Makes the browser send pixels to the GPU process where it should

content/browser/renderer_host/dip_util.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/renderer_host/dip_util.h"
+
+#include "content/public/browser/render_widget_host_view.h"
+#include "ui/gfx/monitor.h"
+#include "ui/gfx/point.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/screen.h"
+#include "ui/gfx/size.h"
+
+namespace content {
+
+float GetDIPScaleFactor(const RenderWidgetHostView* view) {
+  if (gfx::Screen::IsDIPEnabled()) {
+    gfx::Monitor monitor = gfx::Screen::GetMonitorNearestWindow(
+        view ? view->GetNativeView() : NULL);
+    return monitor.device_scale_factor();
+  }
+  return 1.0f;
+}
+
+gfx::Point ConvertPointToDIP(const RenderWidgetHostView* view,
+                             const gfx::Point& point_in_pixel) {
+  return point_in_pixel.Scale(1.0f / GetDIPScaleFactor(view));
+}
+
+gfx::Size ConvertSizeToDIP(const RenderWidgetHostView* view,
+                           const gfx::Size& size_in_pixel) {
+  return size_in_pixel.Scale(1.0f / GetDIPScaleFactor(view));
+}
+
+gfx::Rect ConvertRectToDIP(const RenderWidgetHostView* view,
+                           const gfx::Rect& rect_in_pixel) {
+  float scale = 1.0f / GetDIPScaleFactor(view);
+  return gfx::Rect(rect_in_pixel.origin().Scale(scale),
+                   rect_in_pixel.size().Scale(scale));
+}
+
+gfx::Point ConvertPointToPixel(const RenderWidgetHostView* view,
+                               const gfx::Point& point_in_dip) {
+  return point_in_dip.Scale(GetDIPScaleFactor(view));
+}
+
+gfx::Size ConvertSizeToPixel(const RenderWidgetHostView* view,
+                             const gfx::Size& size_in_dip) {
+  return size_in_dip.Scale(GetDIPScaleFactor(view));
+}
+
+gfx::Rect ConvertRectToPixel(const RenderWidgetHostView* view,
+                             const gfx::Rect& rect_in_dip) {
+    float scale = GetDIPScaleFactor(view);
+    return gfx::Rect(rect_in_dip.origin().Scale(scale),
+                     rect_in_dip.size().Scale(scale));
+}
+
+}  // namespace content