From c0d9c13d0403673a7fe994664a4f616c71301474 Mon Sep 17 00:00:00 2001
From: Carl Worth <cworth@cworth.org>
Date: Thu, 14 Apr 2005 14:02:03 +0000
Subject: [PATCH] Make gradient change color in addition to just changing alpha
 in order to highlight distinction between interpolating in premultiplied vs.
 non-premultiplied space.

---
 ChangeLog                   |   8 ++++++++
 test/gradient-alpha-ref.png | Bin 146 -> 153 bytes
 test/gradient-alpha.c       |   8 ++++----
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 2d27c4dfa..fc599a1aa 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2005-04-14  Carl Worth  <cworth@cworth.org>
+
+	* test/gradient-alpha-ref.png:
+	* test/gradient-alpha.c: (draw): Make gradient change color in
+	addition to just changing alpha in order to highlight distinction
+	between interpolating in premultiplied vs. non-premultiplied
+	space.
+	
 2005-04-14  Carl Worth  <cworth@cworth.org>
 
 	* test/Makefile.am: Improve instructions for when to add a test to
diff --git a/test/gradient-alpha-ref.png b/test/gradient-alpha-ref.png
index fd69649613ac879d6bd9a119bcb41573e92f603e..e75f91105335e2e8fdf4fd4c2e8c96ac71e348e8 100644
GIT binary patch
delta 97
zcmV-n0G|Jn0hs}iKUx$!7DzFt3IG5AJ4r-AR2Y?GtY@g-&p-rV`OLuklPHB>7<hgW
zrSKC253wfl5oh9O23}$n5^42kVm(8&iC-A_i82uY@u(B2K$W+)00000NkvXXu0mjf
D%%UWB

delta 90
zcmV-g0Hyz#0g?fbKT{AKFh}q>P5=M^G)Y83R2Y?GG)|lGpMeO#^8f$;XGAGvU|@Jo
woI*xMYMc0vXgB_+wj2KwX(A)jPohi&06I4lXE&b2&;S4c07*qoM6N<$f*mj-mjD0&

diff --git a/test/gradient-alpha.c b/test/gradient-alpha.c
index 4d97e3ad1..869d23d96 100644
--- a/test/gradient-alpha.c
+++ b/test/gradient-alpha.c
@@ -36,14 +36,14 @@ draw (cairo_t *cr, int width, int height)
 {
     cairo_pattern_t *gradient;
 
-    gradient = cairo_pattern_create_linear (0, 0,
+    gradient = cairo_pattern_create_linear (0, -height,
 					    0, height);
     cairo_pattern_add_color_stop (gradient, 0.0,
-				  .2, .4, .6,
+				  1.0, 0.0, 0.0,
 				  1.0);
     cairo_pattern_add_color_stop (gradient, 1.0,
-				  .2, .4, .6,
-				  0.0);
+				  0.0, 0.0, 1.0,
+				  0.5);
 
     cairo_set_pattern (cr, gradient);