[Impeller] Don't mip filter TextureFilterInput snapshots when there's no mipmap (#40425)

[Impeller] Don't mip filter TextureFilterInput snapshots when there's no mipmap

impeller/entity/contents/filters/inputs/texture_filter_input.cc

diff --git a/impeller/entity/contents/filters/inputs/texture_filter_input.cc b/impeller/entity/contents/filters/inputs/texture_filter_input.cc
index 09a393b..b64a78a 100644
--- a/impeller/entity/contents/filters/inputs/texture_filter_input.cc
+++ b/impeller/entity/contents/filters/inputs/texture_filter_input.cc
@@ -6,6 +6,8 @@
 
 #include <utility>
 
+#include "impeller/renderer/formats.h"
+
 namespace impeller {
 
 TextureFilterInput::TextureFilterInput(std::shared_ptr<Texture> texture,
@@ -21,7 +23,13 @@
 std::optional<Snapshot> TextureFilterInput::GetSnapshot(
     const ContentContext& renderer,
     const Entity& entity) const {
-  return Snapshot{.texture = texture_, .transform = GetTransform(entity)};
+  auto snapshot =
+      Snapshot{.texture = texture_, .transform = GetTransform(entity)};
+  if (texture_->GetMipCount() > 1) {
+    snapshot.sampler_descriptor.label = "TextureFilterInput Trilinear Sampler";
+    snapshot.sampler_descriptor.mip_filter = MipFilter::kLinear;
+  }
+  return snapshot;
 }
 
 std::optional<Rect> TextureFilterInput::GetCoverage(

impeller/renderer/snapshot.h

diff --git a/impeller/renderer/snapshot.h b/impeller/renderer/snapshot.h
index 41ad407..4820447 100644
--- a/impeller/renderer/snapshot.h
+++ b/impeller/renderer/snapshot.h
@@ -30,7 +30,7 @@
       SamplerDescriptor("Default Snapshot Sampler",
                         MinMagFilter::kLinear,
                         MinMagFilter::kLinear,
-                        MipFilter::kLinear);
+                        MipFilter::kNone);
 
   Scalar opacity = 1.0f;