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// Copyright 2017 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/views/animation/ink_drop_util.h"
#include <cmath>
#include "base/check_op.h"
#include "ui/gfx/geometry/point3_f.h"
#include "ui/gfx/geometry/vector2d_f.h"
#include "ui/gfx/transform.h"
#include "ui/native_theme/native_theme.h"
#include "ui/views/view.h"
#include "ui/views/views_features.h"
namespace views {
gfx::Transform GetTransformSubpixelCorrection(const gfx::Transform& transform,
float device_scale_factor) {
gfx::Point3F origin;
transform.TransformPoint(&origin);
const gfx::Vector2dF offset_in_dip = origin.AsPointF().OffsetFromOrigin();
// Scale the origin to screen space
origin.Scale(device_scale_factor);
// Compute the rounded offset in screen space and finally unscale it back to
// DIP space.
gfx::Vector2dF aligned_offset_in_dip = origin.AsPointF().OffsetFromOrigin();
aligned_offset_in_dip.set_x(std::round(aligned_offset_in_dip.x()));
aligned_offset_in_dip.set_y(std::round(aligned_offset_in_dip.y()));
aligned_offset_in_dip.Scale(1.f / device_scale_factor);
// Compute the subpixel offset correction and apply it to the transform.
gfx::Transform subpixel_correction;
subpixel_correction.Translate(aligned_offset_in_dip - offset_in_dip);
#if DCHECK_IS_ON()
const float kEpsilon = 0.0001f;
gfx::Point3F offset;
gfx::Transform transform_corrected(transform);
transform_corrected.ConcatTransform(subpixel_correction);
transform_corrected.TransformPoint(&offset);
offset.Scale(device_scale_factor);
if (!std::isnan(offset.x()))
DCHECK_LT(std::abs(std::round(offset.x()) - offset.x()), kEpsilon);
if (!std::isnan(offset.y()))
DCHECK_LT(std::abs(std::round(offset.y()) - offset.y()), kEpsilon);
#endif
return subpixel_correction;
}
bool UsingPlatformHighContrastInkDrop(const View* view) {
const ui::NativeTheme* theme = view->GetNativeTheme();
return theme &&
theme->GetDefaultSystemColorScheme() ==
ui::NativeTheme::ColorScheme::kPlatformHighContrast &&
base::FeatureList::IsEnabled(
features::kEnablePlatformHighContrastInkDrop);
}
} // namespace views
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