| // 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 "ui/gl/scoped_cgl.h" |
| |
| #include <ostream> |
| |
| #include "base/check_op.h" |
| |
| namespace gl { |
| |
| 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 gl |