1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "base/logging.h" 6 #include "ui/gl/scoped_cgl.h" 7 8 namespace gfx { 9 ScopedCGLSetCurrentContext(CGLContextObj context)10ScopedCGLSetCurrentContext::ScopedCGLSetCurrentContext(CGLContextObj context) { 11 CGLContextObj previous_context = CGLGetCurrentContext(); 12 // It is possible for the previous context to have a zero reference count, 13 // because making a context current does not increment the reference count. 14 // In that case, do not restore the previous context. 15 if (previous_context && CGLGetContextRetainCount(previous_context)) { 16 previous_context_.reset(previous_context, base::scoped_policy::RETAIN); 17 } 18 CGLError error = CGLSetCurrentContext(context); 19 DCHECK_EQ(error, kCGLNoError) << "CGLSetCurrentContext should never fail"; 20 } 21 ~ScopedCGLSetCurrentContext()22ScopedCGLSetCurrentContext::~ScopedCGLSetCurrentContext() { 23 CGLError error = CGLSetCurrentContext(previous_context_); 24 DCHECK_EQ(error, kCGLNoError) << "CGLSetCurrentContext should never fail"; 25 } 26 27 } // namespace gfx 28