ui/compositor/dip_util.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_COMPOSITOR_DIP_UTIL_H_
   6 #define UI_COMPOSITOR_DIP_UTIL_H_
   7
   8 #include "base/basictypes.h"
   9 #include "ui/compositor/compositor_export.h"
  10 #include "ui/gfx/geometry/point_f.h"
  11
  12 namespace gfx {
  13 class Point;
  14 class Size;
  15 class Rect;
  16 }  // namespace gfx
  17
  18 namespace ui {
  19 class Layer;
  20
  21 COMPOSITOR_EXPORT float GetDeviceScaleFactor(const Layer* layer);
  22
  23 // Utility functions that convert point/size/rect between
  24 // DIP and pixel coordinates system.
  25 COMPOSITOR_EXPORT gfx::Point ConvertPointToDIP(
  26     const Layer* layer,
  27     const gfx::Point& point_in_pixel);
  28 COMPOSITOR_EXPORT gfx::PointF ConvertPointToDIP(
  29     const Layer* layer,
  30     const gfx::PointF& point_in_pixel);
  31 COMPOSITOR_EXPORT gfx::Size ConvertSizeToDIP(
  32     const Layer* layer,
  33     const gfx::Size& size_in_pixel);
  34 COMPOSITOR_EXPORT gfx::Rect ConvertRectToDIP(
  35     const Layer* layer,
  36     const gfx::Rect& rect_in_pixel);
  37 COMPOSITOR_EXPORT gfx::Point ConvertPointToPixel(
  38     const Layer* layer,
  39     const gfx::Point& point_in_dip);
  40 COMPOSITOR_EXPORT gfx::Size ConvertSizeToPixel(
  41     const Layer* layer,
  42     const gfx::Size& size_in_dip);
  43 COMPOSITOR_EXPORT gfx::Rect ConvertRectToPixel(
  44     const Layer* layer,
  45     const gfx::Rect& rect_in_dip);
  46
  47 // Snaps the |layer_to_snap| to the physical pixel boundary.
  48 // |snapped_layer| is a reference layer that should also be
  49 // snapped at the pysical pixel boundary.
  50 COMPOSITOR_EXPORT void SnapLayerToPhysicalPixelBoundary(
  51     ui::Layer* snapped_layer,
  52     ui::Layer* layer_to_snap);
  53
  54 }  // namespace ui
  55
  56 #endif  // UI_COMPOSITOR_DIP_UTIL_H_