Use samplingoptions for bitmap shader

Change-Id: I64c67ddcac29b68cdd0d25e4af4153358939b0ee
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/343736
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/samplecode/SampleSlides.cpp b/samplecode/SampleSlides.cpp
index 48979a4..b466c19 100644
--- a/samplecode/SampleSlides.cpp
+++ b/samplecode/SampleSlides.cpp
@@ -245,7 +245,8 @@
 
     decode_file("/skimages/logo.gif", &bm);
     size->set(bm.width(), bm.height());
-    return bm.makeShader();
+    return bm.makeShader(SkSamplingOptions(SkFilterMode::kLinear,
+                                           SkMipmapMode::kNone));
 }
 
 static sk_sp<SkShader> make_shader1(const SkIPoint& size) {
@@ -362,7 +363,6 @@
 
     SkPaint paint;
     paint.setDither(true);
-    paint.setFilterQuality(kLow_SkFilterQuality);
 
     for (size_t i = 0; i < SK_ARRAY_COUNT(fRecs); i++) {
         auto verts = SkVertices::MakeCopy(fRecs[i].fMode, fRecs[i].fCount,