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[color] Fix HLS to RGB colorspace conversion

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The HLS to RGB conversion in case the S value is zero is:

  R = G = B = luminance

ClutterColor uses a byte (0 to 255) for the R, G and B channels
encoding, while luminance is expressed using a floating point value
in the closed interval [0, 1]; thus the case above becomes:

  R = G = B = (luminance * 255)

The clutter_color_from_hls() code is missing the final step of
de-normalizing the luminance value, and so it breaks the roundtrip
colorspace conversion between RGB and HLS.

Fixes bug:

  http://bugzilla.openedhand.com/show_bug.cgi?id=1695
This commit is contained in:
Emmanuele Bassi 2009-07-27 12:04:40 +01:00
parent db2fda9c43
commit ad7dcc9896
1 changed files with 5 additions and 9 deletions
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10
clutter/clutter-color.c
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@ -244,15 +244,10 @@ clutter_color_from_hls (ClutterColor *color,
hue /= 360.0; hue /= 360.0;
if (luminance == 0)
{
color->red = color->green = color->blue = 0;
return;
}
if (saturation == 0) if (saturation == 0)
{ {
color->red = color->green = color->blue = luminance; color->red = color->green = color->blue = (luminance * 255);
return; return;
} }
@ -271,6 +266,7 @@ clutter_color_from_hls (ClutterColor *color,
{ {
if (tmp3[i] < 0) if (tmp3[i] < 0)
tmp3[i] += 1.0; tmp3[i] += 1.0;
if (tmp3[i] > 1) if (tmp3[i] > 1)
tmp3[i] -= 1.0; tmp3[i] -= 1.0;