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// Copyright 2019 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_viewporter.h"
#include <viewporter-server-protocol.h>
#include <memory>
#include "base/memory/raw_ptr.h"
#include "components/exo/surface_observer.h"
#include "components/exo/wayland/server_util.h"
#include "ui/gfx/geometry/size_f.h"
namespace exo {
namespace wayland {
namespace {
// A property key containing a boolean set to true if a viewport is associated
// with with surface object.
DEFINE_UI_CLASS_PROPERTY_KEY(bool, kSurfaceHasViewportKey, false)
////////////////////////////////////////////////////////////////////////////////
// wp_viewport_interface:
// Implements the viewport interface to a Surface. The "viewport"-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 Viewport : public SurfaceObserver {
public:
explicit Viewport(Surface* surface) : surface_(surface) {
surface_->AddSurfaceObserver(this);
surface_->SetProperty(kSurfaceHasViewportKey, true);
}
Viewport(const Viewport&) = delete;
Viewport& operator=(const Viewport&) = delete;
~Viewport() override {
if (surface_) {
surface_->RemoveSurfaceObserver(this);
surface_->SetCrop(gfx::RectF());
surface_->SetViewport(gfx::SizeF());
surface_->SetProperty(kSurfaceHasViewportKey, false);
}
}
void SetSource(const gfx::RectF& rect) {
if (surface_)
surface_->SetCrop(rect);
}
void SetDestination(const gfx::Size& size) {
if (surface_)
surface_->SetViewport(gfx::SizeF(size));
}
// Overridden from SurfaceObserver:
void OnSurfaceDestroying(Surface* surface) override {
surface->RemoveSurfaceObserver(this);
surface_ = nullptr;
}
private:
raw_ptr<Surface> surface_;
};
void viewport_destroy(wl_client* client, wl_resource* resource) {
wl_resource_destroy(resource);
}
void viewport_set_source(wl_client* client,
wl_resource* resource,
wl_fixed_t x,
wl_fixed_t y,
wl_fixed_t width,
wl_fixed_t height) {
if (x == wl_fixed_from_int(-1) && y == wl_fixed_from_int(-1) &&
width == wl_fixed_from_int(-1) && height == wl_fixed_from_int(-1)) {
GetUserDataAs<Viewport>(resource)->SetSource(gfx::RectF());
return;
}
if (x < 0 || y < 0 || width <= 0 || height <= 0) {
wl_resource_post_error(resource, WP_VIEWPORT_ERROR_BAD_VALUE,
"source rectangle must be non-empty (%dx%d) and"
"have positive origin (%d,%d)",
width, height, x, y);
return;
}
GetUserDataAs<Viewport>(resource)->SetSource(
gfx::RectF(wl_fixed_to_double(x), wl_fixed_to_double(y),
wl_fixed_to_double(width), wl_fixed_to_double(height)));
}
void viewport_set_destination(wl_client* client,
wl_resource* resource,
int32_t width,
int32_t height) {
if (width == -1 && height == -1) {
GetUserDataAs<Viewport>(resource)->SetDestination(gfx::Size());
return;
}
if (width <= 0 || height <= 0) {
wl_resource_post_error(resource, WP_VIEWPORT_ERROR_BAD_VALUE,
"destination size must be positive (%dx%d)", width,
height);
return;
}
GetUserDataAs<Viewport>(resource)->SetDestination(gfx::Size(width, height));
}
const struct wp_viewport_interface viewport_implementation = {
viewport_destroy, viewport_set_source, viewport_set_destination};
////////////////////////////////////////////////////////////////////////////////
// wp_viewporter_interface:
void viewporter_destroy(wl_client* client, wl_resource* resource) {
wl_resource_destroy(resource);
}
void viewporter_get_viewport(wl_client* client,
wl_resource* resource,
uint32_t id,
wl_resource* surface_resource) {
Surface* surface = GetUserDataAs<Surface>(surface_resource);
if (surface->GetProperty(kSurfaceHasViewportKey)) {
wl_resource_post_error(resource, WP_VIEWPORTER_ERROR_VIEWPORT_EXISTS,
"a viewport for that surface already exists");
return;
}
wl_resource* viewport_resource = wl_resource_create(
client, &wp_viewport_interface, wl_resource_get_version(resource), id);
SetImplementation(viewport_resource, &viewport_implementation,
std::make_unique<Viewport>(surface));
}
const struct wp_viewporter_interface viewporter_implementation = {
viewporter_destroy, viewporter_get_viewport};
} // namespace
void bind_viewporter(wl_client* client,
void* data,
uint32_t version,
uint32_t id) {
wl_resource* resource =
wl_resource_create(client, &wp_viewporter_interface, 1, id);
wl_resource_set_implementation(resource, &viewporter_implementation, data,
nullptr);
}
} // namespace wayland
} // namespace exo
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