| // 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" |
| |
| 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 !defined(NDEBUG) |
| namespace { |
| |
| void CheckSnapped(float snapped_position) { |
| const float kEplison = 0.0001f; |
| float diff = std::abs(snapped_position - static_cast<int>(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 !defined(NDEBUG) |
| gfx::Point p; |
| Layer::ConvertPointToLayer(layer_to_snap->parent(), snapped_layer, &p); |
| cc::Layer* cc_layer = layer_to_snap->cc_layer(); |
| gfx::PointF origin = cc_layer->position(); |
| CheckSnapped((p.x() + origin.x()) * scale_factor); |
| CheckSnapped((p.y() + origin.y()) * scale_factor); |
| #endif |
| } |
| |
| } // namespace ui |