Roll skia/third_party/skcms e040063..a7e79c5 (2 commits)

https://skia.googlesource.com/skcms.git/+log/e040063..a7e79c5

2018-05-16 mtklein@chromium.org try yet again to fix gauss-newton stepping
2018-05-16 mtklein@chromium.org add clang.O0 build


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CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel
TBR=herb@google.com

Change-Id: I63a0ed3f912f69b114e3100ea44311f478563d3a
Reviewed-on: https://skia-review.googlesource.com/128475
Commit-Queue: skcms-skia-autoroll <skcms-skia-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Reviewed-by: skcms-skia-autoroll <skcms-skia-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/third_party/skcms/src/GaussNewton.c b/third_party/skcms/src/GaussNewton.c
index 7e9f774538..61aeddbcdb 100644
--- a/third_party/skcms/src/GaussNewton.c
+++ b/third_party/skcms/src/GaussNewton.c
@@ -16,7 +16,7 @@
 bool skcms_gauss_newton_step(float (*rg)(float x, const void*, const float P[3], float dfdP[3]),
                              const void* ctx,
                              float P[3],
-                             float x0, float x1, int N) {
+                             float x0, float dx, int N) {
     // We'll sample x from the range [x0,x1] (both inclusive) N times with even spacing.
     //
     // We want to do P' = P + (Jf^T Jf)^-1 Jf^T r(P),
@@ -56,7 +56,6 @@ bool skcms_gauss_newton_step(float (*rg)(float x, const void*, const float P[3],
     // 1,2) evaluate lhs and evaluate rhs
     //   We want to evaluate Jf only once, but both lhs and rhs involve Jf^T,
     //   so we'll have to update lhs and rhs at the same time.
-    float dx = (x1-x0)/(N-1);
     for (int i = 0; i < N; i++) {
         float x = x0 + i*dx;