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actually do a binary search, not a linear search starting in the middle.

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2005-03-26  Sven Neumann  <sven@gimp.org>

	* modules/cdisplay_colorblind.c (lut_lookup): actually do a binary
	search, not a linear search starting in the middle.
This commit is contained in:
Sven Neumann
2005-03-26 19:16:36 +00:00
committed by Sven Neumann
parent 93a4639895
commit 0f85f1453b
2 changed files with 15 additions and 5 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2005-03-26 Sven Neumann <sven@gimp.org>
* modules/cdisplay_colorblind.c (lut_lookup): actually do a binary
search, not a linear search starting in the middle.
2005-03-26 Sven Neumann <sven@gimp.org> 2005-03-26 Sven Neumann <sven@gimp.org>
* app/display/gimpdisplayshell-close.c * app/display/gimpdisplayshell-close.c

15
modules/cdisplay_colorblind.c
View File

@ -353,24 +353,29 @@ lut_lookup (gfloat value,
const gfloat *lut) const gfloat *lut)
{ {
guchar offset = 128; guchar offset = 128;
gint step = 64;
while (TRUE) while (step)
{ {
if (lut[offset] < value) if (lut[offset] < value)
{ {
if (offset == 255 || lut[offset + 1] >= value) if (offset == 255 || lut[offset + 1] >= value)
return offset; break;
offset++; offset += step;
} }
else else
{ {
if (offset == 0 || lut[offset - 1] < value) if (offset == 0 || lut[offset - 1] < value)
return offset; break;
offset--; offset -= step;
} }
step /= 2;
} }
return offset;
} }
static void static void