macOS: Move QMacCGContext helper into QtGui

The implementation was duplicated and spread out between QMacStyle,
QMacPaintEngine, and the Cocoa platform plugin.

Moving it into QtGui allows using it on other Apple platform.

Change-Id: Iadcbd71998204887e116271c575037789b6e2163
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>

1 files changed, 99 insertions, 0 deletions

diff --git a/src/gui/painting/qcoregraphics_p.h b/src/gui/painting/qcoregraphics_p.h
new file mode 100644
index 0000000000..b6ea5474ec
--- /dev/null
+++ b/src/gui/painting/qcoregraphics_p.h
@@ -0,0 +1,99 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QCOREGRAPHICS_P_H
+#define QCOREGRAPHICS_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtGui/private/qtguiglobal_p.h>
+#include <QtGui/qregion.h>
+
+#include <CoreGraphics/CoreGraphics.h>
+
+QT_BEGIN_NAMESPACE
+
+Q_GUI_EXPORT CGColorSpaceRef qt_mac_genericColorSpace();
+Q_GUI_EXPORT CGColorSpaceRef qt_mac_colorSpaceForDeviceType(const QPaintDevice *paintDevice);
+
+Q_GUI_EXPORT void qt_mac_clip_cg(CGContextRef hd, const QRegion &rgn, CGAffineTransform *orig_xform);
+
+class Q_GUI_EXPORT QMacCGContext
+{
+public:
+    inline QMacCGContext() { context = 0; }
+    QMacCGContext(QPaintDevice *pdev);
+    QMacCGContext(QPainter *p);
+    inline QMacCGContext(CGContextRef cg, bool takeOwnership = false) {
+        context = cg;
+        if (!takeOwnership)
+            CGContextRetain(context);
+    }
+    inline QMacCGContext(const QMacCGContext &copy) : context(0) { *this = copy; }
+    inline ~QMacCGContext() {
+        if (context)
+            CGContextRelease(context);
+    }
+    inline bool isNull() const { return context; }
+    inline operator CGContextRef() { return context; }
+    inline QMacCGContext &operator=(const QMacCGContext &copy) {
+        if (context)
+            CGContextRelease(context);
+        context = copy.context;
+        CGContextRetain(context);
+        return *this;
+    }
+    inline QMacCGContext &operator=(CGContextRef cg) {
+        if (context)
+            CGContextRelease(context);
+        context = cg;
+        CGContextRetain(context); //we do not take ownership
+        return *this;
+    }
+
+private:
+    CGContextRef context;
+};
+
+QT_END_NAMESPACE
+
+#endif // QCOREGRAPHICS_P_H