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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/wm/raster_scale/raster_scale_controller.h"
#include "ash/public/cpp/window_properties.h"
#include "ash/shell.h"
#include "ui/aura/client/aura_constants.h"
namespace ash {
ScopedSetRasterScale::ScopedSetRasterScale(aura::Window* window,
float raster_scale)
: window_(window), raster_scale_(raster_scale) {
window_->AddObserver(this);
Shell::Get()->raster_scale_controller()->PushRasterScale(window_,
raster_scale_);
}
ScopedSetRasterScale::~ScopedSetRasterScale() {
Shutdown();
}
void ScopedSetRasterScale::UpdateScale(float raster_scale) {
if (window_) {
auto* controller = Shell::Get()->raster_scale_controller();
controller->PushRasterScale(window_, raster_scale);
controller->PopRasterScale(window_, raster_scale_);
}
raster_scale_ = raster_scale;
}
// static
void ScopedSetRasterScale::SetOrUpdateRasterScale(
aura::Window* window,
float raster_scale,
std::unique_ptr<ScopedSetRasterScale>* p) {
if (*p) {
DCHECK_EQ(window, (*p)->window_);
(*p)->UpdateScale(raster_scale);
} else {
*p = std::make_unique<ScopedSetRasterScale>(window, raster_scale);
}
}
void ScopedSetRasterScale::Shutdown() {
if (window_) {
Shell::Get()->raster_scale_controller()->PopRasterScale(window_,
raster_scale_);
window_->RemoveObserver(this);
window_ = nullptr;
}
}
void ScopedSetRasterScale::OnWindowDestroying(aura::Window* window) {
DCHECK_EQ(window_, window);
Shutdown();
}
ScopedPauseRasterScaleUpdates::ScopedPauseRasterScaleUpdates() {
Shell::Get()->raster_scale_controller()->Pause();
}
ScopedPauseRasterScaleUpdates::~ScopedPauseRasterScaleUpdates() {
Shell::Get()->raster_scale_controller()->Unpause();
}
RasterScaleController::RasterScaleController() = default;
RasterScaleController::~RasterScaleController() = default;
float RasterScaleController::RasterScaleFromTransform(
const gfx::Transform& transform) {
const auto scale_2d = transform.To2dScale();
return std::max(scale_2d.x(), scale_2d.y());
}
void RasterScaleController::PushRasterScale(aura::Window* window,
float raster_scale) {
if (!windows_observation_.IsObservingSource(window)) {
windows_observation_.AddObservation(window);
}
window_scales_[window].push_back(raster_scale);
MaybeSetRasterScale(window);
}
void RasterScaleController::PopRasterScale(aura::Window* window,
float raster_scale) {
auto iter = window_scales_.find(window);
// This may happen if the window has been destroyed.
if (iter == window_scales_.end()) {
return;
}
auto& scales = iter->second;
DCHECK(base::Contains(scales, raster_scale));
auto scale_iter = std::find(scales.begin(), scales.end(), raster_scale);
if (scale_iter != scales.end()) {
scales.erase(scale_iter);
}
MaybeSetRasterScale(window);
if (scales.empty()) {
window_scales_.erase(window);
// If we still hold a reference to this window, we need to keep observing
// it.
if (!pending_windows_.contains(window)) {
windows_observation_.RemoveObservation(window);
}
}
}
float RasterScaleController::ComputeRasterScaleForWindow(aura::Window* window) {
auto iter = window_scales_.find(window);
if (iter == window_scales_.end() || iter->second.empty()) {
return 1.0f;
}
float raster_scale = 0.0;
for (auto scale : iter->second) {
raster_scale = std::max(raster_scale, scale);
}
return std::max(raster_scale, kMinimumRasterScale);
}
void RasterScaleController::OnWindowDestroying(aura::Window* window) {
windows_observation_.RemoveObservation(window);
window_scales_.erase(window);
pending_windows_.erase(window);
}
void RasterScaleController::MaybeSetRasterScale(aura::Window* window) {
if (pause_count_ > 0) {
pending_windows_.insert(window);
return;
}
const float previous_scale = window->GetProperty(aura::client::kRasterScale);
const float current_scale = ComputeRasterScaleForWindow(window);
// Allow updating the raster scale if the relative change is at least the slop
// proportion.
const bool slop_condition =
previous_scale != 0.0 &&
std::abs((previous_scale - current_scale) / previous_scale) >=
raster_scale_slop_proportion_;
if (previous_scale != current_scale &&
(slop_condition || current_scale == 1.0f)) {
window->SetProperty(aura::client::kRasterScale, current_scale);
}
}
void RasterScaleController::Pause() {
pause_count_++;
}
void RasterScaleController::Unpause() {
pause_count_--;
DCHECK_GE(pause_count_, 0);
if (pause_count_ == 0) {
for (auto* window : pending_windows_) {
MaybeSetRasterScale(window);
// If we kept observing a window since it had a pending change, we can
// stop observing now if there is no scale set.
if (!window_scales_.contains(window)) {
windows_observation_.RemoveObservation(window);
}
}
pending_windows_.clear();
}
}
} // namespace ash
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