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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 "components/exo/wayland/wp_fractional_scale.h"
#include "base/memory/raw_ptr.h"
#include "components/exo/surface.h"
#include "components/exo/surface_observer.h"
#include "components/exo/wayland/server_util.h"
namespace exo::wayland {
namespace {
// A property key containing a boolean set to true if a fractional scale object
// is associated with with surface object.
DEFINE_UI_CLASS_PROPERTY_KEY(bool, kSurfaceHasFractionalScaleKey, false)
////////////////////////////////////////////////////////////////////////////////
// wp_fractional_scale_v1_interface:
// Implements the fractional scale interface to a Surface. The
// "fractional-scale"-state is set to null upon destruction. A window property
// will be set during the lifetime of this class to prevent multiple instances
// from being created for the same Surface.
class FractionalScale : public SurfaceObserver {
public:
explicit FractionalScale(Surface* surface, wl_resource* resource)
: surface_(surface), resource_(resource) {
surface_->AddSurfaceObserver(this);
surface_->SetProperty(kSurfaceHasFractionalScaleKey, true);
SendPreferredScale(0.0, surface_->GetDisplay().device_scale_factor());
}
FractionalScale(const FractionalScale&) = delete;
FractionalScale& operator=(const FractionalScale&) = delete;
~FractionalScale() override {
if (surface_) {
surface_->RemoveSurfaceObserver(this);
surface_->SetProperty(kSurfaceHasFractionalScaleKey, false);
}
}
void SendPreferredScale(float old_scale_factor, float new_scale_factor) {
uint32_t old_wire_scale = round(old_scale_factor * 120);
uint32_t new_wire_scale = round(new_scale_factor * 120);
DCHECK(new_wire_scale > 0);
if (new_wire_scale != old_wire_scale) {
wp_fractional_scale_v1_send_preferred_scale(resource_, new_wire_scale);
}
}
void OnScaleFactorChanged(Surface* surface,
float old_scale_factor,
float new_scale_factor) override {
SendPreferredScale(old_scale_factor, new_scale_factor);
}
void OnSurfaceDestroying(Surface* surface) override {
surface->RemoveSurfaceObserver(this);
surface_ = nullptr;
}
private:
raw_ptr<Surface> surface_;
const raw_ptr<wl_resource> resource_;
};
void wp_fractional_scale_destroy(struct wl_client* client,
struct wl_resource* resource) {
wl_resource_destroy(resource);
}
const struct wp_fractional_scale_v1_interface fractional_scale_implementation =
{
wp_fractional_scale_destroy,
};
////////////////////////////////////////////////////////////////////////////////
// wp_fractional_scale_manager_v1_interface:
void wp_fractional_scale_manager_destroy(struct wl_client* client,
struct wl_resource* resource) {
wl_resource_destroy(resource);
}
static void wp_fractional_scale_manager_get_fractional_scale(
wl_client* client,
wl_resource* resource,
uint32_t id,
wl_resource* surface_resource) {
Surface* surface = GetUserDataAs<Surface>(surface_resource);
if (surface->GetProperty(kSurfaceHasFractionalScaleKey)) {
wl_resource_post_error(
resource, WP_FRACTIONAL_SCALE_MANAGER_V1_ERROR_FRACTIONAL_SCALE_EXISTS,
"a fractional scale object for that surface already exists");
return;
}
wl_resource* fractional_scale_resource =
wl_resource_create(client, &wp_fractional_scale_v1_interface,
wl_resource_get_version(resource), id);
auto fractional_scale =
std::make_unique<FractionalScale>(surface, fractional_scale_resource);
SetImplementation(fractional_scale_resource, &fractional_scale_implementation,
std::move(fractional_scale));
}
static const struct wp_fractional_scale_manager_v1_interface
fractional_scale_manager_implementation = {
wp_fractional_scale_manager_destroy,
wp_fractional_scale_manager_get_fractional_scale,
};
} // namespace
void bind_fractional_scale_manager(wl_client* client,
void* data,
uint32_t version,
uint32_t id) {
wl_resource* resource =
wl_resource_create(client, &wp_fractional_scale_manager_v1_interface,
std::min(version, kFractionalScaleVersion), id);
wl_resource_set_implementation(
resource, &fractional_scale_manager_implementation, data, nullptr);
}
} // namespace exo::wayland
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