ui/gl/scoped_cgl.cc

   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
  10 ScopedCGLSetCurrentContext::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
  22 ScopedCGLSetCurrentContext::~ScopedCGLSetCurrentContext() {
  23   CGLError error = CGLSetCurrentContext(previous_context_);
  24   DCHECK_EQ(error, kCGLNoError) << "CGLSetCurrentContext should never fail";
  25 }
  26
  27 }  // namespace gfx