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// Copyright 2014 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 "base/logging.h"
#include "ui/gl/scoped_cgl.h"
namespace gfx {
ScopedCGLSetCurrentContext::ScopedCGLSetCurrentContext(CGLContextObj context) {
CGLContextObj previous_context = CGLGetCurrentContext();
// It is possible for the previous context to have a zero reference count,
// because making a context current does not increment the reference count.
// In that case, do not restore the previous context.
if (previous_context && CGLGetContextRetainCount(previous_context)) {
previous_context_.reset(previous_context, base::scoped_policy::RETAIN);
}
CGLError error = CGLSetCurrentContext(context);
DCHECK_EQ(error, kCGLNoError) << "CGLSetCurrentContext should never fail";
}
ScopedCGLSetCurrentContext::~ScopedCGLSetCurrentContext() {
CGLError error = CGLSetCurrentContext(previous_context_);
DCHECK_EQ(error, kCGLNoError) << "CGLSetCurrentContext should never fail";
}
} // namespace gfx
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