It is time.

ui/compositor/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 "ui/compositor/dip_util.h"
-
-#include "base/command_line.h"
-#include "cc/layers/layer.h"
-#include "ui/compositor/compositor.h"
-#include "ui/compositor/compositor_switches.h"
-#include "ui/compositor/layer.h"
-#include "ui/gfx/display.h"
-#include "ui/gfx/geometry/safe_integer_conversions.h"
-#include "ui/gfx/point.h"
-#include "ui/gfx/point_conversions.h"
-#include "ui/gfx/rect.h"
-#include "ui/gfx/rect_conversions.h"
-#include "ui/gfx/size.h"
-#include "ui/gfx/size_conversions.h"
-
-#if DCHECK_IS_ON()
-#include "ui/compositor/layer_animator.h"
-#endif
-
-namespace ui {
-
-float GetDeviceScaleFactor(const Layer* layer) {
-  return layer->device_scale_factor();
-}
-
-gfx::Point ConvertPointToDIP(const Layer* layer,
-                             const gfx::Point& point_in_pixel) {
-  return gfx::ToFlooredPoint(
-      gfx::ScalePoint(point_in_pixel, 1.0f / GetDeviceScaleFactor(layer)));
-}
-
-gfx::PointF ConvertPointToDIP(const Layer* layer,
-                              const gfx::PointF& point_in_pixel) {
-  return gfx::ScalePoint(point_in_pixel, 1.0f / GetDeviceScaleFactor(layer));
-}
-
-gfx::Size ConvertSizeToDIP(const Layer* layer,
-                           const gfx::Size& size_in_pixel) {
-  return gfx::ToFlooredSize(
-      gfx::ScaleSize(size_in_pixel, 1.0f / GetDeviceScaleFactor(layer)));
-}
-
-gfx::Rect ConvertRectToDIP(const Layer* layer,
-                           const gfx::Rect& rect_in_pixel) {
-  float scale = 1.0f / GetDeviceScaleFactor(layer);
-  return gfx::ToFlooredRectDeprecated(gfx::ScaleRect(rect_in_pixel, scale));
-}
-
-gfx::Point ConvertPointToPixel(const Layer* layer,
-                               const gfx::Point& point_in_dip) {
-  return gfx::ToFlooredPoint(
-      gfx::ScalePoint(point_in_dip, GetDeviceScaleFactor(layer)));
-}
-
-gfx::Size ConvertSizeToPixel(const Layer* layer,
-                             const gfx::Size& size_in_dip) {
-  return gfx::ToFlooredSize(
-      gfx::ScaleSize(size_in_dip, GetDeviceScaleFactor(layer)));
-}
-
-gfx::Rect ConvertRectToPixel(const Layer* layer,
-                             const gfx::Rect& rect_in_dip) {
-  float scale = GetDeviceScaleFactor(layer);
-  // Use ToEnclosingRect() to ensure we paint all the possible pixels
-  // touched. ToEnclosingRect() floors the origin, and ceils the max
-  // coordinate. To do otherwise (such as flooring the size) potentially
-  // results in rounding down and not drawing all the pixels that are
-  // touched.
-  return gfx::ToEnclosingRect(
-      gfx::RectF(gfx::ScalePoint(rect_in_dip.origin(), scale),
-                 gfx::ScaleSize(rect_in_dip.size(), scale)));
-}
-
-#if DCHECK_IS_ON()
-namespace {
-
-void CheckSnapped(float snapped_position) {
-  const float kEplison = 0.0001f;
-  float diff = std::abs(snapped_position - gfx::ToRoundedInt(snapped_position));
-  DCHECK_LT(diff, kEplison);
-}
-
-}  // namespace
-#endif
-
-void SnapLayerToPhysicalPixelBoundary(ui::Layer* snapped_layer,
-                                      ui::Layer* layer_to_snap) {
-  DCHECK_NE(snapped_layer, layer_to_snap);
-  DCHECK(snapped_layer);
-  DCHECK(snapped_layer->Contains(layer_to_snap));
-
-  gfx::Point view_offset_dips = layer_to_snap->GetTargetBounds().origin();
-  ui::Layer::ConvertPointToLayer(
-      layer_to_snap->parent(), snapped_layer, &view_offset_dips);
-  gfx::PointF view_offset = view_offset_dips;
-
-  float scale_factor = GetDeviceScaleFactor(layer_to_snap);
-  view_offset.Scale(scale_factor);
-  gfx::PointF view_offset_snapped(gfx::ToRoundedInt(view_offset.x()),
-                                  gfx::ToRoundedInt(view_offset.y()));
-
-  gfx::Vector2dF fudge = view_offset_snapped - view_offset;
-  fudge.Scale(1.0 / scale_factor);
-  layer_to_snap->SetSubpixelPositionOffset(fudge);
-#if DCHECK_IS_ON()
-  gfx::Point layer_offset;
-  gfx::PointF origin;
-  Layer::ConvertPointToLayer(
-      layer_to_snap->parent(), snapped_layer, &layer_offset);
-  if (layer_to_snap->GetAnimator()->is_animating()) {
-    origin = layer_to_snap->GetTargetBounds().origin() +
-             layer_to_snap->subpixel_position_offset();
-  } else {
-    cc::Layer* cc_layer = layer_to_snap->cc_layer();
-    origin = cc_layer->position();
-  }
-  CheckSnapped((layer_offset.x() + origin.x()) * scale_factor);
-  CheckSnapped((layer_offset.y() + origin.y()) * scale_factor);
-#endif
-}
-
-}  // namespace ui