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app: add gimp_gradient_segment_range_merge()

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... which merges a segment range into a single segment, that spans
the entire range, and has the same endpoint colors.  The merged
segment's midpoint is at its center, and its blend function and
coloring type are those of the range's segments if they're uniform,
or the default ones otherwise.
This commit is contained in:
Ell 2017-07-30 15:11:02 -04:00
parent 082f6a4122
commit d710773aba
2 changed files with 70 additions and 0 deletions
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64
app/core/gimpgradient.c
View file

@ -1791,6 +1791,70 @@ gimp_gradient_segment_range_delete (GimpGradient *gradient,
*final_end_seg = end_seg;
}
void
gimp_gradient_segment_range_merge (GimpGradient *gradient,
GimpGradientSegment *start_seg,
GimpGradientSegment *end_seg,
GimpGradientSegment **final_start_seg,
GimpGradientSegment **final_end_seg)
{
GimpGradientSegment *seg;
g_return_if_fail (GIMP_IS_GRADIENT (gradient));
if (! end_seg)
end_seg = gimp_gradient_segment_get_last (start_seg);
gimp_data_freeze (GIMP_DATA (gradient));
/* Copy the end segment's right position and color to the start segment */
start_seg->right = end_seg->right;
start_seg->right_color_type = end_seg->right_color_type;
start_seg->right_color = end_seg->right_color;
/* Center the start segment's midpoint */
start_seg->middle = (start_seg->left + start_seg->right) / 2.0;
/* Remove range segments past the start segment from the segment list */
start_seg->next = end_seg->next;
if (start_seg->next)
start_seg->next->prev = start_seg;
/* Merge the range's blend function and coloring type, and free the rest of
* the segments.
*/
seg = end_seg;
while (seg != start_seg)
{
GimpGradientSegment *prev = seg->prev;
/* If the blend function and/or coloring type aren't uniform, reset them. */
if (seg->type != start_seg->type)
start_seg->type = GIMP_GRADIENT_SEGMENT_LINEAR;
if (seg->color != start_seg->color)
start_seg->color = GIMP_GRADIENT_SEGMENT_RGB;
gimp_gradient_segment_free (seg);
seg = prev;
}
if (final_start_seg)
*final_start_seg = start_seg;
if (final_end_seg)
*final_end_seg = start_seg;
gimp_data_thaw (GIMP_DATA (gradient));
}
void
gimp_gradient_segment_range_recenter_handles (GimpGradient *gradient,
GimpGradientSegment *start_seg,

6
app/core/gimpgradient.h
View file

@ -265,6 +265,12 @@ void gimp_gradient_segment_range_delete (GimpGradient *gradient,
GimpGradientSegment **final_start_seg,
GimpGradientSegment **final_end_seg);
void gimp_gradient_segment_range_merge (GimpGradient *gradient,
GimpGradientSegment *start_seg,
GimpGradientSegment *end_seg,
GimpGradientSegment **final_start_seg,
GimpGradientSegment **final_end_seg);
void gimp_gradient_segment_range_recenter_handles
(GimpGradient *gradient,
GimpGradientSegment *start_seg,