[content_handler] Make RuntimeHolder convey its viewport metrics to the direct input instance. (#3367)

content_handler/direct_input.cc

@@ -151,8 +151,10 @@ void DirectInput::PerformRead() {
     pointer_data.kind = blink::PointerData::DeviceKind::kTouch;
     pointer_data.device = touch_identifier;
 
-    pointer_data.physical_x = finger.x / 2.0;
-    pointer_data.physical_y = finger.y / 2.0;
+    pointer_data.physical_x = ((static_cast<float>(finger.x) / ACER12_X_MAX) *
+                               viewport_metrics_.physical_width);
+    pointer_data.physical_y = ((static_cast<float>(finger.y) / ACER12_Y_MAX) *
+                               viewport_metrics_.physical_height);
 
     bool down = !!acer12_finger_id_tswitch(finger.finger_id);
 
@@ -231,4 +233,8 @@ ftl::UniqueFD DirectInput::GetTouchFileDescriptor() {
   return {};
 }
 
+void DirectInput::SetViewportMetrics(blink::ViewportMetrics metrics) {
+  viewport_metrics_ = metrics;
+}
+
 }  // namespace flutter_runner

content_handler/direct_input.h

@@ -10,6 +10,7 @@
 #include <vector>
 
 #include "flutter/lib/ui/window/pointer_data_packet.h"
+#include "flutter/lib/ui/window/viewport_metrics.h"
 #include "lib/fidl/c/waiter/async_waiter.h"
 #include "lib/ftl/files/unique_fd.h"
 #include "lib/ftl/macros.h"
@@ -31,6 +32,8 @@ class DirectInput {
 
   void CancelWaitForReadAvailability();
 
+  void SetViewportMetrics(blink::ViewportMetrics metrics);
+
  private:
   DirectInputCallback callback_;
   bool valid_;
@@ -39,6 +42,7 @@ class DirectInput {
   std::vector<uint8_t> read_buffer_;
   FidlAsyncWaitID last_wait_;
   std::set<int64_t> touch_ids_;
+  blink::ViewportMetrics viewport_metrics_;
 
   static ftl::UniqueFD GetTouchFileDescriptor();
 

content_handler/runtime_holder.cc

@@ -146,6 +146,9 @@ void RuntimeHolder::CreateView(
   runtime_ = blink::RuntimeController::Create(this);
   runtime_->CreateDartController(script_uri);
   runtime_->SetViewportMetrics(viewport_metrics_);
+#if FLUTTER_ENABLE_VULKAN
+  direct_input_->SetViewportMetrics(viewport_metrics_);
+#endif  // FLUTTER_ENABLE_VULKAN
   runtime_->dart_controller()->RunFromSnapshot(snapshot.data(),
                                                snapshot.size());
 }
@@ -341,6 +344,11 @@ void RuntimeHolder::OnInvalidation(mozart::ViewInvalidationPtr invalidation,
     // TODO(abarth): Use view_properties_->display_metrics->device_pixel_ratio
     // once that's reasonable.
     runtime_->SetViewportMetrics(viewport_metrics_);
+#if FLUTTER_ENABLE_VULKAN
+    if (direct_input_) {
+      direct_input_->SetViewportMetrics(viewport_metrics_);
+    }
+#endif  // FLUTTER_ENABLE_VULKAN
   }
 
   // Remember the scene version for rendering.