Use platform's device scale factor for cursor

ash/wm/image_cursors.cc

Index: ash/wm/image_cursors.cc
diff --git a/ash/wm/image_cursors.cc b/ash/wm/image_cursors.cc
index e63bece7ffd9389cba0e9d074d345ea4ae8aaa82..2a41375d19658c8ea9a437a775cf96f8391da808 100644
--- a/ash/wm/image_cursors.cc
+++ b/ash/wm/image_cursors.cc
@@ -6,6 +6,9 @@
 
 #include <float.h>
 
+#include "ash/display/display_info.h"
+#include "ash/display/display_manager.h"
+#include "ash/shell.h"
 #include "base/logging.h"
 #include "base/strings/string16.h"
 #include "ui/base/cursor/cursor.h"
@@ -56,41 +59,54 @@ const int kAnimatedCursorIds[] = {
   ui::kCursorProgress
 };
 
-ImageCursors::ImageCursors() : scale_(1.f), cursor_set_(ui::CURSOR_SET_NORMAL) {
+ImageCursors::ImageCursors() : cursor_set_(ui::CURSOR_SET_NORMAL) {
 }
 
 ImageCursors::~ImageCursors() {
 }
 
-gfx::Display ImageCursors::GetDisplay() const {
+float ImageCursors::GetScale() const {
   if (!cursor_loader_) {
     NOTREACHED();
     // Returning default on release build as it's not serious enough to crash
     // even if this ever happens.
-    return gfx::Display();
+    return 1.0f;
   }
-  return cursor_loader_->display();
+  return cursor_loader_->scale();
+}
+
+gfx::Display::Rotation ImageCursors::GetRotation() const {
+  if (!cursor_loader_) {
+    NOTREACHED();
+    // Returning default on release build as it's not serious enough to crash
+    // even if this ever happens.
+    return gfx::Display::ROTATE_0;
+  }
+  return cursor_loader_->rotation();
 }
 
 bool ImageCursors::SetDisplay(const gfx::Display& display) {
-  float device_scale_factor = display.device_scale_factor();
+  DCHECK(display.is_valid());
+  // Use the platform's device scale factor instead of display's
+  // that might have been adjusted for UI scale.
+  float scale_factor = Shell::GetInstance()->display_manager()->
+      GetDisplayInfo(display.id()).device_scale_factor();
+
   if (!cursor_loader_) {
     cursor_loader_.reset(ui::CursorLoader::Create());
-    cursor_loader_->set_scale(scale_);
-  } else if (cursor_loader_->display().rotation() == display.rotation() &&
-             cursor_loader_->display().device_scale_factor() ==
-             device_scale_factor) {
+  } else if (cursor_loader_->rotation() == display.rotation() &&
+             cursor_loader_->scale() == scale_factor) {
     return false;
   }
 
-  cursor_loader_->set_display(display);
+  cursor_loader_->set_rotation(display.rotation());
+  cursor_loader_->set_scale(scale_factor);
   ReloadCursors();
   return true;
 }
 
 void ImageCursors::ReloadCursors() {
-  const gfx::Display& display = cursor_loader_->display();
-  float device_scale_factor = display.device_scale_factor();
+  float device_scale_factor = cursor_loader_->scale();
 
   cursor_loader_->UnloadAll();
 
@@ -121,20 +137,6 @@ void ImageCursors::ReloadCursors() {
   }
 }
 
-void ImageCursors::SetScale(float scale) {
-  if (scale < FLT_EPSILON) {
-    NOTREACHED() << "Scale must be bigger than 0.";
-    scale = 1.0f;
-  }
-
-  scale_ = scale;
-
-  if (cursor_loader_.get()) {
-    cursor_loader_->set_scale(scale);
-    ReloadCursors();
-  }
-}
-
 void ImageCursors::SetCursorSet(ui::CursorSetType cursor_set) {
   if (cursor_set_ == cursor_set)
     return;