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authorTavian Barnes <tavianator@gmail.com>2010-01-14 23:13:53 -0500
committerTavian Barnes <tavianator@gmail.com>2010-01-14 23:13:53 -0500
commit26e8ad8ce8f15e25b856c5cbd7f526d090cda3ae (patch)
tree036b89a439760910cec6e5f7450bb4bd82d99091
parentc662f1b43f04744ac50ffc9f6a08b3b64290b084 (diff)
downloaddimension-26e8ad8ce8f15e25b856c5cbd7f526d090cda3ae.tar.xz
Don't convert to Lab on every dmnsn_add_color().
-rw-r--r--libdimension/color.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/libdimension/color.c b/libdimension/color.c
index abda9bb..6555578 100644
--- a/libdimension/color.c
+++ b/libdimension/color.c
@@ -298,6 +298,14 @@ dmnsn_sRGB_from_color(dmnsn_color color)
return sRGB;
}
+static double
+dmnsn_color_intensity(dmnsn_color color)
+{
+ dmnsn_sRGB sRGB = dmnsn_sRGB_from_color(color);
+ return 0.2126198631048975*sRGB.R + 0.7151387878413206*sRGB.G
+ + 0.0721499433963131*sRGB.B;
+}
+
/* Add two colors */
dmnsn_color
dmnsn_color_add(dmnsn_color c1, dmnsn_color c2)
@@ -314,10 +322,8 @@ dmnsn_color_add(dmnsn_color c1, dmnsn_color c2)
dmnsn_color ret = dmnsn_color_from_sRGB(sRGB);
/* Weighted average of transparencies by intensity */
- dmnsn_CIE_Lab Lab1 = dmnsn_Lab_from_color(c1, dmnsn_whitepoint);
- dmnsn_CIE_Lab Lab2 = dmnsn_Lab_from_color(c2, dmnsn_whitepoint);
- double L1 = Lab1.L*(1.0 - c1.filter - c1.trans);
- double L2 = Lab2.L*(1.0 - c2.filter - c2.trans);
+ double L1 = dmnsn_color_intensity(c1)*(1.0 - c1.filter - c1.trans);
+ double L2 = dmnsn_color_intensity(c2)*(1.0 - c2.filter - c2.trans);
if (L1 + L2) {
ret.filter = (L1*c1.filter + L2*c2.filter)/(L1 + L2);
ret.trans = (L1*c1.trans + L2*c2.trans) /(L1 + L2);