| // 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/geometry/dip_util.h" |
| #include "ui/gfx/geometry/point.h" |
| #include "ui/gfx/geometry/point_conversions.h" |
| #include "ui/gfx/geometry/rect.h" |
| #include "ui/gfx/geometry/rect_conversions.h" |
| #include "ui/gfx/geometry/size.h" |
| #include "ui/gfx/geometry/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::ConvertPointToDIP(GetDeviceScaleFactor(layer), point_in_pixel); |
| } |
| |
| gfx::PointF ConvertPointToDIP(const Layer* layer, |
| const gfx::PointF& point_in_pixel) { |
| return gfx::ConvertPointToDIP(GetDeviceScaleFactor(layer), point_in_pixel); |
| } |
| |
| gfx::Size ConvertSizeToDIP(const Layer* layer, |
| const gfx::Size& size_in_pixel) { |
| return gfx::ConvertSizeToDIP(GetDeviceScaleFactor(layer), size_in_pixel); |
| } |
| |
| gfx::Rect ConvertRectToDIP(const Layer* layer, |
| const gfx::Rect& rect_in_pixel) { |
| return gfx::ConvertRectToDIP(GetDeviceScaleFactor(layer), rect_in_pixel); |
| } |
| |
| gfx::Point ConvertPointToPixel(const Layer* layer, |
| const gfx::Point& point_in_dip) { |
| return gfx::ConvertPointToPixel(GetDeviceScaleFactor(layer), point_in_dip); |
| } |
| |
| gfx::Size ConvertSizeToPixel(const Layer* layer, |
| const gfx::Size& size_in_dip) { |
| return gfx::ConvertSizeToPixel(GetDeviceScaleFactor(layer), size_in_dip); |
| } |
| |
| gfx::Rect ConvertRectToPixel(const Layer* layer, |
| const gfx::Rect& rect_in_dip) { |
| return gfx::ConvertRectToPixel(GetDeviceScaleFactor(layer), rect_in_dip); |
| } |
| |
| #if DCHECK_IS_ON() |
| namespace { |
| |
| void CheckSnapped(float snapped_position) { |
| // The acceptable error epsilon should be small enough to detect visible |
| // artifacts as well as large enough to not cause false crashes when an |
| // uncommon device scale factor is applied. |
| const float kEplison = 0.003f; |
| 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::PointF view_offset(layer_to_snap->GetTargetBounds().origin()); |
| ui::Layer::ConvertPointToLayer(layer_to_snap->parent(), snapped_layer, |
| &view_offset); |
| |
| float scale_factor = GetDeviceScaleFactor(layer_to_snap); |
| view_offset.Scale(scale_factor); |
| gfx::PointF view_offset_snapped(gfx::ToRoundedPoint(view_offset)); |
| |
| gfx::Vector2dF fudge = view_offset_snapped - view_offset; |
| fudge.Scale(1.0 / scale_factor); |
| |
| // Apply any scale originating from transforms to the fudge. |
| gfx::Transform transform; |
| layer_to_snap->parent()->GetTargetTransformRelativeTo(snapped_layer, |
| &transform); |
| gfx::Vector2dF transform_scale = transform.Scale2d(); |
| fudge.Scale(1.0 / transform_scale.x(), 1.0 / transform_scale.y()); |
| |
| layer_to_snap->SetSubpixelPositionOffset(fudge); |
| #if DCHECK_IS_ON() |
| gfx::PointF layer_offset; |
| gfx::PointF origin; |
| Layer::ConvertPointToLayer( |
| layer_to_snap->parent(), snapped_layer, &layer_offset); |
| if (layer_to_snap->GetAnimator()->is_animating()) { |
| origin = gfx::PointF(layer_to_snap->GetTargetBounds().origin()) + |
| layer_to_snap->subpixel_position_offset(); |
| } else { |
| origin = layer_to_snap->position(); |
| } |
| origin.Scale(transform_scale.x(), transform_scale.y()); |
| CheckSnapped((layer_offset.x() + origin.x()) * scale_factor); |
| CheckSnapped((layer_offset.y() + origin.y()) * scale_factor); |
| #endif |
| } |
| |
| } // namespace ui |