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// Copyright (c) 2011 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/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
#import <AppKit/AppKit.h>
#include "base/logging.h"
#include "base/mac/mac_util.h"
namespace gfx {
ScopedNSGraphicsContextSaveGState::ScopedNSGraphicsContextSaveGState()
: context_([NSGraphicsContext currentContext]) {
[NSGraphicsContext saveGraphicsState];
}
ScopedNSGraphicsContextSaveGState::~ScopedNSGraphicsContextSaveGState() {
[NSGraphicsContext restoreGraphicsState];
if (!context_ && base::mac::IsOSLeopardOrEarlier()) {
// On 10.5 and earlier, there is a bug. If the current graphics context was
// nil when +[NSGraphicsContext saveGraphicsState] was called, then calling
// +[NSGraphicsContext restoreGraphicsState] will not restore a nil current
// context, but will leave the current context in place. Because allowing
// that stale context (which will be deallocated soon) to remain current
// will only lead to heartache and pain, the current context must be
// manually nilled out.
[NSGraphicsContext setCurrentContext:nil];
}
DCHECK_EQ(context_, [NSGraphicsContext currentContext]);
}
} // namespace gfx
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