1;
unsigned nticks;
unsigned tick_begin;
unsigned tick_end;
if (self->end <= self->start
|| self->value <= self->start)
nticks = 0;
else
nticks = ((unsigned) (self->num_ticks
* (self->value - self->start)))
/ ((unsigned) (self->end - self->start));
/* Do ticks appear or disappear as the value approached the end? */
if (self->ticks_disappear)
if (self->num_ticks)
{
tick_begin = nticks;
tick_end = self->num_ticks;
int radius = grub_min (height, width) / 2 - grub_max (tick_height, tick_width) / 2 - 1;
unsigned nticks;
unsigned tick_begin;
unsigned tick_end;
if (self->end <= self->start
|| self->value <= self->start)
nticks = 0;
else
nticks = ((unsigned) (self->num_ticks
* (self->value - self->start)))
/ ((unsigned) (self->end - self->start));
/* Do ticks appear or disappear as the value approached the end? */
if (self->ticks_disappear)
{
tick_begin = nticks;
tick_end = self->num_ticks;
}
else
{
tick_begin = 0;
tick_end = nticks;
}
unsigned i;
for (i = tick_begin; i < tick_end; i++)
{
int x;
int y;
int angle;
/* Calculate the location of the tick. */
angle = self->start_angle
+ i * GRUB_TRIG_ANGLE_MAX / self->num_ticks;
x = width / 2 + (grub_cos (angle) * radius / GRUB_TRIG_FRACTION_SCALE);
y = height / 2 + (grub_sin (angle) * radius / GRUB_TRIG_FRACTION_SCALE);
/* Adjust (x,y) so the tick is centered. */
x -= tick_width / 2;
y -= tick_height / 2;
/* Draw the tick. */
grub_video_blit_bitmap (self->tick_bitmap, GRUB_VIDEO_BLIT_BLEND,
x, y, 0, 0, tick_width, tick_height);
}
}
else
{
tick_begin = 0;
tick_end = nticks;
}
unsigned i;
for (i = tick_begin; i < tick_end; i++)
{
int x;
int y;
int angle;
/* Calculate the location of the tick. */
angle = self->start_angle
+ i * GRUB_TRIG_ANGLE_MAX / self->num_ticks;
x = width / 2 + (grub_cos (angle) * radius / GRUB_TRIG_FRACTION_SCALE);
y = height / 2 + (grub_sin (angle) * radius / GRUB_TRIG_FRACTION_SCALE);
/* Adjust (x,y) so the tick is centered. */
x -= tick_width / 2;
y -= tick_height / 2;
/* Draw the tick. */
grub_video_blit_bitmap (self->tick_bitmap, GRUB_VIDEO_BLIT_BLEND,
x, y, 0, 0, tick_width, tick_height);
}
grub_gui_restore_viewport (&vpsave);
}