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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/base/cocoa/remote_layer_api.h"
#include "base/feature_list.h"
#include <objc/runtime.h>
namespace ui {
namespace {
// Control use of cross-process CALayers to display content directly from the
// GPU process on Mac.
BASE_FEATURE(kRemoteCoreAnimationAPI,
"RemoteCoreAnimationAPI",
base::FEATURE_ENABLED_BY_DEFAULT);
} // namespace
bool RemoteLayerAPISupported() {
if (!base::FeatureList::IsEnabled(kRemoteCoreAnimationAPI))
return false;
// Verify the GPU process interfaces are present.
static Class caContextClass = NSClassFromString(@"CAContext");
if (!caContextClass)
return false;
// Note that because the contextId and layer properties are dynamic,
// instancesRespondToSelector will return NO for them.
static bool caContextClassValid =
#if BUILDFLAG(IS_MAC)
[caContextClass
respondsToSelector:@selector(contextWithCGSConnection:options:)] &&
#else
[caContextClass
respondsToSelector:@selector(remoteContextWithOptions:)] &&
#endif
class_getProperty(caContextClass, "contextId") &&
class_getProperty(caContextClass, "layer");
if (!caContextClassValid)
return false;
// Verify the browser process interfaces are present.
static Class caLayerHostClass = NSClassFromString(@"CALayerHost");
if (!caLayerHostClass)
return false;
static bool caLayerHostClassValid =
[caLayerHostClass instancesRespondToSelector:@selector(contextId)] &&
[caLayerHostClass instancesRespondToSelector:@selector(setContextId:)];
if (!caLayerHostClassValid)
return false;
// If everything is there, we should be able to use the API.
return true;
}
} // namespace
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