Use samplingoptions in imageshader

Change-Id: I7d94fe7aed702afd0626a40db201caaf7c2a7764
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/342927
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
diff --git a/tools/viewer/Viewer.cpp b/tools/viewer/Viewer.cpp
index 1fa0626..7598c22 100644
--- a/tools/viewer/Viewer.cpp
+++ b/tools/viewer/Viewer.cpp
@@ -698,10 +698,10 @@
 
     auto gamutImage = GetResourceAsImage("images/gamut.png");
     if (gamutImage) {
-        fImGuiGamutPaint.setShader(gamutImage->makeShader());
+        fImGuiGamutPaint.setShader(gamutImage->makeShader(SkSamplingOptions(SkFilterMode::kLinear,
+                                                                            SkMipmapMode::kNone)));
     }
     fImGuiGamutPaint.setColor(SK_ColorWHITE);
-    fImGuiGamutPaint.setFilterQuality(kLow_SkFilterQuality);
 
     fWindow->attach(backend_type_for_window(fBackendType));
     this->setCurrentSlide(this->startupSlide());